From d9389b4eb864ff4426ea09232b44b365ba1407c7 Mon Sep 17 00:00:00 2001
From: Alexander Heldt <me@alexanderheldt.se>
Date: Wed, 31 Jul 2024 11:57:35 +0200
Subject: [PATCH] Configure system clock to run at 96Mhz

---
 build/final.elf     |  Bin 48108 -> 49840 bytes
 build/final.elf.map |  262 ++++-----
 build/main.S        | 1264 ++++++++++++++++++++++++++++++-------------
 build/main.i        |  146 ++++-
 build/main.o        |  Bin 45212 -> 47756 bytes
 src/flash.h         |    1 -
 src/main.c          |   68 +++
 src/pwr.h           |   22 +
 src/rcc.h           |   16 +-
 9 files changed, 1252 insertions(+), 527 deletions(-)
 create mode 100644 src/pwr.h

diff --git a/build/final.elf b/build/final.elf
index b09d64636b2bfad852f1a1d4c6e86d38fa74364a..40a2191924ffe6be03801548097ea2bc3143d238 100755
GIT binary patch
delta 5845
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delta 4046
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diff --git a/build/final.elf.map b/build/final.elf.map
index 6d411a5..8e44d1b 100644
--- a/build/final.elf.map
+++ b/build/final.elf.map
@@ -33,6 +33,8 @@ Discarded input sections
  .group         0x00000000        0xc build/main.o
  .group         0x00000000        0xc build/main.o
  .group         0x00000000        0xc build/main.o
+ .group         0x00000000        0xc build/main.o
+ .group         0x00000000        0xc build/main.o
  .text          0x00000000        0x0 build/main.o
  .data          0x00000000        0x0 build/main.o
  .bss           0x00000000        0x0 build/main.o
@@ -86,7 +88,7 @@ LOAD build/startup.o
                 0x08000000                interrupt_vector_table
                 0x08000198                        . = ALIGN (0x4)
 
-.text           0x08000198      0x1a8
+.text           0x08000198      0x2f4
                 0x08000198                        . = ALIGN (0x4)
  *(.text)
  *(.text.*)
@@ -96,108 +98,112 @@ LOAD build/startup.o
  .text.gpio_write
                 0x080001fa       0x4c build/gpio.o
                 0x080001fa                gpio_write
- .text.spin     0x08000246       0x22 build/main.o
- .text.main     0x08000268       0x5c build/main.o
-                0x08000268                main
+ *fill*         0x08000246        0x2 
+ .text.system_clock_init
+                0x08000248      0x144 build/main.o
+ .text.spin     0x0800038c       0x22 build/main.o
+ *fill*         0x080003ae        0x2 
+ .text.main     0x080003b0       0x60 build/main.o
+                0x080003b0                main
  .text.init_memory
-                0x080002c4       0x64 build/startup.o
-                0x080002c4                init_memory
- .text.reset    0x08000328       0x10 build/startup.o
-                0x08000328                reset
+                0x08000410       0x64 build/startup.o
+                0x08000410                init_memory
+ .text.reset    0x08000474       0x10 build/startup.o
+                0x08000474                reset
  .text.default_handler
-                0x08000338        0x8 build/startup.o
-                0x08000338                exti0
-                0x08000338                debug_monitor
-                0x08000338                rcc
-                0x08000338                x
-                0x08000338                sdio
-                0x08000338                usage_fault
-                0x08000338                tim1_up_tim10
-                0x08000338                usart1
-                0x08000338                i2c3_er
-                0x08000338                spi2
-                0x08000338                dma1_stream1
-                0x08000338                bus_fault
-                0x08000338                spi5
-                0x08000338                exti3
-                0x08000338                dma2_stream5
-                0x08000338                tim2
-                0x08000338                dma1_stream6
-                0x08000338                default_handler
-                0x08000338                i2c1_er
-                0x08000338                hard_fault
-                0x08000338                usart6
-                0x08000338                exti15_10
-                0x08000338                usart2
-                0x08000338                pend_sv
-                0x08000338                i2c1_ev
-                0x08000338                wwdg
-                0x08000338                adc
-                0x08000338                rtc_alarm
-                0x08000338                spi3
-                0x08000338                exti1
-                0x08000338                mem_manage
-                0x08000338                dma2_stream1
-                0x08000338                dma1_stream2
-                0x08000338                dma2_stream3
-                0x08000338                sv_call
-                0x08000338                tim3
-                0x08000338                otg_fs
-                0x08000338                dma1_stream5
-                0x08000338                dma2_stream6
-                0x08000338                flash
-                0x08000338                tamp_stamp
-                0x08000338                i2c3_ev
-                0x08000338                rtc_wkup
-                0x08000338                dma2_stream0
-                0x08000338                pvd
-                0x08000338                fpu
-                0x08000338                exti4
-                0x08000338                exti2
-                0x08000338                spi1
-                0x08000338                dma1_stream0
-                0x08000338                tim1_brk_tim9
-                0x08000338                i2c2_ev
-                0x08000338                otg_fs_wkup
-                0x08000338                spi4
-                0x08000338                dma2_stream2
-                0x08000338                tim1_cc
-                0x08000338                tim1_trg_com_tim11
-                0x08000338                exti9_5
-                0x08000338                dma1_stream3
-                0x08000338                dma2_stream4
-                0x08000338                i2c2_er
-                0x08000338                dma2_stream7
-                0x08000338                dma1_stream7
-                0x08000338                nmi
-                0x08000338                systick
-                0x08000338                tim4
-                0x08000338                tim5
-                0x08000338                dma1_stream4
+                0x08000484        0x8 build/startup.o
+                0x08000484                exti0
+                0x08000484                debug_monitor
+                0x08000484                rcc
+                0x08000484                x
+                0x08000484                sdio
+                0x08000484                usage_fault
+                0x08000484                tim1_up_tim10
+                0x08000484                usart1
+                0x08000484                i2c3_er
+                0x08000484                spi2
+                0x08000484                dma1_stream1
+                0x08000484                bus_fault
+                0x08000484                spi5
+                0x08000484                exti3
+                0x08000484                dma2_stream5
+                0x08000484                tim2
+                0x08000484                dma1_stream6
+                0x08000484                default_handler
+                0x08000484                i2c1_er
+                0x08000484                hard_fault
+                0x08000484                usart6
+                0x08000484                exti15_10
+                0x08000484                usart2
+                0x08000484                pend_sv
+                0x08000484                i2c1_ev
+                0x08000484                wwdg
+                0x08000484                adc
+                0x08000484                rtc_alarm
+                0x08000484                spi3
+                0x08000484                exti1
+                0x08000484                mem_manage
+                0x08000484                dma2_stream1
+                0x08000484                dma1_stream2
+                0x08000484                dma2_stream3
+                0x08000484                sv_call
+                0x08000484                tim3
+                0x08000484                otg_fs
+                0x08000484                dma1_stream5
+                0x08000484                dma2_stream6
+                0x08000484                flash
+                0x08000484                tamp_stamp
+                0x08000484                i2c3_ev
+                0x08000484                rtc_wkup
+                0x08000484                dma2_stream0
+                0x08000484                pvd
+                0x08000484                fpu
+                0x08000484                exti4
+                0x08000484                exti2
+                0x08000484                spi1
+                0x08000484                dma1_stream0
+                0x08000484                tim1_brk_tim9
+                0x08000484                i2c2_ev
+                0x08000484                otg_fs_wkup
+                0x08000484                spi4
+                0x08000484                dma2_stream2
+                0x08000484                tim1_cc
+                0x08000484                tim1_trg_com_tim11
+                0x08000484                exti9_5
+                0x08000484                dma1_stream3
+                0x08000484                dma2_stream4
+                0x08000484                i2c2_er
+                0x08000484                dma2_stream7
+                0x08000484                dma1_stream7
+                0x08000484                nmi
+                0x08000484                systick
+                0x08000484                tim4
+                0x08000484                tim5
+                0x08000484                dma1_stream4
  *(.rodata)
  *(.rodata.*)
-                0x08000340                        . = ALIGN (0x4)
-                0x08000340                        _data_addr = LOADADDR (.data)
+                0x0800048c                        . = ALIGN (0x4)
+                0x0800048c                        _data_addr = LOADADDR (.data)
 
-.glue_7         0x08000340        0x0
- .glue_7        0x08000340        0x0 linker stubs
+.glue_7         0x0800048c        0x0
+ .glue_7        0x0800048c        0x0 linker stubs
 
-.glue_7t        0x08000340        0x0
- .glue_7t       0x08000340        0x0 linker stubs
+.glue_7t        0x0800048c        0x0
+ .glue_7t       0x0800048c        0x0 linker stubs
 
-.vfp11_veneer   0x08000340        0x0
- .vfp11_veneer  0x08000340        0x0 linker stubs
+.vfp11_veneer   0x0800048c        0x0
+ .vfp11_veneer  0x0800048c        0x0 linker stubs
 
-.v4_bx          0x08000340        0x0
- .v4_bx         0x08000340        0x0 linker stubs
+.v4_bx          0x0800048c        0x0
+ .v4_bx         0x0800048c        0x0 linker stubs
 
-.iplt           0x08000340        0x0
- .iplt          0x08000340        0x0 build/main.o
+.iplt           0x0800048c        0x0
+ .iplt          0x0800048c        0x0 build/main.o
 
-.rel.dyn        0x08000340        0x0
- .rel.iplt      0x08000340        0x0 build/main.o
+.rel.dyn        0x0800048c        0x0
+ .rel.iplt      0x0800048c        0x0 build/main.o
 
-.data           0x20000000        0x0 load address 0x08000340
+.data           0x20000000        0x0 load address 0x0800048c
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _data_start = .
  *(.data)
@@ -205,10 +211,10 @@ LOAD build/startup.o
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _data_end = .
 
-.igot.plt       0x20000000        0x0 load address 0x08000340
+.igot.plt       0x20000000        0x0 load address 0x0800048c
  .igot.plt      0x20000000        0x0 build/main.o
 
-.bss            0x20000000        0x0 load address 0x08000340
+.bss            0x20000000        0x0 load address 0x0800048c
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _bss_start = .
  *(.bss)
@@ -218,34 +224,34 @@ LOAD build/startup.o
 OUTPUT(build/final.elf elf32-littlearm)
 LOAD linker stubs
 
-.debug_info     0x00000000      0x64e
+.debug_info     0x00000000      0x6f5
  .debug_info    0x00000000      0x21a build/gpio.o
- .debug_info    0x0000021a      0x2ac build/main.o
- .debug_info    0x000004c6      0x188 build/startup.o
+ .debug_info    0x0000021a      0x353 build/main.o
+ .debug_info    0x0000056d      0x188 build/startup.o
 
-.debug_abbrev   0x00000000      0x36d
+.debug_abbrev   0x00000000      0x397
  .debug_abbrev  0x00000000      0x12b build/gpio.o
- .debug_abbrev  0x0000012b      0x11b build/main.o
- .debug_abbrev  0x00000246      0x127 build/startup.o
+ .debug_abbrev  0x0000012b      0x145 build/main.o
+ .debug_abbrev  0x00000270      0x127 build/startup.o
 
-.debug_aranges  0x00000000       0x80
+.debug_aranges  0x00000000       0x88
  .debug_aranges
                 0x00000000       0x28 build/gpio.o
  .debug_aranges
-                0x00000028       0x28 build/main.o
+                0x00000028       0x30 build/main.o
  .debug_aranges
-                0x00000050       0x30 build/startup.o
+                0x00000058       0x30 build/startup.o
 
 .debug_rnglists
-                0x00000000       0x51
+                0x00000000       0x58
  .debug_rnglists
                 0x00000000       0x19 build/gpio.o
  .debug_rnglists
-                0x00000019       0x19 build/main.o
+                0x00000019       0x20 build/main.o
  .debug_rnglists
-                0x00000032       0x1f build/startup.o
+                0x00000039       0x1f build/startup.o
 
-.debug_macro    0x00000000     0x2e91
+.debug_macro    0x00000000     0x2f1d
  .debug_macro   0x00000000      0xb56 build/gpio.o
  .debug_macro   0x00000b56       0x22 build/gpio.o
  .debug_macro   0x00000b78       0x75 build/gpio.o
@@ -261,24 +267,26 @@ LOAD linker stubs
  .debug_macro   0x00001115      0x4cc build/gpio.o
  .debug_macro   0x000015e1       0x22 build/gpio.o
  .debug_macro   0x00001603       0x34 build/gpio.o
- .debug_macro   0x00001637      0xb6b build/main.o
- .debug_macro   0x000021a2      0x118 build/main.o
- .debug_macro   0x000022ba       0x2e build/main.o
- .debug_macro   0x000022e8      0xb02 build/startup.o
- .debug_macro   0x00002dea       0x56 build/startup.o
- .debug_macro   0x00002e40       0x51 build/startup.o
+ .debug_macro   0x00001637      0xb7d build/main.o
+ .debug_macro   0x000021b4      0x11e build/main.o
+ .debug_macro   0x000022d2       0x2e build/main.o
+ .debug_macro   0x00002300       0x46 build/main.o
+ .debug_macro   0x00002346       0x2e build/main.o
+ .debug_macro   0x00002374      0xb02 build/startup.o
+ .debug_macro   0x00002e76       0x56 build/startup.o
+ .debug_macro   0x00002ecc       0x51 build/startup.o
 
-.debug_line     0x00000000      0x2fe
+.debug_line     0x00000000      0x3ee
  .debug_line    0x00000000      0x116 build/gpio.o
- .debug_line    0x00000116       0xfe build/main.o
- .debug_line    0x00000214       0xea build/startup.o
+ .debug_line    0x00000116      0x1ee build/main.o
+ .debug_line    0x00000304       0xea build/startup.o
 
-.debug_str      0x00000000     0x5ada
+.debug_str      0x00000000     0x5d86
  .debug_str     0x00000000     0x5372 build/gpio.o
                                0x551a (size before relaxing)
- .debug_str     0x00005372      0x6e0 build/main.o
-                               0x5ba5 (size before relaxing)
- .debug_str     0x00005a52       0x88 build/startup.o
+ .debug_str     0x00005372      0x98c build/main.o
+                               0x5e56 (size before relaxing)
+ .debug_str     0x00005cfe       0x88 build/startup.o
                                0x3cdf (size before relaxing)
 
 .comment        0x00000000       0x45
@@ -297,18 +305,18 @@ LOAD linker stubs
                 0x00000068       0x34 build/startup.o
 
 .debug_line_str
-                0x00000000      0x265
+                0x00000000      0x273
  .debug_line_str
                 0x00000000      0x24e build/gpio.o
                                 0x260 (size before relaxing)
  .debug_line_str
-                0x0000024e        0xd build/main.o
-                                0x266 (size before relaxing)
+                0x0000024e       0x1b build/main.o
+                                0x274 (size before relaxing)
  .debug_line_str
-                0x0000025b        0xa build/startup.o
+                0x00000269        0xa build/startup.o
                                 0x21b (size before relaxing)
 
-.debug_frame    0x00000000      0x124
+.debug_frame    0x00000000      0x144
  .debug_frame   0x00000000       0x60 build/gpio.o
- .debug_frame   0x00000060       0x58 build/main.o
- .debug_frame   0x000000b8       0x6c build/startup.o
+ .debug_frame   0x00000060       0x78 build/main.o
+ .debug_frame   0x000000d8       0x6c build/startup.o
diff --git a/build/main.S b/build/main.S
index 4a25ba7..6c86b0f 100644
--- a/build/main.S
+++ b/build/main.S
@@ -17,6 +17,225 @@
 .Ltext0:
 	.cfi_sections	.debug_frame
 	.file 1 "src/main.c"
+	.section	.text.system_clock_init,"ax",%progbits
+	.align	1
+	.syntax unified
+	.thumb
+	.thumb_func
+	.type	system_clock_init, %function
+system_clock_init:
+.LFB0:
+	.loc 1 9 37
+	.cfi_startproc
+	@ args = 0, pretend = 0, frame = 0
+	@ frame_needed = 1, uses_anonymous_args = 0
+	@ link register save eliminated.
+	push	{r7}
+	.cfi_def_cfa_offset 4
+	.cfi_offset 7, -4
+	add	r7, sp, #0
+	.cfi_def_cfa_register 7
+	.loc 1 11 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #64]
+	ldr	r2, .L5
+	.loc 1 11 43
+	orr	r3, r3, #268435456
+	str	r3, [r2, #64]
+	.loc 1 14 33
+	ldr	r3, .L5+4
+	ldr	r3, [r3]
+	ldr	r2, .L5+4
+	.loc 1 14 38
+	bic	r3, r3, #49152
+	str	r3, [r2]
+	.loc 1 15 33
+	ldr	r3, .L5+4
+	ldr	r3, [r3]
+	ldr	r2, .L5+4
+	.loc 1 15 38
+	orr	r3, r3, #49152
+	str	r3, [r2]
+	.loc 1 18 33
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	ldr	r2, .L5
+	.loc 1 18 38
+	orr	r3, r3, #65536
+	str	r3, [r2]
+	.loc 1 22 9
+	nop
+.L2:
+	.loc 1 22 42 discriminator 1
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	.loc 1 22 47 discriminator 1
+	and	r3, r3, #131072
+	.loc 1 22 10 discriminator 1
+	cmp	r3, #0
+	beq	.L2
+	.loc 1 26 33
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	ldr	r2, .L5
+	.loc 1 26 38
+	bic	r3, r3, #16777216
+	str	r3, [r2]
+	.loc 1 29 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #4]
+	ldr	r2, .L5
+	.loc 1 29 43
+	orr	r3, r3, #4194304
+	str	r3, [r2, #4]
+	.loc 1 32 33
+	ldr	r3, .L5
+	ldr	r2, [r3, #4]
+	ldr	r1, .L5
+	.loc 1 32 43
+	ldr	r3, .L5+8
+	orrs	r3, r3, r2
+	str	r3, [r1, #4]
+	.loc 1 35 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 35 40
+	bic	r3, r3, #240
+	str	r3, [r2, #8]
+	.loc 1 36 33
+	ldr	r3, .L5
+	ldr	r2, .L5
+	ldr	r3, [r3, #8]
+	.loc 1 36 40
+	str	r3, [r2, #8]
+	.loc 1 39 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 39 40
+	bic	r3, r3, #7168
+	str	r3, [r2, #8]
+	.loc 1 40 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 40 40
+	orr	r3, r3, #4096
+	str	r3, [r2, #8]
+	.loc 1 43 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 43 40
+	bic	r3, r3, #57344
+	str	r3, [r2, #8]
+	.loc 1 44 33
+	ldr	r3, .L5
+	ldr	r2, .L5
+	ldr	r3, [r3, #8]
+	.loc 1 44 40
+	str	r3, [r2, #8]
+	.loc 1 47 33
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	ldr	r2, .L5
+	.loc 1 47 38
+	orr	r3, r3, #16777216
+	str	r3, [r2]
+	.loc 1 51 9
+	nop
+.L3:
+	.loc 1 51 42 discriminator 1
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	.loc 1 51 47 discriminator 1
+	and	r3, r3, #131072
+	.loc 1 51 10 discriminator 1
+	cmp	r3, #0
+	beq	.L3
+	.loc 1 54 35
+	ldr	r3, .L5+12
+	ldr	r3, [r3]
+	ldr	r2, .L5+12
+	.loc 1 54 41
+	orr	r3, r3, #1024
+	str	r3, [r2]
+	.loc 1 55 35
+	ldr	r3, .L5+12
+	ldr	r3, [r3]
+	ldr	r2, .L5+12
+	.loc 1 55 41
+	orr	r3, r3, #512
+	str	r3, [r2]
+	.loc 1 58 35
+	ldr	r3, .L5+12
+	ldr	r3, [r3]
+	ldr	r2, .L5+12
+	.loc 1 58 41
+	bic	r3, r3, #15
+	str	r3, [r2]
+	.loc 1 59 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 59 40
+	orr	r3, r3, #272
+	orr	r3, r3, #1
+	str	r3, [r2, #8]
+	.loc 1 62 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 62 40
+	bic	r3, r3, #3
+	str	r3, [r2, #8]
+	.loc 1 63 33
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	ldr	r2, .L5
+	.loc 1 63 40
+	orr	r3, r3, #2
+	str	r3, [r2, #8]
+	.loc 1 67 9
+	nop
+.L4:
+	.loc 1 67 42 discriminator 1
+	ldr	r3, .L5
+	ldr	r3, [r3, #8]
+	.loc 1 67 49 discriminator 1
+	lsrs	r3, r3, #2
+	.loc 1 67 55 discriminator 1
+	and	r3, r3, #3
+	.loc 1 67 65 discriminator 1
+	cmp	r3, #2
+	bne	.L4
+	.loc 1 70 33
+	ldr	r3, .L5
+	ldr	r3, [r3]
+	ldr	r2, .L5
+	.loc 1 70 38
+	bic	r3, r3, #1
+	str	r3, [r2]
+	.loc 1 71 1
+	nop
+	mov	sp, r7
+	.cfi_def_cfa_register 13
+	@ sp needed
+	ldr	r7, [sp], #4
+	.cfi_restore 7
+	.cfi_def_cfa_offset 0
+	bx	lr
+.L6:
+	.align	2
+.L5:
+	.word	1073887232
+	.word	1073770496
+	.word	67252505
+	.word	1073888256
+	.cfi_endproc
+.LFE0:
+	.size	system_clock_init, .-system_clock_init
 	.section	.text.spin,"ax",%progbits
 	.align	1
 	.syntax unified
@@ -24,8 +243,8 @@
 	.thumb_func
 	.type	spin, %function
 spin:
-.LFB0:
-	.loc 1 7 50
+.LFB1:
+	.loc 1 73 50
 	.cfi_startproc
 	@ args = 0, pretend = 0, frame = 8
 	@ frame_needed = 1, uses_anonymous_args = 0
@@ -38,17 +257,17 @@ spin:
 	add	r7, sp, #0
 	.cfi_def_cfa_register 7
 	str	r0, [r7, #4]
-	.loc 1 8 9
+	.loc 1 74 9
 	nop
-.L2:
-	.loc 1 8 15 discriminator 1
+.L8:
+	.loc 1 74 15 discriminator 1
 	ldr	r3, [r7, #4]
 	subs	r2, r3, #1
 	str	r2, [r7, #4]
-	.loc 1 8 10 discriminator 1
+	.loc 1 74 10 discriminator 1
 	cmp	r3, #0
-	bne	.L2
-	.loc 1 9 1
+	bne	.L8
+	.loc 1 75 1
 	nop
 	nop
 	adds	r7, r7, #12
@@ -61,7 +280,7 @@ spin:
 	.cfi_def_cfa_offset 0
 	bx	lr
 	.cfi_endproc
-.LFE0:
+.LFE1:
 	.size	spin, .-spin
 	.section	.text.main,"ax",%progbits
 	.align	1
@@ -71,8 +290,8 @@ spin:
 	.thumb_func
 	.type	main, %function
 main:
-.LFB1:
-	.loc 1 11 16
+.LFB2:
+	.loc 1 77 16
 	.cfi_startproc
 	@ args = 0, pretend = 0, frame = 8
 	@ frame_needed = 1, uses_anonymous_args = 0
@@ -84,58 +303,60 @@ main:
 	.cfi_def_cfa_offset 16
 	add	r7, sp, #0
 	.cfi_def_cfa_register 7
-	.loc 1 12 12
+	.loc 1 78 3
+	bl	system_clock_init
+	.loc 1 80 12
 	movw	r3, #525
 	strh	r3, [r7, #6]	@ movhi
-	.loc 1 13 33
-	ldr	r3, .L5
+	.loc 1 81 33
+	ldr	r3, .L11
 	ldr	r3, [r3, #48]
-	.loc 1 13 57
+	.loc 1 81 57
 	ldrh	r2, [r7, #6]
 	lsrs	r2, r2, #8
 	uxth	r2, r2
 	mov	r1, r2
-	.loc 1 13 49
+	.loc 1 81 49
 	movs	r2, #1
 	lsls	r2, r2, r1
 	mov	r1, r2
-	.loc 1 13 33
-	ldr	r2, .L5
-	.loc 1 13 43
+	.loc 1 81 33
+	ldr	r2, .L11
+	.loc 1 81 43
 	orrs	r3, r3, r1
 	str	r3, [r2, #48]
-	.loc 1 14 3
+	.loc 1 82 3
 	ldrh	r3, [r7, #6]
 	movs	r1, #1
 	mov	r0, r3
 	bl	gpio_set_mode
-.L4:
-	.loc 1 16 5 discriminator 1
+.L10:
+	.loc 1 84 5 discriminator 1
 	ldrh	r3, [r7, #6]
 	movs	r1, #1
 	mov	r0, r3
 	bl	gpio_write
-	.loc 1 17 5 discriminator 1
-	ldr	r0, .L5+4
+	.loc 1 85 5 discriminator 1
+	ldr	r0, .L11+4
 	bl	spin
-	.loc 1 18 5 discriminator 1
+	.loc 1 86 5 discriminator 1
 	ldrh	r3, [r7, #6]
 	movs	r1, #0
 	mov	r0, r3
 	bl	gpio_write
-	.loc 1 19 5 discriminator 1
-	ldr	r0, .L5+4
+	.loc 1 87 5 discriminator 1
+	ldr	r0, .L11+4
 	bl	spin
-	.loc 1 16 5 discriminator 1
+	.loc 1 84 5 discriminator 1
 	nop
-	b	.L4
-.L6:
+	b	.L10
+.L12:
 	.align	2
-.L5:
+.L11:
 	.word	1073887232
 	.word	999999
 	.cfi_endproc
-.LFE1:
+.LFE2:
 	.size	main, .-main
 	.text
 .Letext0:
@@ -143,18 +364,20 @@ main:
 	.file 3 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/_stdint.h"
 	.file 4 "src/rcc.h"
 	.file 5 "src/gpio.h"
+	.file 6 "src/flash.h"
+	.file 7 "src/pwr.h"
 	.section	.debug_info,"",%progbits
 .Ldebug_info0:
-	.4byte	0x2a8
+	.4byte	0x34f
 	.2byte	0x5
 	.byte	0x1
 	.byte	0x4
 	.4byte	.Ldebug_abbrev0
-	.uleb128 0x9
-	.4byte	.LASF956
+	.uleb128 0xa
+	.4byte	.LASF979
 	.byte	0x1d
-	.4byte	.LASF957
-	.4byte	.LASF958
+	.4byte	.LASF980
+	.4byte	.LASF981
 	.4byte	.LLRL0
 	.4byte	0
 	.4byte	.Ldebug_line0
@@ -162,17 +385,17 @@ main:
 	.uleb128 0x2
 	.byte	0x1
 	.byte	0x6
-	.4byte	.LASF910
+	.4byte	.LASF929
 	.uleb128 0x2
 	.byte	0x1
 	.byte	0x8
-	.4byte	.LASF911
+	.4byte	.LASF930
 	.uleb128 0x2
 	.byte	0x2
 	.byte	0x5
-	.4byte	.LASF912
-	.uleb128 0x3
-	.4byte	.LASF915
+	.4byte	.LASF931
+	.uleb128 0x4
+	.4byte	.LASF934
 	.byte	0x2
 	.byte	0x39
 	.byte	0x1c
@@ -180,13 +403,13 @@ main:
 	.uleb128 0x2
 	.byte	0x2
 	.byte	0x7
-	.4byte	.LASF913
+	.4byte	.LASF932
 	.uleb128 0x2
 	.byte	0x4
 	.byte	0x5
-	.4byte	.LASF914
-	.uleb128 0x3
-	.4byte	.LASF916
+	.4byte	.LASF933
+	.uleb128 0x4
+	.4byte	.LASF935
 	.byte	0x2
 	.byte	0x4f
 	.byte	0x1b
@@ -194,194 +417,220 @@ main:
 	.uleb128 0x2
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF917
+	.4byte	.LASF936
 	.uleb128 0x2
 	.byte	0x8
 	.byte	0x5
-	.4byte	.LASF918
+	.4byte	.LASF937
 	.uleb128 0x2
 	.byte	0x8
 	.byte	0x7
-	.4byte	.LASF919
-	.uleb128 0xa
+	.4byte	.LASF938
+	.uleb128 0xb
 	.byte	0x4
 	.byte	0x5
 	.ascii	"int\000"
 	.uleb128 0x2
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF920
-	.uleb128 0x3
-	.4byte	.LASF921
+	.4byte	.LASF939
+	.uleb128 0x4
+	.4byte	.LASF940
 	.byte	0x3
 	.byte	0x24
 	.byte	0x14
 	.4byte	0x3f
-	.uleb128 0x3
-	.4byte	.LASF922
+	.uleb128 0x4
+	.4byte	.LASF941
 	.byte	0x3
 	.byte	0x30
 	.byte	0x14
 	.4byte	0x59
 	.uleb128 0x7
 	.4byte	0x94
-	.uleb128 0xb
+	.uleb128 0x8
 	.ascii	"rcc\000"
 	.byte	0x8c
 	.byte	0x4
-	.byte	0x6
-	.byte	0x8
-	.4byte	0x1e6
-	.uleb128 0x6
+	.4byte	0x200
+	.uleb128 0x3
 	.ascii	"CR\000"
+	.byte	0x4
 	.byte	0x7
 	.4byte	0xa0
 	.byte	0
 	.uleb128 0x1
-	.4byte	.LASF923
+	.4byte	.LASF942
+	.byte	0x4
 	.byte	0x8
 	.4byte	0xa0
 	.byte	0x4
 	.uleb128 0x1
-	.4byte	.LASF924
+	.4byte	.LASF943
+	.byte	0x4
 	.byte	0x9
 	.4byte	0xa0
 	.byte	0x8
-	.uleb128 0x6
+	.uleb128 0x3
 	.ascii	"CIR\000"
+	.byte	0x4
 	.byte	0xa
 	.4byte	0xa0
 	.byte	0xc
 	.uleb128 0x1
-	.4byte	.LASF925
+	.4byte	.LASF944
+	.byte	0x4
 	.byte	0xb
 	.4byte	0xa0
 	.byte	0x10
 	.uleb128 0x1
-	.4byte	.LASF926
+	.4byte	.LASF945
+	.byte	0x4
 	.byte	0xc
 	.4byte	0xa0
 	.byte	0x14
 	.uleb128 0x1
-	.4byte	.LASF927
+	.4byte	.LASF946
+	.byte	0x4
 	.byte	0xd
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x18
 	.uleb128 0x1
-	.4byte	.LASF928
+	.4byte	.LASF947
+	.byte	0x4
 	.byte	0xe
 	.4byte	0xa0
 	.byte	0x20
 	.uleb128 0x1
-	.4byte	.LASF929
+	.4byte	.LASF948
+	.byte	0x4
 	.byte	0xf
 	.4byte	0xa0
 	.byte	0x24
 	.uleb128 0x1
-	.4byte	.LASF930
+	.4byte	.LASF949
+	.byte	0x4
 	.byte	0x10
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x28
 	.uleb128 0x1
-	.4byte	.LASF931
+	.4byte	.LASF950
+	.byte	0x4
 	.byte	0x11
 	.4byte	0xa0
 	.byte	0x30
 	.uleb128 0x1
-	.4byte	.LASF932
+	.4byte	.LASF951
+	.byte	0x4
 	.byte	0x12
 	.4byte	0xa0
 	.byte	0x34
 	.uleb128 0x1
-	.4byte	.LASF933
+	.4byte	.LASF952
+	.byte	0x4
 	.byte	0x13
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x38
 	.uleb128 0x1
-	.4byte	.LASF934
+	.4byte	.LASF953
+	.byte	0x4
 	.byte	0x14
 	.4byte	0xa0
 	.byte	0x40
 	.uleb128 0x1
-	.4byte	.LASF935
+	.4byte	.LASF954
+	.byte	0x4
 	.byte	0x15
 	.4byte	0xa0
 	.byte	0x44
 	.uleb128 0x1
-	.4byte	.LASF936
+	.4byte	.LASF955
+	.byte	0x4
 	.byte	0x16
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x48
 	.uleb128 0x1
-	.4byte	.LASF937
+	.4byte	.LASF956
+	.byte	0x4
 	.byte	0x17
 	.4byte	0xa0
 	.byte	0x50
 	.uleb128 0x1
-	.4byte	.LASF938
+	.4byte	.LASF957
+	.byte	0x4
 	.byte	0x18
 	.4byte	0xa0
 	.byte	0x54
 	.uleb128 0x1
-	.4byte	.LASF939
+	.4byte	.LASF958
+	.byte	0x4
 	.byte	0x19
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x58
 	.uleb128 0x1
-	.4byte	.LASF940
+	.4byte	.LASF959
+	.byte	0x4
 	.byte	0x1a
 	.4byte	0xa0
 	.byte	0x60
 	.uleb128 0x1
-	.4byte	.LASF941
+	.4byte	.LASF960
+	.byte	0x4
 	.byte	0x1b
 	.4byte	0xa0
 	.byte	0x64
 	.uleb128 0x1
-	.4byte	.LASF942
+	.4byte	.LASF961
+	.byte	0x4
 	.byte	0x1c
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x68
 	.uleb128 0x1
-	.4byte	.LASF943
+	.4byte	.LASF962
+	.byte	0x4
 	.byte	0x1d
 	.4byte	0xa0
 	.byte	0x70
-	.uleb128 0x6
+	.uleb128 0x3
 	.ascii	"CSR\000"
+	.byte	0x4
 	.byte	0x1e
 	.4byte	0xa0
 	.byte	0x74
 	.uleb128 0x1
-	.4byte	.LASF944
+	.4byte	.LASF963
+	.byte	0x4
 	.byte	0x1f
-	.4byte	0x1f6
+	.4byte	0x210
 	.byte	0x78
 	.uleb128 0x1
-	.4byte	.LASF945
+	.4byte	.LASF964
+	.byte	0x4
 	.byte	0x20
 	.4byte	0xa0
 	.byte	0x80
 	.uleb128 0x1
-	.4byte	.LASF946
+	.4byte	.LASF965
+	.byte	0x4
 	.byte	0x21
 	.4byte	0xa0
 	.byte	0x84
 	.uleb128 0x1
-	.4byte	.LASF947
+	.4byte	.LASF966
+	.byte	0x4
 	.byte	0x22
 	.4byte	0xa0
 	.byte	0x88
 	.byte	0
 	.uleb128 0xc
 	.4byte	0xa0
-	.4byte	0x1f6
+	.4byte	0x210
 	.uleb128 0xd
 	.4byte	0x81
 	.byte	0x1
 	.byte	0
 	.uleb128 0x7
-	.4byte	0x1e6
+	.4byte	0x200
 	.uleb128 0xe
 	.byte	0x7
 	.byte	0x1
@@ -389,88 +638,160 @@ main:
 	.byte	0x5
 	.byte	0x20
 	.byte	0xe
-	.4byte	0x222
-	.uleb128 0x4
-	.4byte	.LASF948
+	.4byte	0x23c
+	.uleb128 0x5
+	.4byte	.LASF967
 	.byte	0
-	.uleb128 0x4
-	.4byte	.LASF949
+	.uleb128 0x5
+	.4byte	.LASF968
 	.byte	0x1
-	.uleb128 0x4
-	.4byte	.LASF950
+	.uleb128 0x5
+	.4byte	.LASF969
 	.byte	0x2
-	.uleb128 0x4
-	.4byte	.LASF951
+	.uleb128 0x5
+	.4byte	.LASF970
 	.byte	0x3
 	.byte	0
-	.uleb128 0x3
-	.4byte	.LASF952
+	.uleb128 0x4
+	.4byte	.LASF971
 	.byte	0x5
 	.byte	0x25
 	.byte	0x3
-	.4byte	0x1fb
+	.4byte	0x215
+	.uleb128 0xf
+	.4byte	.LASF972
+	.byte	0x18
+	.byte	0x6
+	.byte	0x6
+	.byte	0x8
+	.4byte	0x29c
+	.uleb128 0x3
+	.ascii	"ACR\000"
+	.byte	0x6
+	.byte	0x7
+	.4byte	0xa0
+	.byte	0
+	.uleb128 0x1
+	.4byte	.LASF973
+	.byte	0x6
+	.byte	0x8
+	.4byte	0xa0
+	.byte	0x4
+	.uleb128 0x1
+	.4byte	.LASF974
+	.byte	0x6
+	.byte	0x9
+	.4byte	0xa0
+	.byte	0x8
+	.uleb128 0x3
+	.ascii	"SR\000"
+	.byte	0x6
+	.byte	0xa
+	.4byte	0xa0
+	.byte	0xc
+	.uleb128 0x3
+	.ascii	"CR\000"
+	.byte	0x6
+	.byte	0xb
+	.4byte	0xa0
+	.byte	0x10
+	.uleb128 0x1
+	.4byte	.LASF975
+	.byte	0x6
+	.byte	0xc
+	.4byte	0xa0
+	.byte	0x14
+	.byte	0
 	.uleb128 0x8
-	.4byte	.LASF954
+	.ascii	"pwr\000"
+	.byte	0x8
+	.byte	0x7
+	.4byte	0x2bf
+	.uleb128 0x3
+	.ascii	"CR\000"
+	.byte	0x7
+	.byte	0x7
+	.4byte	0xa0
+	.byte	0
+	.uleb128 0x3
+	.ascii	"CSR\000"
+	.byte	0x7
+	.byte	0x8
+	.4byte	0xa0
+	.byte	0x4
+	.byte	0
+	.uleb128 0x9
+	.4byte	.LASF977
 	.byte	0x28
-	.4byte	0x243
-	.uleb128 0x5
+	.4byte	0x2d4
+	.uleb128 0x6
 	.4byte	0x88
-	.uleb128 0x5
-	.4byte	0x243
+	.uleb128 0x6
+	.4byte	0x2d4
 	.byte	0
 	.uleb128 0x2
 	.byte	0x1
 	.byte	0x2
-	.4byte	.LASF953
-	.uleb128 0x8
-	.4byte	.LASF955
+	.4byte	.LASF976
+	.uleb128 0x9
+	.4byte	.LASF978
 	.byte	0x27
-	.4byte	0x25f
-	.uleb128 0x5
+	.4byte	0x2f0
+	.uleb128 0x6
 	.4byte	0x88
-	.uleb128 0x5
-	.4byte	0x222
+	.uleb128 0x6
+	.4byte	0x23c
 	.byte	0
-	.uleb128 0xf
-	.4byte	.LASF959
+	.uleb128 0x10
+	.4byte	.LASF982
 	.byte	0x1
-	.byte	0xb
+	.byte	0x4d
 	.byte	0x5
 	.4byte	0x7a
-	.4byte	.LFB1
-	.4byte	.LFE1-.LFB1
+	.4byte	.LFB2
+	.4byte	.LFE2-.LFB2
 	.uleb128 0x1
 	.byte	0x9c
-	.4byte	0x289
-	.uleb128 0x10
+	.4byte	0x31a
+	.uleb128 0x11
 	.ascii	"led\000"
 	.byte	0x1
-	.byte	0xc
+	.byte	0x50
 	.byte	0xc
 	.4byte	0x88
 	.uleb128 0x2
 	.byte	0x91
 	.sleb128 -10
 	.byte	0
-	.uleb128 0x11
-	.4byte	.LASF960
+	.uleb128 0x12
+	.4byte	.LASF983
 	.byte	0x1
-	.byte	0x7
+	.byte	0x49
 	.byte	0x14
-	.4byte	.LFB0
-	.4byte	.LFE0-.LFB0
+	.4byte	.LFB1
+	.4byte	.LFE1-.LFB1
 	.uleb128 0x1
 	.byte	0x9c
-	.uleb128 0x12
-	.4byte	.LASF961
+	.4byte	0x340
+	.uleb128 0x13
+	.4byte	.LASF984
 	.byte	0x1
-	.byte	0x7
+	.byte	0x49
 	.byte	0x2b
 	.4byte	0xa0
 	.uleb128 0x2
 	.byte	0x91
 	.sleb128 -12
 	.byte	0
+	.uleb128 0x14
+	.4byte	.LASF985
+	.byte	0x1
+	.byte	0x9
+	.byte	0xd
+	.4byte	.LFB0
+	.4byte	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
 	.byte	0
 	.section	.debug_abbrev,"",%progbits
 .Ldebug_abbrev0:
@@ -480,8 +801,7 @@ main:
 	.uleb128 0x3
 	.uleb128 0xe
 	.uleb128 0x3a
-	.uleb128 0x21
-	.sleb128 4
+	.uleb128 0xb
 	.uleb128 0x3b
 	.uleb128 0xb
 	.uleb128 0x39
@@ -505,6 +825,24 @@ main:
 	.byte	0
 	.byte	0
 	.uleb128 0x3
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0x21
+	.sleb128 21
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x4
 	.uleb128 0x16
 	.byte	0
 	.uleb128 0x3
@@ -519,7 +857,7 @@ main:
 	.uleb128 0x13
 	.byte	0
 	.byte	0
-	.uleb128 0x4
+	.uleb128 0x5
 	.uleb128 0x28
 	.byte	0
 	.uleb128 0x3
@@ -528,30 +866,11 @@ main:
 	.uleb128 0xb
 	.byte	0
 	.byte	0
-	.uleb128 0x5
-	.uleb128 0x5
-	.byte	0
-	.uleb128 0x49
-	.uleb128 0x13
-	.byte	0
-	.byte	0
 	.uleb128 0x6
-	.uleb128 0xd
+	.uleb128 0x5
 	.byte	0
-	.uleb128 0x3
-	.uleb128 0x8
-	.uleb128 0x3a
-	.uleb128 0x21
-	.sleb128 4
-	.uleb128 0x3b
-	.uleb128 0xb
-	.uleb128 0x39
-	.uleb128 0x21
-	.sleb128 21
 	.uleb128 0x49
 	.uleb128 0x13
-	.uleb128 0x38
-	.uleb128 0xb
 	.byte	0
 	.byte	0
 	.uleb128 0x7
@@ -562,6 +881,25 @@ main:
 	.byte	0
 	.byte	0
 	.uleb128 0x8
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0x21
+	.sleb128 6
+	.uleb128 0x39
+	.uleb128 0x21
+	.sleb128 8
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
 	.uleb128 0x2e
 	.byte	0x1
 	.uleb128 0x3f
@@ -584,7 +922,7 @@ main:
 	.uleb128 0x13
 	.byte	0
 	.byte	0
-	.uleb128 0x9
+	.uleb128 0xa
 	.uleb128 0x11
 	.byte	0x1
 	.uleb128 0x25
@@ -605,7 +943,7 @@ main:
 	.uleb128 0x17
 	.byte	0
 	.byte	0
-	.uleb128 0xa
+	.uleb128 0xb
 	.uleb128 0x24
 	.byte	0
 	.uleb128 0xb
@@ -616,23 +954,6 @@ main:
 	.uleb128 0x8
 	.byte	0
 	.byte	0
-	.uleb128 0xb
-	.uleb128 0x13
-	.byte	0x1
-	.uleb128 0x3
-	.uleb128 0x8
-	.uleb128 0xb
-	.uleb128 0xb
-	.uleb128 0x3a
-	.uleb128 0xb
-	.uleb128 0x3b
-	.uleb128 0xb
-	.uleb128 0x39
-	.uleb128 0xb
-	.uleb128 0x1
-	.uleb128 0x13
-	.byte	0
-	.byte	0
 	.uleb128 0xc
 	.uleb128 0x1
 	.byte	0x1
@@ -671,6 +992,23 @@ main:
 	.byte	0
 	.byte	0
 	.uleb128 0xf
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x10
 	.uleb128 0x2e
 	.byte	0x1
 	.uleb128 0x3f
@@ -699,7 +1037,7 @@ main:
 	.uleb128 0x13
 	.byte	0
 	.byte	0
-	.uleb128 0x10
+	.uleb128 0x11
 	.uleb128 0x34
 	.byte	0
 	.uleb128 0x3
@@ -716,7 +1054,7 @@ main:
 	.uleb128 0x18
 	.byte	0
 	.byte	0
-	.uleb128 0x11
+	.uleb128 0x12
 	.uleb128 0x2e
 	.byte	0x1
 	.uleb128 0x3
@@ -737,9 +1075,11 @@ main:
 	.uleb128 0x18
 	.uleb128 0x7a
 	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
 	.byte	0
 	.byte	0
-	.uleb128 0x12
+	.uleb128 0x13
 	.uleb128 0x5
 	.byte	0
 	.uleb128 0x3
@@ -756,9 +1096,32 @@ main:
 	.uleb128 0x18
 	.byte	0
 	.byte	0
+	.uleb128 0x14
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x7a
+	.uleb128 0x19
+	.byte	0
+	.byte	0
 	.byte	0
 	.section	.debug_aranges,"",%progbits
-	.4byte	0x24
+	.4byte	0x2c
 	.2byte	0x2
 	.4byte	.Ldebug_info0
 	.byte	0x4
@@ -769,6 +1132,8 @@ main:
 	.4byte	.LFE0-.LFB0
 	.4byte	.LFB1
 	.4byte	.LFE1-.LFB1
+	.4byte	.LFB2
+	.4byte	.LFE2-.LFB2
 	.4byte	0
 	.4byte	0
 	.section	.debug_rnglists,"",%progbits
@@ -786,6 +1151,9 @@ main:
 	.byte	0x7
 	.4byte	.LFB1
 	.uleb128 .LFE1-.LFB1
+	.byte	0x7
+	.4byte	.LFB2
+	.uleb128 .LFE2-.LFB2
 	.byte	0
 .Ldebug_ranges3:
 	.section	.debug_macro,"",%progbits
@@ -2158,76 +2526,76 @@ main:
 	.byte	0x5
 	.uleb128 0
 	.4byte	.LASF453
-	.file 6 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/inttypes.h"
+	.file 8 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/inttypes.h"
 	.byte	0x3
 	.uleb128 0x1
-	.uleb128 0x6
+	.uleb128 0x8
 	.byte	0x5
 	.uleb128 0xe
 	.4byte	.LASF454
-	.file 7 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/newlib.h"
+	.file 9 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/newlib.h"
 	.byte	0x3
 	.uleb128 0x10
-	.uleb128 0x7
+	.uleb128 0x9
 	.byte	0x5
 	.uleb128 0x7
 	.4byte	.LASF455
-	.file 8 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/_newlib_version.h"
+	.file 10 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/_newlib_version.h"
 	.byte	0x3
 	.uleb128 0xa
-	.uleb128 0x8
+	.uleb128 0xa
 	.byte	0x7
 	.4byte	.Ldebug_macro2
 	.byte	0x4
 	.byte	0x7
 	.4byte	.Ldebug_macro3
 	.byte	0x4
-	.file 9 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/config.h"
+	.file 11 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/config.h"
 	.byte	0x3
 	.uleb128 0x11
-	.uleb128 0x9
+	.uleb128 0xb
 	.byte	0x5
 	.uleb128 0x2
 	.4byte	.LASF478
-	.file 10 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/machine/ieeefp.h"
+	.file 12 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/machine/ieeefp.h"
 	.byte	0x3
 	.uleb128 0x4
-	.uleb128 0xa
+	.uleb128 0xc
 	.byte	0x7
 	.4byte	.Ldebug_macro4
 	.byte	0x4
-	.file 11 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/features.h"
+	.file 13 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/features.h"
 	.byte	0x3
 	.uleb128 0x5
-	.uleb128 0xb
+	.uleb128 0xd
 	.byte	0x7
 	.4byte	.Ldebug_macro5
 	.byte	0x4
 	.byte	0x7
 	.4byte	.Ldebug_macro6
 	.byte	0x4
-	.file 12 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/_intsup.h"
+	.file 14 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/sys/_intsup.h"
 	.byte	0x3
 	.uleb128 0x12
-	.uleb128 0xc
+	.uleb128 0xe
 	.byte	0x7
 	.4byte	.Ldebug_macro7
 	.byte	0x4
-	.file 13 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/_ansi.h"
+	.file 15 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/_ansi.h"
 	.byte	0x3
 	.uleb128 0x13
-	.uleb128 0xd
+	.uleb128 0xf
 	.byte	0x7
 	.4byte	.Ldebug_macro8
 	.byte	0x4
-	.file 14 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stdint.h"
+	.file 16 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stdint.h"
 	.byte	0x3
 	.uleb128 0x14
-	.uleb128 0xe
-	.file 15 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/stdint.h"
+	.uleb128 0x10
+	.file 17 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/arm-none-eabi/include/stdint.h"
 	.byte	0x3
 	.uleb128 0x9
-	.uleb128 0xf
+	.uleb128 0x11
 	.byte	0x5
 	.uleb128 0xa
 	.4byte	.LASF546
@@ -2253,10 +2621,10 @@ main:
 	.byte	0x5
 	.uleb128 0x15
 	.4byte	.LASF647
-	.file 16 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stddef.h"
+	.file 18 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stddef.h"
 	.byte	0x3
 	.uleb128 0x16
-	.uleb128 0x10
+	.uleb128 0x12
 	.byte	0x7
 	.4byte	.Ldebug_macro12
 	.byte	0x4
@@ -2274,20 +2642,32 @@ main:
 	.uleb128 0x5
 	.byte	0x5
 	.uleb128 0x2
-	.4byte	.LASF896
-	.file 17 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stdbool.h"
+	.4byte	.LASF897
+	.file 19 "/nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/lib/gcc/arm-none-eabi/12.3.1/include/stdbool.h"
 	.byte	0x3
 	.uleb128 0x4
-	.uleb128 0x11
+	.uleb128 0x13
 	.byte	0x7
 	.4byte	.Ldebug_macro15
 	.byte	0x4
 	.byte	0x7
 	.4byte	.Ldebug_macro16
 	.byte	0x4
-	.byte	0x5
+	.byte	0x3
+	.uleb128 0x4
+	.uleb128 0x6
+	.byte	0x7
+	.4byte	.Ldebug_macro17
+	.byte	0x4
+	.byte	0x3
 	.uleb128 0x5
-	.4byte	.LASF909
+	.uleb128 0x7
+	.byte	0x7
+	.4byte	.Ldebug_macro18
+	.byte	0x4
+	.byte	0x5
+	.uleb128 0x7
+	.4byte	.LASF928
 	.byte	0x4
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4._newlib_version.h.4.6d111ab2e95434b664b53815e5c8ccba,comdat
@@ -3547,7 +3927,7 @@ main:
 	.uleb128 0x135
 	.4byte	.LASF849
 	.byte	0
-	.section	.debug_macro,"G",%progbits,wm4.rcc.h.2.a0fe590d50a4a87e3e0cde8c35fecccb,comdat
+	.section	.debug_macro,"G",%progbits,wm4.rcc.h.2.f63dea3638ca6807414aa0ffe92775a0,comdat
 .Ldebug_macro14:
 	.2byte	0x5
 	.byte	0
@@ -3573,122 +3953,125 @@ main:
 	.uleb128 0x2f
 	.4byte	.LASF856
 	.byte	0x5
-	.uleb128 0x30
+	.uleb128 0x32
 	.4byte	.LASF857
 	.byte	0x5
 	.uleb128 0x33
 	.4byte	.LASF858
 	.byte	0x5
-	.uleb128 0x34
+	.uleb128 0x36
 	.4byte	.LASF859
 	.byte	0x5
 	.uleb128 0x37
 	.4byte	.LASF860
 	.byte	0x5
-	.uleb128 0x38
+	.uleb128 0x3a
 	.4byte	.LASF861
 	.byte	0x5
 	.uleb128 0x3b
 	.4byte	.LASF862
 	.byte	0x5
-	.uleb128 0x3c
+	.uleb128 0x3e
 	.4byte	.LASF863
 	.byte	0x5
-	.uleb128 0x3e
+	.uleb128 0x3f
 	.4byte	.LASF864
 	.byte	0x5
-	.uleb128 0x3f
+	.uleb128 0x42
 	.4byte	.LASF865
 	.byte	0x5
-	.uleb128 0x42
+	.uleb128 0x43
 	.4byte	.LASF866
 	.byte	0x5
-	.uleb128 0x43
+	.uleb128 0x44
 	.4byte	.LASF867
 	.byte	0x5
-	.uleb128 0x44
+	.uleb128 0x46
 	.4byte	.LASF868
 	.byte	0x5
-	.uleb128 0x46
+	.uleb128 0x47
 	.4byte	.LASF869
 	.byte	0x5
-	.uleb128 0x47
+	.uleb128 0x49
 	.4byte	.LASF870
 	.byte	0x5
-	.uleb128 0x49
+	.uleb128 0x4a
 	.4byte	.LASF871
 	.byte	0x5
-	.uleb128 0x4a
+	.uleb128 0x4b
 	.4byte	.LASF872
 	.byte	0x5
-	.uleb128 0x4b
+	.uleb128 0x4d
 	.4byte	.LASF873
 	.byte	0x5
-	.uleb128 0x4d
+	.uleb128 0x4e
 	.4byte	.LASF874
 	.byte	0x5
-	.uleb128 0x4e
+	.uleb128 0x4f
 	.4byte	.LASF875
 	.byte	0x5
-	.uleb128 0x4f
+	.uleb128 0x51
 	.4byte	.LASF876
 	.byte	0x5
-	.uleb128 0x51
+	.uleb128 0x52
 	.4byte	.LASF877
 	.byte	0x5
-	.uleb128 0x52
+	.uleb128 0x53
 	.4byte	.LASF878
 	.byte	0x5
-	.uleb128 0x53
+	.uleb128 0x57
 	.4byte	.LASF879
 	.byte	0x5
-	.uleb128 0x57
+	.uleb128 0x58
 	.4byte	.LASF880
 	.byte	0x5
-	.uleb128 0x58
+	.uleb128 0x5b
 	.4byte	.LASF881
 	.byte	0x5
-	.uleb128 0x5b
+	.uleb128 0x5c
 	.4byte	.LASF882
 	.byte	0x5
-	.uleb128 0x5c
+	.uleb128 0x5f
 	.4byte	.LASF883
 	.byte	0x5
-	.uleb128 0x5f
+	.uleb128 0x60
 	.4byte	.LASF884
 	.byte	0x5
-	.uleb128 0x60
+	.uleb128 0x63
 	.4byte	.LASF885
 	.byte	0x5
-	.uleb128 0x63
+	.uleb128 0x65
 	.4byte	.LASF886
 	.byte	0x5
-	.uleb128 0x65
+	.uleb128 0x66
 	.4byte	.LASF887
 	.byte	0x5
-	.uleb128 0x66
+	.uleb128 0x69
 	.4byte	.LASF888
 	.byte	0x5
-	.uleb128 0x69
+	.uleb128 0x6b
 	.4byte	.LASF889
 	.byte	0x5
-	.uleb128 0x6b
+	.uleb128 0x6c
 	.4byte	.LASF890
 	.byte	0x5
-	.uleb128 0x6c
+	.uleb128 0x6f
 	.4byte	.LASF891
 	.byte	0x5
-	.uleb128 0x6f
+	.uleb128 0x71
 	.4byte	.LASF892
 	.byte	0x5
-	.uleb128 0x71
+	.uleb128 0x72
 	.4byte	.LASF893
 	.byte	0x5
-	.uleb128 0x72
+	.uleb128 0x73
 	.4byte	.LASF894
 	.byte	0x5
-	.uleb128 0x73
+	.uleb128 0x76
 	.4byte	.LASF895
+	.byte	0x5
+	.uleb128 0x77
+	.4byte	.LASF896
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4.stdbool.h.29.eb124ecb79face0a1d832a352bec45e0,comdat
 .Ldebug_macro15:
@@ -3696,19 +4079,19 @@ main:
 	.byte	0
 	.byte	0x5
 	.uleb128 0x1d
-	.4byte	.LASF897
-	.byte	0x5
-	.uleb128 0x21
 	.4byte	.LASF898
 	.byte	0x5
-	.uleb128 0x23
+	.uleb128 0x21
 	.4byte	.LASF899
 	.byte	0x5
-	.uleb128 0x24
+	.uleb128 0x23
 	.4byte	.LASF900
 	.byte	0x5
-	.uleb128 0x32
+	.uleb128 0x24
 	.4byte	.LASF901
+	.byte	0x5
+	.uleb128 0x32
+	.4byte	.LASF902
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4.gpio.h.20.f43cb24618dcbca74136a185a6bbf080,comdat
 .Ldebug_macro16:
@@ -3716,25 +4099,89 @@ main:
 	.byte	0
 	.byte	0x5
 	.uleb128 0x14
-	.4byte	.LASF902
-	.byte	0x5
-	.uleb128 0x15
 	.4byte	.LASF903
 	.byte	0x5
-	.uleb128 0x16
+	.uleb128 0x15
 	.4byte	.LASF904
 	.byte	0x5
-	.uleb128 0x18
+	.uleb128 0x16
 	.4byte	.LASF905
 	.byte	0x5
-	.uleb128 0x1a
+	.uleb128 0x18
 	.4byte	.LASF906
 	.byte	0x5
-	.uleb128 0x1c
+	.uleb128 0x1a
 	.4byte	.LASF907
 	.byte	0x5
-	.uleb128 0x1e
+	.uleb128 0x1c
 	.4byte	.LASF908
+	.byte	0x5
+	.uleb128 0x1e
+	.4byte	.LASF909
+	.byte	0
+	.section	.debug_macro,"G",%progbits,wm4.flash.h.2.51d6f0499046dca8c8d7cee08875e55f,comdat
+.Ldebug_macro17:
+	.2byte	0x5
+	.byte	0
+	.byte	0x5
+	.uleb128 0x2
+	.4byte	.LASF910
+	.byte	0x5
+	.uleb128 0xf
+	.4byte	.LASF911
+	.byte	0x5
+	.uleb128 0x10
+	.4byte	.LASF912
+	.byte	0x5
+	.uleb128 0x14
+	.4byte	.LASF913
+	.byte	0x5
+	.uleb128 0x15
+	.4byte	.LASF914
+	.byte	0x5
+	.uleb128 0x18
+	.4byte	.LASF915
+	.byte	0x5
+	.uleb128 0x19
+	.4byte	.LASF916
+	.byte	0x5
+	.uleb128 0x1c
+	.4byte	.LASF917
+	.byte	0x5
+	.uleb128 0x1e
+	.4byte	.LASF918
+	.byte	0x5
+	.uleb128 0x1f
+	.4byte	.LASF919
+	.byte	0x5
+	.uleb128 0x20
+	.4byte	.LASF920
+	.byte	0
+	.section	.debug_macro,"G",%progbits,wm4.pwr.h.2.b22d01f8fafa27268c4600cc8f787804,comdat
+.Ldebug_macro18:
+	.2byte	0x5
+	.byte	0
+	.byte	0x5
+	.uleb128 0x2
+	.4byte	.LASF921
+	.byte	0x5
+	.uleb128 0xb
+	.4byte	.LASF922
+	.byte	0x5
+	.uleb128 0xc
+	.4byte	.LASF923
+	.byte	0x5
+	.uleb128 0xf
+	.4byte	.LASF924
+	.byte	0x5
+	.uleb128 0x12
+	.4byte	.LASF925
+	.byte	0x5
+	.uleb128 0x13
+	.4byte	.LASF926
+	.byte	0x5
+	.uleb128 0x14
+	.4byte	.LASF927
 	.byte	0
 	.section	.debug_line,"",%progbits
 .Ldebug_line0:
@@ -3751,7 +4198,7 @@ main:
 	.ascii	"__UHA_FBIT__ 8\000"
 .LASF814:
 	.ascii	"PRIiFAST64 __PRI64FAST(i)\000"
-.LASF911:
+.LASF930:
 	.ascii	"unsigned char\000"
 .LASF225:
 	.ascii	"__FLT64_DENORM_MIN__ 4.9406564584124654e-324F64\000"
@@ -3785,7 +4232,7 @@ main:
 	.ascii	"__WINT_MIN__ 0U\000"
 .LASF90:
 	.ascii	"__INTMAX_MAX__ 0x7fffffffffffffffLL\000"
-.LASF950:
+.LASF969:
 	.ascii	"GPIO_MODE_AF\000"
 .LASF335:
 	.ascii	"__TQ_IBIT__ 0\000"
@@ -3809,6 +4256,8 @@ main:
 	.ascii	"__FRACT_MIN__ (-0.5R-0.5R)\000"
 .LASF324:
 	.ascii	"__ULLACCUM_MAX__ 0XFFFFFFFFFFFFFFFFP-32ULLK\000"
+.LASF972:
+	.ascii	"flash\000"
 .LASF294:
 	.ascii	"__USACCUM_MAX__ 0XFFFFP-8UHK\000"
 .LASF246:
@@ -3863,8 +4312,8 @@ main:
 	.ascii	"INT_LEAST16_MAX (__INT_LEAST16_MAX__)\000"
 .LASF703:
 	.ascii	"SCNiFAST8 __SCN8FAST(i)\000"
-.LASF120:
-	.ascii	"__UINT_LEAST16_MAX__ 0xffff\000"
+.LASF790:
+	.ascii	"__SCN64FAST(x) __FAST64 __STRINGIFY(x)\000"
 .LASF616:
 	.ascii	"INT_FAST16_MAX (__INT_FAST16_MAX__)\000"
 .LASF281:
@@ -3875,6 +4324,10 @@ main:
 	.ascii	"_LDBL_EQ_DBL 1\000"
 .LASF675:
 	.ascii	"PRIi8 __PRI8(i)\000"
+.LASF916:
+	.ascii	"FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)\000"
+.LASF926:
+	.ascii	"PWR_CR_VOS_MASK (0b11)\000"
 .LASF62:
 	.ascii	"__INT_FAST64_TYPE__ long long int\000"
 .LASF37:
@@ -3891,7 +4344,7 @@ main:
 	.ascii	"__SCNPTR(x) __STRINGIFY(x)\000"
 .LASF202:
 	.ascii	"__FLT32_MAX_10_EXP__ 38\000"
-.LASF887:
+.LASF886:
 	.ascii	"RCC_CFGR_HPRE_BIT 4\000"
 .LASF682:
 	.ascii	"SCNo8 __SCN8(o)\000"
@@ -3907,12 +4360,12 @@ main:
 	.ascii	"__need_wchar_t\000"
 .LASF199:
 	.ascii	"__FLT32_MIN_EXP__ (-125)\000"
-.LASF956:
+.LASF979:
 	.ascii	"GNU C2X 12.3.1 20230626 -mcpu=cortex-m4 -mthumb -mf"
 	.ascii	"loat-abi=hard -mfpu=fpv4-sp-d16 -march=armv7e-m+fp "
 	.ascii	"-g3 -ggdb -O0 -std=c2x -ffunction-sections -fdata-s"
 	.ascii	"ections -fno-builtin -fno-common\000"
-.LASF862:
+.LASF859:
 	.ascii	"RCC_CR_HSEON_BIT 16\000"
 .LASF595:
 	.ascii	"INT16_MAX (__INT16_MAX__)\000"
@@ -3926,7 +4379,7 @@ main:
 	.ascii	"__int_fast32_t_defined 1\000"
 .LASF133:
 	.ascii	"__INT_FAST64_WIDTH__ 64\000"
-.LASF880:
+.LASF879:
 	.ascii	"RCC_CFGR_PPRE_DIV_NONE 0\000"
 .LASF659:
 	.ascii	"___int_wchar_t_h \000"
@@ -3968,7 +4421,7 @@ main:
 	.ascii	"__PRI32LEAST(x) __LEAST32 __STRINGIFY(x)\000"
 .LASF88:
 	.ascii	"__PTRDIFF_WIDTH__ 32\000"
-.LASF895:
+.LASF894:
 	.ascii	"RCC_CFGR_SW(clock) ((clock & RCC_CFGR_SW_MASK) << R"
 	.ascii	"CC_CFGR_SW_BIT)\000"
 .LASF134:
@@ -3981,7 +4434,7 @@ main:
 	.ascii	"__LACCUM_IBIT__ 32\000"
 .LASF592:
 	.ascii	"INT_LEAST8_MAX (__INT_LEAST8_MAX__)\000"
-.LASF889:
+.LASF888:
 	.ascii	"RCC_CFGR_SWS_PLL (0b10)\000"
 .LASF559:
 	.ascii	"__EXP\000"
@@ -3999,7 +4452,7 @@ main:
 	.ascii	"__INT64 \"ll\"\000"
 .LASF138:
 	.ascii	"__INTPTR_MAX__ 0x7fffffff\000"
-.LASF938:
+.LASF957:
 	.ascii	"AHB2LPENR\000"
 .LASF499:
 	.ascii	"__RAND_MAX\000"
@@ -4007,6 +4460,9 @@ main:
 	.ascii	"__UINT_FAST16_MAX__ 0xffffffffU\000"
 .LASF609:
 	.ascii	"INT_LEAST64_MIN (-__INT_LEAST64_MAX__ - 1)\000"
+.LASF896:
+	.ascii	"RCC_APB1ENR_PWREN_CLOCK_ENABLE (1 << RCC_APB1ENR_PW"
+	.ascii	"REN_BIT)\000"
 .LASF486:
 	.ascii	"__GNUC_PREREQ(maj,min) ((__GNUC__ << 16) + __GNUC_M"
 	.ascii	"INOR__ >= ((maj) << 16) + (min))\000"
@@ -4022,7 +4478,7 @@ main:
 	.ascii	"INT_FAST32_MIN (-__INT_FAST32_MAX__ - 1)\000"
 .LASF672:
 	.ascii	"__SCN8LEAST(x) __LEAST8 __STRINGIFY(x)\000"
-.LASF857:
+.LASF856:
 	.ascii	"RCC_CR_PLLON_ON (1 << RCC_CR_PLLON_BIT)\000"
 .LASF55:
 	.ascii	"__UINT_LEAST8_TYPE__ unsigned char\000"
@@ -4032,12 +4488,12 @@ main:
 	.ascii	"__ACCUM_FBIT__ 15\000"
 .LASF791:
 	.ascii	"PRId64 __PRI64(d)\000"
-.LASF873:
+.LASF872:
 	.ascii	"RCC_PLLCFGR_PLLP(p) ((p & RCC_PLLCFGR_PLLP_MASK) <<"
 	.ascii	" RCC_PLLCFGR_PLLP_BIT)\000"
 .LASF302:
 	.ascii	"__UACCUM_IBIT__ 16\000"
-.LASF914:
+.LASF933:
 	.ascii	"long int\000"
 .LASF719:
 	.ascii	"SCNd16 __SCN16(d)\000"
@@ -4055,7 +4511,7 @@ main:
 	.ascii	"__FLT32X_EPSILON__ 2.2204460492503131e-16F32x\000"
 .LASF556:
 	.ascii	"___int_least16_t_defined 1\000"
-.LASF879:
+.LASF878:
 	.ascii	"RCC_PLLCFGR_PLLM(m) ((m & RCC_PLLCFGR_PLLM_MASK) <<"
 	.ascii	" RCC_PLLCFGR_PLLM_BIT)\000"
 .LASF59:
@@ -4068,7 +4524,7 @@ main:
 	.ascii	"PRIdFAST32 __PRI32FAST(d)\000"
 .LASF93:
 	.ascii	"__UINTMAX_C(c) c ## ULL\000"
-.LASF866:
+.LASF865:
 	.ascii	"RCC_PLLCFGR_PLLQ_BIT 24\000"
 .LASF31:
 	.ascii	"__SIZEOF_POINTER__ 4\000"
@@ -4076,7 +4532,7 @@ main:
 	.ascii	"INT_FAST64_MIN (-__INT_FAST64_MAX__ - 1)\000"
 .LASF371:
 	.ascii	"__GCC_ATOMIC_BOOL_LOCK_FREE 2\000"
-.LASF894:
+.LASF893:
 	.ascii	"RCC_CFGR_SW_MASK (0b11)\000"
 .LASF432:
 	.ascii	"__ARM_NEON__\000"
@@ -4086,7 +4542,7 @@ main:
 	.ascii	"__FLT32_MAX_EXP__ 128\000"
 .LASF824:
 	.ascii	"__PRIMAX(x) __STRINGIFY(ll ##x)\000"
-.LASF959:
+.LASF982:
 	.ascii	"main\000"
 .LASF435:
 	.ascii	"__THUMB_INTERWORK__ 1\000"
@@ -4104,7 +4560,7 @@ main:
 	.ascii	"__CHAR32_TYPE__ long unsigned int\000"
 .LASF429:
 	.ascii	"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC\000"
-.LASF896:
+.LASF897:
 	.ascii	"GPIO_H_ \000"
 .LASF179:
 	.ascii	"__DBL_IS_IEC_60559__ 2\000"
@@ -4116,7 +4572,7 @@ main:
 	.ascii	"__SIZEOF_LONG__ 4\000"
 .LASF753:
 	.ascii	"PRIi32 __PRI32(i)\000"
-.LASF935:
+.LASF954:
 	.ascii	"APB2ENR\000"
 .LASF850:
 	.ascii	"RCC_H_ \000"
@@ -4130,9 +4586,11 @@ main:
 	.ascii	"__INT_LEAST32_WIDTH__ 32\000"
 .LASF232:
 	.ascii	"__FLT32X_MIN_EXP__ (-1021)\000"
+.LASF915:
+	.ascii	"FLASH_ACR_ICEN_BIT 9\000"
 .LASF815:
 	.ascii	"PRIoFAST64 __PRI64FAST(o)\000"
-.LASF937:
+.LASF956:
 	.ascii	"AHB1LPENR\000"
 .LASF406:
 	.ascii	"__ARM_FEATURE_SIMD32 1\000"
@@ -4144,7 +4602,7 @@ main:
 	.ascii	"PRIoLEAST16 __PRI16LEAST(o)\000"
 .LASF458:
 	.ascii	"__NEWLIB__ 4\000"
-.LASF947:
+.LASF966:
 	.ascii	"DCKCFGR\000"
 .LASF720:
 	.ascii	"SCNi16 __SCN16(i)\000"
@@ -4154,7 +4612,7 @@ main:
 	.ascii	"__FLT_DECIMAL_DIG__ 9\000"
 .LASF562:
 	.ascii	"_UINT8_T_DECLARED \000"
-.LASF910:
+.LASF929:
 	.ascii	"signed char\000"
 .LASF805:
 	.ascii	"PRIuLEAST64 __PRI64LEAST(u)\000"
@@ -4164,7 +4622,7 @@ main:
 	.ascii	"INTMAX_MIN (-INTMAX_MAX - 1)\000"
 .LASF364:
 	.ascii	"__GNUC_STDC_INLINE__ 1\000"
-.LASF952:
+.LASF971:
 	.ascii	"GPIO_MODE\000"
 .LASF256:
 	.ascii	"__FRACT_FBIT__ 15\000"
@@ -4176,44 +4634,47 @@ main:
 	.ascii	"__GNUC_PATCHLEVEL__ 1\000"
 .LASF374:
 	.ascii	"__GCC_ATOMIC_CHAR32_T_LOCK_FREE 2\000"
-.LASF867:
+.LASF866:
 	.ascii	"RCC_PLLCFGR_PLLQ_MASK (0b1111)\000"
-.LASF648:
-	.ascii	"__wchar_t__ \000"
+.LASF120:
+	.ascii	"__UINT_LEAST16_MAX__ 0xffff\000"
 .LASF410:
 	.ascii	"__ARM_ARCH_PROFILE 77\000"
 .LASF546:
 	.ascii	"_STDINT_H \000"
-.LASF897:
+.LASF898:
 	.ascii	"_STDBOOL_H \000"
 .LASF219:
 	.ascii	"__FLT64_MAX_10_EXP__ 308\000"
-.LASF875:
+.LASF874:
 	.ascii	"RCC_PLLCFGR_PLLN_MASK (0b111111111)\000"
-.LASF927:
+.LASF946:
 	.ascii	"RESERVED0\000"
-.LASF930:
+.LASF949:
 	.ascii	"RESERVED1\000"
-.LASF933:
+.LASF952:
 	.ascii	"RESERVED2\000"
 .LASF3:
 	.ascii	"__STDC_UTF_32__ 1\000"
-.LASF939:
+.LASF958:
 	.ascii	"RESERVED4\000"
 .LASF241:
 	.ascii	"__FLT32X_DENORM_MIN__ 4.9406564584124654e-324F32x\000"
-.LASF944:
+.LASF963:
 	.ascii	"RESERVED6\000"
 .LASF152:
 	.ascii	"__FLT_MAX_10_EXP__ 38\000"
 .LASF42:
 	.ascii	"__SIG_ATOMIC_TYPE__ int\000"
-.LASF884:
+.LASF883:
 	.ascii	"RCC_CFGR_PPRE1_BIT 10\000"
 .LASF259:
 	.ascii	"__FRACT_MAX__ 0X7FFFP-15R\000"
 .LASF728:
 	.ascii	"PRIxLEAST16 __PRI16LEAST(x)\000"
+.LASF927:
+	.ascii	"PWR_CR_VOS(scale) ((scale & PWR_CR_VOS_MASK) << PWR"
+	.ascii	"_CR_VOS_BIT)\000"
 .LASF130:
 	.ascii	"__INT_FAST32_MAX__ 0x7fffffff\000"
 .LASF10:
@@ -4222,7 +4683,7 @@ main:
 	.ascii	"_READ_WRITE_RETURN_TYPE int\000"
 .LASF771:
 	.ascii	"SCNoLEAST32 __SCN32LEAST(o)\000"
-.LASF892:
+.LASF891:
 	.ascii	"RCC_CFGR_SW_PLL (0b10)\000"
 .LASF844:
 	.ascii	"PRIXPTR __PRIPTR(X)\000"
@@ -4246,25 +4707,29 @@ main:
 	.ascii	"__int_fast64_t_defined 1\000"
 .LASF837:
 	.ascii	"__PRIPTR(x) __STRINGIFY(x)\000"
-.LASF921:
+.LASF940:
 	.ascii	"uint16_t\000"
 .LASF417:
 	.ascii	"__thumb2__ 1\000"
 .LASF321:
 	.ascii	"__ULLACCUM_FBIT__ 32\000"
-.LASF953:
+.LASF976:
 	.ascii	"_Bool\000"
+.LASF895:
+	.ascii	"RCC_APB1ENR_PWREN_BIT 28\000"
 .LASF366:
 	.ascii	"__STRICT_ANSI__ 1\000"
 .LASF485:
 	.ascii	"_SYS_FEATURES_H \000"
 .LASF812:
 	.ascii	"SCNxLEAST64 __SCN64LEAST(x)\000"
-.LASF936:
+.LASF769:
+	.ascii	"SCNdLEAST32 __SCN32LEAST(d)\000"
+.LASF955:
 	.ascii	"RESERVED3\000"
 .LASF22:
 	.ascii	"__SIZEOF_LONG_DOUBLE__ 8\000"
-.LASF942:
+.LASF961:
 	.ascii	"RESERVED5\000"
 .LASF386:
 	.ascii	"__PRAGMA_REDEFINE_EXTNAME 1\000"
@@ -4272,7 +4737,7 @@ main:
 	.ascii	"__WCHAR_TYPE__ unsigned int\000"
 .LASF469:
 	.ascii	"_MB_LEN_MAX 8\000"
-.LASF949:
+.LASF968:
 	.ascii	"GPIO_MODE_OUTPUT\000"
 .LASF357:
 	.ascii	"__USA_IBIT__ 16\000"
@@ -4286,7 +4751,7 @@ main:
 	.ascii	"__need_wchar_t \000"
 .LASF66:
 	.ascii	"__UINT_FAST64_TYPE__ long long unsigned int\000"
-.LASF890:
+.LASF889:
 	.ascii	"RCC_CFGR_SWS_BIT 2\000"
 .LASF156:
 	.ascii	"__FLT_MIN__ 1.1754943508222875e-38F\000"
@@ -4312,9 +4777,9 @@ main:
 	.ascii	"__SCN64(x) __INT64 __STRINGIFY(x)\000"
 .LASF646:
 	.ascii	"_GCC_WRAP_STDINT_H \000"
-.LASF915:
+.LASF934:
 	.ascii	"__uint16_t\000"
-.LASF932:
+.LASF951:
 	.ascii	"AHB2ENR\000"
 .LASF804:
 	.ascii	"PRIoLEAST64 __PRI64LEAST(o)\000"
@@ -4342,10 +4807,12 @@ main:
 	.ascii	"INTMAX_MAX (__INTMAX_MAX__)\000"
 .LASF601:
 	.ascii	"INT32_MAX (__INT32_MAX__)\000"
-.LASF905:
+.LASF906:
 	.ascii	"BIT(x) (1 << x)\000"
-.LASF350:
-	.ascii	"__DA_FBIT__ 31\000"
+.LASF985:
+	.ascii	"system_clock_init\000"
+.LASF912:
+	.ascii	"FLASH ((struct flash *) FLASH_BASE_ADDR)\000"
 .LASF69:
 	.ascii	"__GXX_ABI_VERSION 1017\000"
 .LASF109:
@@ -4354,16 +4821,16 @@ main:
 	.ascii	"__FLT_DENORM_MIN__ 1.4012984643248171e-45F\000"
 .LASF533:
 	.ascii	"__LEAST8 \"hh\"\000"
-.LASF886:
+.LASF885:
 	.ascii	"RCC_CFGR_HPRE_DIV_NONE 0\000"
-.LASF859:
-	.ascii	"RCC_CR_HSEBYP (1 << RCC_CR_HSEBYP_BIT)\000"
 .LASF539:
 	.ascii	"_END_STD_C \000"
-.LASF899:
+.LASF900:
 	.ascii	"true ((_Bool)+1u)\000"
 .LASF766:
 	.ascii	"PRIuLEAST32 __PRI32LEAST(u)\000"
+.LASF917:
+	.ascii	"FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)\000"
 .LASF599:
 	.ascii	"UINT_LEAST16_MAX (__UINT_LEAST16_MAX__)\000"
 .LASF123:
@@ -4372,15 +4839,13 @@ main:
 	.ascii	"PRIiLEAST16 __PRI16LEAST(i)\000"
 .LASF303:
 	.ascii	"__UACCUM_MIN__ 0.0UK\000"
-.LASF871:
+.LASF870:
 	.ascii	"RCC_PLLCFGR_PLLP_BIT 16\000"
 .LASF157:
 	.ascii	"__FLT_EPSILON__ 1.1920928955078125e-7F\000"
-.LASF856:
-	.ascii	"RCC_CR_PLLON_OFF (0 << RCC_CR_PLLON_BIT)\000"
-.LASF769:
-	.ascii	"SCNdLEAST32 __SCN32LEAST(d)\000"
-.LASF906:
+.LASF297:
+	.ascii	"__ACCUM_IBIT__ 16\000"
+.LASF907:
 	.ascii	"PIN(port,num) ((((port) - 'A') << 8) | num)\000"
 .LASF806:
 	.ascii	"PRIxLEAST64 __PRI64LEAST(x)\000"
@@ -4400,7 +4865,7 @@ main:
 	.ascii	"INT_LEAST32_MIN (-__INT_LEAST32_MAX__ - 1)\000"
 .LASF376:
 	.ascii	"__GCC_ATOMIC_SHORT_LOCK_FREE 2\000"
-.LASF864:
+.LASF863:
 	.ascii	"RCC_CR_HSION_BIT 0\000"
 .LASF778:
 	.ascii	"PRIxFAST32 __PRI32FAST(x)\000"
@@ -4416,10 +4881,8 @@ main:
 	.ascii	"__MISC_VISIBLE 0\000"
 .LASF306:
 	.ascii	"__LACCUM_FBIT__ 31\000"
-.LASF943:
+.LASF962:
 	.ascii	"BDCR\000"
-.LASF865:
-	.ascii	"RCC_CR_HSION_OFF (0 << RCC_CR_HSION_BIT)\000"
 .LASF211:
 	.ascii	"__FLT32_HAS_QUIET_NAN__ 1\000"
 .LASF484:
@@ -4452,7 +4915,7 @@ main:
 	.ascii	"__FP_FAST_FMAF 1\000"
 .LASF628:
 	.ascii	"SIG_ATOMIC_MIN (-__STDINT_EXP(INT_MAX) - 1)\000"
-.LASF863:
+.LASF860:
 	.ascii	"RCC_CR_HSEON_ON (1 << RCC_CR_HSEON_BIT)\000"
 .LASF564:
 	.ascii	"_INT16_T_DECLARED \000"
@@ -4474,15 +4937,13 @@ main:
 	.ascii	"__ARM_FEATURE_FP16_FML\000"
 .LASF802:
 	.ascii	"PRIdLEAST64 __PRI64LEAST(d)\000"
-.LASF858:
-	.ascii	"RCC_CR_HSEBYP_BIT 18\000"
 .LASF255:
 	.ascii	"__USFRACT_EPSILON__ 0x1P-8UHR\000"
-.LASF861:
+.LASF858:
 	.ascii	"RCC_CR_HSERDY_READY (1 << RCC_CR_HSERDY_BIT)\000"
 .LASF762:
 	.ascii	"SCNx32 __SCN32(x)\000"
-.LASF924:
+.LASF943:
 	.ascii	"CFGR\000"
 .LASF557:
 	.ascii	"___int_least32_t_defined 1\000"
@@ -4528,6 +4989,8 @@ main:
 	.ascii	"__PRI8LEAST(x) __LEAST8 __STRINGIFY(x)\000"
 .LASF174:
 	.ascii	"__DBL_EPSILON__ ((double)2.2204460492503131e-16L)\000"
+.LASF974:
+	.ascii	"OPTKEYR\000"
 .LASF268:
 	.ascii	"__LFRACT_MIN__ (-0.5LR-0.5LR)\000"
 .LASF117:
@@ -4550,7 +5013,7 @@ main:
 	.ascii	"___int8_t_defined 1\000"
 .LASF248:
 	.ascii	"__SFRACT_MIN__ (-0.5HR-0.5HR)\000"
-.LASF917:
+.LASF936:
 	.ascii	"long unsigned int\000"
 .LASF349:
 	.ascii	"__SA_IBIT__ 16\000"
@@ -4566,11 +5029,11 @@ main:
 	.ascii	"__ARM_FP16_FORMAT_IEEE\000"
 .LASF48:
 	.ascii	"__UINT16_TYPE__ short unsigned int\000"
-.LASF869:
+.LASF868:
 	.ascii	"RCC_PLLCFGR_PLLSRC_BIT 22\000"
-.LASF954:
+.LASF977:
 	.ascii	"gpio_write\000"
-.LASF900:
+.LASF901:
 	.ascii	"false ((_Bool)+0u)\000"
 .LASF656:
 	.ascii	"_WCHAR_T_DEFINED_ \000"
@@ -4578,11 +5041,11 @@ main:
 	.ascii	"__FLT_EVAL_METHOD_TS_18661_3__ 0\000"
 .LASF521:
 	.ascii	"int +2\000"
-.LASF958:
+.LASF981:
 	.ascii	"/home/alex/code/own/c-compile-experiments\000"
 .LASF636:
 	.ascii	"INT8_C(x) __INT8_C(x)\000"
-.LASF909:
+.LASF928:
 	.ascii	"exit 42\000"
 .LASF63:
 	.ascii	"__UINT_FAST8_TYPE__ unsigned int\000"
@@ -4614,7 +5077,7 @@ main:
 	.ascii	"SCNx8 __SCN8(x)\000"
 .LASF208:
 	.ascii	"__FLT32_DENORM_MIN__ 1.4012984643248171e-45F32\000"
-.LASF955:
+.LASF978:
 	.ascii	"gpio_set_mode\000"
 .LASF125:
 	.ascii	"__UINT64_C(c) c ## ULL\000"
@@ -4634,7 +5097,7 @@ main:
 	.ascii	"__GCC_ATOMIC_CHAR16_T_LOCK_FREE 2\000"
 .LASF789:
 	.ascii	"__PRI64FAST(x) __FAST64 __STRINGIFY(x)\000"
-.LASF893:
+.LASF892:
 	.ascii	"RCC_CFGR_SW_BIT 0\000"
 .LASF168:
 	.ascii	"__DBL_MAX_EXP__ 1024\000"
@@ -4662,8 +5125,6 @@ main:
 	.ascii	"_INT32_T_DECLARED \000"
 .LASF1:
 	.ascii	"__STDC_VERSION__ 202000L\000"
-.LASF790:
-	.ascii	"__SCN64FAST(x) __FAST64 __STRINGIFY(x)\000"
 .LASF531:
 	.ascii	"__FAST32 \000"
 .LASF519:
@@ -4684,12 +5145,12 @@ main:
 	.ascii	"SCNxLEAST32 __SCN32LEAST(x)\000"
 .LASF711:
 	.ascii	"__SCN16LEAST(x) __LEAST16 __STRINGIFY(x)\000"
-.LASF923:
-	.ascii	"PLLCFGR\000"
 .LASF5:
 	.ascii	"__GNUC__ 12\000"
 .LASF692:
 	.ascii	"SCNiLEAST8 __SCN8LEAST(i)\000"
+.LASF923:
+	.ascii	"PWR ((struct pwr *) PWR_BASE_ADDR)\000"
 .LASF752:
 	.ascii	"PRId32 __PRI32(d)\000"
 .LASF84:
@@ -4712,7 +5173,7 @@ main:
 	.ascii	"__ULACCUM_MIN__ 0.0ULK\000"
 .LASF461:
 	.ascii	"_ATEXIT_DYNAMIC_ALLOC 1\000"
-.LASF916:
+.LASF935:
 	.ascii	"__uint32_t\000"
 .LASF188:
 	.ascii	"__LDBL_MAX__ 1.7976931348623157e+308L\000"
@@ -4722,7 +5183,7 @@ main:
 	.ascii	"__FLT_RADIX__ 2\000"
 .LASF454:
 	.ascii	"_INTTYPES_H \000"
-.LASF918:
+.LASF937:
 	.ascii	"long long int\000"
 .LASF784:
 	.ascii	"SCNxFAST32 __SCN32FAST(x)\000"
@@ -4730,6 +5191,10 @@ main:
 	.ascii	"__ARM_FEATURE_CMSE\000"
 .LASF602:
 	.ascii	"UINT32_MAX (__UINT32_MAX__)\000"
+.LASF648:
+	.ascii	"__wchar_t__ \000"
+.LASF925:
+	.ascii	"PWR_CR_VOS_BIT 14\000"
 .LASF195:
 	.ascii	"__LDBL_HAS_QUIET_NAN__ 1\000"
 .LASF85:
@@ -4754,8 +5219,12 @@ main:
 	.ascii	"__INTPTR_WIDTH__ 32\000"
 .LASF379:
 	.ascii	"__GCC_ATOMIC_LLONG_LOCK_FREE 1\000"
+.LASF942:
+	.ascii	"PLLCFGR\000"
 .LASF239:
 	.ascii	"__FLT32X_MIN__ 2.2250738585072014e-308F32x\000"
+.LASF918:
+	.ascii	"FLASH_ACR_LATENCY_BIT 0\000"
 .LASF218:
 	.ascii	"__FLT64_MAX_EXP__ 1024\000"
 .LASF653:
@@ -4766,7 +5235,7 @@ main:
 	.ascii	"___int32_t_defined 1\000"
 .LASF83:
 	.ascii	"__INT_WIDTH__ 32\000"
-.LASF929:
+.LASF948:
 	.ascii	"APB2RSTR\000"
 .LASF409:
 	.ascii	"__ARM_ARCH_PROFILE\000"
@@ -4816,15 +5285,15 @@ main:
 	.ascii	"__ARM_NEON_FP\000"
 .LASF280:
 	.ascii	"__LLFRACT_EPSILON__ 0x1P-63LLR\000"
-.LASF941:
+.LASF960:
 	.ascii	"APB2LPENR\000"
 .LASF820:
 	.ascii	"SCNiFAST64 __SCN64FAST(i)\000"
-.LASF960:
+.LASF983:
 	.ascii	"spin\000"
 .LASF683:
 	.ascii	"SCNu8 __SCN8(u)\000"
-.LASF961:
+.LASF984:
 	.ascii	"count\000"
 .LASF261:
 	.ascii	"__UFRACT_FBIT__ 16\000"
@@ -4839,16 +5308,19 @@ main:
 	.ascii	"__FLOAT_TYPE float\000"
 .LASF185:
 	.ascii	"__LDBL_MAX_10_EXP__ 308\000"
+.LASF920:
+	.ascii	"FLASH_ACR_LATENCY(latency) ((latency & FLASH_ACR_LA"
+	.ascii	"TENCY_MASK) << FLASH_ACR_LATENCY_BIT)\000"
 .LASF175:
 	.ascii	"__DBL_DENORM_MIN__ ((double)4.9406564584124654e-324"
 	.ascii	"L)\000"
 .LASF607:
 	.ascii	"INT64_MAX (__INT64_MAX__)\000"
-.LASF920:
+.LASF939:
 	.ascii	"unsigned int\000"
-.LASF860:
+.LASF857:
 	.ascii	"RCC_CR_HSERDY_BIT 17\000"
-.LASF903:
+.LASF904:
 	.ascii	"GPIO_PORT_OFFSET (0x400U)\000"
 .LASF459:
 	.ascii	"__NEWLIB_MINOR__ 3\000"
@@ -4862,6 +5334,8 @@ main:
 	.ascii	"PRIiFAST16 __PRI16FAST(i)\000"
 .LASF292:
 	.ascii	"__USACCUM_IBIT__ 8\000"
+.LASF914:
+	.ascii	"FLASH_ACR_DCEN_ENABLE (1 <<FLASH_ACR_DCEN_BIT)\000"
 .LASF612:
 	.ascii	"INT_FAST8_MIN (-__INT_FAST8_MAX__ - 1)\000"
 .LASF226:
@@ -4920,19 +5394,23 @@ main:
 	.ascii	"__ARM_FEATURE_COPROC 15\000"
 .LASF483:
 	.ascii	"__OBSOLETE_MATH_DEFAULT 1\000"
+.LASF864:
+	.ascii	"RCC_CR_HSION_ON (1 << RCC_CR_HSION_BIT)\000"
 .LASF670:
 	.ascii	"__PRI8FAST(x) __FAST8 __STRINGIFY(x)\000"
 .LASF82:
 	.ascii	"__SHRT_WIDTH__ 16\000"
-.LASF881:
+.LASF880:
 	.ascii	"RCC_CFGR_PPRE_DIV_2 (0b100)\000"
 .LASF472:
 	.ascii	"_UNBUF_STREAM_OPT 1\000"
 .LASF667:
 	.ascii	"__STRINGIFY(a) #a\000"
+.LASF921:
+	.ascii	"PWR_H_ \000"
 .LASF356:
 	.ascii	"__USA_FBIT__ 16\000"
-.LASF940:
+.LASF959:
 	.ascii	"APB1LPENR\000"
 .LASF479:
 	.ascii	"__IEEE_LITTLE_ENDIAN \000"
@@ -4958,7 +5436,7 @@ main:
 	.ascii	"SCNxFAST64 __SCN64FAST(x)\000"
 .LASF681:
 	.ascii	"SCNi8 __SCN8(i)\000"
-.LASF945:
+.LASF964:
 	.ascii	"SSCGR\000"
 .LASF407:
 	.ascii	"__ARM_SIZEOF_MINIMAL_ENUM 1\000"
@@ -4982,6 +5460,8 @@ main:
 	.ascii	"__ARM_FP16_FORMAT_ALTERNATIVE\000"
 .LASF189:
 	.ascii	"__LDBL_NORM_MAX__ 1.7976931348623157e+308L\000"
+.LASF350:
+	.ascii	"__DA_FBIT__ 31\000"
 .LASF547:
 	.ascii	"_MACHINE__DEFAULT_TYPES_H \000"
 .LASF25:
@@ -4992,6 +5472,8 @@ main:
 	.ascii	"__SCN16FAST(x) __FAST16 __STRINGIFY(x)\000"
 .LASF536:
 	.ascii	"__LEAST64 \"ll\"\000"
+.LASF862:
+	.ascii	"RCC_CR_HSIRDY_READY (1 << RCC_CR_HSIRDY_BIT)\000"
 .LASF658:
 	.ascii	"_WCHAR_T_H \000"
 .LASF395:
@@ -5036,11 +5518,11 @@ main:
 	.ascii	"SCNuFAST16 __SCN16FAST(u)\000"
 .LASF801:
 	.ascii	"SCNx64 __SCN64(x)\000"
-.LASF908:
+.LASF909:
 	.ascii	"PINPORT(pin) (pin >> 8)\000"
 .LASF198:
 	.ascii	"__FLT32_DIG__ 6\000"
-.LASF885:
+.LASF884:
 	.ascii	"RCC_CFGR_PPRE1_MASK (0b111)\000"
 .LASF645:
 	.ascii	"UINTMAX_C(x) __UINTMAX_C(x)\000"
@@ -5058,17 +5540,17 @@ main:
 	.ascii	"__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1\000"
 .LASF733:
 	.ascii	"SCNuLEAST16 __SCN16LEAST(u)\000"
-.LASF928:
+.LASF947:
 	.ascii	"APB1RSTR\000"
 .LASF298:
 	.ascii	"__ACCUM_MIN__ (-0X1P15K-0X1P15K)\000"
 .LASF393:
 	.ascii	"__ARM_FEATURE_CRYPTO\000"
-.LASF934:
+.LASF953:
 	.ascii	"APB1ENR\000"
 .LASF741:
 	.ascii	"SCNdFAST16 __SCN16FAST(d)\000"
-.LASF868:
+.LASF867:
 	.ascii	"RCC_PLLCFGR_PLLQ(q) ((q & RCC_PLLCFGR_PLLQ_MASK) <<"
 	.ascii	" RCC_PLLCFGR_PLLQ_BIT)\000"
 .LASF787:
@@ -5089,18 +5571,18 @@ main:
 	.ascii	"__NEWLIB_PATCHLEVEL__ 0\000"
 .LASF26:
 	.ascii	"__ORDER_LITTLE_ENDIAN__ 1234\000"
-.LASF870:
+.LASF869:
 	.ascii	"RCC_PLLCFGR_PLLSRC_HSE (1 << RCC_PLLCFGR_PLLSRC_BIT"
 	.ascii	")\000"
 .LASF155:
 	.ascii	"__FLT_NORM_MAX__ 3.4028234663852886e+38F\000"
-.LASF919:
+.LASF938:
 	.ascii	"long long unsigned int\000"
 .LASF611:
 	.ascii	"UINT_LEAST64_MAX (__UINT_LEAST64_MAX__)\000"
 .LASF150:
 	.ascii	"__FLT_MIN_10_EXP__ (-37)\000"
-.LASF891:
+.LASF890:
 	.ascii	"RCC_CFGR_SWS_MASK (0b11)\000"
 .LASF312:
 	.ascii	"__ULACCUM_IBIT__ 32\000"
@@ -5134,11 +5616,13 @@ main:
 	.ascii	"__SACCUM_MIN__ (-0X1P7HK-0X1P7HK)\000"
 .LASF274:
 	.ascii	"__ULFRACT_MAX__ 0XFFFFFFFFP-32ULR\000"
-.LASF876:
+.LASF875:
 	.ascii	"RCC_PLLCFGR_PLLN(n) ((n & RCC_PLLCFGR_PLLN_MASK) <<"
 	.ascii	" RCC_PLLCFGR_PLLN_BIT)\000"
 .LASF56:
 	.ascii	"__UINT_LEAST16_TYPE__ short unsigned int\000"
+.LASF924:
+	.ascii	"PWR_SCALE3 (0b11)\000"
 .LASF573:
 	.ascii	"_INTMAX_T_DECLARED \000"
 .LASF309:
@@ -5203,7 +5687,9 @@ main:
 	.ascii	"PRIoMAX __PRIMAX(o)\000"
 .LASF747:
 	.ascii	"__SCN32(x) __INT32 __STRINGIFY(x)\000"
-.LASF948:
+.LASF919:
+	.ascii	"FLASH_ACR_LATENCY_MASK (0b1111)\000"
+.LASF967:
 	.ascii	"GPIO_MODE_INPUT\000"
 .LASF743:
 	.ascii	"SCNoFAST16 __SCN16FAST(o)\000"
@@ -5261,7 +5747,7 @@ main:
 	.ascii	"__UINT_LEAST32_TYPE__ long unsigned int\000"
 .LASF405:
 	.ascii	"__ARM_FEATURE_NUMERIC_MAXMIN\000"
-.LASF902:
+.LASF903:
 	.ascii	"GPIO_BASE_ADDR (0x40020000U)\000"
 .LASF38:
 	.ascii	"__INTMAX_TYPE__ long long int\000"
@@ -5271,7 +5757,7 @@ main:
 	.ascii	"__ARM_ARCH_7EM__ 1\000"
 .LASF428:
 	.ascii	"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC\000"
-.LASF931:
+.LASF950:
 	.ascii	"AHB1ENR\000"
 .LASF295:
 	.ascii	"__USACCUM_EPSILON__ 0x1P-8UHK\000"
@@ -5311,11 +5797,11 @@ main:
 	.ascii	"__DBL_DIG__ 15\000"
 .LASF275:
 	.ascii	"__ULFRACT_EPSILON__ 0x1P-32ULR\000"
-.LASF926:
+.LASF945:
 	.ascii	"AHB2RSTR\000"
 .LASF671:
 	.ascii	"__SCN8(x) __INT8 __STRINGIFY(x)\000"
-.LASF883:
+.LASF882:
 	.ascii	"RCC_CFGR_PPRE2_MASK (0b111)\000"
 .LASF23:
 	.ascii	"__SIZEOF_SIZE_T__ 4\000"
@@ -5333,15 +5819,15 @@ main:
 	.ascii	"__LDBL_MIN__ 2.2250738585072014e-308L\000"
 .LASF445:
 	.ascii	"__ARM_FEATURE_CDE\000"
-.LASF297:
-	.ascii	"__ACCUM_IBIT__ 16\000"
+.LASF973:
+	.ascii	"KEYR\000"
 .LASF716:
 	.ascii	"PRIu16 __PRI16(u)\000"
 .LASF509:
 	.ascii	"unsigned\000"
 .LASF381:
 	.ascii	"__GCC_DESTRUCTIVE_SIZE 64\000"
-.LASF912:
+.LASF931:
 	.ascii	"short int\000"
 .LASF835:
 	.ascii	"SCNuMAX __SCNMAX(u)\000"
@@ -5351,7 +5837,7 @@ main:
 	.ascii	"__UDA_IBIT__ 32\000"
 .LASF534:
 	.ascii	"__LEAST16 \"h\"\000"
-.LASF878:
+.LASF877:
 	.ascii	"RCC_PLLCFGR_PLLM_MASK (0b111111)\000"
 .LASF586:
 	.ascii	"INTPTR_MAX (__INTPTR_MAX__)\000"
@@ -5365,7 +5851,7 @@ main:
 	.ascii	"_ATTRIBUTE(attrs) __attribute__ (attrs)\000"
 .LASF443:
 	.ascii	"__ARM_FEATURE_COPROC\000"
-.LASF951:
+.LASF970:
 	.ascii	"GPIO_MODE_ANALOG\000"
 .LASF177:
 	.ascii	"__DBL_HAS_INFINITY__ 1\000"
@@ -5375,6 +5861,8 @@ main:
 	.ascii	"UINT64_MAX (__UINT64_MAX__)\000"
 .LASF471:
 	.ascii	"_RETARGETABLE_LOCKING 1\000"
+.LASF913:
+	.ascii	"FLASH_ACR_DCEN_BIT 10\000"
 .LASF453:
 	.ascii	"__USES_INITFINI__ 1\000"
 .LASF637:
@@ -5397,7 +5885,7 @@ main:
 	.ascii	"__INT16_MAX__ 0x7fff\000"
 .LASF478:
 	.ascii	"__SYS_CONFIG_H__ \000"
-.LASF877:
+.LASF876:
 	.ascii	"RCC_PLLCFGR_PLLM_BIT 0\000"
 .LASF8:
 	.ascii	"__VERSION__ \"12.3.1 20230626\"\000"
@@ -5433,7 +5921,7 @@ main:
 	.ascii	"PRIdMAX __PRIMAX(d)\000"
 .LASF388:
 	.ascii	"__SIZEOF_WINT_T__ 4\000"
-.LASF882:
+.LASF881:
 	.ascii	"RCC_CFGR_PPRE2_BIT 13\000"
 .LASF782:
 	.ascii	"SCNoFAST32 __SCN32FAST(o)\000"
@@ -5447,7 +5935,7 @@ main:
 	.ascii	"PRIXFAST8 __PRI8FAST(X)\000"
 .LASF308:
 	.ascii	"__LACCUM_MIN__ (-0X1P31LK-0X1P31LK)\000"
-.LASF957:
+.LASF980:
 	.ascii	"src/main.c\000"
 .LASF126:
 	.ascii	"__INT_FAST8_MAX__ 0x7fffffff\000"
@@ -5489,7 +5977,7 @@ main:
 	.ascii	"__GCC_CONSTRUCTIVE_SIZE 64\000"
 .LASF664:
 	.ascii	"_BSD_WCHAR_T_\000"
-.LASF946:
+.LASF965:
 	.ascii	"PLLI2SCFGR\000"
 .LASF277:
 	.ascii	"__LLFRACT_IBIT__ 0\000"
@@ -5499,18 +5987,22 @@ main:
 	.ascii	"PRIx32 __PRI32(x)\000"
 .LASF278:
 	.ascii	"__LLFRACT_MIN__ (-0.5LLR-0.5LLR)\000"
-.LASF922:
+.LASF941:
 	.ascii	"uint32_t\000"
-.LASF874:
+.LASF873:
 	.ascii	"RCC_PLLCFGR_PLLN_BIT 6\000"
 .LASF689:
 	.ascii	"PRIxLEAST8 __PRI8LEAST(x)\000"
 .LASF506:
 	.ascii	"_SYS__INTSUP_H \000"
+.LASF975:
+	.ascii	"OPTCR\000"
 .LASF290:
 	.ascii	"__SACCUM_EPSILON__ 0x1P-7HK\000"
 .LASF415:
 	.ascii	"__GCC_ASM_FLAG_OUTPUTS__ 1\000"
+.LASF911:
+	.ascii	"FLASH_BASE_ADDR (0x40023C00U)\000"
 .LASF745:
 	.ascii	"SCNxFAST16 __SCN16FAST(x)\000"
 .LASF470:
@@ -5535,7 +6027,7 @@ main:
 	.ascii	"__LDBL_DIG__ 15\000"
 .LASF89:
 	.ascii	"__SIZE_WIDTH__ 32\000"
-.LASF872:
+.LASF871:
 	.ascii	"RCC_PLLCFGR_PLLP_MASK (0b11)\000"
 .LASF480:
 	.ascii	"_SUPPORTS_ERREXCEPT \000"
@@ -5551,13 +6043,13 @@ main:
 	.ascii	"__INT_LEAST16_TYPE__ short int\000"
 .LASF159:
 	.ascii	"__FLT_HAS_DENORM__ 1\000"
-.LASF907:
+.LASF908:
 	.ascii	"PINNUM(pin) (pin & 0b1111)\000"
 .LASF768:
 	.ascii	"PRIXLEAST32 __PRI32LEAST(X)\000"
 .LASF171:
 	.ascii	"__DBL_MAX__ ((double)1.7976931348623157e+308L)\000"
-.LASF913:
+.LASF932:
 	.ascii	"short unsigned int\000"
 .LASF276:
 	.ascii	"__LLFRACT_FBIT__ 63\000"
@@ -5571,17 +6063,21 @@ main:
 	.ascii	"PRIXLEAST8 __PRI8LEAST(X)\000"
 .LASF328:
 	.ascii	"__HQ_FBIT__ 15\000"
-.LASF901:
+.LASF902:
 	.ascii	"__bool_true_false_are_defined 1\000"
-.LASF904:
+.LASF905:
 	.ascii	"GPIO(port) ((struct gpio*)(uintptr_t)(GPIO_BASE_ADD"
 	.ascii	"R + (GPIO_PORT_OFFSET * port)))\000"
 .LASF798:
 	.ascii	"SCNi64 __SCN64(i)\000"
+.LASF861:
+	.ascii	"RCC_CR_HSIRDY_BIT 1\000"
 .LASF80:
 	.ascii	"__SIZE_MAX__ 0xffffffffU\000"
 .LASF818:
 	.ascii	"PRIXFAST64 __PRI64FAST(X)\000"
+.LASF910:
+	.ascii	"FLASH_H_ \000"
 .LASF412:
 	.ascii	"__ARM_ARCH\000"
 .LASF590:
@@ -5598,7 +6094,7 @@ main:
 	.ascii	"SCNuFAST32 __SCN32FAST(u)\000"
 .LASF522:
 	.ascii	"long +4\000"
-.LASF925:
+.LASF944:
 	.ascii	"AHB1RSTR\000"
 .LASF723:
 	.ascii	"SCNx16 __SCN16(x)\000"
@@ -5650,7 +6146,7 @@ main:
 	.ascii	"INT_FAST32_MAX (__INT_FAST32_MAX__)\000"
 .LASF205:
 	.ascii	"__FLT32_NORM_MAX__ 3.4028234663852886e+38F32\000"
-.LASF898:
+.LASF899:
 	.ascii	"bool _Bool\000"
 .LASF698:
 	.ascii	"PRIoFAST8 __PRI8FAST(o)\000"
@@ -5662,7 +6158,7 @@ main:
 	.ascii	"__ULFRACT_IBIT__ 0\000"
 .LASF852:
 	.ascii	"RCC ((struct rcc *) RCC_BASE_ADDR)\000"
-.LASF888:
+.LASF887:
 	.ascii	"RCC_CFGR_HPRE_MASK (0b1111)\000"
 .LASF72:
 	.ascii	"__INT_MAX__ 0x7fffffff\000"
@@ -5670,6 +6166,8 @@ main:
 	.ascii	"__INT_LEAST64_TYPE__ long long int\000"
 .LASF103:
 	.ascii	"__UINT16_MAX__ 0xffff\000"
+.LASF922:
+	.ascii	"PWR_BASE_ADDR (0x40007000U)\000"
 .LASF446:
 	.ascii	"__ARM_FEATURE_CDE_COPROC\000"
 .LASF765:
diff --git a/build/main.i b/build/main.i
index 8675bbd..ed3b075 100644
--- a/build/main.i
+++ b/build/main.i
@@ -2012,14 +2012,9 @@ struct rcc {
 
 
 #define RCC_CR_PLLON_BIT 24
-#define RCC_CR_PLLON_OFF (0 << RCC_CR_PLLON_BIT)
 #define RCC_CR_PLLON_ON (1 << RCC_CR_PLLON_BIT)
 
 
-#define RCC_CR_HSEBYP_BIT 18
-#define RCC_CR_HSEBYP (1 << RCC_CR_HSEBYP_BIT)
-
-
 #define RCC_CR_HSERDY_BIT 17
 #define RCC_CR_HSERDY_READY (1 << RCC_CR_HSERDY_BIT)
 
@@ -2027,8 +2022,13 @@ struct rcc {
 #define RCC_CR_HSEON_BIT 16
 #define RCC_CR_HSEON_ON (1 << RCC_CR_HSEON_BIT)
 
+
+#define RCC_CR_HSIRDY_BIT 1
+#define RCC_CR_HSIRDY_READY (1 << RCC_CR_HSIRDY_BIT)
+
+
 #define RCC_CR_HSION_BIT 0
-#define RCC_CR_HSION_OFF (0 << RCC_CR_HSION_BIT)
+#define RCC_CR_HSION_ON (1 << RCC_CR_HSION_BIT)
 
 
 #define RCC_PLLCFGR_PLLQ_BIT 24
@@ -2081,6 +2081,10 @@ struct rcc {
 #define RCC_CFGR_SW_BIT 0
 #define RCC_CFGR_SW_MASK (0b11)
 #define RCC_CFGR_SW(clock) ((clock & RCC_CFGR_SW_MASK) << RCC_CFGR_SW_BIT)
+
+
+#define RCC_APB1ENR_PWREN_BIT 28
+#define RCC_APB1ENR_PWREN_CLOCK_ENABLE (1 << RCC_APB1ENR_PWREN_BIT)
 # 3 "src/main.c" 2
 # 1 "src/gpio.h" 1
 
@@ -2140,28 +2144,150 @@ void gpio_write(uint16_t pin,
 # 40 "src/gpio.h"
                                   val);
 # 4 "src/main.c" 2
+# 1 "src/flash.h" 1
+
+#define FLASH_H_ 
+
+
+
+struct flash {
+  volatile uint32_t ACR;
+  volatile uint32_t KEYR;
+  volatile uint32_t OPTKEYR;
+  volatile uint32_t SR;
+  volatile uint32_t CR;
+  volatile uint32_t OPTCR;
+};
+
+#define FLASH_BASE_ADDR (0x40023C00U)
+#define FLASH ((struct flash *) FLASH_BASE_ADDR)
+
+
+
+#define FLASH_ACR_DCEN_BIT 10
+#define FLASH_ACR_DCEN_ENABLE (1 <<FLASH_ACR_DCEN_BIT)
+
+
+#define FLASH_ACR_ICEN_BIT 9
+#define FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)
+
+
+#define FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)
+
+#define FLASH_ACR_LATENCY_BIT 0
+#define FLASH_ACR_LATENCY_MASK (0b1111)
+#define FLASH_ACR_LATENCY(latency) ((latency & FLASH_ACR_LATENCY_MASK) << FLASH_ACR_LATENCY_BIT)
+# 5 "src/main.c" 2
+# 1 "src/pwr.h" 1
+
+#define PWR_H_ 
+
+
+
+struct pwr {
+  volatile uint32_t CR;
+  volatile uint32_t CSR;
+};
+
+#define PWR_BASE_ADDR (0x40007000U)
+#define PWR ((struct pwr *) PWR_BASE_ADDR)
+
+
+#define PWR_SCALE3 (0b11)
+
+
+#define PWR_CR_VOS_BIT 14
+#define PWR_CR_VOS_MASK (0b11)
+#define PWR_CR_VOS(scale) ((scale & PWR_CR_VOS_MASK) << PWR_CR_VOS_BIT)
+# 6 "src/main.c" 2
 
 #define exit 42
 
+static void system_clock_init(void) {
+
+  ((struct rcc *) (0x40023800U))->APB1ENR |= (1 << 28);
+
+
+  ((struct pwr *) (0x40007000U))->CR &= ~((0b11) << 14);
+  ((struct pwr *) (0x40007000U))->CR |= ((0b11) << 14);
+
+
+  ((struct rcc *) (0x40023800U))->CR |= (1 << 16);
+
+
+
+  while (!(((struct rcc *) (0x40023800U))->CR & (1 << 17)));
+
+
+
+  ((struct rcc *) (0x40023800U))->CR &= ~(1 << 24);
+
+
+  ((struct rcc *) (0x40023800U))->PLLCFGR |= (1 << 22);
+
+
+  ((struct rcc *) (0x40023800U))->PLLCFGR |= ((25 & (0b111111)) << 0) | ((196 & (0b111111111)) << 6) | ((2 & (0b11)) << 16) | ((4 & (0b1111)) << 24);
+
+
+  ((struct rcc *) (0x40023800U))->CFGR &= ~((0b1111) << 4);
+  ((struct rcc *) (0x40023800U))->CFGR |= (0 << 4);
+
+
+  ((struct rcc *) (0x40023800U))->CFGR &= ~((0b111) << 10);
+  ((struct rcc *) (0x40023800U))->CFGR |= ((0b100) << 10);
+
+
+  ((struct rcc *) (0x40023800U))->CFGR &= ~((0b111) << 13);
+  ((struct rcc *) (0x40023800U))->CFGR |= (0 << 13);
+
+
+  ((struct rcc *) (0x40023800U))->CR |= (1 << 24);
+
+
+
+  while (!(((struct rcc *) (0x40023800U))->CR & (1 << 17)));
+
+
+  ((struct flash *) (0x40023C00U))->ACR |= (1 <<10);
+  ((struct flash *) (0x40023C00U))->ACR |= (1 <<9);
+
+
+  ((struct flash *) (0x40023C00U))->ACR &= ~((0b1111) << 0);
+  ((struct rcc *) (0x40023800U))->CFGR |= ((0x0111) << 0);
+
+
+  ((struct rcc *) (0x40023800U))->CFGR &= ~((0b11) << 0);
+  ((struct rcc *) (0x40023800U))->CFGR |= ((0b10) << 0);
+
+
+
+  while (((((struct rcc *) (0x40023800U))->CFGR >> 2) & (0b11)) != (0b10));
+
+
+  ((struct rcc *) (0x40023800U))->CR &= ~(1 << 0);
+}
+
 static inline void spin(volatile uint32_t count) {
   while (count--) (void) 0;
 }
 
 int main(void) {
+  (void) system_clock_init();
+
   uint16_t led = (((('C') - 'A') << 8) | 13);
   ((struct rcc *) (0x40023800U))->AHB1ENR |= (1 << (led >> 8));
   gpio_set_mode(led, GPIO_MODE_OUTPUT);
   for (;;) {
     gpio_write(led, 
-# 16 "src/main.c" 3 4
+# 84 "src/main.c" 3 4
                    ((_Bool)+1u)
-# 16 "src/main.c"
+# 84 "src/main.c"
                        );
     spin(999999);
     gpio_write(led, 
-# 18 "src/main.c" 3 4
+# 86 "src/main.c" 3 4
                    ((_Bool)+0u)
-# 18 "src/main.c"
+# 86 "src/main.c"
                         );
     spin(999999);
   };
diff --git a/build/main.o b/build/main.o
index 8c3c42b73302b4fe27b092268dc4ecf82a11b3f0..12ff0e92e775672f785ee46b7cbc586dd5143efb 100644
GIT binary patch
delta 21510
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diff --git a/src/flash.h b/src/flash.h
index 780cee5..aa17358 100644
--- a/src/flash.h
+++ b/src/flash.h
@@ -17,7 +17,6 @@ struct flash {
 
 // ACR Register
 // Data cache enable
-
 #define FLASH_ACR_DCEN_BIT 10
 #define FLASH_ACR_DCEN_ENABLE (1 <<FLASH_ACR_DCEN_BIT)
 
diff --git a/src/main.c b/src/main.c
index 0c6b7f0..fbe656f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,14 +1,82 @@
 #include <inttypes.h>
 #include "rcc.h"
 #include "gpio.h"
+#include "flash.h"
+#include "pwr.h"
 
 #define exit 42
 
+static void system_clock_init(void) {
+  // Power on clock for PLL
+  RCC->APB1ENR |= RCC_APB1ENR_PWREN_CLOCK_ENABLE;
+
+  // Set voltage scaling to "high"
+  PWR->CR &= ~(PWR_CR_VOS_MASK << PWR_CR_VOS_BIT);
+  PWR->CR |= (PWR_SCALE3 << PWR_CR_VOS_BIT);
+
+  // Turn on HSE
+  RCC->CR |= RCC_CR_HSEON_ON;
+
+  // Wait indefinitely for HSE to be ready
+  // TODO indicate error/timeout somehow?
+  while (!(RCC->CR & RCC_CR_HSERDY_READY));
+
+  // Disable PLL before changing settings as documentation state
+  // "These bits should be written only if PLL is disabled."
+  RCC->CR &= ~RCC_CR_PLLON_ON;
+
+  // Set HSE as PLL source
+  RCC->PLLCFGR |= RCC_PLLCFGR_PLLSRC_HSE;
+
+  // Settings to achieve system clock of 96Mhz
+  RCC->PLLCFGR |= RCC_PLLCFGR_PLLM(25) | RCC_PLLCFGR_PLLN(196) | RCC_PLLCFGR_PLLP(2) | RCC_PLLCFGR_PLLQ(4);
+
+  // Set AHB prescalar to /1
+  RCC->CFGR &= ~(RCC_CFGR_HPRE_MASK << RCC_CFGR_HPRE_BIT);
+  RCC->CFGR |= (RCC_CFGR_HPRE_DIV_NONE << RCC_CFGR_HPRE_BIT);
+
+  // Set APB1 prescalar to /2
+  RCC->CFGR &= ~(RCC_CFGR_PPRE1_MASK << RCC_CFGR_PPRE1_BIT);
+  RCC->CFGR |= (RCC_CFGR_PPRE_DIV_2 << RCC_CFGR_PPRE1_BIT);
+
+  // Set APB2 prescalar to /1
+  RCC->CFGR &= ~(RCC_CFGR_PPRE2_MASK << RCC_CFGR_PPRE2_BIT);
+  RCC->CFGR |= (RCC_CFGR_PPRE_DIV_NONE << RCC_CFGR_PPRE2_BIT);
+
+  // Turn PLL back on
+  RCC->CR |= RCC_CR_PLLON_ON;
+
+  // Wait indefinitely for PLL to be ready
+  // TODO indicate error/timeout somehow?
+  while (!(RCC->CR & RCC_CR_HSERDY_READY));
+
+  // Enable caching of instructions and data
+  FLASH->ACR |= FLASH_ACR_DCEN_ENABLE;
+  FLASH->ACR |= FLASH_ACR_ICEN_ENABLE;
+
+  // Set latency to be 3 wait states (TODO: understand why exactly 3)
+  FLASH->ACR &= ~(FLASH_ACR_LATENCY_MASK << FLASH_ACR_LATENCY_BIT);
+  RCC->CFGR |= (FLASH_ACR_LATENCY_3_WAIT_STATES << FLASH_ACR_LATENCY_BIT);
+
+  // Use PLL as system clock
+  RCC->CFGR &= ~(RCC_CFGR_SW_MASK << RCC_CFGR_SW_BIT);
+  RCC->CFGR |= (RCC_CFGR_SW_PLL << RCC_CFGR_SW_BIT);
+
+  // Wait indefinitely for PLL clock to be selected
+  // TODO indicate error/timeout somehow?
+  while (((RCC->CFGR >> RCC_CFGR_SWS_BIT) & RCC_CFGR_SWS_MASK) != RCC_CFGR_SWS_PLL);
+
+  // Turn off HSI (which is on by default)
+  RCC->CR &= ~RCC_CR_HSION_ON;
+}
+
 static inline void spin(volatile uint32_t count) {
   while (count--) (void) 0;
 }
 
 int main(void) {
+  (void) system_clock_init();
+
   uint16_t led = PIN('C', 13);           // Blue LED
   RCC->AHB1ENR |= BIT(PINPORT(led));     // Enable GPIO clock for LED
   gpio_set_mode(led, GPIO_MODE_OUTPUT);  // Set blue LED to output mode
diff --git a/src/pwr.h b/src/pwr.h
new file mode 100644
index 0000000..3bbd6d2
--- /dev/null
+++ b/src/pwr.h
@@ -0,0 +1,22 @@
+#ifndef PWR_H_
+#define PWR_H_
+
+#include <inttypes.h>
+
+struct pwr {
+  volatile uint32_t CR;   // Power control register
+  volatile uint32_t CSR;  // Power control/status registe
+};
+
+#define PWR_BASE_ADDR (0x40007000U)
+#define PWR ((struct pwr *) PWR_BASE_ADDR)
+
+// Power control register
+#define PWR_SCALE3 (0b11)
+
+// Regulator voltage scaling output selection
+#define PWR_CR_VOS_BIT 14 // Bits [15:14]
+#define PWR_CR_VOS_MASK (0b11)
+#define PWR_CR_VOS(scale) ((scale & PWR_CR_VOS_MASK) << PWR_CR_VOS_BIT)
+
+#endif
diff --git a/src/rcc.h b/src/rcc.h
index bfd657e..5fcb8b5 100644
--- a/src/rcc.h
+++ b/src/rcc.h
@@ -44,13 +44,8 @@ struct rcc {
 
 // PLL toggle
 #define RCC_CR_PLLON_BIT 24
-#define RCC_CR_PLLON_OFF (0 << RCC_CR_PLLON_BIT)
 #define RCC_CR_PLLON_ON  (1 << RCC_CR_PLLON_BIT)
 
-// HSE clock bypass
-#define RCC_CR_HSEBYP_BIT 18
-#define RCC_CR_HSEBYP (1 << RCC_CR_HSEBYP_BIT)
-
 // HSE clock ready flag
 #define RCC_CR_HSERDY_BIT 17
 #define RCC_CR_HSERDY_READY (1 << RCC_CR_HSERDY_BIT)
@@ -59,8 +54,13 @@ struct rcc {
 #define RCC_CR_HSEON_BIT 16
 #define RCC_CR_HSEON_ON (1 << RCC_CR_HSEON_BIT)
 
+// HSI clock ready flag
+#define RCC_CR_HSIRDY_BIT 1
+#define RCC_CR_HSIRDY_READY (1 << RCC_CR_HSIRDY_BIT)
+
+// HSI clock enable
 #define RCC_CR_HSION_BIT 0
-#define RCC_CR_HSION_OFF (0 << RCC_CR_HSION_BIT)
+#define RCC_CR_HSION_ON  (1 << RCC_CR_HSION_BIT)
 
 // PLLCFGR Register
 #define RCC_PLLCFGR_PLLQ_BIT 24 // Bits [27:24]
@@ -114,4 +114,8 @@ struct rcc {
 #define RCC_CFGR_SW_MASK (0b11)
 #define RCC_CFGR_SW(clock) ((clock & RCC_CFGR_SW_MASK) << RCC_CFGR_SW_BIT)
 
+// APB1ENR Register
+#define RCC_APB1ENR_PWREN_BIT 28
+#define RCC_APB1ENR_PWREN_CLOCK_ENABLE (1 << RCC_APB1ENR_PWREN_BIT)
+
 #endif