// HC11Boot.java: bootstrap program for loading code into HC11
// Fred Martin / UML CS / last modified Mon Sep 29 08:35:40 2003
//
// put the bytes you want installed into HC11 internal RAM
// into "buf" object beginning at buf[0].  

class HC11Boot {
    private static Serial s;

    public static void main(String[] argv) {
	setup(argv);	// select serial port and init Serial object
	System.out.println("Using serial port " + s.getPortName());

	// make 512 byte buffer and fill with zeroes
	byte[] buf= new byte[512];
	int i;
	for (i=0; i<512; i++) buf[i] = 0;

	// this 3-instruction program will turn on bit 4 of PORTA (PA4)
	// and then loop endlessly
	i=0;
	buf[i++] = (byte)0x86;  // RAM loc 0 -- LDAA with 0x10
	buf[i++] = (byte)0x10;  //         1         0x10 (bit 4 on)
	buf[i++] = (byte)0xb7;  //         2 -- STAA extended to 0x1000
	buf[i++] = (byte)0x10;  //         3         0x10
	buf[i++] = (byte)0x00;  //         4         0x00  (the PORTA reg)
	buf[i++] = (byte)0x7e;  //         5 -- JMP extended to 0x0005
	buf[i++] = (byte)0x00;  //         6         0x00
	buf[i++] = (byte)0x05;  //         7         0x05 (loop the JMP!)

	System.out.println("Serial port is open.  Turn on HC11 and press <ENTER> to continue...");
	try {
	    System.in.read();
	} catch (Exception e) {
	    e.printStackTrace();
	}

	System.out.println("Writing to serial line...");
	try {
	    s.put(0xff);	// send baud rate detect byte
	    s.put(buf);		// dump 512 bytes to serial port
	} catch (Exception e) {
	    e.printStackTrace();
	}
	s.flush(); // make sure all chars get out before exiting
	System.out.println("done.");
    }

    private static void setup(String[] args) {
	if (args.length == 0) {
	    System.out.println("Usage: HC11Boot serial-port");
	    s = new Serial();
	    String[] ports=s.portsAvailable();
	    int nPorts= ports.length;
	    System.out.println("Available ports are:");
	    for (int i=0; i< nPorts; i++) {
		System.out.println("  " + ports[i] + " ");
	    }
	    System.out.println();
	    System.exit(0);
	}
	s = new Serial(args[0]);
    }
}