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cleanup in tick.c

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This commit is contained in:
Jerry Needell 2018-04-20 15:23:03 -04:00
parent fe738598da
commit bef05ffbf1
1 changed files with 2 additions and 4 deletions
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4
ports/atmel-samd/tick.c
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@ -60,16 +60,14 @@ void tick_delay(uint32_t us) {
uint32_t ticks_per_us = common_hal_mcu_processor_get_frequency() / 1000 / 1000;
uint32_t us_until_next_tick = SysTick->VAL / ticks_per_us;
uint32_t start_tick;
while (us > us_until_next_tick) {
while (us >= us_until_next_tick) {
start_tick=SysTick->VAL; // wait for SysTick->VAL to RESET
while (SysTick->VAL < start_tick) {}
us -= us_until_next_tick;
us_until_next_tick = 1000;
}
if(us){
while (SysTick->VAL > ((us_until_next_tick - us) * ticks_per_us)) {}
}
}
// us counts down!
void current_tick(uint64_t* ms, uint32_t* us_until_ms) {