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159 lines
4.1 KiB
159 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - Hotspot Firmware
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (C) 2009-2017 Jonathan Naylor, G4KLX
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* Copyright (C) 2017,2018 Andy Uribe, CA6JAU
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*
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*/
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#include "Globals.h"
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#include "dmr/DMRIdleRX.h"
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#include "dmr/DMRSlotType.h"
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#include "Utils.h"
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using namespace dmr;
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#if defined(DUPLEX)
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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const uint8_t MAX_SYNC_BYTES_ERRS = 2U;
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const uint16_t NOENDPTR = 9999U;
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const uint8_t CONTROL_IDLE = 0x80U;
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const uint8_t CONTROL_DATA = 0x40U;
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/* Initializes a new instance of the DMRIdleRX class. */
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DMRIdleRX::DMRIdleRX() :
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m_bitBuffer(0U),
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m_buffer(),
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m_dataPtr(0U),
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m_endPtr(NOENDPTR),
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m_colorCode(0U)
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{
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/* stub */
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}
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/* Helper to reset data values to defaults. */
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void DMRIdleRX::reset()
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{
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m_dataPtr = 0U;
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m_endPtr = NOENDPTR;
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}
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/* Sample DMR bits from the air interface. */
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void DMRIdleRX::databit(bool bit)
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{
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_WRITE_BIT(m_buffer, m_dataPtr, bit);
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m_bitBuffer <<= 1;
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if (bit)
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m_bitBuffer |= 0x01U;
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if (countBits64((m_bitBuffer & DMR_SYNC_BITS_MASK) ^ DMR_MS_DATA_SYNC_BITS) <= MAX_SYNC_BYTES_ERRS) {
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
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if (m_endPtr >= DMR_IDLE_LENGTH_BITS)
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m_endPtr -= DMR_IDLE_LENGTH_BITS;
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DEBUG3("DMRIdleRx::databit() dataPtr/endPtr", m_dataPtr, m_endPtr);
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}
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if (m_dataPtr == m_endPtr) {
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uint16_t ptr = m_endPtr + DMR_IDLE_LENGTH_BITS - DMR_FRAME_LENGTH_BITS + 1;
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if (ptr >= DMR_IDLE_LENGTH_BITS)
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ptr -= DMR_IDLE_LENGTH_BITS;
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uint8_t frame[DMR_FRAME_LENGTH_BYTES + 1U];
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bitsToBytes(ptr, DMR_FRAME_LENGTH_BYTES, frame + 1U);
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uint8_t colorCode;
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uint8_t dataType;
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DMRSlotType slotType;
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slotType.decode(frame + 1U, colorCode, dataType);
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if (colorCode == m_colorCode && dataType == DT_CSBK) {
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frame[0U] = CONTROL_IDLE | CONTROL_DATA | DT_CSBK;
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serial.writeDMRData(false, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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}
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m_endPtr = NOENDPTR;
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}
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m_dataPtr++;
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if (m_dataPtr >= DMR_IDLE_LENGTH_BITS)
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m_dataPtr = 0U;
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}
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/* Sets the DMR color code. */
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void DMRIdleRX::setColorCode(uint8_t colorCode)
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{
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m_colorCode = colorCode;
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}
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// ---------------------------------------------------------------------------
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// Private Class Members
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// ---------------------------------------------------------------------------
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/* */
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void DMRIdleRX::bitsToBytes(uint16_t start, uint8_t count, uint8_t* buffer)
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{
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for (uint8_t i = 0U; i < count; i++) {
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buffer[i] = 0U;
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buffer[i] |= _READ_BIT(m_buffer, start) << 7;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 6;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 5;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 4;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 3;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 2;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 1;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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buffer[i] |= _READ_BIT(m_buffer, start) << 0;
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start++;
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if (start >= DMR_IDLE_LENGTH_BITS)
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start -= DMR_IDLE_LENGTH_BITS;
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}
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}
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#endif // DUPLEX
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