microscope-ring-light-remote-sw/systick.c

#include <systick.h>
#include <stm32f0xx.h>

static volatile uint32_t global_systick = 0;
static volatile uint32_t systick_wait_counter;
static volatile uint32_t blink_cntr = 0;
static volatile bool blink_state = false;

void systick_wait_ms(uint32_t ms)
{
	systick_wait_counter = ms;
	
	while (systick_wait_counter > 0)
		__WFI();
}

bool systick_get_blink_state(void)
{
	return blink_state;
}

uint32_t systick_get_global_tick(void)
{
	return global_systick;
}

void SysTick_Handler(void)
{
	global_systick++;
	systick_wait_counter--;
	if (++blink_cntr > 250ul) {
		blink_cntr = 0ul;
		blink_state = !blink_state;
	}
}