42 lines
656 B
C
42 lines
656 B
C
#include "cmsis.h"
|
|
#include "timer.h"
|
|
|
|
/* Mill second tick count */
|
|
volatile uint32_t timer_count = 0;
|
|
|
|
/* Timer interrupt handler */
|
|
void SysTick_Handler(void) {
|
|
timer_count++;
|
|
}
|
|
|
|
void timer_init(void)
|
|
{
|
|
timer_count = 0;
|
|
SysTick_Config(SystemCoreClock / 1000); /* 1ms tick */
|
|
}
|
|
|
|
void timer_clear(void)
|
|
{
|
|
timer_count = 0;
|
|
}
|
|
|
|
uint16_t timer_read(void)
|
|
{
|
|
return (uint16_t)(timer_count & 0xFFFF);
|
|
}
|
|
|
|
uint32_t timer_read32(void)
|
|
{
|
|
return timer_count;
|
|
}
|
|
|
|
uint16_t timer_elapsed(uint16_t last)
|
|
{
|
|
return TIMER_DIFF_16(timer_read(), last);
|
|
}
|
|
|
|
uint32_t timer_elapsed32(uint32_t last)
|
|
{
|
|
return TIMER_DIFF_32(timer_read32(), last);
|
|
}
|