ser.c

s3c2410的很多驱动实验

#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*/

#define      TRUE   1
#define      FALSE  0

/***@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[] = { 
	B921600, B576000, B500000, B460800, B230400, B115200, B57600,
	B38400,  B19200,  B9600,   B4800,   B2400,   B1200,   B300, 
	};

int name_arr[]  = {	
	921600, 576000, 500000, 460800, 230400, 115200, 57600,
	38400,  19200,  9600,   4800,   2400,   1200,   300, 
	};

void set_speed(int fd, int speed)
{
	int   i;
	int   status;
	struct termios  Opt;
	
	tcgetattr(fd, &Opt);	//获取串口结构体的属性
	
	for ( i= 0;  i < sizeof(speed_arr) / sizeof(int);  i++)
	{
		if  (speed == name_arr[i])
		{
			tcflush(fd, TCIOFLUSH);
			cfsetispeed(&Opt, speed_arr[i]);	//修改接收速率
			cfsetospeed(&Opt, speed_arr[i]);	//修改发送速率
			status = tcsetattr(fd, TCSANOW, &Opt);	//最终设置
			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;
	
	options.c_cflag &= ~CRTSCTS;	//无流控制
	options.c_cflag |= (CLOCAL|CREAD);
	
	options.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG);
	
	
	
	
	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)		//设置校验位
	{
		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);
	}
	
	switch (stopbits)	// 设置停止位
	{
		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] = 150; // 15 seconds
   	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);
}

int main(void)
{
	int fd;
	int nread;
	char buff[512];
		
	fd = open("/dev/ttyS1", O_RDWR|O_NOCTTY);	//打开串口0
	
	if (fd>0)		//设置串口波特率
    	set_speed(fd,115200);
	else
	{
		printf("Can't Open Serial Port!\n");
		exit(0);
	}
  	
	if (set_Parity(fd,8,1,'N')== FALSE )	//设置数据位,停止位,校验位
  	{
    		printf("Set Parity Error\n");
    		exit(1);
  	}
	
	printf("please enter any data to the ttyS0, Enter key to confirm\n");
	printf("Enter key to confirm\n");
		
	while(1)
	{
		printf("Enter key to confirm\n");
		while((nread = read(fd,buff,512))>0)
		{
			printf("\nLen %d\n",nread);
			buff[nread+1]='\0';
			printf("\n%s",buff);
		}
	}
  
	close(fd);
}