flipperzero-firmware/firmware/targets/f5/api-hal/api-hal-delay.c

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#include "api-hal-delay.h"
#include <furi.h>
#include <cmsis_os2.h>
static uint32_t clk_per_microsecond;
void delay_us_init_DWT(void) {
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
DWT->CYCCNT = 0U;
clk_per_microsecond = SystemCoreClock / 1000000.0f;
}
void delay_us(float microseconds) {
uint32_t start = DWT->CYCCNT;
uint32_t time_ticks = microseconds * clk_per_microsecond;
while((DWT->CYCCNT - start) < time_ticks) {
};
}
// cannot be used in ISR
// TODO add delay_ISR variant
void delay(float milliseconds) {
uint32_t ticks = milliseconds / (1000.0f / osKernelGetTickFreq());
osStatus_t result = osDelay(ticks);
(void)result;
furi_assert(result == osOK);
}