master.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

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 options;		//串口参数设置结构体
	tcgetattr(fd, &options);	//获取串口结构体的属性(当前端口的参数值)
	//for ( i= 0;  i < sizeof(speed_arr)/sizeof(int);  i++)
	for ( i= 0;  i < 14;  i++)	//挑出相应的宏变量
	{
		if (speed == name_arr[i])
		{
			tcflush(fd, TCIOFLUSH);
			cfsetispeed(&options, speed_arr[i]);		//修改接收速率
			cfsetospeed(&options, speed_arr[i]);		//修改发送速率
			status = tcsetattr(fd, TCSANOW, &options);	//设置立即生效
			if  (status != 0)
				perror("tcsetattr fd1");
			return;
		}
		tcflush(fd,TCIOFLUSH);
	}
}

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)		//设置校验位
	{
		case 'n':
		case 'N':
			options.c_cflag &= ~PARENB;	//不允许奇偶校验
			options.c_iflag &= ~INPCK;  //不允许接收奇偶校验
		break;
		case 'o':
		case 'O':
			options.c_cflag |= (PARODD | PARENB); // 设置为奇效验
			options.c_iflag |= INPCK;             //允许接收奇偶校验
		break;
		case 'e':
		case 'E':
			options.c_cflag |= PARENB;    //允许奇偶校验
			options.c_cflag &= ~PARODD;   //不允许偶校验
			options.c_iflag |= INPCK;     //允许接收奇偶校验
		break;
		case 'S':
		case 's':
			options.c_cflag &= ~PARENB;		//不允许奇偶校验
			options.c_cflag &= ~CSTOPB;		//1位停止位
		break;
		default:
			fprintf(stderr,"Unsupported parity\n");
			return (FALSE);
	}
	
	switch (stopbits)	// 设置停止位
	{
		case 1:
			options.c_cflag &= ~CSTOPB;	//1位停止位
		break;
		case 2:
			options.c_cflag |= CSTOPB;	//2位停止位
		break;
		default:
			fprintf(stderr,"Unsupported stop bits\n");
			return (FALSE);
	}

	/*设置串口波特率*/
	//cfsetispeed(&options, B115200);	//修改接收速率
	//cfsetospeed(&options, B115200);	//修改发送速率
		
	/*设置数据位,停止位,校验位*/
	//options.c_cflag &= ~CSIZE;	//控制模式,屏蔽字符大小位
	//options.c_cflag |= CS8;		//设置8位数据位数
	//options.c_cflag &= ~CSTOPB;	//1位停止位
	//options.c_cflag &= ~PARENB;	//无奇偶校验位
	
	/*其它设置*/
	options.c_cflag |= (CLOCAL|CREAD);		//使能接收,并设置本地状态
	options.c_cflag &= ~CRTSCTS;			//无流控制
	
	/*对接收数据的设置*/
	options.c_iflag &= ~ICRNL;	//CR不转换为NL
	options.c_iflag &= ~INLCR;	//NL不转换为CR
	
	/*对发送数据的设置*/
	options.c_oflag &= ~OPOST;  /*选择原始输出法*/
	options.c_oflag &= ~OCRNL;	//CR不转换为NL
	options.c_oflag &= ~ONLCR;	//NL不转换为CR
	
	/*线控制的设置*/
	options.c_lflag &= ~ECHO;		//不回显
	options.c_lflag &= ~ECHONL;		//不回显换行
	options.c_lflag &= ~ISIG;		//不
	options.c_lflag &= ~(ICANON | ECHOE | ECHOK);    /*选择原始输入法*/
	
	/*控制字符的设置*/	
	options.c_cc[VTIME] = 150; 	// 等待数据的时间:15 seconds
   	options.c_cc[VMIN] = 1;		// 将要读字符的最小数目
	
	tcflush(fd,TCIOFLUSH); 				//更新参数并立即生效
	if (tcsetattr(fd,TCSANOW,&options) != 0)
  	{
  		perror("SetupSerial 3");
		return (FALSE);
	}
  	return (TRUE);
}


int main(void)
{
	int i;
	int fd;
	int nread;
	char buff_r[512];
	char buff_w[512];
	int len;
	
	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 ttyS1\n");
	printf("Enter key to confirm\n");
	
	
	if(strcmp("asdff","asdff") == 0)
	{
		printf("equal! \n");
	}
	
	for(i=0;i<15;i++)
		buff_w[i] = i+1;
	while(1)
	{
		printf("\n1111\n");
		tcflush(fd,TCIOFLUSH); 			//清理输入输出缓存
		getchar();
		write(fd,buff_w,15);
		printf("2222\n");
		
		len = 0; 
		while( (nread = read(fd,buff_r,15))>0)
		{
			printf("\nLen %d\n",nread);
			printf("receive data are:\n");
			for(i=0;i<nread;i++)
				printf(" %d",buff_r[i]);
			printf("\n");
			len += nread;
			printf(" num is %d\n",len);
			if(len==15) break;
		}
	}
	close(fd);
}