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Refactoring #285

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Signed-off-by: Krzysiek Egzmont <egzumer@gmail.com>
This commit is contained in:
Juan Antonio
2023-12-16 18:34:05 +01:00
committed by Krzysiek Egzmont
parent e7a21c470f
commit 2a75f8a9be
6 changed files with 213 additions and 215 deletions
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30
driver/systick.c
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@@ -15,8 +15,8 @@
*/
#include "ARMCM0.h"
#include "driver/systick.h"
#include "misc.h"
#include "systick.h"
#include "../misc.h"
// 0x20000324
static uint32_t gTickMultiplier;
@@ -29,17 +29,21 @@ void SYSTICK_Init(void)
void SYSTICK_DelayUs(uint32_t Delay)
{
const uint32_t ticks = Delay * gTickMultiplier;
uint32_t i = 0;
uint32_t Start = SysTick->LOAD;
uint32_t Previous = SysTick->VAL;
const uint32_t ticks = Delay * gTickMultiplier;
uint32_t elapsed_ticks = 0;
uint32_t Start = SysTick->LOAD;
uint32_t Previous = SysTick->VAL;
do {
uint32_t Current;
uint32_t Delta;
while ((Current = SysTick->VAL) == Previous) {}
Delta = (Current < Previous) ? -Current : Start - Current;
i += Delta + Previous;
Previous = Current;
} while (i < ticks);
}
do {
Current = SysTick->VAL;
} while (Current == Previous);
uint32_t Delta = ((Current < Previous) ? - Current : Start - Current);
elapsed_ticks += Delta + Previous;
Previous = Current;
} while (elapsed_ticks < ticks);
}