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GREFwTool/source/greparser.cpp

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/* greparser.cpp - A simple GRE message generator/parser class
Copyright 2016 Eric A. Cottrell <eric.c.boston@gmail.com>
This file is part of GREFwTool. Source code is available at https://github.com/LinuxSheeple-E/GREFwTool
GREFwTool 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 of the License, or
(at your option) any later version.
GREFwTool 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GREFwTool. If not, see <http://www.gnu.org/licenses/>.
*/
#include "include/greparser.h"
#include <QString>
#include <QStringList>
#include <QDateTime>
#include <QTimer>
/* Constructor
*/
GREParser::GREParser(QObject *parent) : QObject(parent)
{
commandData.clear();
responseData.clear();
mode = MODE_WAIT_START;
bootloaderActive = false;
}
/* Destructor
*/
GREParser::~GREParser()
{
}
/* initialize - initalize data and start bootloader check timer
*/
void GREParser::initialize()
{
bootloaderActive = false;
commandData.clear();
responseData.clear();
mode = MODE_WAIT_START;
QTimer::singleShot(2000, this, initializeWork); // give time for parser to detect if Bootloader is active
}
/* initializeWork - complete initialize function after delay to check for active bootloader
Bootloader has a very limited command set and invalid commands can cause firmware erasure.
*/
void GREParser::initializeWork()
{
if(bootloaderActive)
{
requestVersion();
}
else
{
setCCDump(false);
getPowerStatus();
requestVersion();
}
}
/* setCCDump - Command to enable/disable CCDump in the scanner
*/
void GREParser::setCCDump(bool enable)
{
QByteArray command("C");
command.append(static_cast<unsigned char>((enable)?1:0));
processCommand(command);
}
/* getStatus - Command to get status information from the scanner
*/
void GREParser::getStatus(void )
{
QByteArray command("A");
processCommand(command);
}
/* getLed - command to get LCD display information from the scanner
*/
void GREParser::getLcd(void )
{
QByteArray command("L");
processCommand(command);
}
/* getPowerStatus - command to get power status from the scanner
*/
void GREParser::getPowerStatus(void )
{
QByteArray command("P");
processCommand(command);
}
/* requestVersion - command to request version information from the scanner
The format of the command is slightly different when bootloader is active
*/
void GREParser::requestVersion(void )
{
QByteArray command("V");
if(bootloaderActive == false)
command.append('\0');
processCommand(command);
}
/* clearPassword - command to clear the scanner password
*/
void GREParser::clearPassword(void )
{
QByteArray command("p");
processCommand(command);
}
/* sendPacket - send a data packet to the scanner
*/
void GREParser::sendPacket(const QByteArray &data)
{
processCommand(data);
}
/* sendAck - send a packet acknowledgement to the scanner
*/
void GREParser::sendAck(void )
{
QByteArray ack(1, static_cast<char>(0x06) );
emit sendData(ack);
}
/* sendNak - send a packet negative acknowledgement to the scanner
*/
void GREParser::sendNak(void )
{
QByteArray nak(1,static_cast<char>(0x15));
emit sendData(nak);
}
/* setDateTime - send the date and time to the scanner
*/
void GREParser::setDateTime(const QDateTime &datetime)
{
unsigned char uc;
QByteArray command("t");
uc = datetime.time().second() & 0xff;
command.append(uc);
uc = (datetime.time().second() >> 8) & 0xff;
command.append(uc);
uc = datetime.time().minute() & 0xff;
command.append(uc);
uc = (datetime.time().minute() >> 8) & 0xff;
command.append(uc);
uc = datetime.time().hour() & 0xff;
command.append(uc);
uc = (datetime.time().hour() >> 8) & 0xff;
command.append(uc);
uc = datetime.date().day() & 0xff;
command.append(uc);
uc = (datetime.date().day() >> 8) & 0xff;
command.append(uc);
uc = (datetime.date().month() - 1) & 0xff;
command.append(uc);
uc = ((datetime.date().month() - 1) >> 8) & 0xff;
command.append(uc);
uc = (datetime.date().year() - 1900) & 0xff;
command.append(uc);
uc = ((datetime.date().year() - 1900) >> 8) & 0xff;
command.append(uc);
uc = datetime.date().dayOfWeek() & 0xff;
command.append(uc);
uc = (datetime.date().dayOfWeek() >> 8) & 0xff;
command.append(uc);
uc = datetime.date().dayOfYear() & 0xff;
command.append(uc);
uc = (datetime.date().dayOfYear() >> 8) & 0xff;
command.append(uc);
command.append(static_cast<unsigned char>(datetime.isDaylightTime())?1:0);
uc = 0;
command.append(uc);
processCommand(command);
}
/* receiveData - receive data from the scanner
*/
void GREParser::receiveData(QByteArray &data)
{
processResponse(data);
}
/* processCommand - packetize the data and send to the scanner
*/
void GREParser::processCommand(const QByteArray &data)
{
unsigned char checksum;
commandData.clear();
if(data.isEmpty())
return;
commandData[0] = 0x02; // packet start
checksum = 0x03; // initialize to include data end byte
for(QByteArray::const_iterator it = data.cbegin(); it != data.cend(); it++)
{
checksum += *it;
commandData.append(*it);
}
commandData.append((unsigned char)0x03);
commandData.append(checksum);
emit sendData(commandData);
}
/* processResponse - process the scanner responseData
This function tries to determine the type of data and act based on the type
*/
void GREParser::processResponse(const QByteArray &data)
{
static int dataLength = -1;
static unsigned char checksum = 0;
static int updateFlagCount = 0;
unsigned char uc;
if(data.isEmpty())
return;
for(QByteArray::const_iterator it = data.cbegin(); it != data.cend(); it++)
{
switch(mode)
{
case MODE_WAIT_START: // Not in a packet, so wait for start
switch (*it)
{
case 0x02: // packet start
updateFlagCount = 0;
mode = MODE_RESPONSE_START;
break;
case 0x04: // Firmware update complete indication
updateFlagCount = 0;
emit updateEOT();
break;
case 0x05: // Firmware update wait indication
updateFlagCount = 0;
emit updateEnq();
break;
case 0x06: // Packet Acknowledgement indication
updateFlagCount = 0;
emit updateAck();
break;
case 0x10: // Firmware update start indication
updateFlagCount = 0;
emit updateDLE();
break;
case 0x15: // Packet Negative Acknowledgement indication
updateFlagCount = 0;
emit updateNak();
break;
case 0x18: // Firmware update cancel indication
updateFlagCount = 0;
emit updateCan();
break;
case 'C': // CPU update mode indication
if((bootloaderActive == false) && (++updateFlagCount == 3))
{
bootloaderActive = true;
emit updateCpuUpdateMode();
}
break;
default:
updateFlagCount = 0;
// Simple check if scanner is doing CCDUMP
if(data.contains(":"))
{
lastCCDump.clear();
lastCCDump.append(*it);
mode = MODE_CCDUMP_START;
}
break;
}
break;
case MODE_RESPONSE_START: // Check command code at the beginning of the packet
responseData.clear();
mode = MODE_RESPONSE_DATA;
responseData.append(*it);
checksum = *it;
switch (responseData.at(0))
{
case 'A': // Get Status
dataLength = 17;
break;
case 'L': // Get LCD
dataLength = 100;
break;
case 'P': // Get Power Status
dataLength = 2;
break;
case 'V': // Version
dataLength = 14;
break;
default:
dataLength = -1;
break;
}
break;
case MODE_RESPONSE_DATA: // in the data packet
checksum += *it;
// check the length for packets with a known length and for end of data indicatior
if((dataLength == -1) && (*it == 0x03)) // Bootloader responses
{
mode = MODE_RESPONSE_DATA_END;
}
else if(responseData.length() == dataLength)
{
if(*it == 0x03)
{
mode = MODE_RESPONSE_DATA_END;
}
else
{
responseData.clear();
mode = MODE_WAIT_START;
}
}
else
{
responseData.append(*it);
}
break;
case MODE_RESPONSE_DATA_END: // End of the packet
uc = *it;
// check the data and decode if good
if(checksum == uc)
{
switch (responseData.at(0))
{
case 'A': // Get Status
lastGetStatusVal.mode = responseData.at(1);
lastGetStatusVal.flags = responseData.at(2);
lastGetStatusVal.usbPower = (responseData.at(4) & 0x80)?true:false;
lastGetStatusVal.battery = (responseData.at(3) | (responseData.at(4) << 8)) & 0x7FFF;
lastGetStatusVal.rssi = (responseData.at(5) | (responseData.at(6) << 8));
lastGetStatusVal.zeromatic = (responseData.at(7) | (responseData.at(8) << 8));
lastGetStatusVal.rLed = responseData.at(9);
lastGetStatusVal.gLed = responseData.at(10);
lastGetStatusVal.bLed = responseData.at(11);
lastGetStatusVal.frequency = responseData.at(12) | (responseData.at(13) << 8) ||
(responseData.at(14) << 16) | (responseData.at(15) << 24);
lastGetStatusVal.rxmode = responseData.at(17);
emit updateStatus(lastGetStatusVal);
break;
case 'L': // Get LCD
lastGetLCDVal.lcd = responseData.mid(1,97);
lastGetLCDVal.icons = responseData.right(3);
emit updateLCD(lastGetLCDVal);
break;
case 'P': // Get Power Status
lastPowerStatusVal = (responseData.at(1))?true:false;
emit updatePowerStatus(lastPowerStatusVal);
break;
case 'V': // Version
lastVersionVal.model = responseData.mid(2, 8);
uc = responseData.at(10);
switch(uc)
{
case 0:
lastVersionVal.ver1 = QString("Boot N/A");
break;
case 255:
lastVersionVal.ver1 = QString("Boot Erased");
break;
default:
lastVersionVal.ver1 = QString("Boot %1.%2").arg(uc >> 4, 0, 16).arg(uc & 0xF, 0, 16);
break;
}
uc = responseData.at(11);
switch(uc)
{
case 0:
lastVersionVal.ver2 = QString("CPU N/A");
break;
case 255:
lastVersionVal.ver2 = QString("CPU Erased");
break;
default:
lastVersionVal.ver2 = QString("CPU %1.%2").arg(uc >> 4, 0, 16).arg(uc & 0xF, 0, 16);
break;
}
uc = responseData.at(12);
switch(uc)
{
case 0:
lastVersionVal.ver3 = QString("DSP N/A");
break;
case 255:
lastVersionVal.ver3 = QString("DSP Erased");
break;
default:
lastVersionVal.ver3 = QString("DSP %1.%2").arg(uc >> 4, 0, 16).arg(uc & 0xF, 0, 16);
break;
}
uc = responseData.at(13);
switch(uc)
{
case 0:
lastVersionVal.ver4 = QString("Voc N/A");
break;
case 255:
lastVersionVal.ver4 = QString("Voc Erased");
break;
default:
lastVersionVal.ver4 = QString("Voc %1.%2").arg(uc >> 4, 0, 16).arg(uc & 0xF, 0, 16);
break;
}
emit updateVersion(lastVersionVal);
break;
default:
// bootloader only returns version information
if(bootloaderActive)
{
lastVersionVal.model.clear();
if((responseData.at(0) == QLatin1Char('F')) && (responseData.at(0) == responseData.at(1)))
lastVersionVal.ver1 = QString("Boot Erased"); // Impossible case
else
lastVersionVal.ver1 = QString("Boot %1.%2").arg(responseData.at(0)).arg(responseData.at(1));
if((responseData.at(2) == QLatin1Char('F')) && (responseData.at(2) == responseData.at(3)))
lastVersionVal.ver2 = QString("CPU Erased");
else
lastVersionVal.ver2 = QString("CPU %1.%2").arg(responseData.at(2)).arg(responseData.at(3));
lastVersionVal.ver3.clear();
lastVersionVal.ver4.clear();
emit updateVersion(lastVersionVal);
// bootloader expects ACK or NAK
sendAck();
}
break;
}
}
else // bad checksum so clear
{
responseData.clear();
// bootloader expects ACK or NAK
if(bootloaderActive)
{
sendNak();
}
}
mode = MODE_WAIT_START;
break;
case MODE_CCDUMP_START: // Start of CCDUMP
lastCCDump.append(*it);
mode = MODE_CCDUMP_DATA;
break;
case MODE_CCDUMP_DATA: // CCDump continues
lastCCDump.append(*it);
if(*it == 0x0a)
{
emit updateCCDump(lastCCDump);
mode = MODE_WAIT_START;
}
break;
}
}
}
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