Method readMemoryBlock

Sming/Libraries/ArduCAM/ArduCAMStream.cpp:80–125

uint16_t ArduCAMStream::readMemoryBlock(char* data, int bufSize) {
	if(!dataReady()) {
		return 0;
	}

	if (!transfer) {
		transfer = true;

		myCAM->CS_LOW();
		myCAM->set_fifo_burst();
		// clear dummy byte -> send out LO and ignore MISO
		SPI.transfer(0x0);

		// send a BMP header for BMP files
		if (myCAM->get_format() == BMP) {
			hdump.print((unsigned char *)bmp_header, BMPIMAGEOFFSET);
			memcpy(data, (unsigned char *)bmp_header, BMPIMAGEOFFSET);
			return BMPIMAGEOFFSET;
		}

	}

	int bytesread = min(len, size_t(bufSize));

	ACAM_DEBUG("ArduCAMStream::readMemoryBlock [%d] (%d bytes) remaining (%d bytes)\n", bcount++, bytesread, len);

	// block read does overload the cam
//	HwSPI.recv((uint8_t *)data, bytesread);
//	SPI.transfer((unsigned char*)data, bytesread);

	// so we have to read single bytes
	for (int i=0; i< bytesread; i++) {
		data[i] = SPI.read8();
	}
	len = len - bytesread;

	if (len == 0) {
		ACAM_DEBUG("ArduCAMStream::readMemoryBlock -> eof");
		transfer = false;
		SPI.endTransaction();
		myCAM->CS_HIGH();
	}

	return bytesread;

}

bool ArduCAMStream::seek(int dist) {
//	ACAM_DEBUG("ArduCAMStream::seek (%d)\n", dist);