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138 lines
3.4 KiB
138 lines
3.4 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) 2016,2017 Jonathan Naylor, G4KLX
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* Copyright (C) 2016,2017 Andy Uribe, CA6JAU
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* Copyright (C) 2021-2022 Bryan Biedenkapp, N2PLL
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*
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*/
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/**
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* @file P25TX.h
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* @ingroup p25_hfw
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* @file P25TX.cpp
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* @ingroup p25_hfw
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*/
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#if !defined(__P25_TX_H__)
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#define __P25_TX_H__
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#include "Defines.h"
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#include "SerialBuffer.h"
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namespace p25
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{
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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#define P25_FIXED_DELAY 90 // 90 = 20ms
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#define P25_FIXED_TX_HANG 750 // 750 = 625ms
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/**
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* @brief P25 Transmitter State
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* @ingroup p25_hfw
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*/
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enum P25TXSTATE {
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P25TXSTATE_NORMAL, //! Normal
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P25TXSTATE_CAL //! Calibration
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// ---------------------------------------------------------------------------
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/**
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* @brief Implements transmitter logic for P25 mode operation.
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* @ingroup p25_hfw
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*/
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class DSP_FW_API P25TX {
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public:
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/**
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* @brief Initializes a new instance of the P25TX class.
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*/
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P25TX();
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/**
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* @brief Process local buffer and transmit on the air interface.
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*/
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void process();
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/**
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* @brief Write data to the local buffer.
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* @param[in] data Buffer.
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* @param length Length of buffer.
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* @returns uint8_t Reason code.
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*/
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uint8_t writeData(const uint8_t* data, uint16_t length);
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/**
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* @brief Clears the local buffer.
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*/
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void clear();
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/**
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* @brief Sets the FDMA preamble count.
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* @param preambleCnt FDMA preamble count.
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*/
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void setPreambleCount(uint8_t preambleCnt);
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/**
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* @brief Sets the transmit hang time.
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* @param txHang Transmit hang time.
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*/
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void setTxHang(uint8_t txHang);
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/**
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* @brief Helper to set the calibration state for Tx.
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* @param start
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*/
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void setCal(bool start);
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/**
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* @brief Helper to resize the FIFO buffer.
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* @param size
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*/
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void resizeBuffer(uint16_t size);
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/**
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* @brief Helper to get how much space the ring buffer has for samples.
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* @returns uint8_t Amount of space in ring buffer for samples.
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*/
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uint8_t getSpace() const;
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private:
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SerialBuffer m_fifo;
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P25TXSTATE m_state;
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uint8_t m_poBuffer[1200U];
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uint16_t m_poLen;
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uint16_t m_poPtr;
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uint16_t m_preambleCnt;
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uint32_t m_txHang;
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uint32_t m_tailCnt;
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/**
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* @brief Helper to generate data.
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*/
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void createData();
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/**
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* @brief Helper to generate calibration data.
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*/
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void createCal();
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/**
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* @brief Helper to write a raw byte to the DAC.
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* @param c Byte.
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*/
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void writeByte(uint8_t c);
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/**
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* @brief
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*/
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void writeSilence();
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};
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} // namespace p25
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#endif // __P25_TX_H__
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