185 lines
3.7 KiB
C++
185 lines
3.7 KiB
C++
/*
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* Copyright (C) 2021 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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#include "NullController.h"
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#include <cstdio>
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#include <cassert>
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const unsigned char MMDVM_FRAME_START = 0xE0U;
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const unsigned char MMDVM_GET_VERSION = 0x00U;
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const unsigned char MMDVM_GET_STATUS = 0x01U;
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const unsigned char MMDVM_SET_CONFIG = 0x02U;
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const unsigned char MMDVM_SET_MODE = 0x03U;
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const unsigned char MMDVM_SET_FREQ = 0x04U;
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const unsigned char MMDVM_FM_PARAMS1 = 0x60U;
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const unsigned char MMDVM_FM_PARAMS2 = 0x61U;
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const unsigned char MMDVM_FM_PARAMS3 = 0x62U;
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const unsigned char MMDVM_FM_PARAMS4 = 0x63U;
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const unsigned char MMDVM_ACK = 0x70U;
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const unsigned char MMDVM_NAK = 0x7FU;
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const unsigned char PROTOCOL_VERSION = 2U;
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const char* HARDWARE = "Null Modem Controller";
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CNullController::CNullController() :
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m_buffer(200U, "Null Controller Buffer")
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{
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}
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CNullController::~CNullController()
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{
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}
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bool CNullController::open()
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{
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return true;
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}
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int CNullController::read(unsigned char* buffer, unsigned int length)
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{
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unsigned int dataSize = m_buffer.dataSize();
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if (dataSize == 0U)
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return 0;
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if (length > dataSize)
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length = dataSize;
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m_buffer.getData(buffer, length);
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return int(length);
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}
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int CNullController::write(const unsigned char* buffer, unsigned int length)
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{
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switch (buffer[2U]) {
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case MMDVM_GET_VERSION:
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writeVersion();
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break;
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case MMDVM_GET_STATUS:
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writeStatus();
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break;
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case MMDVM_SET_CONFIG:
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case MMDVM_SET_FREQ:
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case MMDVM_SET_MODE:
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case MMDVM_FM_PARAMS1:
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case MMDVM_FM_PARAMS2:
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case MMDVM_FM_PARAMS3:
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case MMDVM_FM_PARAMS4:
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writeAck(buffer[2U]);
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break;
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default:
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break;
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}
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return int(length);
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}
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void CNullController::close()
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{
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}
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void CNullController::writeVersion()
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{
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unsigned char reply[200U];
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reply[0U] = MMDVM_FRAME_START;
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reply[1U] = 0U;
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reply[2U] = MMDVM_GET_VERSION;
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reply[3U] = PROTOCOL_VERSION;
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// Return two bytes of mode capabilities
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reply[4U] = 0xFFU;
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reply[5U] = 0xFFU;
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// CPU type/manufacturer. 0=Atmel ARM, 1=NXP ARM, 2=St-Micro ARM
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reply[6U] = 2U;
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// Reserve 16 bytes for the UDID
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::memset(reply + 7U, 0x00U, 16U);
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uint8_t count = 23U;
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for (uint8_t i = 0U; HARDWARE[i] != 0x00U; i++, count++)
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reply[count] = HARDWARE[i];
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reply[1U] = count;
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m_buffer.addData(reply, count);
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}
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void CNullController::writeStatus()
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{
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unsigned char reply[30U];
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// Send all sorts of interesting internal values
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reply[0U] = MMDVM_FRAME_START;
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reply[1U] = 20U;
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reply[2U] = MMDVM_GET_STATUS;
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reply[3U] = 0U;
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reply[4U] = 0x00U;
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reply[5U] = 0x00U;
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reply[6U] = 20U;
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reply[7U] = 20U;
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reply[8U] = 20U;
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reply[9U] = 20U;
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reply[10U] = 20U;
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reply[11U] = 20U;
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reply[12U] = 20U;
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reply[13U] = 20U;
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reply[14U] = 0x00U;
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reply[15U] = 0x00U;
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reply[16U] = 20U;
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reply[17U] = 20U;
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reply[18U] = 0x00U;
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reply[19U] = 0x00U;
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m_buffer.addData(reply, 20U);
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}
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void CNullController::writeAck(unsigned char type)
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{
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unsigned char reply[4U];
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reply[0U] = MMDVM_FRAME_START;
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reply[1U] = 4U;
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reply[2U] = MMDVM_ACK;
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reply[3U] = type;
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m_buffer.addData(reply, 4U);
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}
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