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#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include "ws2812.h"
#define DELAY 90000 // 18,000,000 nops are one second @ 72 MHz (one nop --> 4 clock cycles)
#define BRIGHTNESS 30
#define LED_ARRAY_LENGTH 3
void clock_init(void);
void gpio_init(void);
void delay(void);
int main(void)
{
clock_init();
gpio_init();
uint8_t led_array_buffer[LED_ARRAY_LENGTH*WS2812_NUMBER_OF_COLORS];
WS2812_ARRAY led_panel;
ws2812_init(&led_panel, GPIOB, GPIO13, (uint8_t *)led_array_buffer, LED_ARRAY_LENGTH);
while(1)
{
for (uint16_t i=0; i<=BRIGHTNESS; i++)
{
ws2812_set_array_led(&led_panel, 0, i, 0, 0);
ws2812_set_array_led(&led_panel, 1, 0, i, 0);
ws2812_set_array_led(&led_panel, 2, 0, 0, i);
ws2812_write_leds(&led_panel);
delay();
}
for (uint16_t i=BRIGHTNESS; i>0; i--)
{
ws2812_set_array_led(&led_panel, 0, i, 0, 0);
ws2812_set_array_led(&led_panel, 1, 0, i, 0);
ws2812_set_array_led(&led_panel, 2, 0, 0, i);
ws2812_write_leds(&led_panel);
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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