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#include <stdio.h>
#include <windows.h>
#include <glib.h>
#include "serial_io.h"
#include "debug.h"
//***************************************************************************
/** @fn int serial_io_init( const char* port, const char* strsettings )
*****************************************************************************
* @b Description: initialise a serial port communication
*****************************************************************************
* @param port : port name
* example 'COM7'
* @param strsettings : port settings
* example ; 'baud=115200 parity=N data=8 stop=1'
*****************************************************************************
* @return file descriptor
* -1 if error
*****************************************************************************
**/
int serial_io_init( const char* port, const char* strsettings )
{
HANDLE hCom = NULL;
DCB dcb;
COMMTIMEOUTS sCT;
char strport[16];
g_snprintf( strport, sizeof( strport ), "\\\\.\\%s", port );
hCom = CreateFile(
strport,
GENERIC_WRITE | GENERIC_READ,
0,
0,
OPEN_EXISTING,
0,
NULL);
if (hCom == INVALID_HANDLE_VALUE)
{
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
dbg(lvl_warning, "return (fd) : '-1' : serial_io_init error : '%s'", lpMsgBuf);
LocalFree( lpMsgBuf ); // Free the buffer.
return -1;
}
ZeroMemory(&dcb, sizeof(DCB));
GetCommState(hCom, &dcb);
BuildCommDCB( strsettings, &dcb);
SetupComm(hCom, 4096, 4096);
SetCommState(hCom, &dcb);
memset(&sCT, 0, sizeof(sCT));
sCT.ReadTotalTimeoutConstant = 10;
SetCommTimeouts(hCom, &sCT);
dbg(lvl_debug, "serial_io_init return (fd) : '%d'", (int)hCom);
return (int)hCom;
}
//***************************************************************************
/** @fn int serial_io_read( int fd, char * buffer, int buffer_size )
*****************************************************************************
* @b Description: Read bytes on the serial port
*****************************************************************************
* @param fd : file descriptor
* @param buffer : buffer for data
* @param buffer_size : size in byte of the buffer
*****************************************************************************
* @return number of bytes read
*****************************************************************************
* @remarks buffer must be allocated by the caller
*****************************************************************************
**/
int serial_io_read( int fd, char * buffer, int buffer_size )
{
DWORD dwBytesIn = 0;
dbg(lvl_debug, "serial_io_read fd = %d buffer_size = %d", fd, buffer_size);
if (fd <= 0)
{
dbg(lvl_debug, "serial_io_read return (dwBytesIn) : '0'");
*buffer = 0;
return 0;
}
ReadFile( (HANDLE)fd, buffer, buffer_size - 1, &dwBytesIn, NULL);
if (dwBytesIn >= 0)
{
buffer[dwBytesIn] = 0;
}
else
{
dwBytesIn = 0;
buffer[0] = 0;
}
if (dwBytesIn > 0)
{
dbg(lvl_debug,"GPS < %s",buffer );
}
buffer[buffer_size - 1] = 0;
dbg(lvl_info, "serial_io_read return (dwBytesIn) : '%d'", dwBytesIn);
return dwBytesIn;
}
//***************************************************************************
/** @fn int serial_io_write(int fd, const char * buffer)
*****************************************************************************
* @b Description: Write bytes on the serial port
*****************************************************************************
* @param fd : file descriptor
* @param buffer : data buffer (null terminated)
*****************************************************************************
* @return number of bytes written
*****************************************************************************
**/
int serial_io_write(int fd, const char * buffer)
{
DWORD dwBytesOut = 0;
dbg(lvl_debug, "serial_io_write fd = %d buffer = '%s'",fd, buffer);
WriteFile((HANDLE)fd, buffer, strlen(buffer), &dwBytesOut, NULL);
return dwBytesOut;
}
//***************************************************************************
/** @fn void serial_io_shutdown(int fd )
*****************************************************************************
* @b Description: Terminate serial communication
*****************************************************************************
* @param fd : file descriptor
*****************************************************************************
**/
void serial_io_shutdown(int fd )
{
dbg(lvl_debug, "serial_io_shutdown fd = %d",fd);
if (fd > 0)
{
CloseHandle((HANDLE)fd);
}
}
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