www.pudn.com > LiSerialPort.rar > SerialPort.c

#include           /*标准输入输出定义*/

#include           /*文件控制定义*/
#include         /*PPSIX 终端控制定义*/
#include           /*错误号定义*/


#include    "serialPort.h"

/**
*@brief  设置串口通信速率
*@param  fd     类型 int  打开串口的文件句柄
*@param  speed  类型 int  串口速度
*@return  void
*/


void set_speed(int fd, int speed)
{
	int   i; 
	int   status; 
	struct termios   Opt;
	
	int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
		B38400, B19200, B9600, B4800, B2400, B1200, B300, };
	int name_arr[] = {38400,  19200,  9600,  4800,  2400,  1200,  300, 38400,  
			19200,  9600, 4800, 2400, 1200,  300, };
			
	tcgetattr(fd, &Opt); 
	for ( i= 0;  i < sizeof(speed_arr) / sizeof(int);  i++) { 
		if  (speed == name_arr[i]) {     
			tcflush(fd, TCIOFLUSH);     
			cfsetispeed(&Opt, speed_arr[i]);  
			cfsetospeed(&Opt, speed_arr[i]);   
			status = tcsetattr(fd, TCSANOW, &Opt);  
			if  (status != 0) {        
				perror("tcsetattr fd1");  
				return;     
			}    
			tcflush(fd,TCIOFLUSH);   
		}  
	}
}

/**
*@brief   设置串口数据位，停止位和效验位
*@param  fd     类型  int  打开的串口文件句柄
*@param  databits 类型  int 数据位   取值 为 7 或者8
*@param  stopbits 类型  int 停止位   取值为 1 或者2
*@param  parity  类型  int  效验类型 取值为N,E,O,,S
*/
int set_Parity(int fd,int databits,int stopbits,int parity)
{ 
	struct termios options; 
	if  ( tcgetattr( fd,&options)  !=  0) { 
		perror("SetupSerial 1");     
		return(FALSE);  
	}
	
	options.c_cflag &= ~CSIZE; 
	switch (databits) /*设置数据位数*/
	{   
	case 7:		
		options.c_cflag |= CS7; 
		break;
	case 8:     
		options.c_cflag |= CS8;
		break;   
	default:    
		fprintf(stderr,"Unsupported data size\n"); return (FALSE);  
	}

	switch (parity) 
	{   
	case 'n':
	case 'N':    
		options.c_cflag &= ~PARENB;   /* Clear parity enable */
		options.c_iflag &= ~INPCK;     /* Enable parity checking */ 
		break;  
	case 'o':   
	case 'O':     
		options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/  
		options.c_iflag |= INPCK;             /* Disnable parity checking */ 
		break;  
	case 'e':  
	case 'E':   
		options.c_cflag |= PARENB;     /* Enable parity */    
		options.c_cflag &= ~PARODD;   /* 转换为偶效验*/     
		options.c_iflag |= INPCK;       /* Disnable parity checking */
		break;
	case 'S': 
	case 's':  /*as no parity*/   
	    options.c_cflag &= ~PARENB;
		options.c_cflag &= ~CSTOPB;break;  
	default:   
		fprintf(stderr,"Unsupported parity\n");    
		return (FALSE);  
	}  

	// 设置停止位
	switch (stopbits)
	{   
	case 1:    
		options.c_cflag &= ~CSTOPB;  
		break;  
	case 2:    
		options.c_cflag |= CSTOPB;  
	   break;
	default:    
		 fprintf(stderr,"Unsupported stop bits\n");  
		 return (FALSE); 
} 
	
	// Set input parity option 
	if (parity != 'n')   
		options.c_iflag |= INPCK; 

	//raw 
	//options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  /*Input*/
	//options.c_oflag  &= ~OPOST;   /*Output*/

	tcflush(fd,TCIFLUSH);
	options.c_cc[VTIME] = 150; /* 设置超时15 seconds*/   
	options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
	
	if (tcsetattr(fd,TCSANOW,&options) != 0)   
	{ 
		perror("SetupSerial 3");   
		return (FALSE);  
	} 

	return (TRUE);  
}


/**
*@brief   打开指定串口
*@param  Dev  类型 char * 打开串口设备文件名, 为/dev/ttyS*
*/

int OpenDev(char *Dev)
{
	int	fd = open( Dev, O_RDWR ); 
        //| O_NOCTTY | O_NDELAY	
	if (-1 == fd)	
	{ 			
		perror("Can't Open Serial Port");
		return -1;		
	}	
	else	
		return fd;
}