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77 lines
2.7 KiB
77 lines
2.7 KiB
/*
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* Copyright (C) 2011-2014 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef GMSKController_H
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#define GMSKController_H
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#include "DStarDefines.h"
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#include "RingBuffer.h"
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#include "GMSKModem.h"
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#include "Modem.h"
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#include "Utils.h"
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#include "StdCompat.h"
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/*
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* CGMSKController - CModem driver that bridges the repeater to an IGMSKModem.
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*
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* Owns an IGMSKModem* (currently always a CGMSKModemLibUsb instance) and
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* presents the standard CModem interface to the repeater thread.
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*
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* entry() loop (runs ~15ms cycle):
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* Receive side: polls readHeader() every 100ms when idle. On a valid header,
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* switches to data mode and calls readData() every loop until end is signalled.
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* Received bytes are accumulated in a local buffer until a full DV_FRAME_LENGTH
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* (12 bytes) is available, then forwarded to m_rxData.
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*
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* Transmit side: reads type/length/data from m_txData ring buffer. For headers,
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* waits until the hardware PTT is deasserted before calling writeHeader() +
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* setPTT(true). For data frames, waits 100ms after the header (dataTimer) then
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* polls hasSpace() before each writeData(). On EOT, calls setPTT(false).
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*
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* duplex: when true, RX and TX can occur simultaneously. When false, TX
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* suppresses RX polling and vice versa.
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*
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* reopenModem(): called on any negative return from an IGMSKModem method.
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* Closes the modem, clears m_txData, and retries open() every 1s indefinitely.
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*/
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class CGMSKController : public CModem {
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public:
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CGMSKController(USB_INTERFACE iface, unsigned int address, bool duplex);
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virtual ~CGMSKController();
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virtual bool start();
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virtual unsigned int getSpace();
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virtual bool isTXReady();
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virtual bool writeHeader(const CHeaderData& header);
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virtual bool writeData(const unsigned char* data, unsigned int length, bool end);
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private:
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void entry();
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IGMSKModem* m_modem;
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bool m_duplex;
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unsigned char* m_buffer;
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CRingBuffer<unsigned char> m_txData;
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bool reopenModem();
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};
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#endif
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