DSMT_TYPE CModem::read()
{
m_readLength = 0U;
if (m_rxData.isEmpty())
return DSMTT_NONE;
wxMutexLocker locker(m_mutex);
unsigned char hdr[2U];
m_rxData.getData(hdr, 2U);
m_readType = DSMT_TYPE(hdr[0U]);
m_readLength = hdr[1U];
m_rxData.getData(m_readBuffer, m_readLength);
return m_readType;
}
void* CGMSKController::Entry()
{
wxLogMessage(wxT("Starting GMSK Modem Controller thread"));
CTimer hdrTimer(100U, 0U, 100U);
hdrTimer.start();
CTimer dataTimer(100U, 0U, 100U);
bool rx = false;
DSMT_TYPE writeType = DSMTT_HEADER;
unsigned char writeLength = 0U;
unsigned char* writeBuffer = new unsigned char[BUFFER_LENGTH];
unsigned char readLength = 0U;
unsigned char* readBuffer = new unsigned char[DV_FRAME_LENGTH_BYTES];
while (!m_stopped) {
// Only receive when not transmitting or when in duplex mode
if (!m_tx || m_duplex) {
if (rx) {
unsigned char buffer[GMSK_MODEM_DATA_LENGTH];
bool end;
int ret = m_modem->readData(buffer, GMSK_MODEM_DATA_LENGTH, end);
if (ret >= 0) {
// CUtils::dump(wxT("Read Data"), buffer, ret);
if (end) {
wxMutexLocker locker(m_mutex);
unsigned char data[2U];
data[0U] = DSMTT_EOT;
data[1U] = 0U;
m_rxData.addData(data, 2U);
hdrTimer.start();
readLength = 0U;
rx = false;
} else {
for (int i = 0; i < ret; i++) {
readBuffer[readLength] = buffer[i];
readLength++;
if (readLength >= DV_FRAME_LENGTH_BYTES) {
wxMutexLocker locker(m_mutex);
unsigned char data[2U];
data[0U] = DSMTT_DATA;
data[1U] = DV_FRAME_LENGTH_BYTES;
m_rxData.addData(data, 2U);
m_rxData.addData(readBuffer, DV_FRAME_LENGTH_BYTES);
readLength = 0U;
}
}
}
}
} else {
// Check for a header every 100ms or so
if (hdrTimer.isRunning() && hdrTimer.hasExpired()) {
unsigned char buffer[90U];
bool ret = m_modem->readHeader(buffer, 90U);
if (ret) {
// CUtils::dump(wxT("Read Header"), buffer, RADIO_HEADER_LENGTH_BYTES);
wxMutexLocker locker(m_mutex);
unsigned char data[2U];
data[0U] = DSMTT_HEADER;
data[1U] = RADIO_HEADER_LENGTH_BYTES - 2U;
m_rxData.addData(data, 2U);
m_rxData.addData(buffer, RADIO_HEADER_LENGTH_BYTES - 2U);
hdrTimer.stop();
readLength = 0U;
rx = true;
} else {
hdrTimer.reset();
}
}
}
}
// Only transmit when not receiving or when in duplex mode
if (!rx || m_duplex) {
if (writeLength == 0U && m_txData.hasData()) {
wxMutexLocker locker(m_mutex);
unsigned char type;
m_txData.getData(&type, 1U);
writeType = DSMT_TYPE(type);
m_txData.getData(&writeLength, 1U);
m_txData.getData(writeBuffer, writeLength);
}
if (writeLength > 0U) {
if (writeType == DSMTT_HEADER) {
TRISTATE tx = m_modem->getPTT();
// Check that the modem isn't still transmitting before sending the new header
if (tx == STATE_FALSE) {
// CUtils::dump(wxT("Write Header"), writeBuffer, writeLength);
m_modem->writeHeader(writeBuffer, writeLength);
m_modem->setPTT(true);
dataTimer.start();
writeLength = 0U;
m_tx = true;
}
} else {
// Don't start sending data until the header has been gone for 100ms or so
if (!dataTimer.isRunning() || dataTimer.hasExpired()) {
dataTimer.stop();
TRISTATE ret = m_modem->hasSpace();
// Check that there is space in the modem buffer
if (ret == STATE_TRUE) {
// CUtils::dump(wxT("Write Data"), writeBuffer, writeLength);
int ret = m_modem->writeData(writeBuffer, writeLength);
if (ret > 0) {
writeLength -= ret;
if (writeType == DSMTT_EOT) {
m_modem->setPTT(false);
m_tx = false;
}
}
}
}
}
}
}
Sleep(10UL);
dataTimer.clock();
hdrTimer.clock();
}
wxLogMessage(wxT("Stopping GMSK Modem Controller thread"));
m_modem->close();
delete[] writeBuffer;
delete[] readBuffer;
return NULL;
}
