Neopixel Send Byte

neopixel-fragment.c

void send_byte(unsigned char byte){
    /*
    Send a byte to the Neopixel matrix, timings extracted from Neopixel manual

    value: unsigned char -> one byte value, will be sent as bits from Neopixel pin
    */
	for(unsigned char i = 0; i < 8; i++){
		if(byte & 1<<i){
			HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);
			for (volatile unsigned char i = 0; i < 4; i++); //~700ns
			HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET);
			for (volatile unsigned char i = 0; i < 3; i++); //~600ns
		} else {
			HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);
			for (volatile unsigned char i = 0; i < 1; i++); //~350ns
			HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET);
			for (volatile unsigned char i = 0; i < 4; i++); //~800ns
		}
	}
}