QByteArray StandardSerialPortBackend::readCommandFrame()
{
// qDebug() << "!d" << tr("DBG -- Serial Port readCommandFrame...");
QByteArray data;
DWORD mask;
switch (mMethod) {
case 0:
mask = EV_RING;
break;
case 1:
mask = EV_DSR;
break;
case 2:
mask = EV_CTS;
break;
case 3:
mask = EV_RXCHAR;
}
if (!SetCommMask(mHandle, mask)) {
qCritical() << "!e" << tr("Cannot set serial port event mask: %1").arg(lastErrorMessage());
return data;
}
int retries = 0, totalRetries = 0;
do {
data.clear();
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
ov.hEvent = CreateEvent(0, true, false, 0);
HANDLE events[2];
events[0] = ov.hEvent;
events[1] = mCancelHandle;
if (!WaitCommEvent(mHandle, &mask, &ov)) {
if (GetLastError() == ERROR_IO_PENDING) {
DWORD x = WaitForMultipleObjects(2, events, false, INFINITE);
CloseHandle(ov.hEvent);
if (x == WAIT_OBJECT_0 + 1) {
data.clear();
return data;
}
if (x == WAIT_FAILED) {
qCritical() << "!e" << tr("Cannot wait for serial port event: %1").arg(lastErrorMessage());
data.clear();
return data;
}
} else {
CloseHandle(ov.hEvent);
qCritical() << "!e" << tr("Cannot wait for serial port event: %1").arg(lastErrorMessage());
return data;
}
}
if (!PurgeComm(mHandle, PURGE_RXCLEAR)) {
qCritical() << "!e" << tr("Cannot clear serial port read buffer: %1").arg(lastErrorMessage());
return data;
}
// qDebug() << "!d" << tr("DBG -- Serial Port, just about to readDataFrame...");
data = readDataFrame(4, false);
if (!data.isEmpty()) {
// qDebug() << "!d" << tr("DBG -- Serial Port, data not empty: [%1]").arg(data.data());
if(mask != EV_RXCHAR) { //
do {
GetCommModemStatus(mHandle, &mask);
} while (mask && !mCanceled);
}
break;
} else {
retries++;
totalRetries++;
if (retries == 2) {
retries = 0;
if (mHighSpeed) {
setNormalSpeed();
} else {
setHighSpeed();
}
}
}
// } while (totalRetries < 100);
} while (1);
return data;
}
QByteArray StandardSerialPortBackend::readCommandFrame()
{
// qDebug() << "!d" << tr("DBG -- Serial Port readCommandFrame...");
QByteArray data;
if(mMethod==HANDSHAKE_SOFTWARE)
{
if (!PurgeComm(mHandle, PURGE_RXCLEAR)) {
qCritical() << "!e" << tr("Cannot clear serial port read buffer: %1").arg(lastErrorMessage());
return data;
}
const int size = 4;
quint8 expected = 0;
quint8 got = 1;
do
{
DWORD result;
char c;
if(ReadFile(mHandle, &c, 1, &result, NULL) && result == 1)
{
data.append(c);
if(data.size()==size+2)
{
data.remove(0,1);
}
if(data.size()==size+1)
{
for(int i=0 ; i<mSioDevices.size() ; i++)
{
if(data.at(0)==mSioDevices[i])
{
expected = (quint8)data.at(size);
got = sioChecksum(data, size);
break;
}
}
}
}
} while(got!=expected && !mCanceled);
if(got==expected)
{
data.resize(size);
// After sending the last byte of the command frame
// ATARI does not drop the command line immediately.
// Within this small time window ATARI is not able to process the ACK byte.
// For the "software handshake" approach, we need to wait here a little bit.
QThread::usleep(500);
}
else
{
data.clear();
}
}
else
{
DWORD MASK;
DWORD MODEM_STAT;
DWORD tmp;
switch (mMethod) {
case HANDSHAKE_RI:
MASK = EV_RING;
MODEM_STAT = MS_RING_ON;
break;
case HANDSHAKE_DSR:
MASK = EV_DSR;
MODEM_STAT = MS_DSR_ON;
break;
case HANDSHAKE_CTS:
MASK = EV_CTS;
MODEM_STAT = MS_CTS_ON;
break;
case HANDSHAKE_NO_HANDSHAKE:
default:
MASK = EV_RXCHAR;
MODEM_STAT = 0;
break;
}
if (!SetCommMask(mHandle, MASK)) {
qCritical() << "!e" << tr("Cannot set serial port event mask: %1").arg(lastErrorMessage());
return data;
}
int retries = 0, totalRetries = 0;
do {
data.clear();
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
ov.hEvent = CreateEvent(0, true, false, 0);
HANDLE events[2];
events[0] = ov.hEvent;
events[1] = mCancelHandle;
if (!WaitCommEvent(mHandle, &tmp, &ov)) {
if (GetLastError() == ERROR_IO_PENDING) {
DWORD x = WaitForMultipleObjects(2, events, false, INFINITE);
CloseHandle(ov.hEvent);
if (x == WAIT_OBJECT_0 + 1) {
data.clear();
return data;
}
if (x == WAIT_FAILED) {
qCritical() << "!e" << tr("Cannot wait for serial port event: %1").arg(lastErrorMessage());
data.clear();
return data;
}
} else {
CloseHandle(ov.hEvent);
qCritical() << "!e" << tr("Cannot wait for serial port event: %1").arg(lastErrorMessage());
return data;
}
}
// for hardware handshake methods check if the command line status is ON
if( (MODEM_STAT != 0) && (!GetCommModemStatus(mHandle, &tmp) || !(tmp & MODEM_STAT)) )continue;
if(MASK != EV_RXCHAR)
{
if (!PurgeComm(mHandle, PURGE_RXCLEAR)) {
qCritical() << "!e" << tr("Cannot clear serial port read buffer: %1").arg(lastErrorMessage());
return data;
}
}
// qDebug() << "!d" << tr("DBG -- Serial Port, just about to readDataFrame...");
data = readDataFrame(4, false);
if (!data.isEmpty()) {
// qDebug() << "!d" << tr("DBG -- Serial Port, data not empty: [%1]").arg(data.data());
if(MASK != EV_RXCHAR) { //
do {
GetCommModemStatus(mHandle, &tmp);
} while ((tmp & MODEM_STAT) && !mCanceled);
}
else
{
// After sending the last byte of the command frame
// ATARI does not drop the command line immediately.
// Within this small time window ATARI is not able to process the ACK byte.
// For the "software handshake" approach, we need to wait here a little bit.
QThread::usleep(500);
}
break;
} else {
retries++;
totalRetries++;
if (retries == 2) {
retries = 0;
if (mHighSpeed) {
setNormalSpeed();
} else {
setHighSpeed();
}
}
}
// } while (totalRetries < 100);
} while (1);
}
return data;
}
