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Modem.cpp
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/*
* Copyright (C) 2011-2016 by Jonathan Naylor G4KLX
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "DStarDefines.h"
#include "DMRDefines.h"
#include "YSFDefines.h"
#include "Defines.h"
#include "Modem.h"
#include "Utils.h"
#include "Log.h"
#include <cmath>
#include <cstdio>
#include <cassert>
#include <cstdint>
#if defined(_WIN32) || defined(_WIN64)
#include <Windows.h>
#else
#include <unistd.h>
#endif
const unsigned char MMDVM_FRAME_START = 0xE0U;
const unsigned char MMDVM_GET_VERSION = 0x00U;
const unsigned char MMDVM_GET_STATUS = 0x01U;
const unsigned char MMDVM_SET_CONFIG = 0x02U;
const unsigned char MMDVM_SET_MODE = 0x03U;
const unsigned char MMDVM_SET_FREQ = 0x04U;
const unsigned char MMDVM_DSTAR_HEADER = 0x10U;
const unsigned char MMDVM_DSTAR_DATA = 0x11U;
const unsigned char MMDVM_DSTAR_LOST = 0x12U;
const unsigned char MMDVM_DSTAR_EOT = 0x13U;
const unsigned char MMDVM_DMR_DATA1 = 0x18U;
const unsigned char MMDVM_DMR_LOST1 = 0x19U;
const unsigned char MMDVM_DMR_DATA2 = 0x1AU;
const unsigned char MMDVM_DMR_LOST2 = 0x1BU;
const unsigned char MMDVM_DMR_SHORTLC = 0x1CU;
const unsigned char MMDVM_DMR_START = 0x1DU;
const unsigned char MMDVM_YSF_DATA = 0x20U;
const unsigned char MMDVM_YSF_LOST = 0x21U;
const unsigned char MMDVM_ACK = 0x70U;
const unsigned char MMDVM_NAK = 0x7FU;
const unsigned char MMDVM_DEBUG1 = 0xF1U;
const unsigned char MMDVM_DEBUG2 = 0xF2U;
const unsigned char MMDVM_DEBUG3 = 0xF3U;
const unsigned char MMDVM_DEBUG4 = 0xF4U;
const unsigned char MMDVM_DEBUG5 = 0xF5U;
const unsigned int MAX_RESPONSES = 30U;
const unsigned int BUFFER_LENGTH = 500U;
CModem::CModem(const std::string& port, bool rxInvert, bool txInvert, bool pttInvert, unsigned int txDelay, unsigned int rxLevel, unsigned int txLevel, unsigned int dmrDelay, int oscOffset, bool debug) :
m_port(port),
m_colorCode(0U),
m_rxInvert(rxInvert),
m_txInvert(txInvert),
m_pttInvert(pttInvert),
m_txDelay(txDelay),
m_dmrDelay(dmrDelay),
m_rxLevel(rxLevel),
m_txLevel(txLevel),
m_oscOffset(oscOffset),
m_debug(debug),
m_rxFrequency(0U),
m_txFrequency(0U),
m_dstarEnabled(false),
m_dmrEnabled(false),
m_ysfEnabled(false),
m_serial(port, SERIAL_115200, true),
m_buffer(NULL),
m_length(0U),
m_offset(0U),
m_rxDStarData(1000U, "Modem RX D-Star"),
m_txDStarData(1000U, "Modem TX D-Star"),
m_rxDMRData1(1000U, "Modem RX DMR1"),
m_rxDMRData2(1000U, "Modem RX DMR2"),
m_txDMRData1(1000U, "Modem TX DMR1"),
m_txDMRData2(1000U, "Modem TX DMR2"),
m_rxYSFData(1000U, "Modem RX YSF"),
m_txYSFData(1000U, "Modem TX YSF"),
m_statusTimer(1000U, 0U, 250U),
m_inactivityTimer(1000U, 2U),
m_playoutTimer(1000U, 0U, 10U),
m_dstarSpace(0U),
m_dmrSpace1(0U),
m_dmrSpace2(0U),
m_ysfSpace(0U),
m_tx(false),
m_lockout(false),
m_error(false)
{
assert(!port.empty());
m_buffer = new unsigned char[BUFFER_LENGTH];
}
CModem::~CModem()
{
delete[] m_buffer;
}
void CModem::setRFParams(unsigned int rxFrequency, unsigned int txFrequency)
{
m_rxFrequency = rxFrequency;
m_txFrequency = txFrequency;
}
void CModem::setModeParams(bool dstarEnabled, bool dmrEnabled, bool ysfEnabled)
{
m_dstarEnabled = dstarEnabled;
m_dmrEnabled = dmrEnabled;
m_ysfEnabled = ysfEnabled;
}
void CModem::setDMRParams(unsigned int colorCode)
{
assert(colorCode < 16U);
m_colorCode = colorCode;
}
bool CModem::open()
{
::LogMessage("Opening the MMDVM");
bool ret = m_serial.open();
if (!ret)
return false;
ret = readVersion();
if (!ret) {
m_serial.close();
return false;
}
ret = setFrequency();
if (!ret) {
m_serial.close();
return false;
}
ret = setConfig();
if (!ret) {
m_serial.close();
return false;
}
m_statusTimer.start();
m_error = false;
m_offset = 0U;
return true;
}
void CModem::clock(unsigned int ms)
{
// Poll the modem status every 250ms
m_statusTimer.clock(ms);
if (m_statusTimer.hasExpired()) {
readStatus();
m_statusTimer.start();
}
m_inactivityTimer.clock(ms);
if (m_inactivityTimer.hasExpired()) {
LogError("No reply from the modem for some time, resetting it");
m_error = true;
close();
#if defined(_WIN32) || defined(_WIN64)
::Sleep(2000UL); // 2s
#else
::sleep(2UL); // 2s
#endif
while (!open()) {
#if defined(_WIN32) || defined(_WIN64)
::Sleep(5000UL); // 5s
#else
::sleep(5UL); // 5s
#endif
}
}
RESP_TYPE_MMDVM type = getResponse();
if (type == RTM_TIMEOUT) {
// Nothing to do
} else if (type == RTM_ERROR) {
// Nothing to do
} else {
// type == RTM_OK
switch (m_buffer[2U]) {
case MMDVM_DSTAR_HEADER: {
if (m_debug)
CUtils::dump(1U, "RX D-Star Header", m_buffer, m_length);
unsigned char data = m_length - 2U;
m_rxDStarData.addData(&data, 1U);
data = TAG_HEADER;
m_rxDStarData.addData(&data, 1U);
m_rxDStarData.addData(m_buffer + 3U, m_length - 3U);
}
break;
case MMDVM_DSTAR_DATA: {
if (m_debug)
CUtils::dump(1U, "RX D-Star Data", m_buffer, m_length);
unsigned char data = m_length - 2U;
m_rxDStarData.addData(&data, 1U);
data = TAG_DATA;
m_rxDStarData.addData(&data, 1U);
m_rxDStarData.addData(m_buffer + 3U, m_length - 3U);
}
break;
case MMDVM_DSTAR_LOST: {
if (m_debug)
CUtils::dump(1U, "RX D-Star Lost", m_buffer, m_length);
unsigned char data = 1U;
m_rxDStarData.addData(&data, 1U);
data = TAG_LOST;
m_rxDStarData.addData(&data, 1U);
}
break;
case MMDVM_DSTAR_EOT: {
if (m_debug)
CUtils::dump(1U, "RX D-Star EOT", m_buffer, m_length);
unsigned char data = 1U;
m_rxDStarData.addData(&data, 1U);
data = TAG_EOT;
m_rxDStarData.addData(&data, 1U);
}
break;
case MMDVM_DMR_DATA1: {
if (m_debug)
CUtils::dump(1U, "RX DMR Data 1", m_buffer, m_length);
unsigned char data = m_length - 2U;
m_rxDMRData1.addData(&data, 1U);
if (m_buffer[3U] == (DMR_SYNC_DATA | DT_TERMINATOR_WITH_LC))
data = TAG_EOT;
else
data = TAG_DATA;
m_rxDMRData1.addData(&data, 1U);
m_rxDMRData1.addData(m_buffer + 3U, m_length - 3U);
}
break;
case MMDVM_DMR_DATA2: {
if (m_debug)
CUtils::dump(1U, "RX DMR Data 2", m_buffer, m_length);
unsigned char data = m_length - 2U;
m_rxDMRData2.addData(&data, 1U);
if (m_buffer[3U] == (DMR_SYNC_DATA | DT_TERMINATOR_WITH_LC))
data = TAG_EOT;
else
data = TAG_DATA;
m_rxDMRData2.addData(&data, 1U);
m_rxDMRData2.addData(m_buffer + 3U, m_length - 3U);
}
break;
case MMDVM_DMR_LOST1: {
if (m_debug)
CUtils::dump(1U, "RX DMR Lost 1", m_buffer, m_length);
unsigned char data = 1U;
m_rxDMRData1.addData(&data, 1U);
data = TAG_LOST;
m_rxDMRData1.addData(&data, 1U);
}
break;
case MMDVM_DMR_LOST2: {
if (m_debug)
CUtils::dump(1U, "RX DMR Lost 2", m_buffer, m_length);
unsigned char data = 1U;
m_rxDMRData2.addData(&data, 1U);
data = TAG_LOST;
m_rxDMRData2.addData(&data, 1U);
}
break;
case MMDVM_YSF_DATA: {
if (m_debug)
CUtils::dump(1U, "RX YSF Data", m_buffer, m_length);
unsigned char data = m_length - 2U;
m_rxYSFData.addData(&data, 1U);
data = TAG_DATA;
m_rxYSFData.addData(&data, 1U);
m_rxYSFData.addData(m_buffer + 3U, m_length - 3U);
}
break;
case MMDVM_YSF_LOST: {
if (m_debug)
CUtils::dump(1U, "RX YSF Lost", m_buffer, m_length);
unsigned char data = 1U;
m_rxYSFData.addData(&data, 1U);
data = TAG_LOST;
m_rxYSFData.addData(&data, 1U);
}
break;
case MMDVM_GET_STATUS: {
// if (m_debug)
// CUtils::dump(1U, "GET_STATUS", m_buffer, m_length);
m_tx = (m_buffer[5U] & 0x01U) == 0x01U;
bool adcOverflow = (m_buffer[5U] & 0x02U) == 0x02U;
if (adcOverflow)
LogError("MMDVM ADC levels have overflowed");
bool rxOverflow = (m_buffer[5U] & 0x04U) == 0x04U;
if (rxOverflow)
LogError("MMDVM RX buffer has overflowed");
bool txOverflow = (m_buffer[5U] & 0x08U) == 0x08U;
if (txOverflow)
LogError("MMDVM TX buffer has overflowed");
m_lockout = (m_buffer[5U] & 0x10U) == 0x10U;
m_dstarSpace = m_buffer[6U];
m_dmrSpace1 = m_buffer[7U];
m_dmrSpace2 = m_buffer[8U];
m_ysfSpace = m_buffer[9U];
m_inactivityTimer.start();
// LogMessage("status=%02X, tx=%d, space=%u,%u,%u,%u, lockout=%d", m_buffer[5U], int(m_tx), m_dstarSpace, m_dmrSpace1, m_dmrSpace2, m_ysfSpace, int(m_lockout));
}
break;
// These should not be received, but don't complain if we do
case MMDVM_GET_VERSION:
case MMDVM_ACK:
break;
case MMDVM_NAK:
LogWarning("Received a NAK from the MMDVM, command = 0x%02X, reason = %u", m_buffer[3U], m_buffer[4U]);
break;
default:
LogMessage("Unknown message, type: %02X", m_buffer[2U]);
CUtils::dump("Buffer dump", m_buffer, m_length);
break;
}
}
// Only feed data to the modem if the playout timer has expired
m_playoutTimer.clock(ms);
if (!m_playoutTimer.hasExpired())
return;
if (m_dstarSpace > 1U && !m_txDStarData.isEmpty()) {
unsigned char buffer[4U];
m_txDStarData.peek(buffer, 4U);
if ((buffer[3U] == MMDVM_DSTAR_HEADER && m_dstarSpace > 4U) ||
(buffer[3U] == MMDVM_DSTAR_DATA && m_dstarSpace > 1U) ||
(buffer[3U] == MMDVM_DSTAR_EOT && m_dstarSpace > 1U)) {
unsigned char len = 0U;
m_txDStarData.getData(&len, 1U);
m_txDStarData.getData(m_buffer, len);
if (m_debug) {
switch (buffer[3U]) {
case MMDVM_DSTAR_HEADER:
CUtils::dump(1U, "TX D-Star Header", m_buffer, len);
m_dstarSpace -= 4U;
break;
case MMDVM_DSTAR_DATA:
CUtils::dump(1U, "TX D-Star Data", m_buffer, len);
m_dstarSpace -= 1U;
break;
default:
CUtils::dump(1U, "TX D-Star EOT", m_buffer, len);
m_dstarSpace -= 1U;
break;
}
}
int ret = m_serial.write(m_buffer, len);
if (ret != int(len))
LogWarning("Error when writing D-Star data to the MMDVM");
m_playoutTimer.start();
}
}
if (m_dmrSpace1 > 1U && !m_txDMRData1.isEmpty()) {
unsigned char len = 0U;
m_txDMRData1.getData(&len, 1U);
m_txDMRData1.getData(m_buffer, len);
if (m_debug)
CUtils::dump(1U, "TX DMR Data 1", m_buffer, len);
int ret = m_serial.write(m_buffer, len);
if (ret != int(len))
LogWarning("Error when writing DMR data to the MMDVM");
m_playoutTimer.start();
m_dmrSpace1--;
}
if (m_dmrSpace2 > 1U && !m_txDMRData2.isEmpty()) {
unsigned char len = 0U;
m_txDMRData2.getData(&len, 1U);
m_txDMRData2.getData(m_buffer, len);
if (m_debug)
CUtils::dump(1U, "TX DMR Data 2", m_buffer, len);
int ret = m_serial.write(m_buffer, len);
if (ret != int(len))
LogWarning("Error when writing DMR data to the MMDVM");
m_playoutTimer.start();
m_dmrSpace2--;
}
if (m_ysfSpace > 1U && !m_txYSFData.isEmpty()) {
unsigned char len = 0U;
m_txYSFData.getData(&len, 1U);
m_txYSFData.getData(m_buffer, len);
if (m_debug)
CUtils::dump(1U, "TX YSF Data", m_buffer, len);
int ret = m_serial.write(m_buffer, len);
if (ret != int(len))
LogWarning("Error when writing YSF data to the MMDVM");
m_playoutTimer.start();
m_ysfSpace--;
}
}
void CModem::close()
{
::LogMessage("Closing the MMDVM");
m_serial.close();
}
unsigned int CModem::readDStarData(unsigned char* data)
{
assert(data != NULL);
if (m_rxDStarData.isEmpty())
return 0U;
unsigned char len = 0U;
m_rxDStarData.getData(&len, 1U);
m_rxDStarData.getData(data, len);
return len;
}
unsigned int CModem::readDMRData1(unsigned char* data)
{
assert(data != NULL);
if (m_rxDMRData1.isEmpty())
return 0U;
unsigned char len = 0U;
m_rxDMRData1.getData(&len, 1U);
m_rxDMRData1.getData(data, len);
return len;
}
unsigned int CModem::readDMRData2(unsigned char* data)
{
assert(data != NULL);
if (m_rxDMRData2.isEmpty())
return 0U;
unsigned char len = 0U;
m_rxDMRData2.getData(&len, 1U);
m_rxDMRData2.getData(data, len);
return len;
}
unsigned int CModem::readYSFData(unsigned char* data)
{
assert(data != NULL);
if (m_rxYSFData.isEmpty())
return 0U;
unsigned char len = 0U;
m_rxYSFData.getData(&len, 1U);
m_rxYSFData.getData(data, len);
return len;
}
bool CModem::hasDStarSpace() const
{
unsigned int space = m_txDStarData.freeSpace() / (DSTAR_FRAME_LENGTH_BYTES + 4U);
return space > 1U;
}
bool CModem::writeDStarData(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
unsigned char buffer[50U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = length + 2U;
switch (data[0U]) {
case TAG_HEADER: buffer[2U] = MMDVM_DSTAR_HEADER; break;
case TAG_DATA: buffer[2U] = MMDVM_DSTAR_DATA; break;
case TAG_EOT: buffer[2U] = MMDVM_DSTAR_EOT; break;
default: return false;
}
::memcpy(buffer + 3U, data + 1U, length - 1U);
unsigned char len = length + 2U;
m_txDStarData.addData(&len, 1U);
m_txDStarData.addData(buffer, len);
return true;
}
bool CModem::hasDMRSpace1() const
{
unsigned int space = m_txDMRData1.freeSpace() / (DMR_FRAME_LENGTH_BYTES + 4U);
return space > 1U;
}
bool CModem::hasDMRSpace2() const
{
unsigned int space = m_txDMRData2.freeSpace() / (DMR_FRAME_LENGTH_BYTES + 4U);
return space > 1U;
}
bool CModem::writeDMRData1(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
if (data[0U] != TAG_DATA && data[0U] != TAG_EOT)
return false;
unsigned char buffer[40U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = length + 2U;
buffer[2U] = MMDVM_DMR_DATA1;
::memcpy(buffer + 3U, data + 1U, length - 1U);
unsigned char len = length + 2U;
m_txDMRData1.addData(&len, 1U);
m_txDMRData1.addData(buffer, len);
return true;
}
bool CModem::writeDMRData2(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
if (data[0U] != TAG_DATA && data[0U] != TAG_EOT)
return false;
unsigned char buffer[40U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = length + 2U;
buffer[2U] = MMDVM_DMR_DATA2;
::memcpy(buffer + 3U, data + 1U, length - 1U);
unsigned char len = length + 2U;
m_txDMRData2.addData(&len, 1U);
m_txDMRData2.addData(buffer, len);
return true;
}
bool CModem::hasYSFSpace() const
{
unsigned int space = m_txYSFData.freeSpace() / (YSF_FRAME_LENGTH_BYTES + 4U);
return space > 1U;
}
bool CModem::hasTX() const
{
return m_tx;
}
bool CModem::hasLockout() const
{
return m_lockout;
}
bool CModem::hasError() const
{
return m_error;
}
bool CModem::writeYSFData(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
if (data[0U] != TAG_DATA && data[0U] != TAG_EOT)
return false;
unsigned char buffer[130U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = length + 2U;
buffer[2U] = MMDVM_YSF_DATA;
::memcpy(buffer + 3U, data + 1U, length - 1U);
unsigned char len = length + 2U;
m_txYSFData.addData(&len, 1U);
m_txYSFData.addData(buffer, len);
return true;
}
bool CModem::readVersion()
{
#if defined(_WIN32) || defined(_WIN64)
::Sleep(2000UL); // 2s
#else
::sleep(2); // 2s
#endif
for (unsigned int i = 0U; i < 6U; i++) {
unsigned char buffer[3U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = 3U;
buffer[2U] = MMDVM_GET_VERSION;
// CUtils::dump(1U, "Written", buffer, 3U);
int ret = m_serial.write(buffer, 3U);
if (ret != 3)
return false;
for (unsigned int count = 0U; count < MAX_RESPONSES; count++) {
#if defined(_WIN32) || defined(_WIN64)
::Sleep(10UL);
#else
::usleep(10000UL);
#endif
RESP_TYPE_MMDVM resp = getResponse();
if (resp == RTM_OK && m_buffer[2U] == MMDVM_GET_VERSION) {
LogInfo("MMDVM protocol version: %u, description: %.*s", m_buffer[3U], m_length - 4U, m_buffer + 4U);
return true;
}
}
#if defined(_WIN32) || defined(_WIN64)
::Sleep(1000UL); // 1s
#else
::sleep(1UL); // 1s
#endif
}
LogError("Unable to read the firmware version after six attempts");
return false;
}
bool CModem::readStatus()
{
unsigned char buffer[3U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = 3U;
buffer[2U] = MMDVM_GET_STATUS;
// CUtils::dump(1U, "Written", buffer, 3U);
return m_serial.write(buffer, 3U) == 3;
}
bool CModem::setConfig()
{
unsigned char buffer[12U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = 12U;
buffer[2U] = MMDVM_SET_CONFIG;
buffer[3U] = 0x00U;
if (m_rxInvert)
buffer[3U] |= 0x01U;
if (m_txInvert)
buffer[3U] |= 0x02U;
if (m_pttInvert)
buffer[3U] |= 0x04U;
buffer[4U] = 0x00U;
if (m_dstarEnabled)
buffer[4U] |= 0x01U;
if (m_dmrEnabled)
buffer[4U] |= 0x02U;
if (m_ysfEnabled)
buffer[4U] |= 0x04U;
buffer[5U] = m_txDelay / 10U; // In 10ms units
buffer[6U] = MODE_IDLE;
buffer[7U] = (m_rxLevel * 255U) / 100U;
buffer[8U] = (m_txLevel * 255U) / 100U;
buffer[9U] = m_colorCode;
buffer[10U] = m_dmrDelay;
buffer[11U] = (unsigned char)(m_oscOffset + 128);
// CUtils::dump(1U, "Written", buffer, 12U);
int ret = m_serial.write(buffer, 12U);
if (ret != 12)
return false;
unsigned int count = 0U;
RESP_TYPE_MMDVM resp;
do {
#if defined(_WIN32) || defined(_WIN64)
::Sleep(10UL);
#else
::usleep(10000UL);
#endif
resp = getResponse();
if (resp == RTM_OK && m_buffer[2U] != MMDVM_ACK && m_buffer[2U] != MMDVM_NAK) {
count++;
if (count >= MAX_RESPONSES) {
LogError("The MMDVM is not responding to the SET_CONFIG command");
return false;
}
}
} while (resp == RTM_OK && m_buffer[2U] != MMDVM_ACK && m_buffer[2U] != MMDVM_NAK);
// CUtils::dump(1U, "Response", m_buffer, m_length);
if (resp == RTM_OK && m_buffer[2U] == MMDVM_NAK) {
LogError("Received a NAK to the SET_CONFIG command from the modem");
return false;
}
m_playoutTimer.start();
return true;
}
bool CModem::setFrequency()
{
unsigned char buffer[15U];
buffer[0U] = MMDVM_FRAME_START;
buffer[1U] = 12U;
buffer[2U] = MMDVM_SET_FREQ;
buffer[3U] = 0x00U;
buffer[4U] = (m_rxFrequency >> 0) & 0xFFU;
buffer[5U] = (m_rxFrequency >> 8) & 0xFFU;
buffer[6U] = (m_rxFrequency >> 16) & 0xFFU;
buffer[7U] = (m_rxFrequency >> 24) & 0xFFU;
buffer[8U] = (m_txFrequency >> 0) & 0xFFU;
buffer[9U] = (m_txFrequency >> 8) & 0xFFU;
buffer[10U] = (m_txFrequency >> 16) & 0xFFU;
buffer[11U] = (m_txFrequency >> 24) & 0xFFU;
// CUtils::dump(1U, "Written", buffer, 12U);
int ret = m_serial.write(buffer, 12U);
if (ret != 12)
return false;
unsigned int count = 0U;
RESP_TYPE_MMDVM resp;
do {
#if defined(_WIN32) || defined(_WIN64)
::Sleep(10UL);
#else
::usleep(10000UL);
#endif
resp = getResponse();
if (resp == RTM_OK && m_buffer[2U] != MMDVM_ACK && m_buffer[2U] != MMDVM_NAK) {
count++;
if (count >= MAX_RESPONSES) {
LogError("The MMDVM is not responding to the SET_FREQ command");
return false;
}
}
} while (resp == RTM_OK && m_buffer[2U] != MMDVM_ACK && m_buffer[2U] != MMDVM_NAK);
// CUtils::dump(1U, "Response", m_buffer, m_length);
if (resp == RTM_OK && m_buffer[2U] == MMDVM_NAK) {
LogError("Received a NAK to the SET_FREQ command from the modem");
return false;
}
return true;
}
RESP_TYPE_MMDVM CModem::getResponse()
{
if (m_offset == 0U) {
// Get the start of the frame or nothing at all
int ret = m_serial.read(m_buffer + 0U, 1U);
if (ret < 0) {
LogError("Error when reading from the modem");
return RTM_ERROR;
}
if (ret == 0)
return RTM_TIMEOUT;
if (m_buffer[0U] != MMDVM_FRAME_START)
return RTM_TIMEOUT;
m_offset = 1U;
}
if (m_offset == 1U) {
// Get the length of the frame
int ret = m_serial.read(m_buffer + 1U, 1U);
if (ret < 0) {
LogError("Error when reading from the modem");
m_offset = 0U;
return RTM_ERROR;
}
if (ret == 0)
return RTM_TIMEOUT;
if (m_buffer[1U] >= 150U) {
LogError("Invalid length received from the modem - %u", m_buffer[1U]);
m_offset = 0U;
return RTM_ERROR;
}
m_length = m_buffer[1U];
m_offset = 2U;
}
if (m_offset == 2U) {
// Get the frame type
int ret = m_serial.read(m_buffer + 2U, 1U);
if (ret < 0) {
LogError("Error when reading from the modem");
m_offset = 0U;
return RTM_ERROR;
}
if (ret == 0)
return RTM_TIMEOUT;
switch (m_buffer[2U]) {
case MMDVM_DSTAR_HEADER:
case MMDVM_DSTAR_DATA:
case MMDVM_DSTAR_LOST:
case MMDVM_DSTAR_EOT:
case MMDVM_DMR_DATA1:
case MMDVM_DMR_DATA2:
case MMDVM_DMR_LOST1:
case MMDVM_DMR_LOST2:
case MMDVM_YSF_DATA:
case MMDVM_YSF_LOST:
case MMDVM_GET_STATUS:
case MMDVM_GET_VERSION:
case MMDVM_ACK:
case MMDVM_NAK:
case MMDVM_DEBUG1:
case MMDVM_DEBUG2:
case MMDVM_DEBUG3:
case MMDVM_DEBUG4:
case MMDVM_DEBUG5:
break;
default:
LogError("Unknown message, type: %02X", m_buffer[2U]);
m_offset = 0U;
return RTM_ERROR;
}
m_offset = 3U;
}
if (m_offset >= 3U) {
while (m_offset < m_length) {
int ret = m_serial.read(m_buffer + m_offset, m_length - m_offset);
if (ret < 0) {
LogError("Error when reading from the modem");
m_offset = 0U;
return RTM_ERROR;
}
if (ret == 0)
return RTM_TIMEOUT;
if (ret > 0)
m_offset += ret;
}
}
m_offset = 0U;
switch (m_buffer[2U]) {
case MMDVM_DEBUG1:
case MMDVM_DEBUG2:
case MMDVM_DEBUG3:
case MMDVM_DEBUG4:
case MMDVM_DEBUG5:
printDebug();
return RTM_TIMEOUT;
default:
// CUtils::dump(1U, "Received", m_buffer, m_length);
return RTM_OK;
}
}