pos機linux下的對應程序

#include     <stdio.h>      /*標準輸入輸出定義*/  
#include 	 <string.h>
#include     <stdlib.h>     /*標準函數庫定義*/  
#include     <unistd.h>     /*Unix標準函數定義*/  
#include     <sys/types.h>  /**/  
#include     <sys/stat.h>   /**/  
#include     <fcntl.h>      /*文件控制定義*/  
#include     <termios.h>    /*PPSIX終端控制定義*/  
#include     <errno.h>      /*錯誤號定義*/  

/***@brief  設置串口通信速率 
 *@param  fd     類型 int  打開串口的文件句柄 
 *@param  speed  類型 int  串口速度 
 *@return  void*/  
#ifndef SI  
#define SI      0xf  
#endif  

#ifndef SO  
#define SO      0xe  
#endif  

#ifndef STX  
#define STX     0x02  
#endif  

#ifndef ETX  
#define ETX     0x03  
#endif 



int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,  
	B38400, B19200, B9600, B4800, B2400, B1200, B300,B115200 };  
int name_arr[] = {38400,  19200,  9600,  4800,  2400,  1200,  300,  
	38400,  19200,  9600, 4800, 2400, 1200,  300, 115200};  
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 fd1");  
			return;  
		}  
		tcflush(fd,TCIOFLUSH);  
	}  
}  
/** 
 *@brief   設置串口數據位，停止位和效驗位 
 *@param  fd     類型  int  打開的串口文件句柄* 
 *@param  databits 類型  int 數據位   取值 爲 7 或者8* 
 *@param  stopbits 類型  int 停止位   取值爲 1 或者2* 
 *@param  parity  類型  int  效驗類型 取值爲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(1);  
	}  
	options.c_cflag &= ~CSIZE;  
	switch (databits) /*設置數據位數*/  
	{  
		case 7:  
			options.c_cflag |= CS7;  
			break;  
		case 8:  
			options.c_cflag |= CS8;  
			break;  
		default:  
			fprintf(stderr,"Unsupported data size\n");  
			return (1);  
	}  
	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);  /* 設置爲奇效驗*/   
			options.c_iflag |= INPCK;             /* Disnable parity checking */  
			break;  
		case 'e':  
		case 'E':  
			options.c_cflag |= PARENB;     /* Enable parity */  
			options.c_cflag &= ~PARODD;   /* 轉換爲偶效驗*/    
			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 (1);  
	}  
	/* 設置停止位*/     
	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;  
	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 (1);  
	}  
	return (0);  
}  
/** 
 *@breif 打開串口 
 */  
int OpenDev(char *Dev)  
{  
	int fd = open( Dev, O_RDWR );         //| O_NOCTTY | O_NDELAY  
	if (-1 == fd)  
	{ /*設置數據位數*/  
		perror("Can't Open Serial Port");  
		return -1;  
	}  
	else  
		return fd;  

}  
/** 
 *@breif     main() 
 */  

int Rec232HostPacket(char *packet,int RS232DEV)  
{  
	int len, resp, k, delay_times = 100;  
	long i, j;  

	char buf[6];  

	j = 10 * 50L;  
	i = 0L;  

	// while(1)  
	{  

		do  
		{  
			resp = read(RS232DEV, buf, 1);  

			if(resp == 0){  
				continue;  
			}  
			else if(resp == 1)  
				break;  
		}  
		while((!(buf[0] == STX && resp == 1)));  

		if(buf[0] != STX || resp != 1)  
		{  
			return(-1);  
		}  

		k = 0;  

		do  
		{  
			resp = read(RS232DEV, &buf[1 + k], 2 - k);  
			k += resp;  
		}  
		while((k < 2) && i++ < j);  

		len = ((buf[1] & 0xf0) >> 4) * 1000 + (buf[1] & 0x0f) * 100  
			+ ((buf[2] & 0xf0) >> 4) * 10 + (buf[2] & 0x0f);  

		if(k != 2 || len >1000)  
		{  
			return(-1);  
		}  

		k = 0;  

		do  
		{  
			resp = read(RS232DEV, packet + k, len - k);  
			k += resp;  

		}  
		while((k < len));  

		if(k != len)  
		{  
			return(-1);  
		}  

		k = 0;  

		do  
		{  
			resp = read(RS232DEV, &buf[3 + k], 2 - k);  
			k += resp;  
		}  
		while((k < 2));  

		if(k != 2)  
		{  
			return(-1);  
		}  

		if(buf[3] != ETX)  
		{  
			return(-1);  
		}  

		buf[5] = ETX;  

		for(resp = 0; resp < len; resp ++)  
			buf[5] ^= packet[resp];  

		buf[5] ^= buf[1];  
		buf[5] ^= buf[2];  

		if(buf[5] != buf[4])  
		{  
			return(-1);  
		}  

		//   if(packet[0] != 0x68)  
		// break;  
	}  

	return(len);  
}  






int Send232PosPacket(char *packet, int  len,int RS232DEV)  
{  
	char buf[6];  
	int i;  
	//	printf("aaa\n");
	//	while(read(RS232DEV, buf, 6) > 0) ;  
	//	printf("aaa\n");

	buf[0] = STX;  
	buf[1] = (unsigned char)(((((len / 1000) % 10) << 4) & 0xf0) | (((len / 100) % 10) & 0x0f));  
	buf[2] = (unsigned char)(((((len / 10) % 10) << 4) & 0xf0) | ((len % 10) & 0x0f));  
	buf[3] = ETX;  
	buf[4] = ETX;  
	buf[5] = '\r';  

	for(i = 0; i < len; i++)  
		buf[4] ^= packet[i];  

	buf[4] ^= buf[1];  
	buf[4] ^= buf[2];  

	if(write(RS232DEV, buf, 3) != 3) return(-1);  

	if(write(RS232DEV, packet, len) != len) return(-1);  

	if(write(RS232DEV, buf + 3, 2) != 2) return(-1);  

	return(len);  
}  



int main(int argc, char **argv)  
{  
	int fd;  
	int nread;  
	char buff[512];  
	char *dev ="/dev/ttyUSB0";  
	fd = OpenDev(dev);  
	if (fd>0)  
		set_speed(fd,115200);  
	else  
	{  
		printf("Can't Open Serial Port!\n");  
		exit(0);  
	}  
	if (set_Parity(fd,8,1,'N')== 1)  
	{  
		printf("Set Parity Error\n");  
		exit(1);  
	}  
	while(1)  
	{  
		//	while((nread = read(fd,buff,512))>0)  
		//	{  
		//		printf("\nLen %d\n",nread);  
		//		buff[nread+1]='\0';  
		//		printf("\n%s",buff);  
		//	}

		//		Rec232HostPacket(buff,fd);
		//		printf("%s\n",buff);
		printf("請輸入要發送的數據\n");
		memset(buff,0,sizeof(buff));
		scanf("%s",buff);
		Send232PosPacket(buff,strlen(buff),fd);
	}  
	close(fd);  
	exit(0);  
}