Subversion Repositories adv_debug_sys

////////////////////////////////////////////////////////////////

//

// WriteRegisterTransaction.java

//

// Copyright (C) 2010 Nathan Yawn 

//                    (nyawn@opencores.org)

//

// This class defines a transaction object which is passed to

// the RSP coder in order to perform a register write 

// transaction.

//

////////////////////////////////////////////////////////////////

//

// This source file may be used and distributed without

// restriction provided that this copyright statement is not

// removed from the file and that any derivative work contains

// the original copyright notice and the associated disclaimer.

// 

// This source file is free software; you can redistribute it

// and/or modify it under the terms of the GNU General

// Public License as published by the Free Software Foundation;

// either version 3.0 of the License, or (at your option) any

// later version.

//

// This source is distributed in the hope that it will be

// useful, but WITHOUT ANY WARRANTY; without even the implied 

// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR

// PURPOSE.  See the GNU Lesser General Public License for more

// details.

// 

// You should have received a copy of the GNU General

// Public License along with this source; if not, download it 

// from http://www.gnu.org/licenses/gpl.html

//

////////////////////////////////////////////////////////////////

package advancedWatchpointControl;

public class WriteRegisterTransaction implements TargetTransaction {

                private String packetString = null;

        public WriteRegisterTransaction(targetDebugRegisterSet.regType reg, long val) {

                packetString = new String("P"); // 'P' is write one register

                int regAddr = targetDebugRegisterSet.getRegisterAddress(reg);

                packetString += Integer.toHexString(regAddr);

                packetString += "=";

                String valueStr = Long.toHexString(val);

                // There must be 8 bytes of 'value'

                if(valueStr.length() > 8) {

                        // Use the last 8 bytes, the first 8 may just be a sign extension

                        valueStr = valueStr.substring(valueStr.length() - 8, valueStr.length());

                }

                int padsize = 8 - valueStr.length();

                for(int i = 0; i < padsize; i++) {

                        packetString += '0';

                }

                packetString += valueStr;

        }

        @Override

        public String getDataToSend() {

                return packetString;

        }

        @Override

        public boolean receivePacket(String pkt) {

                // Only one valid response from a register write: "OK"

                if(pkt.charAt(0) == 'O' && pkt.charAt(1) == 'K') {

                        return true;

                }

                return false;

        }

}