bool CDMRDMORX::processSample(q15_t sample, uint16_t rssi)
{
m_buffer[m_dataPtr] = sample;
m_rssi[m_dataPtr] = rssi;
m_bitBuffer[m_bitPtr] <<= 1;
if (sample < 0)
m_bitBuffer[m_bitPtr] |= 0x01U;
if (m_state == DMORXS_NONE) {
correlateSync(true);
} else {
uint16_t min = m_syncPtr + DMO_BUFFER_LENGTH_SAMPLES - 1U;
uint16_t max = m_syncPtr + 1U;
if (min >= DMO_BUFFER_LENGTH_SAMPLES)
min -= DMO_BUFFER_LENGTH_SAMPLES;
if (max >= DMO_BUFFER_LENGTH_SAMPLES)
max -= DMO_BUFFER_LENGTH_SAMPLES;
if (min < max) {
if (m_dataPtr >= min && m_dataPtr <= max)
correlateSync(false);
} else {
if (m_dataPtr >= min || m_dataPtr <= max)
correlateSync(false);
}
}
if (m_dataPtr == m_endPtr) {
// Find the average centre and threshold values
q15_t centre = (m_centre[0U] + m_centre[1U] + m_centre[2U] + m_centre[3U]) >> 2;
q15_t threshold = (m_threshold[0U] + m_threshold[1U] + m_threshold[2U] + m_threshold[3U]) >> 2;
uint8_t frame[DMR_FRAME_LENGTH_BYTES + 3U];
frame[0U] = m_control;
uint16_t ptr = m_endPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
if (ptr >= DMO_BUFFER_LENGTH_SAMPLES)
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
if (m_control == CONTROL_DATA) {
// Data sync
uint8_t colorCode;
uint8_t dataType;
CDMRSlotType slotType;
slotType.decode(frame + 1U, colorCode, dataType);
if (colorCode == m_colorCode) {
m_syncCount = 0U;
m_n = 0U;
frame[0U] |= dataType;
switch (dataType) {
case DT_DATA_HEADER:
DEBUG4("DMRDMORX: data header found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
m_state = DMORXS_DATA;
m_type = 0x00U;
break;
case DT_RATE_12_DATA:
case DT_RATE_34_DATA:
case DT_RATE_1_DATA:
if (m_state == DMORXS_DATA) {
DEBUG4("DMRDMORX: data payload found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
m_type = dataType;
}
break;
case DT_VOICE_LC_HEADER:
DEBUG4("DMRDMORX: voice header found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
m_state = DMORXS_VOICE;
break;
case DT_VOICE_PI_HEADER:
if (m_state == DMORXS_VOICE) {
DEBUG4("DMRDMORX: voice pi header found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
}
m_state = DMORXS_VOICE;
break;
case DT_TERMINATOR_WITH_LC:
if (m_state == DMORXS_VOICE) {
DEBUG4("DMRDMORX: voice terminator found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
reset();
}
break;
default: // DT_CSBK
DEBUG4("DMRDMORX: csbk found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
reset();
break;
}
}
} else if (m_control == CONTROL_VOICE) {
// Voice sync
DEBUG4("DMRDMORX: voice sync found pos/centre/threshold", m_syncPtr, centre, threshold);
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
m_state = DMORXS_VOICE;
m_syncCount = 0U;
m_n = 0U;
} else {
if (m_state != DMORXS_NONE) {
m_syncCount++;
if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
serial.writeDMRLost(true);
reset();
}
}
if (m_state == DMORXS_VOICE) {
if (m_n >= 5U) {
frame[0U] = CONTROL_VOICE;
m_n = 0U;
} else {
frame[0U] = ++m_n;
}
serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
} else if (m_state == DMORXS_DATA) {
if (m_type != 0x00U) {
frame[0U] = CONTROL_DATA | m_type;
writeRSSIData(frame);
#if defined(DUMP_SAMPLES)
writeSamples(ptr, frame[0U]);
#endif
}
}
}
// End of this slot, reset some items for the next slot.
m_maxCorr = 0;
m_control = CONTROL_NONE;
}
bool CDMRSlotRX::processSample(q15_t sample)
{
m_delayPtr++;
if (m_delayPtr < m_delay)
return m_state != DMRRXS_NONE;
if (m_state != DMRRXS_NONE) {
if (m_dataPtr > m_startPtr && m_dataPtr < m_endPtr)
io.setADCDetection(true);
else
io.setADCDetection(false);
} else {
io.setADCDetection(false);
}
// Ensure that the buffer doesn't overflow
if (m_dataPtr > m_endPtr || m_dataPtr >= 900U)
return m_state != DMRRXS_NONE;
m_buffer[m_dataPtr] = sample;
m_bitBuffer[m_bitPtr] <<= 1;
if (sample < 0)
m_bitBuffer[m_bitPtr] |= 0x01U;
if (m_state == DMRRXS_NONE) {
if (m_dataPtr >= SCAN_START && m_dataPtr <= SCAN_END)
correlateSync(true);
} else {
uint16_t min = m_syncPtr - 1U;
uint16_t max = m_syncPtr + 1U;
if (m_dataPtr >= min && m_dataPtr <= max)
correlateSync(false);
}
if (m_dataPtr == m_endPtr) {
// Find the average centre and threshold values
q15_t centre = (m_centre[0U] + m_centre[1U] + m_centre[2U] + m_centre[3U]) >> 2;
q15_t threshold = (m_threshold[0U] + m_threshold[1U] + m_threshold[2U] + m_threshold[3U]) >> 2;
uint8_t frame[DMR_FRAME_LENGTH_BYTES + 1U];
frame[0U] = m_control;
uint16_t ptr = m_endPtr - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
if (m_control == CONTROL_DATA) {
// Data sync
uint8_t colorCode;
uint8_t dataType;
CDMRSlotType slotType;
slotType.decode(frame + 1U, colorCode, dataType);
if (colorCode == m_colorCode) {
m_syncCount = 0U;
m_n = 0U;
frame[0U] |= dataType;
switch (dataType) {
case DT_DATA_HEADER:
DEBUG5("DMRSlotRX: data header found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_DATA;
m_type = 0x00U;
break;
case DT_RATE_12_DATA:
case DT_RATE_34_DATA:
case DT_RATE_1_DATA:
if (m_state == DMRRXS_DATA) {
DEBUG5("DMRSlotRX: data payload found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_type = dataType;
}
break;
case DT_VOICE_LC_HEADER:
DEBUG5("DMRSlotRX: voice header found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_VOICE;
break;
case DT_VOICE_PI_HEADER:
if (m_state == DMRRXS_VOICE) {
DEBUG5("DMRSlotRX: voice pi header found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
m_state = DMRRXS_VOICE;
break;
case DT_TERMINATOR_WITH_LC:
if (m_state == DMRRXS_VOICE) {
DEBUG5("DMRSlotRX: voice terminator found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
}
break;
default: // DT_CSBK
DEBUG5("DMRSlotRX: csbk found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
break;
}
}
} else if (m_control == CONTROL_VOICE) {
// Voice sync
DEBUG5("DMRSlotRX: voice sync found slot/pos/centre/threshold", m_slot ? 2U : 1U, m_syncPtr, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_VOICE;
m_syncCount = 0U;
m_n = 0U;
} else {
if (m_state != DMRRXS_NONE) {
m_syncCount++;
if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
serial.writeDMRLost(m_slot);
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
}
}
if (m_state == DMRRXS_VOICE) {
if (m_n >= 5U) {
frame[0U] = CONTROL_VOICE;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_n = 0U;
} else {
frame[0U] = ++m_n;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
} else if (m_state == DMRRXS_DATA) {
if (m_type != 0x00U) {
frame[0U] = CONTROL_DATA | m_type;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
}
}
}
bool CDMRSlotRX::processSample(q15_t sample)
{
// Ensure that the buffer doesn't overflow
if (m_dataPtr > m_endPtr || m_dataPtr >= 900U)
return m_receiving;
m_buffer[m_dataPtr] = sample;
// The approximate position of the sync samples, XXX to be updated later
// XXX change range when m_endPtr is set, make it tighter.
if (m_dataPtr >= 160U && m_dataPtr <= 530U)
correlateSync(sample);
if (m_dataPtr == m_endPtr) {
uint8_t frame[DMR_FRAME_LENGTH_BYTES + 1U];
frame[0U] = m_control;
uint16_t ptr = m_endPtr - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centre, m_threshold);
if (m_control == 0x40U) {
// Data sync
uint8_t colorCode;
uint8_t dataType;
CDMRSlotType slotType;
slotType.decode(frame + 1U, colorCode, dataType);
frame[0U] |= dataType;
switch (dataType) {
case DT_DATA_HEADER:
case DT_VOICE_LC_HEADER:
case DT_VOICE_PI_HEADER:
DEBUG4("DMRSlotRX: header for slot/color code/data type", m_slot ? 2U : 1U, colorCode, dataType);
m_receiving = true;
m_syncCount = 0U;
m_n = 0U;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
break;
case DT_TERMINATOR_WITH_LC:
DEBUG3("DMRSlotRX: terminator for slot/color code", m_slot ? 2U : 1U, colorCode);
m_receiving = false;
m_endPtr = 999U;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
break;
default:
DEBUG4("DMRSlotRX: data sync for slot/color code/data type", m_slot ? 2U : 1U, colorCode, dataType);
m_receiving = false;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
break;
}
} else if (m_control == 0x20U) {
// Voice sync
DEBUG2("DMRSlotRX: voice sync for slot", m_slot ? 2U : 1U);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_receiving = true;
m_syncCount = 0U;
m_n = 0U;
} else {
// Voice data
frame[0U] |= ++m_n;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
}
m_dataPtr++;
return m_receiving;
}
