Function xs_arducam_read

modules/drivers/arducam/modArducam.c:263–335

}

void xs_arducam_read(xsMachine *the)
{
	ArduCAM ac = xsmcGetHostData(xsThis);
	int argc = xsmcArgc;
	int i;
	uint8_t data[4];
	uint8_t *buffer;
	int bufferSize = xsmcGetArrayBufferLength(xsArg(0));
	int readSize;

	if (1 == argc)
		readSize = bufferSize;
	else {
		readSize = xsmcToInteger(xsArg(1));
		if (readSize > bufferSize)
			readSize = bufferSize;
	}

	if (readSize > ac->bytesAvailable)
		readSize = ac->bytesAvailable;

	buffer = xsmcToArrayBuffer(xsArg(0));

#if 0
	if (ac->skipFirst) {
		readRegisterSPI_FIFO(ac);
		ac->skipFirst = 0;
	}

	for (i = 0; i < readSize; i += 1)
		*buffer++ = readRegisterSPI_FIFO(ac);
#else
	if (ac->startBurst) {
		data[0] = BURST_FIFO_READ;
		modSPITx(&ac->spiConfig, data, 1);
		ac->startBurst = 0;
	}

	if (ac->skipFirst) {
		uint8_t dummy = 0xff;
		modSPITxRx(&ac->spiConfig, &dummy, 1);
		ac->skipFirst = 0;
	}

	for (i = 0; i < readSize; ) {
		uint32_t temp32[64 / 4];
		uint8_t *temp8 = (uint8_t *)temp32;
		int use = readSize - i;
		if (use > 64) use = 64;

		modSPITxRx(&ac->spiConfig, temp8, use);

		if (ac->swap16) {
			uint8_t j;
			for (j = 0; j < use; j+= 2) {
				uint8_t temp = temp8[j];
				temp8[j] = temp8[j + 1];
				temp8[j + 1] = temp;