csu3_am335x/EVSE/GPL/plc-utils.LNX.2.1.20/source/serial/openport.c

/*====================================================================*
*
*   Copyright (c) 2013 Qualcomm Atheros, Inc.
*
*   All rights reserved.
*
*====================================================================*/

/*====================================================================*
 *
 *   void openport (struct _file_ * port, flag_t flags);
 *
 *   open the serial port named by port->name and set file descriptor
 *   port->file; datatype struct _file_ is define in tools/types.h;
 *
 *   this function no longer initializes port settings because there
 *   are too many differences in constants, variables and functions 
 *   between Linux, OpenBSD, MacOSX and Windows to cleanly implement
 *   a single approach to serial port configuration; this means that
 *   users should manually configure a port and then leave it alone;
 *
 *   use stty on Linux systems and the Control Panel on Windows;
 *
 *   port configuration code for Linux and Windows can be enabled if
 *   needed by defining SERIAL_CONFIG at compile time; this will not
 *   restore original port setting when the port is closed;
 *
 *   Contributor(s):
 *	Charles Maier <cmaier@qca.qualcomm.com>
 *	Mathieu Olivari <mathieu@qca.qualcomm.com>
 *
 *--------------------------------------------------------------------*/

#ifndef OPENPORT_SOURCE
#define OPENPORT_SOURCE

#include <unistd.h>
#include <stdlib.h>
#include <errno.h>

#if defined (WIN32)
#	include <windows.h>
#elif defined (__linux__)
#	include <termios.h>
#elif defined (__APPLE__)
#	include <termios.h>
#	include <net/ethernet.h>
#elif defined (__OpenBSD__)
#	include <termios.h>
#else
#error "Unknown Environment"
#endif

#include "../tools/types.h"
#include "../tools/files.h"
#include "../tools/flags.h"
#include "../tools/error.h"
#include "../serial/serial.h"

void openport (struct _file_ * port, flag_t flags) 

{ 

#if defined (WIN32)

	HANDLE hSerial; 
	COMMTIMEOUTS timeouts; 
	hSerial = CreateFile (port->name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); 
	if (hSerial == INVALID_HANDLE_VALUE) 
	{ 
		error (1, errno, "%s", port->name); 
	} 
	if (_anyset (flags, UART_DEFAULT)) 
	{ 
		DCB dcbSerial = 
		{ 
			0
		}; 
		dcbSerial.DCBlength = sizeof (dcbSerial); 
		if (! GetCommState (hSerial, & dcbSerial)) 
		{ 
			error (1, errno, "Can't read state: %s", port->name); 
		} 
		if (_anyset (flags, UART_VERBOSE)) 
		{ 
			printf ("getting %s ", port->name); 
			printf ("Baud %6d ", dcbSerial.BaudRate); 
			printf ("Data %d ", dcbSerial.ByteSize); 
			printf ("Stop %d ", dcbSerial.StopBits); 
			printf ("Parity %d\n", dcbSerial.Parity); 
		} 
		dcbSerial.BaudRate = CBR_115200; 
		dcbSerial.ByteSize = DATABITS_8; 
		dcbSerial.StopBits = ONESTOPBIT; 
		dcbSerial.Parity = NOPARITY; 
		if (_anyset (flags, UART_VERBOSE)) 
		{ 
			printf ("setting %s ", port->name); 
			printf ("Baud %6d ", dcbSerial.BaudRate); 
			printf ("Data %d ", dcbSerial.ByteSize); 
			printf ("Stop %d ", dcbSerial.StopBits); 
			printf ("Parity %d\n", dcbSerial.Parity); 
		} 
		if (! SetCommState (hSerial, & dcbSerial)) 
		{ 
			error (1, errno, "Can't save state: %s", port->name); 
		} 
	} 
	timeouts.ReadIntervalTimeout = 10; 
	timeouts.ReadTotalTimeoutConstant = 50; 
	timeouts.ReadTotalTimeoutMultiplier = 10; 
	timeouts.WriteTotalTimeoutConstant = 50; 
	timeouts.WriteTotalTimeoutMultiplier = 10; 
	if (! SetCommTimeouts (hSerial, & timeouts)) 
	{ 
		error (1, errno, "Can't set timeouts: %s", port->name); 
	} 
	CloseHandle (hSerial); 
	if ((port->file = open (port->name, O_BINARY | O_RDWR)) == - 1) 
	{ 
		error (1, errno, "%s", port->name); 
	} 

#else

	if ((port->file = open (port->name, O_BINARY | O_RDWR)) == - 1) 
	{ 
		error (1, errno, "%s", port->name); 
	} 
	if (_anyset (flags, UART_DEFAULT)) 
	{ 
		struct termios termios; 

#if 1

/*
 *	POSIX generic code;
 */

		tcgetattr (port->file, & termios); 
		cfmakeraw (& termios); 
		termios.c_cflag |= CS8; 
		termios.c_cflag &= ~ (CSTOPB); 
		cfsetospeed (& termios, B115200); 

#else

/*
 *	Linux specific code;
 */

		termios.c_cflag = B115200 | CS8 | CLOCAL | CREAD; 
		termios.c_iflag = IGNPAR; 
		termios.c_oflag = 0; 
		termios.c_lflag = 0; 
		termios.c_cc [VTIME] = 0; 
		termios.c_cc [VMIN] = 5; 

#endif

		tcsetattr (port->file, TCSANOW, & termios); 
	} 

#endif

	return; 
} 

#endif