diff --git a/build/final.elf b/build/final.elf
index e72a153..b9785a1 100755
Binary files a/build/final.elf and b/build/final.elf differ
diff --git a/build/final.elf.map b/build/final.elf.map
index 97283df..5718856 100644
--- a/build/final.elf.map
+++ b/build/final.elf.map
@@ -52,7 +52,7 @@ Discarded input sections
  .debug_macro   0x00000000       0x89 build/main.o
  .debug_macro   0x00000000      0x4cc build/main.o
  .debug_macro   0x00000000       0x22 build/main.o
- .debug_macro   0x00000000       0x2e build/main.o
+ .debug_macro   0x00000000       0x34 build/main.o
  .group         0x00000000        0xc build/startup.o
  .group         0x00000000        0xc build/startup.o
  .group         0x00000000        0xc build/startup.o
@@ -294,7 +294,7 @@ LOAD linker stubs
  .debug_rnglists
                 0x00000053       0x19 build/timer.o
 
-.debug_macro    0x00000000     0x3b9a
+.debug_macro    0x00000000     0x3ba0
  .debug_macro   0x00000000      0xb56 build/gpio.o
  .debug_macro   0x00000b56       0x22 build/gpio.o
  .debug_macro   0x00000b78       0x75 build/gpio.o
@@ -309,17 +309,17 @@ LOAD linker stubs
  .debug_macro   0x0000108c       0x89 build/gpio.o
  .debug_macro   0x00001115      0x4cc build/gpio.o
  .debug_macro   0x000015e1       0x22 build/gpio.o
- .debug_macro   0x00001603       0x2e build/gpio.o
- .debug_macro   0x00001631      0xb80 build/main.o
- .debug_macro   0x000021b1      0x12a build/main.o
- .debug_macro   0x000022db       0x46 build/main.o
- .debug_macro   0x00002321       0x2e build/main.o
- .debug_macro   0x0000234f       0x22 build/main.o
- .debug_macro   0x00002371      0xb02 build/startup.o
- .debug_macro   0x00002e73       0x56 build/startup.o
- .debug_macro   0x00002ec9       0x51 build/startup.o
- .debug_macro   0x00002f1a      0xb5c build/timer.o
- .debug_macro   0x00003a76      0x124 build/timer.o
+ .debug_macro   0x00001603       0x34 build/gpio.o
+ .debug_macro   0x00001637      0xb80 build/main.o
+ .debug_macro   0x000021b7      0x12a build/main.o
+ .debug_macro   0x000022e1       0x46 build/main.o
+ .debug_macro   0x00002327       0x2e build/main.o
+ .debug_macro   0x00002355       0x22 build/main.o
+ .debug_macro   0x00002377      0xb02 build/startup.o
+ .debug_macro   0x00002e79       0x56 build/startup.o
+ .debug_macro   0x00002ecf       0x51 build/startup.o
+ .debug_macro   0x00002f20      0xb5c build/timer.o
+ .debug_macro   0x00003a7c      0x124 build/timer.o
 
 .debug_line     0x00000000      0x4b3
  .debug_line    0x00000000      0x116 build/gpio.o
@@ -327,14 +327,14 @@ LOAD linker stubs
  .debug_line    0x000002ea       0xea build/startup.o
  .debug_line    0x000003d4       0xdf build/timer.o
 
-.debug_str      0x00000000     0x5ea4
- .debug_str     0x00000000     0x535f build/gpio.o
-                               0x5507 (size before relaxing)
- .debug_str     0x0000535f      0xab1 build/main.o
-                               0x5f68 (size before relaxing)
- .debug_str     0x00005e10       0x88 build/startup.o
+.debug_str      0x00000000     0x5eba
+ .debug_str     0x00000000     0x5375 build/gpio.o
+                               0x551d (size before relaxing)
+ .debug_str     0x00005375      0xab1 build/main.o
+                               0x5f7e (size before relaxing)
+ .debug_str     0x00005e26       0x88 build/startup.o
                                0x3cdc (size before relaxing)
- .debug_str     0x00005e98        0xc build/timer.o
+ .debug_str     0x00005eae        0xc build/timer.o
                                0x5b16 (size before relaxing)
 
 .comment        0x00000000       0x45
diff --git a/build/gpio.S b/build/gpio.S
index 0b828f1..499cfd0 100644
--- a/build/gpio.S
+++ b/build/gpio.S
@@ -188,10 +188,10 @@ gpio_write:
 	.byte	0x4
 	.4byte	.Ldebug_abbrev0
 	.uleb128 0x8
-	.4byte	.LASF893
-	.byte	0x1d
 	.4byte	.LASF894
+	.byte	0x1d
 	.4byte	.LASF895
+	.4byte	.LASF896
 	.4byte	.LLRL0
 	.4byte	0
 	.4byte	.Ldebug_line0
@@ -199,17 +199,17 @@ gpio_write:
 	.uleb128 0x1
 	.byte	0x1
 	.byte	0x6
-	.4byte	.LASF862
+	.4byte	.LASF863
 	.uleb128 0x1
 	.byte	0x1
 	.byte	0x8
-	.4byte	.LASF863
+	.4byte	.LASF864
 	.uleb128 0x1
 	.byte	0x2
 	.byte	0x5
-	.4byte	.LASF864
+	.4byte	.LASF865
 	.uleb128 0x3
-	.4byte	.LASF867
+	.4byte	.LASF868
 	.byte	0x2
 	.byte	0x39
 	.byte	0x1c
@@ -217,13 +217,13 @@ gpio_write:
 	.uleb128 0x1
 	.byte	0x2
 	.byte	0x7
-	.4byte	.LASF865
+	.4byte	.LASF866
 	.uleb128 0x1
 	.byte	0x4
 	.byte	0x5
-	.4byte	.LASF866
+	.4byte	.LASF867
 	.uleb128 0x3
-	.4byte	.LASF868
+	.4byte	.LASF869
 	.byte	0x2
 	.byte	0x4f
 	.byte	0x1b
@@ -231,21 +231,21 @@ gpio_write:
 	.uleb128 0x1
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF869
-	.uleb128 0x1
-	.byte	0x8
-	.byte	0x5
 	.4byte	.LASF870
 	.uleb128 0x1
 	.byte	0x8
-	.byte	0x7
+	.byte	0x5
 	.4byte	.LASF871
+	.uleb128 0x1
+	.byte	0x8
+	.byte	0x7
+	.4byte	.LASF872
 	.uleb128 0x9
 	.byte	0x4
 	.byte	0x5
 	.ascii	"int\000"
 	.uleb128 0x3
-	.4byte	.LASF872
+	.4byte	.LASF873
 	.byte	0x2
 	.byte	0xe8
 	.byte	0x16
@@ -253,15 +253,15 @@ gpio_write:
 	.uleb128 0x1
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF873
-	.uleb128 0x3
 	.4byte	.LASF874
+	.uleb128 0x3
+	.4byte	.LASF875
 	.byte	0x3
 	.byte	0x24
 	.byte	0x14
 	.4byte	0x3f
 	.uleb128 0x3
-	.4byte	.LASF875
+	.4byte	.LASF876
 	.byte	0x3
 	.byte	0x30
 	.byte	0x14
@@ -269,35 +269,35 @@ gpio_write:
 	.uleb128 0xa
 	.4byte	0xa0
 	.uleb128 0x3
-	.4byte	.LASF876
+	.4byte	.LASF877
 	.byte	0x3
 	.byte	0x52
 	.byte	0x15
 	.4byte	0x81
 	.uleb128 0xb
-	.4byte	.LASF892
+	.4byte	.LASF893
 	.byte	0x28
 	.byte	0x4
 	.byte	0x7
 	.byte	0x8
 	.4byte	0x139
 	.uleb128 0x2
-	.4byte	.LASF877
+	.4byte	.LASF878
 	.byte	0x8
 	.4byte	0xac
 	.byte	0
 	.uleb128 0x2
-	.4byte	.LASF878
+	.4byte	.LASF879
 	.byte	0x9
 	.4byte	0xac
 	.byte	0x4
 	.uleb128 0x2
-	.4byte	.LASF879
+	.4byte	.LASF880
 	.byte	0xa
 	.4byte	0xac
 	.byte	0x8
 	.uleb128 0x2
-	.4byte	.LASF880
+	.4byte	.LASF881
 	.byte	0xb
 	.4byte	0xac
 	.byte	0xc
@@ -312,22 +312,22 @@ gpio_write:
 	.4byte	0xac
 	.byte	0x14
 	.uleb128 0x2
-	.4byte	.LASF881
+	.4byte	.LASF882
 	.byte	0xe
 	.4byte	0xac
 	.byte	0x18
 	.uleb128 0x2
-	.4byte	.LASF882
+	.4byte	.LASF883
 	.byte	0xf
 	.4byte	0xac
 	.byte	0x1c
 	.uleb128 0x2
-	.4byte	.LASF883
+	.4byte	.LASF884
 	.byte	0x10
 	.4byte	0xac
 	.byte	0x20
 	.uleb128 0x2
-	.4byte	.LASF884
+	.4byte	.LASF885
 	.byte	0x11
 	.4byte	0xac
 	.byte	0x24
@@ -337,30 +337,30 @@ gpio_write:
 	.byte	0x1
 	.4byte	0x31
 	.byte	0x4
-	.byte	0x1f
+	.byte	0x21
 	.byte	0xe
 	.4byte	0x160
 	.uleb128 0x4
-	.4byte	.LASF885
+	.4byte	.LASF886
 	.byte	0
 	.uleb128 0x4
-	.4byte	.LASF886
+	.4byte	.LASF887
 	.byte	0x1
 	.uleb128 0x4
-	.4byte	.LASF887
+	.4byte	.LASF888
 	.byte	0x2
 	.uleb128 0x4
-	.4byte	.LASF888
+	.4byte	.LASF889
 	.byte	0x3
 	.byte	0
 	.uleb128 0x3
-	.4byte	.LASF889
+	.4byte	.LASF890
 	.byte	0x4
-	.byte	0x24
+	.byte	0x26
 	.byte	0x3
 	.4byte	0x139
 	.uleb128 0xd
-	.4byte	.LASF896
+	.4byte	.LASF897
 	.byte	0x1
 	.byte	0xd
 	.byte	0x6
@@ -386,7 +386,7 @@ gpio_write:
 	.byte	0x91
 	.sleb128 -19
 	.uleb128 0x7
-	.4byte	.LASF892
+	.4byte	.LASF893
 	.byte	0xe
 	.4byte	0x1b3
 	.uleb128 0x2
@@ -396,12 +396,12 @@ gpio_write:
 	.uleb128 0x1
 	.byte	0x1
 	.byte	0x2
-	.4byte	.LASF890
+	.4byte	.LASF891
 	.uleb128 0xe
 	.byte	0x4
 	.4byte	0xbd
 	.uleb128 0xf
-	.4byte	.LASF897
+	.4byte	.LASF898
 	.byte	0x1
 	.byte	0x6
 	.byte	0x6
@@ -418,7 +418,7 @@ gpio_write:
 	.byte	0x91
 	.sleb128 -18
 	.uleb128 0x10
-	.4byte	.LASF891
+	.4byte	.LASF892
 	.byte	0x1
 	.byte	0x6
 	.byte	0x2c
@@ -427,7 +427,7 @@ gpio_write:
 	.byte	0x91
 	.sleb128 -19
 	.uleb128 0x7
-	.4byte	.LASF892
+	.4byte	.LASF893
 	.byte	0x7
 	.4byte	0x1b3
 	.uleb128 0x2
@@ -3525,7 +3525,7 @@ gpio_write:
 	.uleb128 0x32
 	.4byte	.LASF854
 	.byte	0
-	.section	.debug_macro,"G",%progbits,wm4.gpio.h.2.ca8518d3facb6a329deaeb59004fd0a1,comdat
+	.section	.debug_macro,"G",%progbits,wm4.gpio.h.2.3af2911851c1c29c51024d0f06788d31,comdat
 .Ldebug_macro15:
 	.2byte	0x5
 	.byte	0
@@ -3550,6 +3550,9 @@ gpio_write:
 	.byte	0x5
 	.uleb128 0x1d
 	.4byte	.LASF861
+	.byte	0x5
+	.uleb128 0x1f
+	.4byte	.LASF862
 	.byte	0
 	.section	.debug_line,"",%progbits
 .Ldebug_line0:
@@ -3594,7 +3597,7 @@ gpio_write:
 	.ascii	"__PTRDIFF_MAX__ 0x7fffffff\000"
 .LASF541:
 	.ascii	"_LONG_DOUBLE long double\000"
-.LASF892:
+.LASF893:
 	.ascii	"gpio\000"
 .LASF591:
 	.ascii	"INT_LEAST8_MIN (-__INT_LEAST8_MAX__ - 1)\000"
@@ -3602,7 +3605,7 @@ gpio_write:
 	.ascii	"_UINT32_T_DECLARED \000"
 .LASF90:
 	.ascii	"__INTMAX_MAX__ 0x7fffffffffffffffLL\000"
-.LASF887:
+.LASF888:
 	.ascii	"GPIO_MODE_AF\000"
 .LASF335:
 	.ascii	"__TQ_IBIT__ 0\000"
@@ -3716,7 +3719,7 @@ gpio_write:
 	.ascii	"__need_wchar_t\000"
 .LASF199:
 	.ascii	"__FLT32_MIN_EXP__ (-125)\000"
-.LASF893:
+.LASF894:
 	.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"
@@ -3837,7 +3840,7 @@ gpio_write:
 	.ascii	"PRId64 __PRI64(d)\000"
 .LASF302:
 	.ascii	"__UACCUM_IBIT__ 16\000"
-.LASF866:
+.LASF867:
 	.ascii	"long int\000"
 .LASF818:
 	.ascii	"PRIXFAST64 __PRI64FAST(X)\000"
@@ -3933,7 +3936,7 @@ gpio_write:
 	.ascii	"PRIoLEAST16 __PRI16LEAST(o)\000"
 .LASF458:
 	.ascii	"__NEWLIB__ 4\000"
-.LASF885:
+.LASF886:
 	.ascii	"GPIO_MODE_INPUT\000"
 .LASF720:
 	.ascii	"SCNi16 __SCN16(i)\000"
@@ -3943,7 +3946,7 @@ gpio_write:
 	.ascii	"__FLT_DECIMAL_DIG__ 9\000"
 .LASF562:
 	.ascii	"_UINT8_T_DECLARED \000"
-.LASF862:
+.LASF863:
 	.ascii	"signed char\000"
 .LASF805:
 	.ascii	"PRIuLEAST64 __PRI64LEAST(u)\000"
@@ -3955,7 +3958,7 @@ gpio_write:
 	.ascii	"__ARM_FEATURE_FMA 1\000"
 .LASF364:
 	.ascii	"__GNUC_STDC_INLINE__ 1\000"
-.LASF889:
+.LASF890:
 	.ascii	"GPIO_MODE\000"
 .LASF256:
 	.ascii	"__FRACT_FBIT__ 15\000"
@@ -3979,7 +3982,7 @@ gpio_write:
 	.ascii	"__FLT64_MAX_10_EXP__ 308\000"
 .LASF65:
 	.ascii	"__UINT_FAST32_TYPE__ unsigned int\000"
-.LASF863:
+.LASF864:
 	.ascii	"unsigned char\000"
 .LASF3:
 	.ascii	"__STDC_UTF_32__ 1\000"
@@ -4027,13 +4030,13 @@ gpio_write:
 	.ascii	"__int_fast64_t_defined 1\000"
 .LASF837:
 	.ascii	"__PRIPTR(x) __STRINGIFY(x)\000"
-.LASF874:
+.LASF875:
 	.ascii	"uint16_t\000"
 .LASF417:
 	.ascii	"__thumb2__ 1\000"
 .LASF321:
 	.ascii	"__ULLACCUM_FBIT__ 32\000"
-.LASF890:
+.LASF891:
 	.ascii	"_Bool\000"
 .LASF366:
 	.ascii	"__STRICT_ANSI__ 1\000"
@@ -4051,7 +4054,9 @@ gpio_write:
 	.ascii	"__PRAGMA_REDEFINE_EXTNAME 1\000"
 .LASF36:
 	.ascii	"__WCHAR_TYPE__ unsigned int\000"
-.LASF886:
+.LASF859:
+	.ascii	"PORT(port) (((port) - 'A') << 8)\000"
+.LASF887:
 	.ascii	"GPIO_MODE_OUTPUT\000"
 .LASF357:
 	.ascii	"__USA_IBIT__ 16\000"
@@ -4089,7 +4094,7 @@ gpio_write:
 	.ascii	"__SCN64(x) __INT64 __STRINGIFY(x)\000"
 .LASF646:
 	.ascii	"_GCC_WRAP_STDINT_H \000"
-.LASF867:
+.LASF868:
 	.ascii	"__uint16_t\000"
 .LASF224:
 	.ascii	"__FLT64_EPSILON__ 2.2204460492503131e-16F64\000"
@@ -4145,8 +4150,6 @@ gpio_write:
 	.ascii	"__FLT_EPSILON__ 1.1920928955078125e-7F\000"
 .LASF376:
 	.ascii	"__GCC_ATOMIC_SHORT_LOCK_FREE 2\000"
-.LASF859:
-	.ascii	"PIN(port,num) ((((port) - 'A') << 8) | num)\000"
 .LASF806:
 	.ascii	"PRIxLEAST64 __PRI64LEAST(x)\000"
 .LASF419:
@@ -4301,7 +4304,7 @@ gpio_write:
 	.ascii	"___int8_t_defined 1\000"
 .LASF248:
 	.ascii	"__SFRACT_MIN__ (-0.5HR-0.5HR)\000"
-.LASF869:
+.LASF870:
 	.ascii	"long unsigned int\000"
 .LASF349:
 	.ascii	"__SA_IBIT__ 16\000"
@@ -4317,7 +4320,7 @@ gpio_write:
 	.ascii	"__ARM_FP16_FORMAT_IEEE\000"
 .LASF48:
 	.ascii	"__UINT16_TYPE__ short unsigned int\000"
-.LASF896:
+.LASF897:
 	.ascii	"gpio_write\000"
 .LASF569:
 	.ascii	"__int32_t_defined 1\000"
@@ -4361,7 +4364,7 @@ gpio_write:
 	.ascii	"SCNx8 __SCN8(x)\000"
 .LASF208:
 	.ascii	"__FLT32_DENORM_MIN__ 1.4012984643248171e-45F32\000"
-.LASF897:
+.LASF898:
 	.ascii	"gpio_set_mode\000"
 .LASF125:
 	.ascii	"__UINT64_C(c) c ## ULL\000"
@@ -4381,7 +4384,7 @@ gpio_write:
 	.ascii	"__GCC_ATOMIC_CHAR16_T_LOCK_FREE 2\000"
 .LASF789:
 	.ascii	"__PRI64FAST(x) __FAST64 __STRINGIFY(x)\000"
-.LASF876:
+.LASF877:
 	.ascii	"uintptr_t\000"
 .LASF168:
 	.ascii	"__DBL_MAX_EXP__ 1024\000"
@@ -4429,7 +4432,7 @@ gpio_write:
 	.ascii	"PRIX32 __PRI32(X)\000"
 .LASF773:
 	.ascii	"SCNxLEAST32 __SCN32LEAST(x)\000"
-.LASF879:
+.LASF880:
 	.ascii	"OSPEEDR\000"
 .LASF711:
 	.ascii	"__SCN16LEAST(x) __LEAST16 __STRINGIFY(x)\000"
@@ -4459,7 +4462,7 @@ gpio_write:
 	.ascii	"__ULACCUM_MIN__ 0.0ULK\000"
 .LASF461:
 	.ascii	"_ATEXIT_DYNAMIC_ALLOC 1\000"
-.LASF868:
+.LASF869:
 	.ascii	"__uint32_t\000"
 .LASF188:
 	.ascii	"__LDBL_MAX__ 1.7976931348623157e+308L\000"
@@ -4469,7 +4472,7 @@ gpio_write:
 	.ascii	"__FLT_RADIX__ 2\000"
 .LASF454:
 	.ascii	"_INTTYPES_H \000"
-.LASF870:
+.LASF871:
 	.ascii	"long long int\000"
 .LASF401:
 	.ascii	"__ARM_FEATURE_CMSE\000"
@@ -4574,7 +4577,7 @@ gpio_write:
 	.ascii	"\000"
 .LASF582:
 	.ascii	"__int_fast16_t_defined 1\000"
-.LASF877:
+.LASF878:
 	.ascii	"MODER\000"
 .LASF482:
 	.ascii	"__FLOAT_TYPE float\000"
@@ -4585,9 +4588,9 @@ gpio_write:
 	.ascii	"L)\000"
 .LASF607:
 	.ascii	"INT64_MAX (__INT64_MAX__)\000"
-.LASF873:
+.LASF874:
 	.ascii	"unsigned int\000"
-.LASF872:
+.LASF873:
 	.ascii	"__uintptr_t\000"
 .LASF459:
 	.ascii	"__NEWLIB_MINOR__ 3\000"
@@ -4619,7 +4622,7 @@ gpio_write:
 	.ascii	"__CHAR_BIT__ 8\000"
 .LASF143:
 	.ascii	"__FLT_EVAL_METHOD__ 0\000"
-.LASF864:
+.LASF865:
 	.ascii	"short int\000"
 .LASF685:
 	.ascii	"PRIdLEAST8 __PRI8LEAST(d)\000"
@@ -4757,7 +4760,7 @@ gpio_write:
 	.ascii	"SCNuFAST16 __SCN16FAST(u)\000"
 .LASF801:
 	.ascii	"SCNx64 __SCN64(x)\000"
-.LASF861:
+.LASF862:
 	.ascii	"PINPORT(pin) (pin >> 8)\000"
 .LASF198:
 	.ascii	"__FLT32_DIG__ 6\000"
@@ -4805,7 +4808,7 @@ gpio_write:
 	.ascii	"__ORDER_LITTLE_ENDIAN__ 1234\000"
 .LASF155:
 	.ascii	"__FLT_NORM_MAX__ 3.4028234663852886e+38F\000"
-.LASF871:
+.LASF872:
 	.ascii	"long long unsigned int\000"
 .LASF611:
 	.ascii	"UINT_LEAST64_MAX (__UINT_LEAST64_MAX__)\000"
@@ -4883,11 +4886,11 @@ gpio_write:
 	.ascii	"SCNdFAST8 __SCN8FAST(d)\000"
 .LASF576:
 	.ascii	"_UINTPTR_T_DECLARED \000"
-.LASF884:
+.LASF885:
 	.ascii	"AFRH\000"
 .LASF314:
 	.ascii	"__ULACCUM_MAX__ 0XFFFFFFFFFFFFFFFFP-32ULK\000"
-.LASF883:
+.LASF884:
 	.ascii	"AFRL\000"
 .LASF273:
 	.ascii	"__ULFRACT_MIN__ 0.0ULR\000"
@@ -4901,7 +4904,7 @@ gpio_write:
 	.ascii	"__INT32_TYPE__ long int\000"
 .LASF118:
 	.ascii	"__UINT_LEAST8_MAX__ 0xff\000"
-.LASF882:
+.LASF883:
 	.ascii	"LCKR\000"
 .LASF520:
 	.ascii	"__int20__ +2\000"
@@ -4915,6 +4918,8 @@ gpio_write:
 	.ascii	"__SCN32(x) __INT32 __STRINGIFY(x)\000"
 .LASF743:
 	.ascii	"SCNoFAST16 __SCN16FAST(o)\000"
+.LASF860:
+	.ascii	"PIN(port,num) (PORT(port) | num)\000"
 .LASF345:
 	.ascii	"__UTQ_IBIT__ 0\000"
 .LASF348:
@@ -4947,7 +4952,7 @@ gpio_write:
 	.ascii	"__QQ_IBIT__ 0\000"
 .LASF763:
 	.ascii	"PRIdLEAST32 __PRI32LEAST(d)\000"
-.LASF878:
+.LASF879:
 	.ascii	"OTYPER\000"
 .LASF811:
 	.ascii	"SCNuLEAST64 __SCN64LEAST(u)\000"
@@ -4967,7 +4972,7 @@ gpio_write:
 	.ascii	"__GNUC_MINOR__ 3\000"
 .LASF57:
 	.ascii	"__UINT_LEAST32_TYPE__ long unsigned int\000"
-.LASF894:
+.LASF895:
 	.ascii	"src/gpio.c\000"
 .LASF405:
 	.ascii	"__ARM_FEATURE_NUMERIC_MAXMIN\000"
@@ -5041,7 +5046,7 @@ gpio_write:
 	.ascii	"__ACCUM_IBIT__ 16\000"
 .LASF509:
 	.ascii	"unsigned\000"
-.LASF880:
+.LASF881:
 	.ascii	"PUPDR\000"
 .LASF835:
 	.ascii	"SCNuMAX __SCNMAX(u)\000"
@@ -5051,7 +5056,7 @@ gpio_write:
 	.ascii	"_ATTRIBUTE(attrs) __attribute__ (attrs)\000"
 .LASF359:
 	.ascii	"__UDA_IBIT__ 32\000"
-.LASF891:
+.LASF892:
 	.ascii	"mode\000"
 .LASF586:
 	.ascii	"INTPTR_MAX (__INTPTR_MAX__)\000"
@@ -5065,7 +5070,7 @@ gpio_write:
 	.ascii	"__UHQ_FBIT__ 16\000"
 .LASF443:
 	.ascii	"__ARM_FEATURE_COPROC\000"
-.LASF888:
+.LASF889:
 	.ascii	"GPIO_MODE_ANALOG\000"
 .LASF177:
 	.ascii	"__DBL_HAS_INFINITY__ 1\000"
@@ -5103,7 +5108,7 @@ gpio_write:
 	.ascii	"__FAST8 \000"
 .LASF496:
 	.ascii	"__XSI_VISIBLE 0\000"
-.LASF881:
+.LASF882:
 	.ascii	"BSRR\000"
 .LASF794:
 	.ascii	"PRIu64 __PRI64(u)\000"
@@ -5191,7 +5196,7 @@ gpio_write:
 	.ascii	"PRIx32 __PRI32(x)\000"
 .LASF278:
 	.ascii	"__LLFRACT_MIN__ (-0.5LLR-0.5LLR)\000"
-.LASF875:
+.LASF876:
 	.ascii	"uint32_t\000"
 .LASF689:
 	.ascii	"PRIxLEAST8 __PRI8LEAST(x)\000"
@@ -5239,13 +5244,13 @@ gpio_write:
 	.ascii	"__INT_LEAST16_TYPE__ short int\000"
 .LASF326:
 	.ascii	"__QQ_FBIT__ 7\000"
-.LASF860:
+.LASF861:
 	.ascii	"PINNUM(pin) (pin & 0b1111)\000"
 .LASF768:
 	.ascii	"PRIXLEAST32 __PRI32LEAST(X)\000"
 .LASF171:
 	.ascii	"__DBL_MAX__ ((double)1.7976931348623157e+308L)\000"
-.LASF865:
+.LASF866:
 	.ascii	"short unsigned int\000"
 .LASF276:
 	.ascii	"__LLFRACT_FBIT__ 63\000"
@@ -5293,7 +5298,7 @@ gpio_write:
 	.ascii	"__SCN64LEAST(x) __LEAST64 __STRINGIFY(x)\000"
 .LASF280:
 	.ascii	"__LLFRACT_EPSILON__ 0x1P-63LLR\000"
-.LASF895:
+.LASF896:
 	.ascii	"/home/alex/code/own/stm32-falling-sand\000"
 .LASF249:
 	.ascii	"__SFRACT_MAX__ 0X7FP-7HR\000"
diff --git a/build/gpio.i b/build/gpio.i
index 348afd2..bd007eb 100644
--- a/build/gpio.i
+++ b/build/gpio.i
@@ -2004,7 +2004,9 @@ struct gpio {
 #define GPIO(port) ((struct gpio*)(uintptr_t)(GPIO_BASE_ADDR + (GPIO_PORT_OFFSET * port)))
 
 
-#define PIN(port,num) ((((port) - 'A') << 8) | num)
+#define PORT(port) (((port) - 'A') << 8)
+
+#define PIN(port,num) (PORT(port) | num)
 
 #define PINNUM(pin) (pin & 0b1111)
 
@@ -2019,9 +2021,9 @@ typedef enum {
 
 void gpio_set_mode(uint16_t pin, GPIO_MODE mode);
 void gpio_write(uint16_t pin, 
-# 39 "src/gpio.h" 3 4
+# 41 "src/gpio.h" 3 4
                              _Bool 
-# 39 "src/gpio.h"
+# 41 "src/gpio.h"
                                   val);
 # 5 "src/gpio.c" 2
 
diff --git a/build/gpio.o b/build/gpio.o
index 3483ab3..59a40c3 100644
Binary files a/build/gpio.o and b/build/gpio.o differ
diff --git a/build/main.S b/build/main.S
index 97dea73..72ecb9d 100644
--- a/build/main.S
+++ b/build/main.S
@@ -352,10 +352,10 @@ main:
 	.byte	0x4
 	.4byte	.Ldebug_abbrev0
 	.uleb128 0xd
-	.4byte	.LASF1001
-	.byte	0x1d
 	.4byte	.LASF1002
+	.byte	0x1d
 	.4byte	.LASF1003
+	.4byte	.LASF1004
 	.4byte	.LLRL0
 	.4byte	0
 	.4byte	.Ldebug_line0
@@ -363,17 +363,17 @@ main:
 	.uleb128 0x3
 	.byte	0x1
 	.byte	0x6
-	.4byte	.LASF935
+	.4byte	.LASF936
 	.uleb128 0x3
 	.byte	0x1
 	.byte	0x8
-	.4byte	.LASF936
+	.4byte	.LASF937
 	.uleb128 0x3
 	.byte	0x2
 	.byte	0x5
-	.4byte	.LASF937
+	.4byte	.LASF938
 	.uleb128 0x4
-	.4byte	.LASF940
+	.4byte	.LASF941
 	.byte	0x2
 	.byte	0x39
 	.byte	0x1c
@@ -381,13 +381,13 @@ main:
 	.uleb128 0x3
 	.byte	0x2
 	.byte	0x7
-	.4byte	.LASF938
+	.4byte	.LASF939
 	.uleb128 0x3
 	.byte	0x4
 	.byte	0x5
-	.4byte	.LASF939
+	.4byte	.LASF940
 	.uleb128 0x4
-	.4byte	.LASF941
+	.4byte	.LASF942
 	.byte	0x2
 	.byte	0x4f
 	.byte	0x1b
@@ -395,15 +395,15 @@ main:
 	.uleb128 0x3
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF942
-	.uleb128 0x3
-	.byte	0x8
-	.byte	0x5
 	.4byte	.LASF943
 	.uleb128 0x3
 	.byte	0x8
-	.byte	0x7
+	.byte	0x5
 	.4byte	.LASF944
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.4byte	.LASF945
 	.uleb128 0xe
 	.byte	0x4
 	.byte	0x5
@@ -411,15 +411,15 @@ main:
 	.uleb128 0x3
 	.byte	0x4
 	.byte	0x7
-	.4byte	.LASF945
-	.uleb128 0x4
 	.4byte	.LASF946
+	.uleb128 0x4
+	.4byte	.LASF947
 	.byte	0x3
 	.byte	0x24
 	.byte	0x14
 	.4byte	0x3f
 	.uleb128 0x4
-	.4byte	.LASF947
+	.4byte	.LASF948
 	.byte	0x3
 	.byte	0x30
 	.byte	0x14
@@ -438,13 +438,13 @@ main:
 	.4byte	0xa0
 	.byte	0
 	.uleb128 0x1
-	.4byte	.LASF948
+	.4byte	.LASF949
 	.byte	0x4
 	.byte	0x8
 	.4byte	0xa0
 	.byte	0x4
 	.uleb128 0x1
-	.4byte	.LASF949
+	.4byte	.LASF950
 	.byte	0x4
 	.byte	0x9
 	.4byte	0xa0
@@ -456,115 +456,115 @@ main:
 	.4byte	0xa0
 	.byte	0xc
 	.uleb128 0x1
-	.4byte	.LASF950
+	.4byte	.LASF951
 	.byte	0x4
 	.byte	0xb
 	.4byte	0xa0
 	.byte	0x10
 	.uleb128 0x1
-	.4byte	.LASF951
+	.4byte	.LASF952
 	.byte	0x4
 	.byte	0xc
 	.4byte	0xa0
 	.byte	0x14
 	.uleb128 0x1
-	.4byte	.LASF952
+	.4byte	.LASF953
 	.byte	0x4
 	.byte	0xd
 	.4byte	0x210
 	.byte	0x18
 	.uleb128 0x1
-	.4byte	.LASF953
+	.4byte	.LASF954
 	.byte	0x4
 	.byte	0xe
 	.4byte	0xa0
 	.byte	0x20
 	.uleb128 0x1
-	.4byte	.LASF954
+	.4byte	.LASF955
 	.byte	0x4
 	.byte	0xf
 	.4byte	0xa0
 	.byte	0x24
 	.uleb128 0x1
-	.4byte	.LASF955
+	.4byte	.LASF956
 	.byte	0x4
 	.byte	0x10
 	.4byte	0x210
 	.byte	0x28
 	.uleb128 0x1
-	.4byte	.LASF956
+	.4byte	.LASF957
 	.byte	0x4
 	.byte	0x11
 	.4byte	0xa0
 	.byte	0x30
 	.uleb128 0x1
-	.4byte	.LASF957
+	.4byte	.LASF958
 	.byte	0x4
 	.byte	0x12
 	.4byte	0xa0
 	.byte	0x34
 	.uleb128 0x1
-	.4byte	.LASF958
+	.4byte	.LASF959
 	.byte	0x4
 	.byte	0x13
 	.4byte	0x210
 	.byte	0x38
 	.uleb128 0x1
-	.4byte	.LASF959
+	.4byte	.LASF960
 	.byte	0x4
 	.byte	0x14
 	.4byte	0xa0
 	.byte	0x40
 	.uleb128 0x1
-	.4byte	.LASF960
+	.4byte	.LASF961
 	.byte	0x4
 	.byte	0x15
 	.4byte	0xa0
 	.byte	0x44
 	.uleb128 0x1
-	.4byte	.LASF961
+	.4byte	.LASF962
 	.byte	0x4
 	.byte	0x16
 	.4byte	0x210
 	.byte	0x48
 	.uleb128 0x1
-	.4byte	.LASF962
+	.4byte	.LASF963
 	.byte	0x4
 	.byte	0x17
 	.4byte	0xa0
 	.byte	0x50
 	.uleb128 0x1
-	.4byte	.LASF963
+	.4byte	.LASF964
 	.byte	0x4
 	.byte	0x18
 	.4byte	0xa0
 	.byte	0x54
 	.uleb128 0x1
-	.4byte	.LASF964
+	.4byte	.LASF965
 	.byte	0x4
 	.byte	0x19
 	.4byte	0x210
 	.byte	0x58
 	.uleb128 0x1
-	.4byte	.LASF965
+	.4byte	.LASF966
 	.byte	0x4
 	.byte	0x1a
 	.4byte	0xa0
 	.byte	0x60
 	.uleb128 0x1
-	.4byte	.LASF966
+	.4byte	.LASF967
 	.byte	0x4
 	.byte	0x1b
 	.4byte	0xa0
 	.byte	0x64
 	.uleb128 0x1
-	.4byte	.LASF967
+	.4byte	.LASF968
 	.byte	0x4
 	.byte	0x1c
 	.4byte	0x210
 	.byte	0x68
 	.uleb128 0x1
-	.4byte	.LASF968
+	.4byte	.LASF969
 	.byte	0x4
 	.byte	0x1d
 	.4byte	0xa0
@@ -576,25 +576,25 @@ main:
 	.4byte	0xa0
 	.byte	0x74
 	.uleb128 0x1
-	.4byte	.LASF969
+	.4byte	.LASF970
 	.byte	0x4
 	.byte	0x1f
 	.4byte	0x210
 	.byte	0x78
 	.uleb128 0x1
-	.4byte	.LASF970
+	.4byte	.LASF971
 	.byte	0x4
 	.byte	0x20
 	.4byte	0xa0
 	.byte	0x80
 	.uleb128 0x1
-	.4byte	.LASF971
+	.4byte	.LASF972
 	.byte	0x4
 	.byte	0x21
 	.4byte	0xa0
 	.byte	0x84
 	.uleb128 0x1
-	.4byte	.LASF972
+	.4byte	.LASF973
 	.byte	0x4
 	.byte	0x22
 	.4byte	0xa0
@@ -614,30 +614,30 @@ main:
 	.byte	0x1
 	.4byte	0x31
 	.byte	0x5
-	.byte	0x1f
+	.byte	0x21
 	.byte	0xe
 	.4byte	0x23c
 	.uleb128 0x5
-	.4byte	.LASF973
+	.4byte	.LASF974
 	.byte	0
 	.uleb128 0x5
-	.4byte	.LASF974
+	.4byte	.LASF975
 	.byte	0x1
 	.uleb128 0x5
-	.4byte	.LASF975
+	.4byte	.LASF976
 	.byte	0x2
 	.uleb128 0x5
-	.4byte	.LASF976
+	.4byte	.LASF977
 	.byte	0x3
 	.byte	0
 	.uleb128 0x4
-	.4byte	.LASF977
+	.4byte	.LASF978
 	.byte	0x5
-	.byte	0x24
+	.byte	0x26
 	.byte	0x3
 	.4byte	0x215
 	.uleb128 0x9
-	.4byte	.LASF978
+	.4byte	.LASF979
 	.byte	0x18
 	.byte	0x6
 	.4byte	0x29a
@@ -648,13 +648,13 @@ main:
 	.4byte	0xa0
 	.byte	0
 	.uleb128 0x1
-	.4byte	.LASF979
+	.4byte	.LASF980
 	.byte	0x6
 	.byte	0x8
 	.4byte	0xa0
 	.byte	0x4
 	.uleb128 0x1
-	.4byte	.LASF980
+	.4byte	.LASF981
 	.byte	0x6
 	.byte	0x9
 	.4byte	0xa0
@@ -672,7 +672,7 @@ main:
 	.4byte	0xa0
 	.byte	0x10
 	.uleb128 0x1
-	.4byte	.LASF981
+	.4byte	.LASF982
 	.byte	0x6
 	.byte	0xc
 	.4byte	0xa0
@@ -697,7 +697,7 @@ main:
 	.byte	0x4
 	.byte	0
 	.uleb128 0x9
-	.4byte	.LASF982
+	.4byte	.LASF983
 	.byte	0x50
 	.byte	0x8
 	.4byte	0x3b8
@@ -714,13 +714,13 @@ main:
 	.4byte	0xa0
 	.byte	0x4
 	.uleb128 0x1
-	.4byte	.LASF983
+	.4byte	.LASF984
 	.byte	0x8
 	.byte	0x9
 	.4byte	0xa0
 	.byte	0x8
 	.uleb128 0x1
-	.4byte	.LASF984
+	.4byte	.LASF985
 	.byte	0x8
 	.byte	0xa
 	.4byte	0xa0
@@ -738,19 +738,19 @@ main:
 	.4byte	0xa0
 	.byte	0x14
 	.uleb128 0x1
-	.4byte	.LASF985
+	.4byte	.LASF986
 	.byte	0x8
 	.byte	0xd
 	.4byte	0xa0
 	.byte	0x18
 	.uleb128 0x1
-	.4byte	.LASF986
+	.4byte	.LASF987
 	.byte	0x8
 	.byte	0xe
 	.4byte	0xa0
 	.byte	0x1c
 	.uleb128 0x1
-	.4byte	.LASF987
+	.4byte	.LASF988
 	.byte	0x8
 	.byte	0xf
 	.4byte	0xa0
@@ -780,31 +780,31 @@ main:
 	.4byte	0xa0
 	.byte	0x30
 	.uleb128 0x1
-	.4byte	.LASF988
+	.4byte	.LASF989
 	.byte	0x8
 	.byte	0x14
 	.4byte	0xa0
 	.byte	0x34
 	.uleb128 0x1
-	.4byte	.LASF989
+	.4byte	.LASF990
 	.byte	0x8
 	.byte	0x15
 	.4byte	0xa0
 	.byte	0x38
 	.uleb128 0x1
-	.4byte	.LASF990
+	.4byte	.LASF991
 	.byte	0x8
 	.byte	0x16
 	.4byte	0xa0
 	.byte	0x3c
 	.uleb128 0x1
-	.4byte	.LASF991
+	.4byte	.LASF992
 	.byte	0x8
 	.byte	0x17
 	.4byte	0xa0
 	.byte	0x40
 	.uleb128 0x1
-	.4byte	.LASF992
+	.4byte	.LASF993
 	.byte	0x8
 	.byte	0x18
 	.4byte	0xa0
@@ -816,15 +816,15 @@ main:
 	.4byte	0xa0
 	.byte	0x48
 	.uleb128 0x1
-	.4byte	.LASF993
+	.4byte	.LASF994
 	.byte	0x8
 	.byte	0x1a
 	.4byte	0xa0
 	.byte	0x4c
 	.byte	0
 	.uleb128 0xa
-	.4byte	.LASF995
-	.byte	0x27
+	.4byte	.LASF996
+	.byte	0x29
 	.4byte	0x3cd
 	.uleb128 0x6
 	.4byte	0x88
@@ -834,10 +834,10 @@ main:
 	.uleb128 0x3
 	.byte	0x1
 	.byte	0x2
-	.4byte	.LASF994
+	.4byte	.LASF995
 	.uleb128 0xa
-	.4byte	.LASF996
-	.byte	0x26
+	.4byte	.LASF997
+	.byte	0x28
 	.4byte	0x3e9
 	.uleb128 0x6
 	.4byte	0x88
@@ -845,13 +845,13 @@ main:
 	.4byte	0x23c
 	.byte	0
 	.uleb128 0xb
-	.4byte	.LASF997
+	.4byte	.LASF998
 	.byte	0x24
 	.uleb128 0xb
-	.4byte	.LASF998
+	.4byte	.LASF999
 	.byte	0x23
 	.uleb128 0x12
-	.4byte	.LASF1004
+	.4byte	.LASF1005
 	.byte	0x1
 	.byte	0x4b
 	.byte	0x5
@@ -871,7 +871,7 @@ main:
 	.byte	0x91
 	.sleb128 -14
 	.uleb128 0xc
-	.4byte	.LASF999
+	.4byte	.LASF1000
 	.byte	0x55
 	.byte	0xc
 	.4byte	0x88
@@ -879,7 +879,7 @@ main:
 	.byte	0x91
 	.sleb128 -10
 	.uleb128 0xc
-	.4byte	.LASF1000
+	.4byte	.LASF1001
 	.byte	0x56
 	.byte	0x7
 	.4byte	0x3cd
@@ -888,7 +888,7 @@ main:
 	.sleb128 -11
 	.byte	0
 	.uleb128 0x14
-	.4byte	.LASF1005
+	.4byte	.LASF1006
 	.byte	0x1
 	.byte	0xc
 	.byte	0xd
@@ -2768,7 +2768,7 @@ main:
 	.byte	0x4
 	.byte	0x5
 	.uleb128 0xa
-	.4byte	.LASF934
+	.4byte	.LASF935
 	.byte	0x4
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4._newlib_version.h.4.6d111ab2e95434b664b53815e5c8ccba,comdat
@@ -4200,7 +4200,7 @@ main:
 	.uleb128 0x7a
 	.4byte	.LASF903
 	.byte	0
-	.section	.debug_macro,"G",%progbits,wm4.gpio.h.2.ca8518d3facb6a329deaeb59004fd0a1,comdat
+	.section	.debug_macro,"G",%progbits,wm4.gpio.h.2.3af2911851c1c29c51024d0f06788d31,comdat
 .Ldebug_macro16:
 	.2byte	0x5
 	.byte	0
@@ -4225,6 +4225,9 @@ main:
 	.byte	0x5
 	.uleb128 0x1d
 	.4byte	.LASF910
+	.byte	0x5
+	.uleb128 0x1f
+	.4byte	.LASF911
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4.flash.h.2.51d6f0499046dca8c8d7cee08875e55f,comdat
 .Ldebug_macro17:
@@ -4232,37 +4235,37 @@ main:
 	.byte	0
 	.byte	0x5
 	.uleb128 0x2
-	.4byte	.LASF911
-	.byte	0x5
-	.uleb128 0xf
 	.4byte	.LASF912
 	.byte	0x5
-	.uleb128 0x10
+	.uleb128 0xf
 	.4byte	.LASF913
 	.byte	0x5
-	.uleb128 0x14
+	.uleb128 0x10
 	.4byte	.LASF914
 	.byte	0x5
-	.uleb128 0x15
+	.uleb128 0x14
 	.4byte	.LASF915
 	.byte	0x5
-	.uleb128 0x18
+	.uleb128 0x15
 	.4byte	.LASF916
 	.byte	0x5
-	.uleb128 0x19
+	.uleb128 0x18
 	.4byte	.LASF917
 	.byte	0x5
-	.uleb128 0x1c
+	.uleb128 0x19
 	.4byte	.LASF918
 	.byte	0x5
-	.uleb128 0x1e
+	.uleb128 0x1c
 	.4byte	.LASF919
 	.byte	0x5
-	.uleb128 0x1f
+	.uleb128 0x1e
 	.4byte	.LASF920
 	.byte	0x5
-	.uleb128 0x20
+	.uleb128 0x1f
 	.4byte	.LASF921
+	.byte	0x5
+	.uleb128 0x20
+	.4byte	.LASF922
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4.pwr.h.2.b22d01f8fafa27268c4600cc8f787804,comdat
 .Ldebug_macro18:
@@ -4270,25 +4273,25 @@ main:
 	.byte	0
 	.byte	0x5
 	.uleb128 0x2
-	.4byte	.LASF922
-	.byte	0x5
-	.uleb128 0xb
 	.4byte	.LASF923
 	.byte	0x5
-	.uleb128 0xc
+	.uleb128 0xb
 	.4byte	.LASF924
 	.byte	0x5
-	.uleb128 0xf
+	.uleb128 0xc
 	.4byte	.LASF925
 	.byte	0x5
-	.uleb128 0x12
+	.uleb128 0xf
 	.4byte	.LASF926
 	.byte	0x5
-	.uleb128 0x13
+	.uleb128 0x12
 	.4byte	.LASF927
 	.byte	0x5
-	.uleb128 0x14
+	.uleb128 0x13
 	.4byte	.LASF928
+	.byte	0x5
+	.uleb128 0x14
+	.4byte	.LASF929
 	.byte	0
 	.section	.debug_macro,"G",%progbits,wm4.timer.h.2.2e929ede818fb0960868f1b0a08a1cbf,comdat
 .Ldebug_macro19:
@@ -4296,19 +4299,19 @@ main:
 	.byte	0
 	.byte	0x5
 	.uleb128 0x2
-	.4byte	.LASF929
-	.byte	0x5
-	.uleb128 0x1d
 	.4byte	.LASF930
 	.byte	0x5
-	.uleb128 0x1e
+	.uleb128 0x1d
 	.4byte	.LASF931
 	.byte	0x5
-	.uleb128 0x20
+	.uleb128 0x1e
 	.4byte	.LASF932
 	.byte	0x5
-	.uleb128 0x21
+	.uleb128 0x20
 	.4byte	.LASF933
+	.byte	0x5
+	.uleb128 0x21
+	.4byte	.LASF934
 	.byte	0
 	.section	.debug_line,"",%progbits
 .Ldebug_line0:
@@ -4325,7 +4328,7 @@ main:
 	.ascii	"__UHA_FBIT__ 8\000"
 .LASF814:
 	.ascii	"PRIiFAST64 __PRI64FAST(i)\000"
-.LASF936:
+.LASF937:
 	.ascii	"unsigned char\000"
 .LASF225:
 	.ascii	"__FLT64_DENORM_MIN__ 4.9406564584124654e-324F64\000"
@@ -4355,7 +4358,7 @@ main:
 	.ascii	"__WINT_MIN__ 0U\000"
 .LASF90:
 	.ascii	"__INTMAX_MAX__ 0x7fffffffffffffffLL\000"
-.LASF975:
+.LASF976:
 	.ascii	"GPIO_MODE_AF\000"
 .LASF335:
 	.ascii	"__TQ_IBIT__ 0\000"
@@ -4381,7 +4384,7 @@ main:
 	.ascii	"__FRACT_MIN__ (-0.5R-0.5R)\000"
 .LASF324:
 	.ascii	"__ULLACCUM_MAX__ 0XFFFFFFFFFFFFFFFFP-32ULLK\000"
-.LASF978:
+.LASF979:
 	.ascii	"flash\000"
 .LASF294:
 	.ascii	"__USACCUM_MAX__ 0XFFFFP-8UHK\000"
@@ -4456,9 +4459,9 @@ main:
 	.ascii	"_LDBL_EQ_DBL 1\000"
 .LASF675:
 	.ascii	"PRIi8 __PRI8(i)\000"
-.LASF917:
+.LASF918:
 	.ascii	"FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)\000"
-.LASF927:
+.LASF928:
 	.ascii	"PWR_CR_VOS_MASK (0b11)\000"
 .LASF62:
 	.ascii	"__INT_FAST64_TYPE__ long long int\000"
@@ -4468,6 +4471,8 @@ main:
 	.ascii	"PRIx8 __PRI8(x)\000"
 .LASF589:
 	.ascii	"INT8_MAX (__INT8_MAX__)\000"
+.LASF908:
+	.ascii	"PORT(port) (((port) - 'A') << 8)\000"
 .LASF630:
 	.ascii	"PTRDIFF_MAX (__PTRDIFF_MAX__)\000"
 .LASF838:
@@ -4490,7 +4495,7 @@ main:
 	.ascii	"__need_wchar_t\000"
 .LASF199:
 	.ascii	"__FLT32_MIN_EXP__ (-125)\000"
-.LASF1001:
+.LASF1002:
 	.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"
@@ -4509,7 +4514,7 @@ main:
 	.ascii	"__int_fast32_t_defined 1\000"
 .LASF133:
 	.ascii	"__INT_FAST64_WIDTH__ 64\000"
-.LASF993:
+.LASF994:
 	.ascii	"DMAR\000"
 .LASF659:
 	.ascii	"___int_wchar_t_h \000"
@@ -4562,13 +4567,13 @@ main:
 	.ascii	"SCNo32 __SCN32(o)\000"
 .LASF540:
 	.ascii	"_NOTHROW \000"
-.LASF988:
+.LASF989:
 	.ascii	"CCR1\000"
 .LASF633:
 	.ascii	"WCHAR_MAX (__WCHAR_MAX__)\000"
-.LASF990:
-	.ascii	"CCR3\000"
 .LASF991:
+	.ascii	"CCR3\000"
+.LASF992:
 	.ascii	"CCR4\000"
 .LASF307:
 	.ascii	"__LACCUM_IBIT__ 32\000"
@@ -4592,7 +4597,7 @@ main:
 	.ascii	"__INT64 \"ll\"\000"
 .LASF138:
 	.ascii	"__INTPTR_MAX__ 0x7fffffff\000"
-.LASF963:
+.LASF964:
 	.ascii	"AHB2LPENR\000"
 .LASF499:
 	.ascii	"__RAND_MAX\000"
@@ -4635,7 +4640,7 @@ main:
 	.ascii	" RCC_PLLCFGR_PLLP_BIT)\000"
 .LASF302:
 	.ascii	"__UACCUM_IBIT__ 16\000"
-.LASF939:
+.LASF940:
 	.ascii	"long int\000"
 .LASF719:
 	.ascii	"SCNd16 __SCN16(d)\000"
@@ -4686,7 +4691,7 @@ main:
 	.ascii	"__FLT32_MAX_EXP__ 128\000"
 .LASF824:
 	.ascii	"__PRIMAX(x) __STRINGIFY(ll ##x)\000"
-.LASF1004:
+.LASF1005:
 	.ascii	"main\000"
 .LASF435:
 	.ascii	"__THUMB_INTERWORK__ 1\000"
@@ -4714,7 +4719,7 @@ main:
 	.ascii	"__SIZEOF_LONG__ 4\000"
 .LASF753:
 	.ascii	"PRIi32 __PRI32(i)\000"
-.LASF960:
+.LASF961:
 	.ascii	"APB2ENR\000"
 .LASF855:
 	.ascii	"RCC_H_ \000"
@@ -4726,11 +4731,11 @@ main:
 	.ascii	"__SIZEOF_DOUBLE__ 8\000"
 .LASF114:
 	.ascii	"__INT_LEAST32_WIDTH__ 32\000"
-.LASF916:
+.LASF917:
 	.ascii	"FLASH_ACR_ICEN_BIT 9\000"
 .LASF815:
 	.ascii	"PRIoFAST64 __PRI64FAST(o)\000"
-.LASF962:
+.LASF963:
 	.ascii	"AHB1LPENR\000"
 .LASF406:
 	.ascii	"__ARM_FEATURE_SIMD32 1\000"
@@ -4742,7 +4747,7 @@ main:
 	.ascii	"PRIoLEAST16 __PRI16LEAST(o)\000"
 .LASF458:
 	.ascii	"__NEWLIB__ 4\000"
-.LASF972:
+.LASF973:
 	.ascii	"DCKCFGR\000"
 .LASF720:
 	.ascii	"SCNi16 __SCN16(i)\000"
@@ -4752,7 +4757,7 @@ main:
 	.ascii	"__FLT_DECIMAL_DIG__ 9\000"
 .LASF562:
 	.ascii	"_UINT8_T_DECLARED \000"
-.LASF935:
+.LASF936:
 	.ascii	"signed char\000"
 .LASF805:
 	.ascii	"PRIuLEAST64 __PRI64LEAST(u)\000"
@@ -4762,7 +4767,7 @@ main:
 	.ascii	"INTMAX_MIN (-INTMAX_MAX - 1)\000"
 .LASF364:
 	.ascii	"__GNUC_STDC_INLINE__ 1\000"
-.LASF977:
+.LASF978:
 	.ascii	"GPIO_MODE\000"
 .LASF256:
 	.ascii	"__FRACT_FBIT__ 15\000"
@@ -4788,19 +4793,19 @@ main:
 	.ascii	"__FLT64_MAX_10_EXP__ 308\000"
 .LASF879:
 	.ascii	"RCC_PLLCFGR_PLLN_MASK (0b111111111)\000"
-.LASF952:
+.LASF953:
 	.ascii	"RESERVED0\000"
-.LASF955:
+.LASF956:
 	.ascii	"RESERVED1\000"
-.LASF958:
+.LASF959:
 	.ascii	"RESERVED2\000"
 .LASF3:
 	.ascii	"__STDC_UTF_32__ 1\000"
-.LASF964:
+.LASF965:
 	.ascii	"RESERVED4\000"
 .LASF241:
 	.ascii	"__FLT32X_DENORM_MIN__ 4.9406564584124654e-324F32x\000"
-.LASF969:
+.LASF970:
 	.ascii	"RESERVED6\000"
 .LASF152:
 	.ascii	"__FLT_MAX_10_EXP__ 38\000"
@@ -4812,7 +4817,7 @@ main:
 	.ascii	"__FRACT_MAX__ 0X7FFFP-15R\000"
 .LASF728:
 	.ascii	"PRIxLEAST16 __PRI16LEAST(x)\000"
-.LASF928:
+.LASF929:
 	.ascii	"PWR_CR_VOS(scale) ((scale & PWR_CR_VOS_MASK) << PWR"
 	.ascii	"_CR_VOS_BIT)\000"
 .LASF130:
@@ -4827,7 +4832,7 @@ main:
 	.ascii	"RCC_CFGR_SW_PLL (0b10)\000"
 .LASF844:
 	.ascii	"PRIXPTR __PRIPTR(X)\000"
-.LASF932:
+.LASF933:
 	.ascii	"TIM_CR1_CEN_BIT 0\000"
 .LASF797:
 	.ascii	"SCNd64 __SCN64(d)\000"
@@ -4847,13 +4852,13 @@ main:
 	.ascii	"__int_fast64_t_defined 1\000"
 .LASF837:
 	.ascii	"__PRIPTR(x) __STRINGIFY(x)\000"
-.LASF946:
+.LASF947:
 	.ascii	"uint16_t\000"
 .LASF417:
 	.ascii	"__thumb2__ 1\000"
 .LASF321:
 	.ascii	"__ULLACCUM_FBIT__ 32\000"
-.LASF994:
+.LASF995:
 	.ascii	"_Bool\000"
 .LASF900:
 	.ascii	"RCC_APB1ENR_PWREN_BIT 28\000"
@@ -4865,23 +4870,23 @@ main:
 	.ascii	"SCNxLEAST64 __SCN64LEAST(x)\000"
 .LASF769:
 	.ascii	"SCNdLEAST32 __SCN32LEAST(d)\000"
-.LASF961:
+.LASF962:
 	.ascii	"RESERVED3\000"
 .LASF22:
 	.ascii	"__SIZEOF_LONG_DOUBLE__ 8\000"
-.LASF967:
+.LASF968:
 	.ascii	"RESERVED5\000"
-.LASF985:
-	.ascii	"CCMR1\000"
 .LASF986:
+	.ascii	"CCMR1\000"
+.LASF987:
 	.ascii	"CCMR2\000"
 .LASF36:
 	.ascii	"__WCHAR_TYPE__ unsigned int\000"
-.LASF929:
+.LASF930:
 	.ascii	"TIMER_H_ \000"
 .LASF469:
 	.ascii	"_MB_LEN_MAX 8\000"
-.LASF974:
+.LASF975:
 	.ascii	"GPIO_MODE_OUTPUT\000"
 .LASF357:
 	.ascii	"__USA_IBIT__ 16\000"
@@ -4921,9 +4926,9 @@ main:
 	.ascii	"__SCN64(x) __INT64 __STRINGIFY(x)\000"
 .LASF646:
 	.ascii	"_GCC_WRAP_STDINT_H \000"
-.LASF940:
+.LASF941:
 	.ascii	"__uint16_t\000"
-.LASF957:
+.LASF958:
 	.ascii	"AHB2ENR\000"
 .LASF804:
 	.ascii	"PRIoLEAST64 __PRI64LEAST(o)\000"
@@ -4937,7 +4942,7 @@ main:
 	.ascii	"__UINT8_MAX__ 0xff\000"
 .LASF552:
 	.ascii	"___int16_t_defined 1\000"
-.LASF982:
+.LASF983:
 	.ascii	"timer\000"
 .LASF184:
 	.ascii	"__LDBL_MAX_EXP__ 1024\000"
@@ -4955,9 +4960,9 @@ main:
 	.ascii	"INT32_MAX (__INT32_MAX__)\000"
 .LASF426:
 	.ascii	"__ARM_FP16_FORMAT_ALTERNATIVE\000"
-.LASF1005:
+.LASF1006:
 	.ascii	"system_clock_init\000"
-.LASF913:
+.LASF914:
 	.ascii	"FLASH ((struct flash *) FLASH_BASE_ADDR)\000"
 .LASF69:
 	.ascii	"__GXX_ABI_VERSION 1017\000"
@@ -4973,7 +4978,7 @@ main:
 	.ascii	"_END_STD_C \000"
 .LASF852:
 	.ascii	"true ((_Bool)+1u)\000"
-.LASF918:
+.LASF919:
 	.ascii	"FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)\000"
 .LASF599:
 	.ascii	"UINT_LEAST16_MAX (__UINT_LEAST16_MAX__)\000"
@@ -4989,8 +4994,6 @@ main:
 	.ascii	"__FLT_EPSILON__ 1.1920928955078125e-7F\000"
 .LASF297:
 	.ascii	"__ACCUM_IBIT__ 16\000"
-.LASF908:
-	.ascii	"PIN(port,num) ((((port) - 'A') << 8) | num)\000"
 .LASF806:
 	.ascii	"PRIxLEAST64 __PRI64LEAST(x)\000"
 .LASF35:
@@ -5029,7 +5032,7 @@ main:
 	.ascii	"__ELF__ 1\000"
 .LASF688:
 	.ascii	"PRIuLEAST8 __PRI8LEAST(u)\000"
-.LASF968:
+.LASF969:
 	.ascii	"BDCR\000"
 .LASF853:
 	.ascii	"false ((_Bool)+0u)\000"
@@ -5091,7 +5094,7 @@ main:
 	.ascii	"RCC_CR_HSERDY_READY (1 << RCC_CR_HSERDY_BIT)\000"
 .LASF762:
 	.ascii	"SCNx32 __SCN32(x)\000"
-.LASF949:
+.LASF950:
 	.ascii	"CFGR\000"
 .LASF557:
 	.ascii	"___int_least32_t_defined 1\000"
@@ -5139,7 +5142,7 @@ main:
 	.ascii	"__PRI8LEAST(x) __LEAST8 __STRINGIFY(x)\000"
 .LASF174:
 	.ascii	"__DBL_EPSILON__ ((double)2.2204460492503131e-16L)\000"
-.LASF980:
+.LASF981:
 	.ascii	"OPTKEYR\000"
 .LASF268:
 	.ascii	"__LFRACT_MIN__ (-0.5LR-0.5LR)\000"
@@ -5163,7 +5166,7 @@ main:
 	.ascii	"___int8_t_defined 1\000"
 .LASF248:
 	.ascii	"__SFRACT_MIN__ (-0.5HR-0.5HR)\000"
-.LASF942:
+.LASF943:
 	.ascii	"long unsigned int\000"
 .LASF349:
 	.ascii	"__SA_IBIT__ 16\000"
@@ -5181,9 +5184,9 @@ main:
 	.ascii	"__UINT16_TYPE__ short unsigned int\000"
 .LASF873:
 	.ascii	"RCC_PLLCFGR_PLLSRC_BIT 22\000"
-.LASF995:
+.LASF996:
 	.ascii	"gpio_write\000"
-.LASF984:
+.LASF985:
 	.ascii	"DIER\000"
 .LASF656:
 	.ascii	"_WCHAR_T_DEFINED_ \000"
@@ -5193,7 +5196,7 @@ main:
 	.ascii	"int +2\000"
 .LASF636:
 	.ascii	"INT8_C(x) __INT8_C(x)\000"
-.LASF934:
+.LASF935:
 	.ascii	"exit 42\000"
 .LASF63:
 	.ascii	"__UINT_FAST8_TYPE__ unsigned int\000"
@@ -5225,7 +5228,7 @@ main:
 	.ascii	"SCNx8 __SCN8(x)\000"
 .LASF208:
 	.ascii	"__FLT32_DENORM_MIN__ 1.4012984643248171e-45F32\000"
-.LASF996:
+.LASF997:
 	.ascii	"gpio_set_mode\000"
 .LASF125:
 	.ascii	"__UINT64_C(c) c ## ULL\000"
@@ -5291,7 +5294,7 @@ main:
 	.ascii	"PRIX32 __PRI32(X)\000"
 .LASF773:
 	.ascii	"SCNxLEAST32 __SCN32LEAST(x)\000"
-.LASF997:
+.LASF998:
 	.ascii	"tim4_start\000"
 .LASF711:
 	.ascii	"__SCN16LEAST(x) __LEAST16 __STRINGIFY(x)\000"
@@ -5299,7 +5302,7 @@ main:
 	.ascii	"__GNUC__ 12\000"
 .LASF692:
 	.ascii	"SCNiLEAST8 __SCN8LEAST(i)\000"
-.LASF924:
+.LASF925:
 	.ascii	"PWR ((struct pwr *) PWR_BASE_ADDR)\000"
 .LASF752:
 	.ascii	"PRId32 __PRI32(d)\000"
@@ -5323,7 +5326,7 @@ main:
 	.ascii	"__ULACCUM_MIN__ 0.0ULK\000"
 .LASF461:
 	.ascii	"_ATEXIT_DYNAMIC_ALLOC 1\000"
-.LASF941:
+.LASF942:
 	.ascii	"__uint32_t\000"
 .LASF188:
 	.ascii	"__LDBL_MAX__ 1.7976931348623157e+308L\000"
@@ -5333,7 +5336,7 @@ main:
 	.ascii	"__FLT_RADIX__ 2\000"
 .LASF454:
 	.ascii	"_INTTYPES_H \000"
-.LASF943:
+.LASF944:
 	.ascii	"long long int\000"
 .LASF784:
 	.ascii	"SCNxFAST32 __SCN32FAST(x)\000"
@@ -5343,11 +5346,11 @@ main:
 	.ascii	"__LONG_WIDTH__ 32\000"
 .LASF602:
 	.ascii	"UINT32_MAX (__UINT32_MAX__)\000"
-.LASF999:
+.LASF1000:
 	.ascii	"counter\000"
 .LASF648:
 	.ascii	"__wchar_t__ \000"
-.LASF926:
+.LASF927:
 	.ascii	"PWR_CR_VOS_BIT 14\000"
 .LASF195:
 	.ascii	"__LDBL_HAS_QUIET_NAN__ 1\000"
@@ -5359,7 +5362,7 @@ main:
 	.ascii	"WINT_MAX (__WINT_MAX__)\000"
 .LASF822:
 	.ascii	"SCNuFAST64 __SCN64FAST(u)\000"
-.LASF970:
+.LASF971:
 	.ascii	"SSCGR\000"
 .LASF137:
 	.ascii	"__UINT_FAST64_MAX__ 0xffffffffffffffffULL\000"
@@ -5373,11 +5376,11 @@ main:
 	.ascii	"__INTPTR_WIDTH__ 32\000"
 .LASF379:
 	.ascii	"__GCC_ATOMIC_LLONG_LOCK_FREE 1\000"
-.LASF948:
+.LASF949:
 	.ascii	"PLLCFGR\000"
 .LASF239:
 	.ascii	"__FLT32X_MIN__ 2.2250738585072014e-308F32x\000"
-.LASF919:
+.LASF920:
 	.ascii	"FLASH_ACR_LATENCY_BIT 0\000"
 .LASF218:
 	.ascii	"__FLT64_MAX_EXP__ 1024\000"
@@ -5389,7 +5392,7 @@ main:
 	.ascii	"___int32_t_defined 1\000"
 .LASF83:
 	.ascii	"__INT_WIDTH__ 32\000"
-.LASF954:
+.LASF955:
 	.ascii	"APB2RSTR\000"
 .LASF409:
 	.ascii	"__ARM_ARCH_PROFILE\000"
@@ -5439,9 +5442,9 @@ main:
 	.ascii	"__ARM_NEON_FP\000"
 .LASF280:
 	.ascii	"__LLFRACT_EPSILON__ 0x1P-63LLR\000"
-.LASF966:
+.LASF967:
 	.ascii	"APB2LPENR\000"
-.LASF933:
+.LASF934:
 	.ascii	"TIM_ENABLE (1 << TIM_CR1_CEN_BIT)\000"
 .LASF820:
 	.ascii	"SCNiFAST64 __SCN64FAST(i)\000"
@@ -5449,7 +5452,7 @@ main:
 	.ascii	"_ANSIDECL_H_ \000"
 .LASF683:
 	.ascii	"SCNu8 __SCN8(u)\000"
-.LASF930:
+.LASF931:
 	.ascii	"TIM4_BASE_ADDR (0x40000800U)\000"
 .LASF261:
 	.ascii	"__UFRACT_FBIT__ 16\000"
@@ -5464,7 +5467,7 @@ main:
 	.ascii	"__FLOAT_TYPE float\000"
 .LASF185:
 	.ascii	"__LDBL_MAX_10_EXP__ 308\000"
-.LASF921:
+.LASF922:
 	.ascii	"FLASH_ACR_LATENCY(latency) ((latency & FLASH_ACR_LA"
 	.ascii	"TENCY_MASK) << FLASH_ACR_LATENCY_BIT)\000"
 .LASF175:
@@ -5472,7 +5475,7 @@ main:
 	.ascii	"L)\000"
 .LASF607:
 	.ascii	"INT64_MAX (__INT64_MAX__)\000"
-.LASF945:
+.LASF946:
 	.ascii	"unsigned int\000"
 .LASF862:
 	.ascii	"RCC_CR_HSERDY_BIT 17\000"
@@ -5490,7 +5493,7 @@ main:
 	.ascii	"PRIiFAST16 __PRI16FAST(i)\000"
 .LASF292:
 	.ascii	"__USACCUM_IBIT__ 8\000"
-.LASF915:
+.LASF916:
 	.ascii	"FLASH_ACR_DCEN_ENABLE (1 <<FLASH_ACR_DCEN_BIT)\000"
 .LASF612:
 	.ascii	"INT_FAST8_MIN (-__INT_FAST8_MAX__ - 1)\000"
@@ -5560,11 +5563,11 @@ main:
 	.ascii	"INTPTR_MAX (__INTPTR_MAX__)\000"
 .LASF667:
 	.ascii	"__STRINGIFY(a) #a\000"
-.LASF922:
+.LASF923:
 	.ascii	"PWR_H_ \000"
 .LASF356:
 	.ascii	"__USA_FBIT__ 16\000"
-.LASF965:
+.LASF966:
 	.ascii	"APB1LPENR\000"
 .LASF479:
 	.ascii	"__IEEE_LITTLE_ENDIAN \000"
@@ -5610,7 +5613,7 @@ main:
 	.ascii	"WCHAR_MIN (__WCHAR_MIN__)\000"
 .LASF594:
 	.ascii	"INT16_MIN (-__INT16_MAX__ - 1)\000"
-.LASF989:
+.LASF990:
 	.ascii	"CCR2\000"
 .LASF189:
 	.ascii	"__LDBL_NORM_MAX__ 1.7976931348623157e+308L\000"
@@ -5672,7 +5675,7 @@ main:
 	.ascii	"SCNuFAST16 __SCN16FAST(u)\000"
 .LASF801:
 	.ascii	"SCNx64 __SCN64(x)\000"
-.LASF910:
+.LASF911:
 	.ascii	"PINPORT(pin) (pin >> 8)\000"
 .LASF198:
 	.ascii	"__FLT32_DIG__ 6\000"
@@ -5694,13 +5697,13 @@ main:
 	.ascii	"__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1\000"
 .LASF733:
 	.ascii	"SCNuLEAST16 __SCN16LEAST(u)\000"
-.LASF953:
+.LASF954:
 	.ascii	"APB1RSTR\000"
 .LASF298:
 	.ascii	"__ACCUM_MIN__ (-0X1P15K-0X1P15K)\000"
 .LASF393:
 	.ascii	"__ARM_FEATURE_CRYPTO\000"
-.LASF959:
+.LASF960:
 	.ascii	"APB1ENR\000"
 .LASF741:
 	.ascii	"SCNdFAST16 __SCN16FAST(d)\000"
@@ -5730,7 +5733,7 @@ main:
 	.ascii	")\000"
 .LASF155:
 	.ascii	"__FLT_NORM_MAX__ 3.4028234663852886e+38F\000"
-.LASF944:
+.LASF945:
 	.ascii	"long long unsigned int\000"
 .LASF611:
 	.ascii	"UINT_LEAST64_MAX (__UINT_LEAST64_MAX__)\000"
@@ -5777,11 +5780,11 @@ main:
 	.ascii	" RCC_PLLCFGR_PLLN_BIT)\000"
 .LASF56:
 	.ascii	"__UINT_LEAST16_TYPE__ short unsigned int\000"
-.LASF925:
+.LASF926:
 	.ascii	"PWR_SCALE3 (0b11)\000"
 .LASF573:
 	.ascii	"_INTMAX_T_DECLARED \000"
-.LASF987:
+.LASF988:
 	.ascii	"CCER\000"
 .LASF40:
 	.ascii	"__CHAR16_TYPE__ short unsigned int\000"
@@ -5839,18 +5842,20 @@ main:
 	.ascii	"__int20__ +2\000"
 .LASF654:
 	.ascii	"_WCHAR_T_ \000"
-.LASF983:
+.LASF984:
 	.ascii	"SMCR\000"
 .LASF828:
 	.ascii	"PRIoMAX __PRIMAX(o)\000"
 .LASF747:
 	.ascii	"__SCN32(x) __INT32 __STRINGIFY(x)\000"
-.LASF920:
+.LASF921:
 	.ascii	"FLASH_ACR_LATENCY_MASK (0b1111)\000"
-.LASF973:
+.LASF974:
 	.ascii	"GPIO_MODE_INPUT\000"
 .LASF743:
 	.ascii	"SCNoFAST16 __SCN16FAST(o)\000"
+.LASF909:
+	.ascii	"PIN(port,num) (PORT(port) | num)\000"
 .LASF345:
 	.ascii	"__UTQ_IBIT__ 0\000"
 .LASF348:
@@ -5913,7 +5918,7 @@ main:
 	.ascii	"__ARM_ARCH_7EM__ 1\000"
 .LASF428:
 	.ascii	"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC\000"
-.LASF956:
+.LASF957:
 	.ascii	"AHB1ENR\000"
 .LASF295:
 	.ascii	"__USACCUM_EPSILON__ 0x1P-8UHK\000"
@@ -5953,7 +5958,7 @@ main:
 	.ascii	"__DBL_DIG__ 15\000"
 .LASF275:
 	.ascii	"__ULFRACT_EPSILON__ 0x1P-32ULR\000"
-.LASF951:
+.LASF952:
 	.ascii	"AHB2RSTR\000"
 .LASF671:
 	.ascii	"__SCN8(x) __INT8 __STRINGIFY(x)\000"
@@ -5977,13 +5982,13 @@ main:
 	.ascii	"__LDBL_MIN__ 2.2250738585072014e-308L\000"
 .LASF445:
 	.ascii	"__ARM_FEATURE_CDE\000"
-.LASF979:
+.LASF980:
 	.ascii	"KEYR\000"
 .LASF509:
 	.ascii	"unsigned\000"
 .LASF381:
 	.ascii	"__GCC_DESTRUCTIVE_SIZE 64\000"
-.LASF937:
+.LASF938:
 	.ascii	"short int\000"
 .LASF835:
 	.ascii	"SCNuMAX __SCNMAX(u)\000"
@@ -6007,11 +6012,11 @@ main:
 	.ascii	"_ATTRIBUTE(attrs) __attribute__ (attrs)\000"
 .LASF443:
 	.ascii	"__ARM_FEATURE_COPROC\000"
-.LASF976:
+.LASF977:
 	.ascii	"GPIO_MODE_ANALOG\000"
 .LASF177:
 	.ascii	"__DBL_HAS_INFINITY__ 1\000"
-.LASF931:
+.LASF932:
 	.ascii	"TIM4 ((struct timer *) TIM4_BASE_ADDR)\000"
 .LASF95:
 	.ascii	"__SIG_ATOMIC_MAX__ 0x7fffffff\000"
@@ -6019,7 +6024,7 @@ main:
 	.ascii	"UINT64_MAX (__UINT64_MAX__)\000"
 .LASF471:
 	.ascii	"_RETARGETABLE_LOCKING 1\000"
-.LASF914:
+.LASF915:
 	.ascii	"FLASH_ACR_DCEN_BIT 10\000"
 .LASF453:
 	.ascii	"__USES_INITFINI__ 1\000"
@@ -6091,11 +6096,11 @@ main:
 	.ascii	"__LDBL_DECIMAL_DIG__ 17\000"
 .LASF701:
 	.ascii	"PRIXFAST8 __PRI8FAST(X)\000"
-.LASF1000:
+.LASF1001:
 	.ascii	"led_on\000"
 .LASF308:
 	.ascii	"__LACCUM_MIN__ (-0X1P31LK-0X1P31LK)\000"
-.LASF1002:
+.LASF1003:
 	.ascii	"src/main.c\000"
 .LASF126:
 	.ascii	"__INT_FAST8_MAX__ 0x7fffffff\000"
@@ -6133,13 +6138,13 @@ main:
 	.ascii	"__ULLFRACT_MIN__ 0.0ULLR\000"
 .LASF651:
 	.ascii	"_T_WCHAR_ \000"
-.LASF992:
+.LASF993:
 	.ascii	"BDTR\000"
 .LASF382:
 	.ascii	"__GCC_CONSTRUCTIVE_SIZE 64\000"
 .LASF664:
 	.ascii	"_BSD_WCHAR_T_\000"
-.LASF971:
+.LASF972:
 	.ascii	"PLLI2SCFGR\000"
 .LASF277:
 	.ascii	"__LLFRACT_IBIT__ 0\000"
@@ -6147,9 +6152,9 @@ main:
 	.ascii	"UINT16_C(x) __UINT16_C(x)\000"
 .LASF756:
 	.ascii	"PRIx32 __PRI32(x)\000"
-.LASF998:
+.LASF999:
 	.ascii	"tim4_init\000"
-.LASF947:
+.LASF948:
 	.ascii	"uint32_t\000"
 .LASF878:
 	.ascii	"RCC_PLLCFGR_PLLN_BIT 6\000"
@@ -6157,13 +6162,13 @@ main:
 	.ascii	"PRIxLEAST8 __PRI8LEAST(x)\000"
 .LASF506:
 	.ascii	"_SYS__INTSUP_H \000"
-.LASF981:
+.LASF982:
 	.ascii	"OPTCR\000"
 .LASF290:
 	.ascii	"__SACCUM_EPSILON__ 0x1P-7HK\000"
 .LASF415:
 	.ascii	"__GCC_ASM_FLAG_OUTPUTS__ 1\000"
-.LASF912:
+.LASF913:
 	.ascii	"FLASH_BASE_ADDR (0x40023C00U)\000"
 .LASF745:
 	.ascii	"SCNxFAST16 __SCN16FAST(x)\000"
@@ -6209,13 +6214,13 @@ main:
 	.ascii	"__PRI16(x) __INT16 __STRINGIFY(x)\000"
 .LASF159:
 	.ascii	"__FLT_HAS_DENORM__ 1\000"
-.LASF909:
+.LASF910:
 	.ascii	"PINNUM(pin) (pin & 0b1111)\000"
 .LASF768:
 	.ascii	"PRIXLEAST32 __PRI32LEAST(X)\000"
 .LASF171:
 	.ascii	"__DBL_MAX__ ((double)1.7976931348623157e+308L)\000"
-.LASF938:
+.LASF939:
 	.ascii	"short unsigned int\000"
 .LASF276:
 	.ascii	"__LLFRACT_FBIT__ 63\000"
@@ -6242,7 +6247,7 @@ main:
 	.ascii	"__SIZE_MAX__ 0xffffffffU\000"
 .LASF818:
 	.ascii	"PRIXFAST64 __PRI64FAST(X)\000"
-.LASF911:
+.LASF912:
 	.ascii	"FLASH_H_ \000"
 .LASF412:
 	.ascii	"__ARM_ARCH\000"
@@ -6260,7 +6265,7 @@ main:
 	.ascii	"SCNuFAST32 __SCN32FAST(u)\000"
 .LASF522:
 	.ascii	"long +4\000"
-.LASF950:
+.LASF951:
 	.ascii	"AHB1RSTR\000"
 .LASF723:
 	.ascii	"SCNx16 __SCN16(x)\000"
@@ -6270,7 +6275,7 @@ main:
 	.ascii	"__SCN64LEAST(x) __LEAST64 __STRINGIFY(x)\000"
 .LASF340:
 	.ascii	"__USQ_FBIT__ 32\000"
-.LASF1003:
+.LASF1004:
 	.ascii	"/home/alex/code/own/stm32-falling-sand\000"
 .LASF796:
 	.ascii	"PRIX64 __PRI64(X)\000"
@@ -6334,7 +6339,7 @@ main:
 	.ascii	"__INT_LEAST64_TYPE__ long long int\000"
 .LASF103:
 	.ascii	"__UINT16_MAX__ 0xffff\000"
-.LASF923:
+.LASF924:
 	.ascii	"PWR_BASE_ADDR (0x40007000U)\000"
 .LASF446:
 	.ascii	"__ARM_FEATURE_CDE_COPROC\000"
diff --git a/build/main.i b/build/main.i
index 8d199f6..f00220b 100644
--- a/build/main.i
+++ b/build/main.i
@@ -2128,7 +2128,9 @@ struct gpio {
 #define GPIO(port) ((struct gpio*)(uintptr_t)(GPIO_BASE_ADDR + (GPIO_PORT_OFFSET * port)))
 
 
-#define PIN(port,num) ((((port) - 'A') << 8) | num)
+#define PORT(port) (((port) - 'A') << 8)
+
+#define PIN(port,num) (PORT(port) | num)
 
 #define PINNUM(pin) (pin & 0b1111)
 
@@ -2143,9 +2145,9 @@ typedef enum {
 
 void gpio_set_mode(uint16_t pin, GPIO_MODE mode);
 void gpio_write(uint16_t pin, 
-# 39 "src/gpio.h" 3 4
+# 41 "src/gpio.h" 3 4
                              _Bool 
-# 39 "src/gpio.h"
+# 41 "src/gpio.h"
                                   val);
 # 6 "src/main.c" 2
 # 1 "src/flash.h" 1
diff --git a/build/main.o b/build/main.o
index 3cf9db8..e3c3732 100644
Binary files a/build/main.o and b/build/main.o differ
diff --git a/src/gpio.h b/src/gpio.h
index 3bc669e..bad0e48 100644
--- a/src/gpio.h
+++ b/src/gpio.h
@@ -21,8 +21,10 @@ struct gpio {
 #define GPIO_PORT_OFFSET (0x400U)
 #define GPIO(port) ((struct gpio*)(uintptr_t)(GPIO_BASE_ADDR + (GPIO_PORT_OFFSET * port)))
 
+// Create a 8bit number from a port
+#define PORT(port) (((port) - 'A') << 8)
 // Create a 16bit number from a port and pin
-#define PIN(port, num) ((((port) - 'A') << 8) | num)
+#define PIN(port, num) (PORT(port) | num)
 // get the lower byte from a PIN
 #define PINNUM(pin) (pin & 0b1111)
 // get the upper byte from a PIN