main.c

用于串口的输入输出调试

#include     <stdio.h>      /*标准输入输出定义*/
#include     <stdlib.h>     /*标准函数库定义*/
#include     <unistd.h>     /*Unix标准函数定义*/
#include     <sys/types.h>  /**/
#include     <sys/stat.h>   /**/
#include     <fcntl.h>      /*文件控制定义*/
#include     <termios.h>    /*PPSIX终端控制定义*/
#include     <errno.h>      /*错误号定义*/
#include     <string.h>
#define      FALSE -1
#define      TRUE  0
char buff[512];
int nread;
/***@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*/

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, };
void set_speed(int fd, int speed)
{
  int   i;
  int   status;
  struct termios   Opt;
  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 fd!");
     	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;
    options.c_cc[VTIME] = 8; // 
    options.c_cc[VMIN] = 0;

  tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
  if (tcsetattr(fd,TCSANOW,&options) != 0)
  	{
  		perror("SetupSerial 3");
		return (FALSE);
	}
  return (TRUE);
 }
/**
*@breif 打开串口
*/
int OpenDev(char *Dev)
{
int	fd = open( Dev, O_RDWR );         //| O_NOCTTY | O_NDELAY
	if (-1 == fd)
		{ /*设置数据位数*/
			perror("Can't Open Serial Port");
			return -1;
		}
	else
	return fd;

}

int sent_byt(int fd,char *buff){
	int result;
	result=write(fd,buff,nread);
	if(result<0){
		printf("Write command:%s  falied\n",buff);
		//close(fd);
		//exit(1);
		
	}
	
}

int send_cmd(int argc,char **argv){
	int fd,j=0;
	char *dev="/dev/ttyyS1";
	fd = OpenDev(dev);
	if(fd>0)
	set_speed(fd,1200);
	else{
		printf("Cant't open serial port!\n");
		exit(0);
	}
	if (set_Parity(fd,8,1,'e')== FALSE){
		printf("set parity error\n");
		exit(0);
	}
	
  write(fd,buff,nread);

 
   		while((nread = read(fd,buff,512))>0)
   		{	
   			  
      		
      		for(j=0;j<nread;j++)

         {
          printf("%x ",buff[j]);
          
         }
          printf("\n");
          //printf("\nLen %d\n",nread);
   			  //buff[nread]='\0'; 
                   
   	 	    
      }	
      	

}
	
	
/**
*@breif 	main()
*/
int main(int argc, char **argv)
{
	int fd,i=0;
	//int nread;
	char *dev ="/dev/ttyyS3";
	fd = OpenDev(dev);
	if (fd>0)
    set_speed(fd,1200);
	else
		{
		printf("Can't Open Serial Port!\n");
		exit(0);
		}
  if (set_Parity(fd,8,1,'e')== FALSE)
  {
    printf("Set Parity Error\n");
    exit(0);
  } 
     
  	while(1){ 
   		while((nread = read(fd,buff,512))>0)
   		{	
   	  
      		
      		for(i=0;i<nread;i++)

         {
            printf("%x ",buff[i]); 
                                 
         }
           printf("\n");              
          //printf("\nLen %d\n",nread);
          sent_byt(fd,buff);   
                 	   
          send_cmd(argc,argv);
      
          
          
   	 	    
      }	
      	
    } 
  	
}