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MMDVM
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MMDVM/FM.cpp

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/*
* Copyright (C) 2020 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 "Config.h"
#include "Globals.h"
#include "FM.h"
CFM::CFM() :
m_callsign(),
m_rfAck(),
m_ctcssRX(),
m_ctcssTX(),
m_timeoutTone(),
m_state(FS_LISTENING),
m_callsignAtStart(false),
m_callsignAtEnd(false),
m_callsignAtLatch(false),
m_callsignTimer(),
m_timeoutTimer(),
m_holdoffTimer(),
m_kerchunkTimer(),
m_ackMinTimer(),
m_ackDelayTimer(),
m_hangTimer(),
m_filterStage1( 724, 1448, 724, 32768, -37895, 21352),//3rd order Cheby Filter 300 to 2700Hz, 0.2dB passband ripple, sampling rate 24kHz
m_filterStage2(32768, 0,-32768, 32768, -50339, 19052),
m_filterStage3(32768, -65536, 32768, 32768, -64075, 31460),
m_blanking(),
m_useCOS(true),
m_cosInvert(false),
m_rfAudioBoost(1U),
m_downsampler(128U),//Size might need adjustement
m_rxLevel(1),
m_outputRB(2400U) // 100ms of audio
{
}
void CFM::samples(bool cos, const q15_t* samples, uint8_t length)
{
if (m_useCOS) {
if (m_cosInvert)
cos = !cos;
} else {
cos = true;
}
clock(length);
uint8_t i = 0U;
for (; i < length; i++) {
// ARMv7-M has hardware integer division
q15_t currentSample = q15_t((q31_t(samples[i]) << 8) / m_rxLevel);
uint8_t ctcssState = m_ctcssRX.process(currentSample);
if (CTCSS_NOT_READY(ctcssState) && m_modemState != STATE_FM) {
//Not enough samples to determine if you have CTCSS, just carry on
continue;
} else if (CTCSS_READY(ctcssState) && m_modemState != STATE_FM) {
//we had enough samples for CTCSS and we are in some other mode than FM
bool validCTCSS = CTCSS_VALID(ctcssState);
stateMachine(validCTCSS && cos);
if (m_modemState != STATE_FM)
continue;
} else if (CTCSS_READY(ctcssState) && m_modemState == STATE_FM) {
//We had enough samples for CTCSS and we are in FM mode, trigger the state machine
bool validCTCSS = CTCSS_VALID(ctcssState);
stateMachine(validCTCSS && cos);
if (m_modemState != STATE_FM)
break;
} else if (CTCSS_NOT_READY(ctcssState) && m_modemState == STATE_FM && i == length - 1) {
//Not enough samples for CTCSS but we already are in FM, trigger the state machine
//but do not trigger the state machine on every single sample, save CPU!
bool validCTCSS = CTCSS_VALID(ctcssState);
stateMachine(validCTCSS && cos);
}
// Only let audio through when relaying audio
if (m_state == FS_RELAYING || m_state == FS_KERCHUNK) {
// m_downsampler.addSample(currentSample);
currentSample = m_blanking.process(currentSample);
currentSample *= m_rfAudioBoost;
} else {
currentSample = 0;
}
if (!m_callsign.isRunning())
currentSample += m_rfAck.getHighAudio();
if (!m_rfAck.isRunning()) {
if (m_state == FS_LISTENING)
currentSample += m_callsign.getHighAudio();
else
currentSample += m_callsign.getLowAudio();
}
if (!m_callsign.isRunning() && !m_rfAck.isRunning())
currentSample += m_timeoutTone.getAudio();
currentSample = m_filterStage3.filter(m_filterStage2.filter(m_filterStage1.filter(currentSample)));
currentSample += m_ctcssTX.getAudio();
if (m_modemState == STATE_FM)
m_outputRB.put(currentSample);
}
}
void CFM::process()
{
if (m_modemState != STATE_FM)
return;
uint16_t length = m_outputRB.getData();
if (length == 0U)
return;
uint16_t space = io.getSpace();
if (space < 3U)
return;
space -= 2U;
if (space < length)
length = space;
for (uint16_t i = 0U; i < length; i++) {
q15_t sample;
m_outputRB.get(sample);
io.write(STATE_FM, &sample, 1U);
}
}
void CFM::reset()
{
m_state = FS_LISTENING;
m_callsignTimer.stop();
m_timeoutTimer.stop();
m_kerchunkTimer.stop();
m_ackMinTimer.stop();
m_ackDelayTimer.stop();
m_hangTimer.stop();
m_ctcssRX.reset();
m_rfAck.stop();
m_callsign.stop();
m_timeoutTone.stop();
m_outputRB.reset();
}
uint8_t CFM::setCallsign(const char* callsign, uint8_t speed, uint16_t frequency, uint8_t time, uint8_t holdoff, uint8_t highLevel, uint8_t lowLevel, bool callsignAtStart, bool callsignAtEnd, bool callsignAtLatch)
{
m_callsignAtStart = callsignAtStart;
m_callsignAtEnd = callsignAtEnd;
m_callsignAtLatch = callsignAtLatch;
uint16_t holdoffTime = holdoff * 60U;
uint16_t callsignTime = time * 60U;
m_holdoffTimer.setTimeout(holdoffTime, 0U);
m_callsignTimer.setTimeout(callsignTime, 0U);
if (holdoffTime > 0U)
m_holdoffTimer.start();
return m_callsign.setParams(callsign, speed, frequency, highLevel, lowLevel);
}
uint8_t CFM::setAck(const char* rfAck, uint8_t speed, uint16_t frequency, uint8_t minTime, uint16_t delay, uint8_t level)
{
m_ackDelayTimer.setTimeout(0U, delay);
if (minTime > 0U)
m_ackMinTimer.setTimeout(minTime, delay);
return m_rfAck.setParams(rfAck, speed, frequency, level, level);
}
uint8_t CFM::setMisc(uint16_t timeout, uint8_t timeoutLevel, uint8_t ctcssFrequency, uint8_t ctcssThreshold, uint8_t ctcssLevel, uint8_t kerchunkTime, uint8_t hangTime, bool useCOS, bool cosInvert, uint8_t rfAudioBoost, uint8_t maxDev, uint8_t rxLevel)
{
m_useCOS = useCOS;
m_cosInvert = cosInvert;
m_rfAudioBoost = q15_t(rfAudioBoost);
m_timeoutTimer.setTimeout(timeout, 0U);
m_kerchunkTimer.setTimeout(kerchunkTime, 0U);
m_hangTimer.setTimeout(hangTime, 0U);
m_timeoutTone.setParams(timeoutLevel);
m_blanking.setParams(maxDev, timeoutLevel);
m_rxLevel = rxLevel; //q15_t(255)/q15_t(rxLevel >> 1);
uint8_t ret = m_ctcssRX.setParams(ctcssFrequency, ctcssThreshold);
if (ret != 0U)
return ret;
return m_ctcssTX.setParams(ctcssFrequency, ctcssLevel);
}
void CFM::stateMachine(bool validSignal)
{
switch (m_state) {
case FS_LISTENING:
listeningState(validSignal);
break;
case FS_KERCHUNK:
kerchunkState(validSignal);
break;
case FS_RELAYING:
relayingState(validSignal);
break;
case FS_RELAYING_WAIT:
relayingWaitState(validSignal);
break;
case FS_TIMEOUT:
timeoutState(validSignal);
break;
case FS_TIMEOUT_WAIT:
timeoutWaitState(validSignal);
break;
case FS_HANG:
hangState(validSignal);
break;
default:
break;
}
if (m_state == FS_LISTENING && m_modemState == STATE_FM) {
if (!m_callsign.isRunning() && !m_rfAck.isRunning()) {
DEBUG1("Change to STATE_IDLE");
m_modemState = STATE_IDLE;
m_callsignTimer.stop();
m_timeoutTimer.stop();
m_kerchunkTimer.stop();
m_ackMinTimer.stop();
m_ackDelayTimer.stop();
m_hangTimer.stop();
}
}
}
void CFM::clock(uint8_t length)
{
m_callsignTimer.clock(length);
m_timeoutTimer.clock(length);
m_holdoffTimer.clock(length);
m_kerchunkTimer.clock(length);
m_ackMinTimer.clock(length);
m_ackDelayTimer.clock(length);
m_hangTimer.clock(length);
}
void CFM::listeningState(bool validSignal)
{
if (validSignal) {
if (m_kerchunkTimer.getTimeout() > 0U) {
DEBUG1("State to KERCHUNK");
m_state = FS_KERCHUNK;
m_kerchunkTimer.start();
if (m_callsignAtStart && !m_callsignAtLatch)
sendCallsign();
} else {
DEBUG1("State to RELAYING");
m_state = FS_RELAYING;
if (m_callsignAtStart)
sendCallsign();
}
insertSilence(50U);
beginRelaying();
m_callsignTimer.start();
DEBUG1("Change to STATE_FM");
m_modemState = STATE_FM;
}
}
void CFM::kerchunkState(bool validSignal)
{
if (validSignal) {
if (m_kerchunkTimer.hasExpired()) {
DEBUG1("State to RELAYING");
m_state = FS_RELAYING;
m_kerchunkTimer.stop();
if (m_callsignAtStart && m_callsignAtLatch) {
sendCallsign();
m_callsignTimer.start();
}
}
} else {
DEBUG1("State to LISTENING");
m_state = FS_LISTENING;
m_kerchunkTimer.stop();
m_timeoutTimer.stop();
m_ackMinTimer.stop();
m_callsignTimer.stop();
}
}
void CFM::relayingState(bool validSignal)
{
if (validSignal) {
if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired()) {
DEBUG1("State to TIMEOUT");
m_state = FS_TIMEOUT;
m_ackMinTimer.stop();
m_timeoutTimer.stop();
m_timeoutTone.start();
}
} else {
DEBUG1("State to RELAYING_WAIT");
m_state = FS_RELAYING_WAIT;
m_ackDelayTimer.start();
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::relayingWaitState(bool validSignal)
{
if (validSignal) {
DEBUG1("State to RELAYING");
m_state = FS_RELAYING;
m_ackDelayTimer.stop();
} else {
if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
DEBUG1("State to HANG");
m_state = FS_HANG;
if (m_ackMinTimer.isRunning()) {
if (m_ackMinTimer.hasExpired()) {
DEBUG1("Send ack");
m_rfAck.start();
m_ackMinTimer.stop();
}
} else {
DEBUG1("Send ack");
m_rfAck.start();
m_ackMinTimer.stop();
}
m_ackDelayTimer.stop();
m_timeoutTimer.stop();
m_hangTimer.start();
}
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::hangState(bool validSignal)
{
if (validSignal) {
DEBUG1("State to RELAYING");
m_state = FS_RELAYING;
DEBUG1("Stop ack");
m_rfAck.stop();
beginRelaying();
} else {
if (m_hangTimer.isRunning() && m_hangTimer.hasExpired()) {
DEBUG1("State to LISTENING");
m_state = FS_LISTENING;
m_hangTimer.stop();
if (m_callsignAtEnd)
sendCallsign();
m_callsignTimer.stop();
}
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::timeoutState(bool validSignal)
{
if (!validSignal) {
DEBUG1("State to TIMEOUT_WAIT");
m_state = FS_TIMEOUT_WAIT;
m_ackDelayTimer.start();
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::timeoutWaitState(bool validSignal)
{
if (validSignal) {
DEBUG1("State to TIMEOUT");
m_state = FS_TIMEOUT;
m_ackDelayTimer.stop();
} else {
if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
DEBUG1("State to HANG");
m_state = FS_HANG;
m_timeoutTone.stop();
DEBUG1("Send ack");
m_rfAck.start();
m_ackDelayTimer.stop();
m_ackMinTimer.stop();
m_timeoutTimer.stop();
m_hangTimer.start();
}
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::sendCallsign()
{
if (m_holdoffTimer.isRunning()) {
if (m_holdoffTimer.hasExpired()) {
DEBUG1("Send callsign");
m_callsign.start();
m_holdoffTimer.start();
}
} else {
DEBUG1("Send callsign");
m_callsign.start();
}
}
void CFM::beginRelaying()
{
m_timeoutTimer.start();
m_ackMinTimer.start();
}
void CFM::insertSilence(uint16_t ms)
{
uint32_t nSamples = ms * 24U;
for (uint32_t i = 0U; i < nSamples; i++)
m_outputRB.put(0);
}
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