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#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include "ws2812.h"
#define DELAY 30000 // 18,000,000 nops are one second
#define BRIGHTNESS 100
void clock_init(void);
void gpio_init(void);
void delay(void);
ws2812_init_typedef ws2812;
int main(void)
{
clock_init();
gpio_init();
ws2812_init(&ws2812, GPIOB, GPIO13, 1, 1);
while(1){
/*ws2812_send_led(&ws2812, BRIGHTNESS, 0, 0);
delay();
ws2812_send_led(&ws2812, 0, BRIGHTNESS, 0);
delay();
ws2812_send_led(&ws2812, 0, 0, BRIGHTNESS);
delay();
ws2812_send_led(&ws2812, BRIGHTNESS, BRIGHTNESS, BRIGHTNESS);
delay();*/
for (uint16_t i=0; i<=255; i++){
ws2812_send_led(&ws2812, i, 0, 0);
delay();
}
for (uint16_t i=255; i>0; i--){
ws2812_send_led(&ws2812, i, 0, 0);
delay();
}
}
return 0;
}
void clock_init(void)
{
rcc_clock_setup_in_hse_12mhz_out_72mhz();
rcc_periph_clock_enable(RCC_GPIOB); // for ws2812
rcc_periph_clock_enable(RCC_GPIOC); // for PC13 blinking
}
void gpio_init(void)
{
// on board led blinking
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
gpio_set(GPIOC, GPIO13);
// ws2812 output pin
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
gpio_set(GPIOB, GPIO13);
}
void delay(void)
{
for (int i = 0; i < DELAY; i++) {
__asm__("nop");
}
}
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