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TIM4 runs at 96MHz, not 48MHz

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Alexander Heldt
2024-12-30 11:45:04 +01:00
parent 8f3285072b
commit a1c43ad21c
5 changed files with 4 additions and 4 deletions
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BIN
build/final.elf
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2
build/timer.S
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@@ -56,7 +56,7 @@ tim4_init:
.loc 1 14 35
ldr r3, .L2+4
.loc 1 14 41
movw r2, #47999
movw r2, #30463
str r2, [r3, #40]
.loc 1 17 35
ldr r3, .L2+4

2
build/timer.i
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@@ -2137,7 +2137,7 @@ void tim4_init(void) {
((struct timer *) (0x40000800U))->PSC = (uint16_t) 48000 - 1;
((struct timer *) (0x40000800U))->PSC = (uint16_t) 96000 - 1;
((struct timer *) (0x40000800U))->ARR = (uint16_t) 0xFFFF;

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build/timer.o
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4
src/timer.c
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@@ -10,8 +10,8 @@ void tim4_init(void) {
TIM4->CR2 = 0x0000;
// Set prescaler
// f_clk = 48MHz -> /48000 = 1KHz counting frequency = 1ms
TIM4->PSC = (uint16_t) 48000 - 1;
// f_clk = 96MHz -> 96E6/96E3 = 1E3 = 1KHz counting frequency = 1ms
TIM4->PSC = (uint16_t) 96000 - 1;
// Set ARR to maximum value to get 1ms between updates
TIM4->ARR = (uint16_t) 0xFFFF;