djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cleanup in tick.c

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
ports/atmel-samd/tick.c
View File

@ -60,15 +60,13 @@ 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)) {}
}
while (SysTick->VAL > ((us_until_next_tick - us) * ticks_per_us)) {}
}
// us counts down!