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add compenstation, PERF_CNT_DELAY_US_COMPENSATION, to delay_us

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This commit is contained in:
Gabriel Wang 2021-01-14 12:49:23 +00:00
parent e14804538f
commit e8f3f02300
1 changed files with 11 additions and 1 deletions
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10
perf_counter.c
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@ -26,6 +26,10 @@
# define PERF_CNT_COMPENSATION_THRESHOLD 16 # define PERF_CNT_COMPENSATION_THRESHOLD 16
#endif #endif
#ifndef PERF_CNT_DELAY_US_COMPENSATION
# define PERF_CNT_DELAY_US_COMPENSATION 20
#endif
/*============================ MACROS ========================================*/ /*============================ MACROS ========================================*/
/* IO definitions (access restrictions to peripheral registers) */ /* IO definitions (access restrictions to peripheral registers) */
/** /**
@ -297,6 +301,12 @@ void delay_us(int32_t iUs)
{ {
iUs *= SystemCoreClock / 1000000ul; iUs *= SystemCoreClock / 1000000ul;
if (iUs <= PERF_CNT_DELAY_US_COMPENSATION) {
return ;
}
iUs -= PERF_CNT_DELAY_US_COMPENSATION;
start_cycle_counter(); start_cycle_counter();
while(stop_cycle_counter() < iUs); while(stop_cycle_counter() < iUs);
} }