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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"
q15_t FILTER_COEFFS[] = {
-4, 0, 1, -2, -9, -15, -16, -11, -2, 4, 6, 1, -7, -15,
-17, -9, 3, 16, 21, 14, 0, -12, -14, -1, 21, 43, 51, 41,
19, -1, -5, 14, 50, 85, 98, 81, 44, 9, 0, 28, 80, 130,
147, 120, 60, 2, -17, 16, 88, 157, 178, 132, 39, -52, -90, -49,
46, 140, 166, 96, -42, -182, -245, -195, -63, 67, 106, 7, -194, -399,
-496, -429, -238, -41, 26, -106, -396, -697, -843, -743, -444, -121, 12, -165,
-603, -1084, -1329, -1163, -629, -6, 320, 67, -759, -1803, -2474, -2204, -739, 1695,
4421, 6556, 7363, 6556, 4421, 1695, -739, -2204, -2474, -1803, -759, 67, 320, -6,
-629, -1163, -1329, -1084, -603, -165, 12, -121, -444, -743, -843, -697, -396, -106,
26, -41, -238, -429, -496, -399, -194, 7, 106, 67, -63, -195, -245, -182,
-42, 96, 166, 140, 46, -49, -90, -52, 39, 132, 178, 157, 88, 16,
-17, 2, 60, 120, 147, 130, 80, 28, 0, 9, 44, 81, 98, 85,
50, 14, -5, -1, 19, 41, 51, 43, 21, -1, -14, -12, 0, 14,
21, 16, 3, -9, -17, -15, -7, 1, 6, 4, -2, -11, -16, -15,
-9, -2, 1, 0, -4};
const uint16_t FILTER_COEFFS_LEN = 201U;
CFM::CFM() :
m_filter(),
m_filterState(),
m_callsign(),
m_rfAck(),
m_goertzel(),
m_ctcss(),
m_timeoutTone(),
m_state(FS_LISTENING),
m_callsignAtStart(false),
m_callsignAtEnd(false),
m_callsignTimer(),
m_timeoutTimer(),
m_holdoffTimer(),
m_kerchunkTimer(),
m_ackMinTimer(),
m_ackDelayTimer(),
m_hangTimer()
{
::memset(m_filterState, 0x00U, 230U * sizeof(q15_t));
m_filter.numTaps = FILTER_COEFFS_LEN;
m_filter.pState = m_filterState;
m_filter.pCoeffs = FILTER_COEFFS;
}
void CFM::samples(q15_t* samples, uint8_t length)
{
bool validSignal = m_goertzel.process(samples, length);
stateMachine(validSignal, length);
if (m_modemState != STATE_FM)
return;
// Only let audio through when relaying audio
if (m_state != FS_RELAYING) {
for (uint8_t i = 0U; i < length; i++)
samples[i] = 0;
}
if (!m_callsign.isRunning())
m_rfAck.getAudio(samples, length);
if (!m_rfAck.isRunning())
m_callsign.getAudio(samples, length);
if (!m_callsign.isRunning() && !m_rfAck.isRunning())
m_timeoutTone.getAudio(samples, length);
q15_t output[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_filter, samples, output, length);
m_ctcss.getAudio(output, length);
io.write(STATE_FM, output, length);
}
void CFM::process()
{
}
void CFM::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)
{
m_callsignAtStart = callsignAtStart;
m_callsignAtEnd = callsignAtEnd;
uint16_t holdoffTime = 0U;
uint16_t callsignTime = time * 60U;
if (holdoff > 0U)
holdoffTime = callsignTime / holdoff;
m_holdoffTimer.setTimeout(holdoffTime, 0U);
m_callsignTimer.setTimeout(callsignTime, 0U);
return m_callsign.setParams(callsign, speed, frequency, 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);
m_ackMinTimer.setTimeout(minTime, 0U);
return m_rfAck.setParams(rfAck, speed, frequency, 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)
{
m_timeoutTimer.setTimeout(timeout, 0U);
m_kerchunkTimer.setTimeout(kerchunkTime, 0U);
m_hangTimer.setTimeout(hangTime, 0U);
m_timeoutTone.setParams(timeoutLevel);
m_goertzel.setParams(ctcssFrequency, ctcssThreshold);
return m_ctcss.setParams(ctcssFrequency, ctcssLevel);
}
void CFM::stateMachine(bool validSignal, 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);
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())
m_modemState = STATE_IDLE;
}
}
void CFM::listeningState(bool validSignal)
{
if (m_kerchunkTimer.getTimeout() > 0U) {
m_state = FS_KERCHUNK;
m_kerchunkTimer.start();
} else {
m_state = FS_RELAYING;
if (m_callsignAtStart)
sendCallsign();
}
beginRelaying();
m_callsignTimer.start();
m_modemState = STATE_FM;
}
void CFM::kerchunkState(bool validSignal)
{
if (validSignal) {
if (m_kerchunkTimer.hasExpired()) {
m_state = FS_RELAYING;
m_kerchunkTimer.stop();
}
} else {
m_state = FS_LISTENING;
m_kerchunkTimer.stop();
m_timeoutTimer.stop();
m_ackMinTimer.stop();
m_callsignTimer.stop();
m_holdoffTimer.stop();
}
}
void CFM::relayingState(bool validSignal)
{
if (validSignal) {
if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired()) {
m_state = FS_TIMEOUT;
m_ackMinTimer.stop();
m_timeoutTimer.stop();
m_timeoutTone.start();
}
} else {
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) {
m_state = FS_RELAYING;
m_ackDelayTimer.stop();
} else {
if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
m_state = FS_HANG;
if (m_ackMinTimer.isRunning()) {
if (m_ackMinTimer.hasExpired()) {
m_rfAck.start();
m_ackMinTimer.stop();
}
} else {
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) {
m_state = FS_RELAYING;
m_rfAck.stop();
beginRelaying();
} else {
if (m_hangTimer.isRunning() && m_hangTimer.hasExpired()) {
m_state = FS_LISTENING;
m_hangTimer.stop();
if (m_callsignAtEnd)
sendCallsign();
m_callsignTimer.stop();
m_holdoffTimer.stop();
}
}
if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
sendCallsign();
m_callsignTimer.start();
}
}
void CFM::timeoutState(bool validSignal)
{
if (!validSignal) {
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) {
m_state = FS_TIMEOUT;
m_ackDelayTimer.stop();
} else {
if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
m_state = FS_HANG;
m_timeoutTone.stop();
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()) {
m_callsign.start();
m_holdoffTimer.start();
}
} else {
m_callsign.start();
}
}
void CFM::beginRelaying()
{
m_timeoutTimer.start();
m_ackMinTimer.start();
}
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