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//
// abi-ipc.cpp
// AmbientLight
//
// Created by Thorsten Kummermehr on 10/9/13.
//
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "abi-ipc.h"
using namespace K2L::Automotive::ABI;
using namespace K2L::Automotive::ABI_IPC;
AbiUsbIpc::AbiUsbIpc() : _isConnected( false ), _receiveThreadIsRunning( false ), _receiveCB( NULL ),
_receiveCBArgument( NULL ), _rxHandle( -1 ), _txHandle( -1 )
{
}
AbiUsbIpc::~AbiUsbIpc()
{
Disconnect();
}
bool AbiUsbIpc::Connect( const char *cdevRx, const char *cdevTx )
{
fprintf( stdout, "Connecting to RX:%s TX:%s\n", cdevRx, cdevTx );
bool success = -1 != ( _rxHandle = open( cdevRx, O_RDONLY ) );
if( success )
{
_isConnected = -1 != ( _txHandle = open( cdevTx, O_WRONLY ) );
}
if( !_isConnected )
{
if( -1 != _rxHandle )
{
close( _rxHandle );
_rxHandle = -1;
}
fprintf( stderr, "Failed to open cdev\n" );
return false;
}
if( pthread_create( &_receiveThread, NULL, ReceiveThread, this ) )
{
fprintf( stderr, "Failed to create receive thread\n" );
Disconnect();
return false;
}
return true;
}
bool AbiUsbIpc::Connect( const char *cdevRxTx )
{
fprintf( stdout, "Connecting to combined RX and TX:%s\n", cdevRxTx );
_isConnected = -1 != ( _rxHandle = _txHandle = open( cdevRxTx, O_RDWR ) );
if( !_isConnected )
{
fprintf( stderr, "Failed to open cdev\n" );
return false;
}
if( pthread_create( &_receiveThread, NULL, ReceiveThread, this ) )
{
fprintf( stderr, "Failed to create receive thread\n" );
Disconnect();
return false;
}
return true;
}
void AbiUsbIpc::Disconnect( void )
{
if( !_isConnected )
return;
_isConnected = false;
//Give the receive thread one second to shutdown
for( int i = 0; i < 100; i++ )
{
if( _receiveThreadIsRunning )
usleep( 10000 );
else
break;
}
if( 0 != _rxHandle )
{
close( _rxHandle );
_rxHandle = -1;
}
if( 0 != _txHandle )
{
close( _txHandle );
_txHandle = -1;
}
}
bool AbiUsbIpc::IsConnected()
{
return _isConnected;
}
int AbiUsbIpc::Send( const BYTE *data, DWORD length )
{
if( !_isConnected )
return 0;
return ( int )write( _txHandle, data, length );
}
void AbiUsbIpc::SetReceivePriority( int prio )
{
}
void AbiUsbIpc::SetReceiveCallback( AbiIpcDevice_RxCB_t receiveCB, void *cbArg )
{
if( NULL != _receiveCB )
{
fprintf( stderr,
"The actual implementaion of SetReceiveCallback supports only one listener. To be improved.\n" );
return;
}
_receiveCB = receiveCB;
_receiveCBArgument = cbArg;
}
void *AbiUsbIpc::ReceiveThread( void *param )
{
if( NULL == param )
{
fprintf( stderr,
"Receive thread could not be started, because the this pointer was not passed as argument\n" );
pthread_exit( 0 );
}
AbiUsbIpc *that = ( AbiUsbIpc * )param;
that->_receiveThreadIsRunning = true;
while( that->_isConnected )
{
ssize_t rc = read( that->_rxHandle, that->receiveBuffer, sizeof( that->receiveBuffer ) );
if( rc <= 0 )
{
//Receive error (<0) or other side closed connection (==0)
//fprintf( stdout, "Closing connection because read returned value %d\n", ( uint32_t )rc );
//if( that->_isConnected )
//{
// that->Disconnect();
//}
}
else
{
// "rc"-bytes received
if( NULL != that->_receiveCB )
{
that->_receiveCB( ( uint8_t * )&that->receiveBuffer, ( uint32_t )rc, that->_receiveCBArgument );
}
}
}
that->_receiveThreadIsRunning = false;
pthread_exit( 0 );
}
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