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Make stk_read function usable

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This function used to return the raw current value, but that exposes the
prescaling used internaly
This commit is contained in:
Steins7 2024-04-30 20:17:58 +02:00
parent 432310a52d
commit 34fb4dac76
3 changed files with 10 additions and 7 deletions
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11
drv/stk.c
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@ -21,6 +21,7 @@ static volatile struct STK* regs = (struct STK*)STK_BASE_ADDRESS;
//--local variables-------------------------------------------------------------
static StkCallback callback;
static uint32_t prescaler;
//--public functions------------------------------------------------------------
@ -32,10 +33,12 @@ uint32_t stk_configure(uint32_t period_us, StkCallback cb)
struct RccClocks clocks;
rcc_get_clocks(&clocks);
uint32_t reload = period_us * (clocks.ahb_freq / 1000000 / 8);
uint32_t prescaler = (clocks.ahb_freq / 1000000 / 8);
uint32_t reload = period_us * prescaler;
if (reload < 1) {
//period is too small, try using the non-prescaled clock
reload = period_us * (clocks.ahb_freq / 1000000);
prescaler *= 8;
reload = period_us * prescaler;
if (reload < 1) {
//period is still too small
return 1;
@ -71,9 +74,9 @@ void stk_stop(void)
reg_reset(regs->CTRL, STK_CTRL_ENABLE);
}
uint32_t stk_read(void)
uint32_t stk_read_us(void)
{
return regs->VAL.word & 0x00FFFFFF;
return (regs->VAL.word & 0x00FFFFFF) / prescaler;
}

4
drv/stk.h
View File

@ -46,9 +46,9 @@ void stk_start(void);
void stk_stop(void);
/**
* Read the current value of the timer's counter
* Read the current value of the timer's counter in µs
*/
uint32_t stk_read(void);
uint32_t stk_read_us(void);
#endif //_STK_H_

2
srv/task.c
View File

@ -73,7 +73,7 @@ void task_start_scheduler(void)
stk_start();
__asm("wfi");
stk_stop();
uint32_t stk_delay = stk_read();
uint32_t stk_delay = stk_read_us();
if (stk_delay != 0) {
delay = stk_delay;
}