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Source code

/* Reads the number and positioning of the devices attached to the backplane.
 * and returns it to the PC for viewing. This command must be run when the device is connected
 * and prior to reading back any data. This is because the PIC firmware relys on being able to interogate
 * the pinTable to see which devices constitute a "frame" depending on how many cards are plugged into the backplane
 */
QVector< QVector<unsigned char> > UsbConnection::readTable()
	{
	unsigned char OutputPacketBuffer[64] = {0};
	unsigned char InputPacketBuffer[64] = {0};
	int transferedBuffer;
	unsigned char i,j;

	QVector < unsigned char > usbDataInBuffer;
	QVector< QVector< unsigned char > > pinTable;

	// use this function to read back the device info from one of the modules
	OutputPacketBuffer[0] = 0x83;
	libusb_bulk_transfer(handle,  EP_OUT, &OutputPacketBuffer[0], 64, &transferedBuffer, 1000);

	for(i=0;i<2;i++)
	{
		libusb_bulk_transfer(handle, EP_IN, &InputPacketBuffer[0],64, &transferedBuffer, 1000);
		for(j=0;j<64;j++)
		{
			usbDataInBuffer.push_back(InputPacketBuffer[j]);
		}
		pinTable.append(usbDataInBuffer);
	}

	return pinTable;
	}