Function dotstarSend_16LE

modules/drivers/dotstar/modDotstar.c:221–254

caller provides little-endian pixels @@ could double buffer "buffer" to get some aysnc sending in this loop

// caller provides little-endian pixels
//@@ could double buffer "buffer" to get some aysnc sending in this loop
void dotstarSend_16LE(PocoPixel *pixels, int byteLength, void *refcon)
{
	spiDisplay sd = refcon;
	uint8_t *brightness = sd->brightness;

	if (byteLength < 0) byteLength = -byteLength;
	while (byteLength > 0) {
		uint8_t buffer[16 * 4];
		uint8_t *bgr = buffer;
		uint16_t count = (byteLength >= 32) ? 32 : byteLength;
		uint16_t counter = count >> 1;

		while (counter--) {
			PocoPixel pixel = *pixels++;
			uint8_t t;

			*bgr++ = 0xff;

			t = pixel & 0x1F;
			*bgr++ = brightness[(t << 3) | (t >> 3)];

			t = (pixel >> 5) & 0x3F;
			*bgr++ = brightness[(t << 2) | (t >> 4)];

			t = pixel >> 11;
			*bgr++ = brightness[(t << 3) | (t >> 3)];
		}

		modSPITx(&sd->spiConfig, (void *)buffer, count << 1);
		modSPIFlush();

		byteLength -= count;
	}
}

void dotstarChipSelect(uint8_t active, modSPIConfiguration config)
{