uart.c

3G modem AT 命令测试代码

#include <stdio.h>
#include <termios.h>    
#include <fcntl.h>     
#include <errno.h>      
#include "uart.h"

#define SPEED_NUM	14
int speed_arr[SPEED_NUM] = {B115200, B19200, B9600, B4800, B2400, B1200,B300, B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[SPEED_NUM] = {115200,  19200,  9600,  4800,  2400,  1200, 300, 38400, 19200,  9600, 4800, 2400, 1200,  300, };


void set_speed(int fd, int speed)
{
	int   i; 
	int   status; 
	struct termios   Opt;
	tcgetattr(fd, &Opt); 	
	for ( i= 0;  i < SPEED_NUM;  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) 		
			{        
//				printf("tcsetattr fd1 error\n");  
				return;     
			}    
			tcflush(fd,TCIOFLUSH);   
		}  
	}
}


int set_Parity(int fd,int databits,int stopbits,int parity)
{ 
	struct termios options; 
	if  ( tcgetattr( fd,&options)  !=  0) 
		return(-1);  
	options.c_cflag &= ~CSIZE; 
	options.c_lflag &= ~ECHO; 
	switch (databits) 
	{   
		case 7:		
			options.c_cflag |= CS7; 
			break;
		case 8:     
			options.c_cflag |= CS8;
			break;   
		default:  
			break;  
	}
	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); 
			options.c_iflag |= INPCK;             /* Disnable parity checking */ 
			break;  
		case 'e':  
		case 'E':   
			options.c_cflag |= PARENB;     /* Enable parity */    
			options.c_cflag &= ~PARODD;      
			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:   
			return (-1);  
	}  
	/* 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 (-1); 
	} 
	/* Set input parity option */ 
	if (parity != 'n')   
		options.c_iflag |= INPCK; 
	
	//============= add new=======================
	options.c_cflag |= CLOCAL | CREAD;
	options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
	options.c_oflag &= ~OPOST; /*Output*/
	options.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
	//============= add new=======================
	
	tcflush(fd,TCIFLUSH);
	options.c_cc[VTIME] = 100;
	options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
	if (tcsetattr(fd,TCSANOW,&options) != 0)   
		return (-1);  
	return (0);  
}