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90 lines
2.6 KiB
90 lines
2.6 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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* @package DVM / Hotspot Firmware
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* @derivedfrom MMDVM_HS (https://github.com/g4klx/MMDVM_HS)
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* @license GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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*
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* Copyright (C) 2015,2016,2017,2018,2020 Jonathan Naylor, G4KLX
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* Copyright (C) 2022 Bryan Biedenkapp, N2PLL
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*
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*/
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#if !defined(__NXDN_TX_H__)
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#define __NXDN_TX_H__
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#include "Defines.h"
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#include "SerialBuffer.h"
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namespace nxdn
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{
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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#define NXDN_FIXED_TX_HANG 600
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enum NXDNTXSTATE {
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NXDNTXSTATE_NORMAL,
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NXDNTXSTATE_CAL
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// Implements transmitter logic for NXDN mode operation.
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// ---------------------------------------------------------------------------
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class DSP_FW_API NXDNTX {
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public:
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/// <summary>Initializes a new instance of the NXDNTX class.</summary>
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NXDNTX();
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/// <summary>Process local buffer and transmit on the air interface.</summary>
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void process();
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/// <summary>Write data to the local buffer.</summary>
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uint8_t writeData(const uint8_t* data, uint16_t length);
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/// <summary>Clears the local buffer.</summary>
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void clear();
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/// <summary>Sets the FDMA preamble count.</summary>
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void setPreambleCount(uint8_t preambleCnt);
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/// <summary>Sets the transmit hang time.</summary>
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void setTxHang(uint8_t txHang);
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/// <summary>Helper to set the calibration state for Tx.</summary>
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void setCal(bool start);
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/// <summary>Helper to resize the FIFO buffer.</summary>
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void resizeBuffer(uint16_t size);
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/// <summary>Helper to get how much space the ring buffer has for samples.</summary>
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uint8_t getSpace() const;
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private:
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SerialBuffer m_fifo;
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NXDNTXSTATE m_state;
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uint8_t m_poBuffer[60U];
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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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/// <summary></summary>
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void createData();
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/// <summary></summary>
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void writeByte(uint8_t c);
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/// <summary></summary>
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void writeSilence();
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};
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} // namespace nxdn
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#endif // __NXDN_TX_H__
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