MMDVMHost-Private/NullController.cpp
2021-03-14 21:00:47 +00:00

184 lines
3.7 KiB
C++

/*
* Copyright (C) 2021 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "NullController.h"
#include <cstdio>
#include <cassert>
const unsigned char MMDVM_FRAME_START = 0xE0U;
const unsigned char MMDVM_GET_VERSION = 0x00U;
const unsigned char MMDVM_GET_STATUS = 0x01U;
const unsigned char MMDVM_SET_CONFIG = 0x02U;
const unsigned char MMDVM_SET_MODE = 0x03U;
const unsigned char MMDVM_SET_FREQ = 0x04U;
const unsigned char MMDVM_FM_PARAMS1 = 0x60U;
const unsigned char MMDVM_FM_PARAMS2 = 0x61U;
const unsigned char MMDVM_FM_PARAMS3 = 0x62U;
const unsigned char MMDVM_FM_PARAMS4 = 0x63U;
const unsigned char MMDVM_ACK = 0x70U;
const unsigned char MMDVM_NAK = 0x7FU;
const unsigned char PROTOCOL_VERSION = 2U;
const char* HARDWARE = "Null Modem Controller";
CNullController::CNullController() :
m_buffer(200U, "Null Controller Buffer")
{
}
CNullController::~CNullController()
{
}
bool CNullController::open()
{
return true;
}
int CNullController::read(unsigned char* buffer, unsigned int length)
{
unsigned int dataSize = m_buffer.dataSize();
if (dataSize == 0U)
return 0;
if (length > dataSize)
length = dataSize;
m_buffer.getData(buffer, length);
return int(length);
}
int CNullController::write(const unsigned char* buffer, unsigned int length)
{
switch (buffer[2U]) {
case MMDVM_GET_VERSION:
writeVersion();
break;
case MMDVM_GET_STATUS:
writeStatus();
break;
case MMDVM_SET_CONFIG:
case MMDVM_SET_FREQ:
case MMDVM_SET_MODE:
case MMDVM_FM_PARAMS1:
case MMDVM_FM_PARAMS2:
case MMDVM_FM_PARAMS3:
case MMDVM_FM_PARAMS4:
writeAck(buffer[2U]);
break;
default:
break;
}
return int(length);
}
void CNullController::close()
{
}
void CNullController::writeVersion()
{
unsigned char reply[200U];
reply[0U] = MMDVM_FRAME_START;
reply[1U] = 0U;
reply[2U] = MMDVM_GET_VERSION;
reply[3U] = PROTOCOL_VERSION;
// Return two bytes of mode capabilities
reply[4U] = 0xFFU;
reply[5U] = 0xFFU;
// CPU type/manufacturer. 0=Atmel ARM, 1=NXP ARM, 2=St-Micro ARM
reply[6U] = 2U;
// Reserve 16 bytes for the UDID
::memset(reply + 7U, 0x00U, 16U);
uint8_t count = 23U;
for (uint8_t i = 0U; HARDWARE[i] != 0x00U; i++, count++)
reply[count] = HARDWARE[i];
reply[1U] = count;
m_buffer.addData(reply, count);
}
void CNullController::writeStatus()
{
unsigned char reply[30U];
// Send all sorts of interesting internal values
reply[0U] = MMDVM_FRAME_START;
reply[1U] = 20U;
reply[2U] = MMDVM_GET_STATUS;
reply[3U] = 0U;
reply[4U] = 0x00U;
reply[5U] = 0x00U;
reply[6U] = 20U;
reply[7U] = 20U;
reply[8U] = 20U;
reply[9U] = 20U;
reply[10U] = 20U;
reply[11U] = 20U;
reply[12U] = 20U;
reply[13U] = 20U;
reply[14U] = 0x00U;
reply[15U] = 0x00U;
reply[16U] = 20U;
reply[17U] = 20U;
reply[18U] = 0x00U;
reply[19U] = 0x00U;
m_buffer.addData(reply, 20U);
}
void CNullController::writeAck(unsigned char type)
{
unsigned char reply[4U];
reply[0U] = MMDVM_FRAME_START;
reply[1U] = 4U;
reply[2U] = MMDVM_ACK;
reply[3U] = type;
m_buffer.addData(reply, 4U);
}