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Add level averaging to the DMR slot receiver.

48kHz
Jonathan Naylor 2016-04-11 11:06:52 +01:00
parent 48fb023f1d
commit a6fd81bae4
2 changed files with 64 additions and 39 deletions
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96
DMRSlotRX.cpp
View File

@ -51,8 +51,9 @@ m_syncPtr(0U),
m_endPtr(NOENDPTR),
m_delayPtr(0U),
m_maxCorr(0),
m_centre(0),
m_threshold(0),
m_centre(),
m_threshold(),
m_averagePtr(0U),
m_control(CONTROL_NONE),
m_syncCount(0U),
m_colorCode(0U),
@ -81,8 +82,6 @@ void CDMRSlotRX::reset()
m_maxCorr = 0;
m_control = CONTROL_NONE;
m_syncCount = 0U;
m_threshold = 0;
m_centre = 0;
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
}
@ -105,20 +104,24 @@ bool CDMRSlotRX::processSample(q15_t sample)
if (m_state == DMRRXS_NONE) {
if (m_dataPtr >= 420U && m_dataPtr <= 455U)
correlateSync();
correlateSync(true);
} else {
uint16_t min = m_syncPtr - 1U;
uint16_t max = m_syncPtr + 1U;
if (m_dataPtr >= min && m_dataPtr <= max)
correlateSync();
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, m_centre, m_threshold);
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
if (m_control == CONTROL_DATA) {
// Data sync
@ -135,42 +138,42 @@ bool CDMRSlotRX::processSample(q15_t sample)
switch (dataType) {
case DT_DATA_HEADER:
DEBUG5("DMRSlotRX: data header found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: data header found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_DATA;
m_type = dataType;
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, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: data payload found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_type = dataType;
m_type = dataType;
}
break;
case DT_VOICE_LC_HEADER:
DEBUG5("DMRSlotRX: voice header found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: voice header found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, 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, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: voice pi header found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, 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, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: voice terminator found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, 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, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: csbk found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
@ -179,7 +182,7 @@ bool CDMRSlotRX::processSample(q15_t sample)
}
} else if (m_control == CONTROL_VOICE) {
// Voice sync
DEBUG5("DMRSlotRX: voice sync found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, m_centre, m_threshold);
DEBUG5("DMRSlotRX: voice sync found slot/pos/centre/threshold", m_slot ? 2U : 1U, int16_t(m_dataPtr) - 420, centre, threshold);
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
m_state = DMRRXS_VOICE;
m_syncCount = 0U;
@ -189,11 +192,8 @@ bool CDMRSlotRX::processSample(q15_t sample)
m_syncCount++;
if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
serial.writeDMRLost(m_slot);
m_syncCount = 0U;
m_threshold = 0;
m_centre = 0;
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
m_state = DMRRXS_NONE;
m_endPtr = NOENDPTR;
}
}
@ -207,8 +207,10 @@ bool CDMRSlotRX::processSample(q15_t sample)
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
} else if (m_state == DMRRXS_DATA) {
frame[0U] = CONTROL_DATA | m_type;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
if (m_type != 0x00U) {
frame[0U] = CONTROL_DATA | m_type;
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
}
}
}
}
@ -222,7 +224,7 @@ bool CDMRSlotRX::processSample(q15_t sample)
return m_state != DMRRXS_NONE;
}
void CDMRSlotRX::correlateSync()
void CDMRSlotRX::correlateSync(bool first)
{
uint8_t errs = countBits32((m_bitBuffer[m_bitPtr] & DMR_SYNC_SYMBOLS_MASK) ^ DMR_MS_DATA_SYNC_SYMBOLS);
@ -270,12 +272,23 @@ void CDMRSlotRX::correlateSync()
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_DATA_SYNC_BYTES[i]);
if (errs <= MAX_SYNC_BYTES_ERRS) {
m_maxCorr = corr;
m_centre = centre;
m_threshold = threshold;
m_control = CONTROL_DATA;
m_syncPtr = m_dataPtr;
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
if (first) {
m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
m_averagePtr = 0U;
} else {
m_threshold[m_averagePtr] = threshold;
m_centre[m_averagePtr] = centre;
m_averagePtr++;
if (m_averagePtr >= 4U)
m_averagePtr = 0U;
}
m_maxCorr = corr;
m_control = CONTROL_DATA;
m_syncPtr = m_dataPtr;
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
}
} else { // if (voice)
uint8_t errs = 0U;
@ -283,12 +296,23 @@ void CDMRSlotRX::correlateSync()
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_VOICE_SYNC_BYTES[i]);
if (errs <= MAX_SYNC_BYTES_ERRS) {
m_maxCorr = corr;
m_centre = centre;
m_threshold = threshold;
m_control = CONTROL_VOICE;
m_syncPtr = m_dataPtr;
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
if (first) {
m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
m_averagePtr = 0U;
} else {
m_threshold[m_averagePtr] = threshold;
m_centre[m_averagePtr] = centre;
m_averagePtr++;
if (m_averagePtr >= 4U)
m_averagePtr = 0U;
}
m_maxCorr = corr;
m_control = CONTROL_VOICE;
m_syncPtr = m_dataPtr;
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
}
}
}

7
DMRSlotRX.h
View File

@ -51,8 +51,9 @@ private:
uint16_t m_endPtr;
uint16_t m_delayPtr;
q31_t m_maxCorr;
q15_t m_centre;
q15_t m_threshold;
q15_t m_centre[4U];
q15_t m_threshold[4U];
uint8_t m_averagePtr;
uint8_t m_control;
uint8_t m_syncCount;
uint8_t m_colorCode;
@ -61,7 +62,7 @@ private:
uint8_t m_n;
uint8_t m_type;
void correlateSync();
void correlateSync(bool first);
void samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
};