- blackbox interface

git-svn-id: https://svn.code.sf.net/p/libusbjava/code/trunk@72 94ad28fe-ef68-46b1-9651-e7ae4fcf1c4c

mcdp/src/ch/ntb/mcdp/uart/blackbox/Uart0.java

@@ -0,0 +1,74 @@
+package ch.ntb.mcdp.uart.blackbox;
+
+import ch.ntb.mcdp.uart.UartDispatch;
+import ch.ntb.mcdp.usb.DataPacket;
+import ch.ntb.mcdp.usb.Dispatch;
+import ch.ntb.mcdp.usb.USBDevice;
+import ch.ntb.usb.USBException;
+
+public class Uart0 {
+
+	// UART 0 Subtypes
+	/**
+	 * Data to UART 0
+	 */
+	private static final byte STYPE_UART_0_IN = 0x11;
+
+	public static final int MAX_UART_PAYLOAD = UartDispatch.MAX_UART_PAYLOAD;
+
+	private static void write(byte packetSubType, byte[] data, int len)
+			throws USBException {
+		byte[] usbData = new byte[len + DataPacket.PACKET_MIN_LENGTH];
+		usbData[0] = DataPacket.PACKET_HEADER;
+		usbData[1] = Dispatch.MTYPE_UART;
+		usbData[2] = packetSubType;
+		usbData[3] = (byte) (len / 0x100);
+		usbData[4] = (byte) (len & 0xFF);
+		for (int i = 0; i < len; i++) {
+			usbData[DataPacket.PACKET_DATA_OFFSET + i] = data[i];
+		}
+		usbData[DataPacket.PACKET_DATA_OFFSET + len] = DataPacket.PACKET_END;
+		USBDevice.write_BDI(usbData, usbData.length);
+	}
+
+	/**
+	 * Write a Uart data-packet to the target. The maximal number of bytes is
+	 * specified by <code>MAX_UART_PAYLOAD</code>. If more data is sent in
+	 * one packet, only <code>MAX_UART_PAYLOAD</code> bytes are forwarded to
+	 * the uart.
+	 * 
+	 * @param data
+	 *            The data to be sent.
+	 * @param len
+	 *            Length of the data to be sent.
+	 * @return true if the data has been sent successfully
+	 */
+	public static boolean write(byte[] data, int len) {
+		try {
+			write(STYPE_UART_0_IN, data, len);
+		} catch (USBException e) {
+			return false;
+		}
+		return true;
+	}
+
+	/**
+	 * Try to read uart data from the device.
+	 * 
+	 * @return uart data or null if no data is available or an exception occured
+	 */
+	public static byte[] read() {
+		DataPacket packet;
+		try {
+			System.out.print("Data: ");
+			packet = Dispatch.readUART();
+			for (int i = 0; i < packet.data.length; i++) {
+				System.out.print((char) packet.data[i] + ", ");
+			}
+			System.out.println();
+			return packet.data;
+		} catch (Exception e) {
+			return null;
+		}
+	}
+}