You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
434 lines
14 KiB
434 lines
14 KiB
/**
|
|
* Digital Voice Modem - DSP Firmware (Hotspot)
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / DSP Firmware (Hotspot)
|
|
*
|
|
*/
|
|
//
|
|
// Based on code from the MMDVM_HS project. (https://github.com/juribeparada/MMDVM_HS)
|
|
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
|
|
//
|
|
/*
|
|
* Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
|
|
* Copyright (C) 2017,2018 by Andy Uribe CA6JAU
|
|
* Copyright (C) 2021 Bryan Biedenkapp N2PLL
|
|
*
|
|
* 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 "Globals.h"
|
|
#include "dmr/DMRSlotRX.h"
|
|
#include "dmr/DMRSlotType.h"
|
|
#include "Utils.h"
|
|
|
|
using namespace dmr;
|
|
|
|
#if defined(DUPLEX)
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Constants
|
|
// ---------------------------------------------------------------------------
|
|
|
|
const uint8_t MAX_SYNC_BYTES_ERRS = 3U;
|
|
|
|
const uint8_t MAX_SYNC_LOST_FRAMES = 13U;
|
|
|
|
const uint16_t NOENDPTR = 9999U;
|
|
|
|
const uint8_t CONTROL_NONE = 0x00U;
|
|
const uint8_t CONTROL_VOICE = 0x20U;
|
|
const uint8_t CONTROL_DATA = 0x40U;
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Public Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the DMRSlotRX class.
|
|
/// </summary>
|
|
DMRSlotRX::DMRSlotRX(bool slot) :
|
|
m_slot(slot),
|
|
m_bitBuffer(0x00U),
|
|
m_buffer(),
|
|
m_dataPtr(0U),
|
|
m_syncPtr(0U),
|
|
m_startPtr(0U),
|
|
m_endPtr(NOENDPTR),
|
|
m_delayPtr(0U),
|
|
m_control(CONTROL_NONE),
|
|
m_syncCount(0U),
|
|
m_colorCode(0U),
|
|
m_delay(0U),
|
|
m_state(DMRRXS_NONE),
|
|
m_n(0U),
|
|
m_type(0U)
|
|
{
|
|
/* stub */
|
|
}
|
|
|
|
/// <summary>
|
|
/// Helper to set data values for start of Rx.
|
|
/// </summary>
|
|
void DMRSlotRX::start()
|
|
{
|
|
m_dataPtr = 0U;
|
|
m_delayPtr = 0U;
|
|
m_control = CONTROL_NONE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Helper to reset data values to defaults.
|
|
/// </summary>
|
|
void DMRSlotRX::reset()
|
|
{
|
|
m_dataPtr = 0U;
|
|
m_delayPtr = 0U;
|
|
|
|
m_bitBuffer = 0U;
|
|
|
|
resetSlot();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sample DMR bits from the air interface.
|
|
/// </summary>
|
|
/// <param name="bit"></param>
|
|
bool DMRSlotRX::databit(bool bit)
|
|
{
|
|
uint16_t min, max;
|
|
|
|
m_delayPtr++;
|
|
if (m_delayPtr < m_delay)
|
|
return m_state != DMRRXS_NONE;
|
|
|
|
_WRITE_BIT(m_buffer, m_dataPtr, bit);
|
|
|
|
m_bitBuffer <<= 1;
|
|
if (bit)
|
|
m_bitBuffer |= 0x01U;
|
|
|
|
// Ensure that the buffer doesn't overflow
|
|
if (m_dataPtr > m_endPtr || m_dataPtr >= 576U)
|
|
return m_state != DMRRXS_NONE;
|
|
|
|
if (m_state == DMRRXS_NONE) {
|
|
correlateSync();
|
|
}
|
|
else {
|
|
uint16_t min = m_syncPtr + DMR_BUFFER_LENGTH_BITS - 2U;
|
|
uint16_t max = m_syncPtr + 2U;
|
|
|
|
if (min >= DMR_BUFFER_LENGTH_BITS)
|
|
min -= DMR_BUFFER_LENGTH_BITS;
|
|
if (max >= DMR_BUFFER_LENGTH_BITS)
|
|
max -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
if (min < max) {
|
|
if (m_dataPtr >= min && m_dataPtr <= max)
|
|
correlateSync();
|
|
} else {
|
|
if (m_dataPtr >= min || m_dataPtr <= max)
|
|
correlateSync();
|
|
}
|
|
}
|
|
|
|
if (m_dataPtr == m_endPtr) {
|
|
uint8_t frame[DMR_FRAME_LENGTH_BYTES + 3U];
|
|
frame[0U] = m_control;
|
|
|
|
bitsToBytes(m_startPtr, DMR_FRAME_LENGTH_BYTES, frame + 1U);
|
|
|
|
if (m_control == CONTROL_DATA) {
|
|
// Data sync
|
|
uint8_t colorCode;
|
|
uint8_t dataType;
|
|
DMRSlotType 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:
|
|
DEBUG3("DMRSlotRX: databit(): data header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
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) {
|
|
DEBUG3("DMRSlotRX: databit(): data payload found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
m_type = dataType;
|
|
}
|
|
break;
|
|
case DT_VOICE_LC_HEADER:
|
|
DEBUG3("DMRSlotRX: databit(): voice header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
m_state = DMRRXS_VOICE;
|
|
break;
|
|
case DT_VOICE_PI_HEADER:
|
|
if (m_state == DMRRXS_VOICE) {
|
|
DEBUG3("DMRSlotRX: databit(): voice pi header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
}
|
|
m_state = DMRRXS_VOICE;
|
|
break;
|
|
case DT_TERMINATOR_WITH_LC:
|
|
if (m_state == DMRRXS_VOICE) {
|
|
DEBUG3("DMRSlotRX: databit(): voice terminator found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
m_state = DMRRXS_NONE;
|
|
m_endPtr = NOENDPTR;
|
|
}
|
|
break;
|
|
default: // DT_CSBK
|
|
DEBUG3("DMRSlotRX: databit(): csbk found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
m_state = DMRRXS_NONE;
|
|
m_endPtr = NOENDPTR;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else if (m_control == CONTROL_VOICE) {
|
|
// Voice sync
|
|
DEBUG3("DMRSlotRX: databit(): voice sync found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
|
|
writeRSSIData(frame);
|
|
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) {
|
|
DEBUG1("DMRSlotRX: databit(): sync timeout, lost lock");
|
|
serial.writeDMRLost(m_slot);
|
|
resetSlot();
|
|
}
|
|
}
|
|
|
|
if (m_state == DMRRXS_VOICE) {
|
|
if (m_n >= 5U) {
|
|
frame[0U] = CONTROL_VOICE;
|
|
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;
|
|
writeRSSIData(frame);
|
|
}
|
|
}
|
|
}
|
|
|
|
// end of this slot, reset some items for the next slot
|
|
m_control = CONTROL_NONE;
|
|
}
|
|
|
|
m_dataPtr++;
|
|
if (m_dataPtr >= DMR_BUFFER_LENGTH_BITS)
|
|
m_dataPtr = 0U;
|
|
|
|
return m_state != DMRRXS_NONE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sets the DMR color code.
|
|
/// </summary>
|
|
/// <param name="colorCode">Color code.</param>
|
|
void DMRSlotRX::setColorCode(uint8_t colorCode)
|
|
{
|
|
m_colorCode = colorCode;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sets the number of samples to delay before processing.
|
|
/// </summary>
|
|
/// <param name="delay">Number of samples to delay.</param>
|
|
void DMRSlotRX::setRxDelay(uint8_t delay)
|
|
{
|
|
m_delay = delay;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Private Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Frame synchronization correlator.
|
|
/// </summary>
|
|
/// <param name="first"></param>
|
|
void DMRSlotRX::correlateSync()
|
|
{
|
|
// unpack sync bytes
|
|
uint8_t sync[DMR_SYNC_BYTES_LENGTH];
|
|
sync[0U] = (uint8_t)((m_bitBuffer >> 48) & 0xFFU);
|
|
sync[1U] = (uint8_t)((m_bitBuffer >> 40) & 0xFFU);
|
|
sync[2U] = (uint8_t)((m_bitBuffer >> 32) & 0xFFU);
|
|
sync[3U] = (uint8_t)((m_bitBuffer >> 24) & 0xFFU);
|
|
sync[4U] = (uint8_t)((m_bitBuffer >> 16) & 0xFFU);
|
|
sync[5U] = (uint8_t)((m_bitBuffer >> 8) & 0xFFU);
|
|
sync[6U] = (uint8_t)((m_bitBuffer >> 0) & 0xFFU);
|
|
|
|
if (countBits64((m_bitBuffer & DMR_SYNC_BITS_MASK) ^ DMR_MS_DATA_SYNC_BITS) <= MAX_SYNC_BYTES_ERRS) {
|
|
uint8_t errs = 0U;
|
|
for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
|
|
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_DATA_SYNC_BYTES[i]);
|
|
|
|
DEBUG2("DMRSlotRX: correlateSync(): correlateSync errs", errs);
|
|
|
|
DEBUG4("DMRSlotRX: correlateSync(): sync [b0 - b2]", sync[0], sync[1], sync[2]);
|
|
DEBUG4("DMRSlotRX: correlateSync(): sync [b3 - b5]", sync[3], sync[4], sync[5]);
|
|
DEBUG2("DMRSlotRX: correlateSync(): sync [b6]", sync[6]);
|
|
|
|
m_control = CONTROL_DATA;
|
|
m_syncPtr = m_dataPtr;
|
|
|
|
m_startPtr = m_dataPtr + DMR_BUFFER_LENGTH_BITS - DMR_SLOT_TYPE_LENGTH_BITS / 2U - DMR_INFO_LENGTH_BITS / 2U - DMR_SYNC_LENGTH_BITS + 1;
|
|
if (m_startPtr >= DMR_BUFFER_LENGTH_BITS)
|
|
m_startPtr -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
|
|
if (m_endPtr >= DMR_BUFFER_LENGTH_BITS)
|
|
m_endPtr -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
DEBUG4("DMRSlotRX: correlateSync(): dataPtr/startPtr/endPtr", m_dataPtr, m_startPtr, m_endPtr);
|
|
} else if (countBits64((m_bitBuffer & DMR_SYNC_BITS_MASK) ^ DMR_MS_VOICE_SYNC_BITS) <= MAX_SYNC_BYTES_ERRS) {
|
|
uint8_t errs = 0U;
|
|
for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
|
|
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_VOICE_SYNC_BYTES[i]);
|
|
|
|
DEBUG2("DMRSlotRX: correlateSync(): correlateSync errs", errs);
|
|
|
|
DEBUG4("DMRSlotRX: correlateSync(): sync [b0 - b2]", sync[0], sync[1], sync[2]);
|
|
DEBUG4("DMRSlotRX: correlateSync(): sync [b3 - b5]", sync[3], sync[4], sync[5]);
|
|
DEBUG2("DMRSlotRX: correlateSync(): sync [b6]", sync[6]);
|
|
|
|
m_control = CONTROL_VOICE;
|
|
m_syncPtr = m_dataPtr;
|
|
|
|
m_startPtr = m_dataPtr + DMR_BUFFER_LENGTH_BITS - DMR_SLOT_TYPE_LENGTH_BITS / 2U - DMR_INFO_LENGTH_BITS / 2U - DMR_SYNC_LENGTH_BITS + 1;
|
|
if (m_startPtr >= DMR_BUFFER_LENGTH_BITS)
|
|
m_startPtr -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
|
|
if (m_endPtr >= DMR_BUFFER_LENGTH_BITS)
|
|
m_endPtr -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
DEBUG4("DMRSlotRX: correlateSync(): dataPtr/startPtr/endPtr", m_dataPtr, m_startPtr, m_endPtr);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
void DMRSlotRX::resetSlot()
|
|
{
|
|
m_syncPtr = 0U;
|
|
|
|
m_control = CONTROL_NONE;
|
|
m_syncCount = 0U;
|
|
m_state = DMRRXS_NONE;
|
|
m_startPtr = 0U;
|
|
m_endPtr = NOENDPTR;
|
|
m_type = 0U;
|
|
m_n = 0U;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="start"></param>
|
|
/// <param name="count"></param>
|
|
/// <param name="buffer"></param>
|
|
void DMRSlotRX::bitsToBytes(uint16_t start, uint8_t count, uint8_t* buffer)
|
|
{
|
|
for (uint8_t i = 0U; i < count; i++) {
|
|
buffer[i] = 0U;
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 7;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 6;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 5;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 4;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 3;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 2;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 1;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
|
|
buffer[i] |= _READ_BIT(m_buffer, start) << 0;
|
|
start++;
|
|
if (start >= DMR_BUFFER_LENGTH_BITS)
|
|
start -= DMR_BUFFER_LENGTH_BITS;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="frame"></param>
|
|
void DMRSlotRX::writeRSSIData(uint8_t* frame)
|
|
{
|
|
#if defined(SEND_RSSI_DATA)
|
|
uint16_t rssi = io.readRSSI();
|
|
|
|
frame[34U] = (rssi >> 8) & 0xFFU;
|
|
frame[35U] = (rssi >> 0) & 0xFFU;
|
|
|
|
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 3U);
|
|
#else
|
|
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
|
|
#endif
|
|
}
|
|
|
|
#endif // DUPLEX
|