MMDVMHost-Private/UMP.cpp

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/*
* Copyright (C) 2016 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 "Defines.h"
#include "Utils.h"
#include "Log.h"
#include "UMP.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned char UMP_FRAME_START = 0xF0U;
const unsigned char UMP_HELLO = 0x00U;
const unsigned char UMP_SET_MODE = 0x01U;
const unsigned char UMP_SET_TX = 0x02U;
const unsigned char UMP_SET_CD = 0x03U;
const unsigned char UMP_WRITE_SERIAL = 0x10U;
const unsigned char UMP_READ_SERIAL = 0x11U;
const unsigned char UMP_STATUS = 0x50U;
const unsigned int BUFFER_LENGTH = 255U;
CUMP::CUMP(const std::string& port) :
m_serial(port, SERIAL_115200),
m_open(false),
m_buffer(NULL),
m_length(0U),
m_offset(0U),
m_lockout(false),
m_mode(MODE_IDLE),
m_tx(false),
m_cd(false)
{
m_buffer = new unsigned char[BUFFER_LENGTH];
}
CUMP::~CUMP()
{
delete[] m_buffer;
}
bool CUMP::open()
{
if (m_open)
return true;
LogMessage("Opening the UMP");
bool ret = m_serial.open();
if (!ret)
return false;
unsigned char buffer[3U];
buffer[0U] = UMP_FRAME_START;
buffer[1U] = 3U;
buffer[2U] = UMP_HELLO;
// CUtils::dump(1U, "Transmitted", buffer, 3U);
int n = m_serial.write(buffer, 3U);
if (n != 3) {
m_serial.close();
return false;
}
m_open = true;
return true;
}
bool CUMP::setMode(unsigned char mode)
{
if (mode == m_mode)
return true;
m_mode = mode;
unsigned char buffer[4U];
buffer[0U] = UMP_FRAME_START;
buffer[1U] = 4U;
buffer[2U] = UMP_SET_MODE;
buffer[3U] = mode;
// CUtils::dump(1U, "Transmitted", buffer, 4U);
return m_serial.write(buffer, 4U) == 4;
}
bool CUMP::setTX(bool on)
{
if (on == m_tx)
return true;
m_tx = on;
unsigned char buffer[4U];
buffer[0U] = UMP_FRAME_START;
buffer[1U] = 4U;
buffer[2U] = UMP_SET_TX;
buffer[3U] = on ? 0x01U : 0x00U;
// CUtils::dump(1U, "Transmitted", buffer, 4U);
return m_serial.write(buffer, 4U) == 4;
}
bool CUMP::setCD(bool on)
{
if (on == m_cd)
return true;
m_cd = on;
unsigned char buffer[4U];
buffer[0U] = UMP_FRAME_START;
buffer[1U] = 4U;
buffer[2U] = UMP_SET_CD;
buffer[3U] = on ? 0x01U : 0x00U;
// CUtils::dump(1U, "Transmitted", buffer, 4U);
return m_serial.write(buffer, 4U) == 4;
}
bool CUMP::getLockout() const
{
return m_lockout;
}
int CUMP::write(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
unsigned char buffer[250U];
buffer[0U] = UMP_FRAME_START;
buffer[1U] = length + 3U;
buffer[2U] = UMP_WRITE_SERIAL;
::memcpy(buffer + 3U, data, length);
// CUtils::dump(1U, "Transmitted", buffer, length + 3U);
return m_serial.write(buffer, length + 3U);
}
// To be implemented later if needed
int CUMP::read(unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
return 0;
}
void CUMP::clock(unsigned int ms)
{
if (m_offset == 0U) {
// Get the start of the frame or nothing at all
int ret = m_serial.read(m_buffer + 0U, 1U);
if (ret < 0) {
LogError("Error when reading from the UMP");
return;
}
if (ret == 0)
return;
if (m_buffer[0U] != UMP_FRAME_START)
return;
m_offset = 1U;
}
if (m_offset == 1U) {
// Get the length of the frame
int ret = m_serial.read(m_buffer + 1U, 1U);
if (ret < 0) {
LogError("Error when reading from the UMP");
m_offset = 0U;
return;
}
if (ret == 0)
return;
if (m_buffer[1U] >= 250U) {
LogError("Invalid length received from the UMP - %u", m_buffer[1U]);
m_offset = 0U;
return;
}
m_length = m_buffer[1U];
m_offset = 2U;
}
if (m_offset == 2U) {
// Get the frame type
int ret = m_serial.read(m_buffer + 2U, 1U);
if (ret < 0) {
LogError("Error when reading from the UMP");
m_offset = 0U;
return;
}
if (ret == 0)
return;
switch (m_buffer[2U]) {
case UMP_STATUS:
case UMP_READ_SERIAL:
break;
default:
LogError("Unknown message, type: %02X", m_buffer[2U]);
m_offset = 0U;
return;
}
m_offset = 3U;
}
if (m_offset >= 3U) {
while (m_offset < m_length) {
int ret = m_serial.read(m_buffer + m_offset, m_length - m_offset);
if (ret < 0) {
LogError("Error when reading from the UMP");
m_offset = 0U;
return;
}
if (ret == 0)
return;
if (ret > 0)
m_offset += ret;
}
}
m_offset = 0U;
// CUtils::dump(1U, "Received", m_buffer, m_length);
if (m_buffer[2U] == UMP_STATUS)
m_lockout = (m_buffer[3U] & 0x01U) == 0x01U;
}
void CUMP::close()
{
if (!m_open)
return;
LogMessage("Closing the UMP");
m_serial.close();
m_open = false;
}