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

Update SystemCoreClock macro

Browse Source
This commit is contained in:
Hierophect 2019-07-24 16:31:25 -04:00
parent a63df51893
commit 295afaaf6c
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
ports/stm32f4/tick.c
View File

@ -55,12 +55,12 @@ void SysTick_Handler(void) {
}
void tick_init() {
uint32_t ticks_per_ms = 16000000/ 1000;
uint32_t ticks_per_ms = SystemCoreClock/ 1000;
SysTick_Config(ticks_per_ms); // interrupt is enabled
}
void tick_delay(uint32_t us) {
uint32_t ticks_per_us = 16000000 / 1000 / 1000;
uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
uint32_t us_between_ticks = SysTick->VAL / ticks_per_us;
uint64_t start_ms = ticks_ms;
while (us > 1000) {
@ -74,12 +74,12 @@ void tick_delay(uint32_t us) {
// us counts down!
void current_tick(uint64_t* ms, uint32_t* us_until_ms) {
uint32_t ticks_per_us = 16000000 / 1000 / 1000;
uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
*ms = ticks_ms;
*us_until_ms = SysTick->VAL / ticks_per_us;
}
void wait_until(uint64_t ms, uint32_t us_until_ms) {
uint32_t ticks_per_us = 16000000 / 1000 / 1000;
uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
while(ticks_ms <= ms && SysTick->VAL / ticks_per_us >= us_until_ms) {}
}