From 4600e8e838cb4a717b77fb7ef3c3d41b8be3aae5 Mon Sep 17 00:00:00 2001
From: Alexander Heldt <me@alexanderheldt.se>
Date: Wed, 1 Jan 2025 12:40:01 +0100
Subject: [PATCH] Disable `FLASH` wait states

As it blocks the mc from reaching a ready state for unknown reason(s)
---
 build/final.elf     | Bin 62296 -> 62256 bytes
 build/final.elf.map | 228 ++++++++++++++++++++++----------------------
 build/main.S        |  97 ++++++++-----------
 build/main.i        |  15 +--
 build/main.o        | Bin 50452 -> 50412 bytes
 src/flash.h         |   2 +-
 src/main.c          |   5 +-
 7 files changed, 167 insertions(+), 180 deletions(-)

diff --git a/build/final.elf b/build/final.elf
index 6ce76be4c9892667cdbc9c244a1abe97147f9dcb..831ee91ea1f41182a370ec044683149a512ae8e9 100755
GIT binary patch
delta 4486
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zFfhQ_bfoK1orLa08uCFNW?<N?CAf>R-qBk+$HB|_Lqo7|ioLgVhMkx47YAqI1RHPZ
z3~MiEFx$dgI>X#c`2!=faDu6~bcTtS^Opu=;RJ^LM&8mH%wHIc8MJ?1(D#<k(DPFM
z&`>O#pyM5#p$$^S9Gsx(9hITssp&23?46+IJv&3yOZmeG=E(`l-b!Ax6EY?zD0<J%
zQ1DXz@*sF}f}Hp43|WxI;K>Qn-m^2Lyp+ErI8RQH@D}%)oiRB<%v(A`6y)4uko7_!
z>pw6QgRBR!1wlHKg%kL_r8D@voWC#>3s1f;?8ulqSy9BCaqZ+t5nE~Q|EwMiAO8Me
z_Kwc_-Ei+Y!+r(}CI<!%28R`sH;RNa?wHIex>T9z-|r4~MG3e6-}U}6EAMXD-N6Lr
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z@Cq<7Fi0@&iD6)1;RA^)Ft$Z8FtG50*eZ;oAT<IYH5!ZuC&x=EGajAXtspyjfs~f&
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z?P3Sp#9p&mM)#s3BlF~Ueq!}Xi3|*^S{!i<46NGkK&0M<cm@Vm{RN>646H_m(F_c%
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z4ye*+44K?ewS%!_vSoEDqt4{{)sl=plXq4dFxG5-Rc#%)+3#v5$7I#3N~}o+28M>4
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NKC3b2Om_S%4gf~o-i81G

delta 4437
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z^&c3DLDqxV5+I$)!U<yD(ix&&&R-acg%gCmr89)Qlt1t@3n%b;&(7fSa{kg$?EHa|
zd2#}$_vB;3c8u|pSw+kl=TEj3v1R)EZ*q-@1mls(Q$@lVuS|X`vQ+uY-`^eViV|-B
zzbpJ>R^HvPyMqbLd+~QSR9s~9R?%{1M#sszk}DaPPrfg&?5Ur~z`(-2fPsNQfbmlt
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diff --git a/build/final.elf.map b/build/final.elf.map
index 85ca98d..216cb92 100644
--- a/build/final.elf.map
+++ b/build/final.elf.map
@@ -157,7 +157,7 @@ LOAD build/usart.o
                 0x08000000                interrupt_vector_table
                 0x08000198                        . = ALIGN (0x4)
 
-.text           0x08000198      0x53c
+.text           0x08000198      0x520
                 0x08000198                        . = ALIGN (0x4)
  *(.text)
  *(.text.*)
@@ -172,129 +172,129 @@ LOAD build/usart.o
                 0x08000292                gpio_write
  *fill*         0x080002de        0x2 
  .text.system_clock_init
-                0x080002e0      0x138 build/main.o
- .text.main     0x08000418       0x9c build/main.o
-                0x08000418                main
+                0x080002e0      0x11c build/main.o
+ .text.main     0x080003fc       0x9c build/main.o
+                0x080003fc                main
  .text.init_memory
-                0x080004b4       0x64 build/startup.o
-                0x080004b4                init_memory
- .text.reset    0x08000518       0x10 build/startup.o
-                0x08000518                reset
+                0x08000498       0x64 build/startup.o
+                0x08000498                init_memory
+ .text.reset    0x080004fc       0x10 build/startup.o
+                0x080004fc                reset
  .text.default_handler
-                0x08000528        0x8 build/startup.o
-                0x08000528                exti0
-                0x08000528                debug_monitor
-                0x08000528                rcc
-                0x08000528                x
-                0x08000528                sdio
-                0x08000528                usage_fault
-                0x08000528                tim1_up_tim10
-                0x08000528                usart1
-                0x08000528                i2c3_er
-                0x08000528                spi2
-                0x08000528                dma1_stream1
-                0x08000528                bus_fault
-                0x08000528                spi5
-                0x08000528                exti3
-                0x08000528                dma2_stream5
-                0x08000528                tim2
-                0x08000528                dma1_stream6
-                0x08000528                default_handler
-                0x08000528                i2c1_er
-                0x08000528                hard_fault
-                0x08000528                usart6
-                0x08000528                exti15_10
-                0x08000528                usart2
-                0x08000528                pend_sv
-                0x08000528                i2c1_ev
-                0x08000528                wwdg
-                0x08000528                adc
-                0x08000528                rtc_alarm
-                0x08000528                spi3
-                0x08000528                exti1
-                0x08000528                mem_manage
-                0x08000528                dma2_stream1
-                0x08000528                dma1_stream2
-                0x08000528                dma2_stream3
-                0x08000528                sv_call
-                0x08000528                tim3
-                0x08000528                otg_fs
-                0x08000528                dma1_stream5
-                0x08000528                dma2_stream6
-                0x08000528                flash
-                0x08000528                tamp_stamp
-                0x08000528                i2c3_ev
-                0x08000528                rtc_wkup
-                0x08000528                dma2_stream0
-                0x08000528                pvd
-                0x08000528                fpu
-                0x08000528                exti4
-                0x08000528                exti2
-                0x08000528                spi1
-                0x08000528                dma1_stream0
-                0x08000528                tim1_brk_tim9
-                0x08000528                i2c2_ev
-                0x08000528                otg_fs_wkup
-                0x08000528                spi4
-                0x08000528                dma2_stream2
-                0x08000528                tim1_cc
-                0x08000528                tim1_trg_com_tim11
-                0x08000528                exti9_5
-                0x08000528                dma1_stream3
-                0x08000528                dma2_stream4
-                0x08000528                i2c2_er
-                0x08000528                dma2_stream7
-                0x08000528                dma1_stream7
-                0x08000528                nmi
-                0x08000528                systick
-                0x08000528                tim4
-                0x08000528                tim5
-                0x08000528                dma1_stream4
+                0x0800050c        0x8 build/startup.o
+                0x0800050c                exti0
+                0x0800050c                debug_monitor
+                0x0800050c                rcc
+                0x0800050c                x
+                0x0800050c                sdio
+                0x0800050c                usage_fault
+                0x0800050c                tim1_up_tim10
+                0x0800050c                usart1
+                0x0800050c                i2c3_er
+                0x0800050c                spi2
+                0x0800050c                dma1_stream1
+                0x0800050c                bus_fault
+                0x0800050c                spi5
+                0x0800050c                exti3
+                0x0800050c                dma2_stream5
+                0x0800050c                tim2
+                0x0800050c                dma1_stream6
+                0x0800050c                default_handler
+                0x0800050c                i2c1_er
+                0x0800050c                hard_fault
+                0x0800050c                usart6
+                0x0800050c                exti15_10
+                0x0800050c                usart2
+                0x0800050c                pend_sv
+                0x0800050c                i2c1_ev
+                0x0800050c                wwdg
+                0x0800050c                adc
+                0x0800050c                rtc_alarm
+                0x0800050c                spi3
+                0x0800050c                exti1
+                0x0800050c                mem_manage
+                0x0800050c                dma2_stream1
+                0x0800050c                dma1_stream2
+                0x0800050c                dma2_stream3
+                0x0800050c                sv_call
+                0x0800050c                tim3
+                0x0800050c                otg_fs
+                0x0800050c                dma1_stream5
+                0x0800050c                dma2_stream6
+                0x0800050c                flash
+                0x0800050c                tamp_stamp
+                0x0800050c                i2c3_ev
+                0x0800050c                rtc_wkup
+                0x0800050c                dma2_stream0
+                0x0800050c                pvd
+                0x0800050c                fpu
+                0x0800050c                exti4
+                0x0800050c                exti2
+                0x0800050c                spi1
+                0x0800050c                dma1_stream0
+                0x0800050c                tim1_brk_tim9
+                0x0800050c                i2c2_ev
+                0x0800050c                otg_fs_wkup
+                0x0800050c                spi4
+                0x0800050c                dma2_stream2
+                0x0800050c                tim1_cc
+                0x0800050c                tim1_trg_com_tim11
+                0x0800050c                exti9_5
+                0x0800050c                dma1_stream3
+                0x0800050c                dma2_stream4
+                0x0800050c                i2c2_er
+                0x0800050c                dma2_stream7
+                0x0800050c                dma1_stream7
+                0x0800050c                nmi
+                0x0800050c                systick
+                0x0800050c                tim4
+                0x0800050c                tim5
+                0x0800050c                dma1_stream4
  .text.tim4_init
-                0x08000530       0x40 build/timer.o
-                0x08000530                tim4_init
+                0x08000514       0x40 build/timer.o
+                0x08000514                tim4_init
  .text.tim4_start
-                0x08000570       0x20 build/timer.o
-                0x08000570                tim4_start
+                0x08000554       0x20 build/timer.o
+                0x08000554                tim4_start
  .text.usart2_init
-                0x08000590       0xb8 build/usart.o
-                0x08000590                usart2_init
+                0x08000574       0xb8 build/usart.o
+                0x08000574                usart2_init
  .text.usart2_start
-                0x08000648       0x20 build/usart.o
-                0x08000648                usart2_start
+                0x0800062c       0x20 build/usart.o
+                0x0800062c                usart2_start
  .text.usart2_write_byte
-                0x08000668       0x30 build/usart.o
-                0x08000668                usart2_write_byte
+                0x0800064c       0x30 build/usart.o
+                0x0800064c                usart2_write_byte
  .text.usart2_write
-                0x08000698       0x2a build/usart.o
-                0x08000698                usart2_write
+                0x0800067c       0x2a build/usart.o
+                0x0800067c                usart2_write
  *(.rodata)
- *fill*         0x080006c2        0x2 
- .rodata        0x080006c4        0xf build/main.o
+ *fill*         0x080006a6        0x2 
+ .rodata        0x080006a8        0xf build/main.o
  *(.rodata.*)
-                0x080006d4                        . = ALIGN (0x4)
- *fill*         0x080006d3        0x1 
-                0x080006d4                        _data_addr = LOADADDR (.data)
+                0x080006b8                        . = ALIGN (0x4)
+ *fill*         0x080006b7        0x1 
+                0x080006b8                        _data_addr = LOADADDR (.data)
 
-.glue_7         0x080006d4        0x0
- .glue_7        0x080006d4        0x0 linker stubs
+.glue_7         0x080006b8        0x0
+ .glue_7        0x080006b8        0x0 linker stubs
 
-.glue_7t        0x080006d4        0x0
- .glue_7t       0x080006d4        0x0 linker stubs
+.glue_7t        0x080006b8        0x0
+ .glue_7t       0x080006b8        0x0 linker stubs
 
-.vfp11_veneer   0x080006d4        0x0
- .vfp11_veneer  0x080006d4        0x0 linker stubs
+.vfp11_veneer   0x080006b8        0x0
+ .vfp11_veneer  0x080006b8        0x0 linker stubs
 
-.v4_bx          0x080006d4        0x0
- .v4_bx         0x080006d4        0x0 linker stubs
+.v4_bx          0x080006b8        0x0
+ .v4_bx         0x080006b8        0x0 linker stubs
 
-.iplt           0x080006d4        0x0
- .iplt          0x080006d4        0x0 build/main.o
+.iplt           0x080006b8        0x0
+ .iplt          0x080006b8        0x0 build/main.o
 
-.rel.dyn        0x080006d4        0x0
- .rel.iplt      0x080006d4        0x0 build/main.o
+.rel.dyn        0x080006b8        0x0
+ .rel.iplt      0x080006b8        0x0 build/main.o
 
-.data           0x20000000        0x0 load address 0x080006d4
+.data           0x20000000        0x0 load address 0x080006b8
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _data_start = .
  *(.data)
@@ -302,10 +302,10 @@ LOAD build/usart.o
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _data_end = .
 
-.igot.plt       0x20000000        0x0 load address 0x080006d4
+.igot.plt       0x20000000        0x0 load address 0x080006b8
  .igot.plt      0x20000000        0x0 build/main.o
 
-.bss            0x20000000        0x0 load address 0x080006d4
+.bss            0x20000000        0x0 load address 0x080006b8
                 0x20000000                        . = ALIGN (0x4)
                 0x20000000                        _bss_start = .
  *(.bss)
@@ -384,12 +384,12 @@ LOAD linker stubs
  .debug_macro   0x00003c9f      0xb74 build/usart.o
  .debug_macro   0x00004813       0x40 build/usart.o
 
-.debug_line     0x00000000      0x69d
+.debug_line     0x00000000      0x691
  .debug_line    0x00000000      0x179 build/gpio.o
- .debug_line    0x00000179      0x1de build/main.o
- .debug_line    0x00000357       0xea build/startup.o
- .debug_line    0x00000441       0xdf build/timer.o
- .debug_line    0x00000520      0x17d build/usart.o
+ .debug_line    0x00000179      0x1d2 build/main.o
+ .debug_line    0x0000034b       0xea build/startup.o
+ .debug_line    0x00000435       0xdf build/timer.o
+ .debug_line    0x00000514      0x17d build/usart.o
 
 .debug_str      0x00000000     0x626f
  .debug_str     0x00000000     0x53d8 build/gpio.o
diff --git a/build/main.S b/build/main.S
index 0ede322..0801bcb 100644
--- a/build/main.S
+++ b/build/main.S
@@ -175,42 +175,27 @@ system_clock_init:
 	.loc 1 62 41
 	orr	r3, r3, #512
 	str	r3, [r2]
-	.loc 1 65 35
-	ldr	r3, .L5+12
-	ldr	r3, [r3]
-	ldr	r2, .L5+12
-	.loc 1 65 41
-	bic	r3, r3, #15
-	str	r3, [r2]
-	.loc 1 66 33
+	.loc 1 70 33
 	ldr	r3, .L5
 	ldr	r3, [r3, #8]
 	ldr	r2, .L5
-	.loc 1 66 40
-	orr	r3, r3, #272
-	orr	r3, r3, #1
-	str	r3, [r2, #8]
-	.loc 1 69 33
-	ldr	r3, .L5
-	ldr	r3, [r3, #8]
-	ldr	r2, .L5
-	.loc 1 69 40
+	.loc 1 70 40
 	orr	r3, r3, #2
 	str	r3, [r2, #8]
-	.loc 1 73 9
+	.loc 1 74 9
 	nop
 .L4:
-	.loc 1 73 42 discriminator 1
+	.loc 1 74 42 discriminator 1
 	ldr	r3, .L5
 	ldr	r3, [r3, #8]
-	.loc 1 73 49 discriminator 1
+	.loc 1 74 49 discriminator 1
 	lsrs	r3, r3, #2
-	.loc 1 73 55 discriminator 1
+	.loc 1 74 55 discriminator 1
 	and	r3, r3, #3
-	.loc 1 73 65 discriminator 1
+	.loc 1 74 65 discriminator 1
 	cmp	r3, #2
 	bne	.L4
-	.loc 1 74 1
+	.loc 1 75 1
 	nop
 	nop
 	mov	sp, r7
@@ -243,7 +228,7 @@ system_clock_init:
 	.type	main, %function
 main:
 .LFB1:
-	.loc 1 76 16
+	.loc 1 77 16
 	.cfi_startproc
 	@ args = 0, pretend = 0, frame = 8
 	@ frame_needed = 1, uses_anonymous_args = 0
@@ -255,60 +240,60 @@ main:
 	.cfi_def_cfa_offset 16
 	add	r7, sp, #0
 	.cfi_def_cfa_register 7
-	.loc 1 77 3
-	bl	system_clock_init
 	.loc 1 78 3
-	bl	tim4_init
+	bl	system_clock_init
 	.loc 1 79 3
+	bl	tim4_init
+	.loc 1 80 3
 	bl	usart2_init
-	.loc 1 81 3
-	bl	tim4_start
 	.loc 1 82 3
+	bl	tim4_start
+	.loc 1 83 3
 	bl	usart2_start
-	.loc 1 84 12
+	.loc 1 85 12
 	movw	r3, #525
 	strh	r3, [r7, #2]	@ movhi
-	.loc 1 85 33
+	.loc 1 86 33
 	ldr	r3, .L10
 	ldr	r3, [r3, #48]
-	.loc 1 85 57
+	.loc 1 86 57
 	ldrh	r2, [r7, #2]
 	lsrs	r2, r2, #8
 	uxth	r2, r2
 	mov	r1, r2
-	.loc 1 85 49
+	.loc 1 86 49
 	movs	r2, #1
 	lsls	r2, r2, r1
 	mov	r1, r2
-	.loc 1 85 33
+	.loc 1 86 33
 	ldr	r2, .L10
-	.loc 1 85 43
+	.loc 1 86 43
 	orrs	r3, r3, r1
 	str	r3, [r2, #48]
-	.loc 1 86 3
+	.loc 1 87 3
 	ldrh	r3, [r7, #2]
 	movs	r1, #1
 	mov	r0, r3
 	bl	gpio_set_mode
-	.loc 1 88 54
+	.loc 1 89 54
 	ldr	r3, .L10+4
 	ldr	r3, [r3, #36]
-	.loc 1 88 12
+	.loc 1 89 12
 	strh	r3, [r7, #6]	@ movhi
-	.loc 1 89 7
+	.loc 1 90 7
 	movs	r3, #0
 	strb	r3, [r7, #5]
 .L9:
-	.loc 1 91 39
+	.loc 1 92 39
 	ldr	r3, .L10+4
 	ldr	r2, [r3, #36]
-	.loc 1 91 45
+	.loc 1 92 45
 	ldrh	r3, [r7, #6]
 	subs	r3, r2, r3
-	.loc 1 91 5
+	.loc 1 92 5
 	cmp	r3, #249
 	bls	.L9
-	.loc 1 92 3
+	.loc 1 93 3
 	ldrb	r3, [r7, #5]	@ zero_extendqisi2
 	cmp	r3, #0
 	ite	ne
@@ -317,26 +302,26 @@ main:
 	uxtb	r3, r3
 	eor	r3, r3, #1
 	uxtb	r3, r3
-	.loc 1 92 10
+	.loc 1 93 10
 	strb	r3, [r7, #5]
 	ldrb	r3, [r7, #5]
 	and	r3, r3, #1
 	strb	r3, [r7, #5]
-	.loc 1 93 3
+	.loc 1 94 3
 	ldrb	r2, [r7, #5]	@ zero_extendqisi2
 	ldrh	r3, [r7, #2]
 	mov	r1, r2
 	mov	r0, r3
 	bl	gpio_write
-	.loc 1 95 3
+	.loc 1 96 3
 	ldr	r0, .L10+8
 	bl	usart2_write
-	.loc 1 97 45
+	.loc 1 98 45
 	ldr	r3, .L10+4
 	ldr	r3, [r3, #36]
-	.loc 1 97 11
+	.loc 1 98 11
 	strh	r3, [r7, #6]	@ movhi
-	.loc 1 91 5
+	.loc 1 92 5
 	b	.L9
 .L11:
 	.align	2
@@ -893,7 +878,7 @@ main:
 	.uleb128 0x13
 	.4byte	.LASF1036
 	.byte	0x1
-	.byte	0x4c
+	.byte	0x4d
 	.byte	0x5
 	.4byte	0x7a
 	.4byte	.LFB1
@@ -904,7 +889,7 @@ main:
 	.uleb128 0x14
 	.ascii	"led\000"
 	.byte	0x1
-	.byte	0x54
+	.byte	0x55
 	.byte	0xc
 	.4byte	0x88
 	.uleb128 0x2
@@ -912,7 +897,7 @@ main:
 	.sleb128 -14
 	.uleb128 0xc
 	.4byte	.LASF1031
-	.byte	0x58
+	.byte	0x59
 	.byte	0xc
 	.4byte	0x88
 	.uleb128 0x2
@@ -920,7 +905,7 @@ main:
 	.sleb128 -10
 	.uleb128 0xc
 	.4byte	.LASF1032
-	.byte	0x59
+	.byte	0x5a
 	.byte	0x7
 	.4byte	0x3ec
 	.uleb128 0x2
@@ -4321,7 +4306,7 @@ main:
 	.uleb128 0x24
 	.4byte	.LASF924
 	.byte	0
-	.section	.debug_macro,"G",%progbits,wm4.flash.h.2.51d6f0499046dca8c8d7cee08875e55f,comdat
+	.section	.debug_macro,"G",%progbits,wm4.flash.h.2.f966f6c905ff507203ee6a1fd62d64ef,comdat
 .Ldebug_macro17:
 	.2byte	0x5
 	.byte	0
@@ -5138,8 +5123,6 @@ main:
 	.ascii	"_END_STD_C \000"
 .LASF852:
 	.ascii	"true ((_Bool)+1u)\000"
-.LASF932:
-	.ascii	"FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)\000"
 .LASF599:
 	.ascii	"UINT_LEAST16_MAX (__UINT_LEAST16_MAX__)\000"
 .LASF123:
@@ -6550,6 +6533,8 @@ main:
 	.ascii	"__ARM_FEATURE_CDE_COPROC\000"
 .LASF765:
 	.ascii	"PRIoLEAST32 __PRI32LEAST(o)\000"
+.LASF932:
+	.ascii	"FLASH_ACR_LATENCY_3_WAIT_STATES (0b0011)\000"
 .LASF91:
 	.ascii	"__INTMAX_C(c) c ## LL\000"
 	.ident	"GCC: (Arm GNU Toolchain 12.3.Rel1 (Build arm-12.35)) 12.3.1 20230626"
diff --git a/build/main.i b/build/main.i
index bc9dacc..b3de752 100644
--- a/build/main.i
+++ b/build/main.i
@@ -2200,7 +2200,7 @@ struct flash {
 #define FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)
 
 
-#define FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)
+#define FLASH_ACR_LATENCY_3_WAIT_STATES (0b0011)
 
 #define FLASH_ACR_LATENCY_BIT 0
 #define FLASH_ACR_LATENCY_MASK (0b1111)
@@ -2371,8 +2371,9 @@ static void system_clock_init(void) {
   ((struct flash *) (0x40023C00U))->ACR |= (1 <<9);
 
 
-  ((struct flash *) (0x40023C00U))->ACR &= ~((0b1111) << 0);
-  ((struct rcc *) (0x40023800U))->CFGR |= ((0x0111) << 0);
+
+
+
 
 
   ((struct rcc *) (0x40023800U))->CFGR |= (((0b10) & (0b11)) << 0);
@@ -2396,13 +2397,13 @@ int main(void) {
 
   uint16_t counter = ((struct timer *) (0x40000800U))->CNT;
   
-# 89 "src/main.c" 3 4
+# 90 "src/main.c" 3 4
  _Bool 
-# 89 "src/main.c"
+# 90 "src/main.c"
       led_on = 
-# 89 "src/main.c" 3 4
+# 90 "src/main.c" 3 4
                ((_Bool)+0u)
-# 89 "src/main.c"
+# 90 "src/main.c"
                     ;
   while(1) {
  if ((((struct timer *) (0x40000800U))->CNT - counter) >= 250) {
diff --git a/build/main.o b/build/main.o
index 7cec1a07ccb52dfb4d17a6e6d410f053c681874b..bbbf9b4b30c6cdf4aac91563a5e6bd5616e51c53 100644
GIT binary patch
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diff --git a/src/flash.h b/src/flash.h
index aa17358..6201b15 100644
--- a/src/flash.h
+++ b/src/flash.h
@@ -25,7 +25,7 @@ struct flash {
 #define FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)
 
 // Latency
-#define FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)
+#define FLASH_ACR_LATENCY_3_WAIT_STATES (0b0011)
 
 #define FLASH_ACR_LATENCY_BIT 0 // Bits [3:0]
 #define FLASH_ACR_LATENCY_MASK (0b1111)
diff --git a/src/main.c b/src/main.c
index 634d4d0..37fa33f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -61,9 +61,10 @@ static void system_clock_init(void) {
   FLASH->ACR |= FLASH_ACR_DCEN_ENABLE;
   FLASH->ACR |= FLASH_ACR_ICEN_ENABLE;
 
+  // TODO breaks with these flash settings on; turning off for now
   // 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);
+  /* 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(RCC_CFGR_SW_PLL);