microscope-ring-light/firmware/main.c

#include <stm32f0xx.h>
#include <cmsis/core_cm0.h>

unsigned int i = 0x12345678;
unsigned char c = 2;

extern void sk6812_send_led(uint32_t rgbw);

volatile uint32_t wait_tick = 0;

static void wait_for_ticks(uint32_t ticks)
{
	wait_tick = 0;
	while (wait_tick < ticks);
}

int main(void)
{
	uint32_t led_val = 0xAAUL;

	RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
	GPIOA->MODER |= (1<<3*2);
	SysTick_Config(800000);
	while(1) {
		__disable_irq();
		sk6812_send_led(led_val);
		__enable_irq();
		wait_for_ticks(30);
		led_val += 20;
	}
}

void SysTick_Handler(void) {
	wait_tick++;
}