Add ws2812 Code

1 files changed, 76 insertions, 0 deletions

diff --git a/ws2812/main.c b/ws2812/main.c
new file mode 100644
index 0000000..926cd68
--- /dev/null
+++ b/ws2812/main.c
@@ -0,0 +1,76 @@
+
+
+#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");
+	}
+}