UNIX下串口通讯程序问题。
要求com1发送数据,比如“123456789”com2接收数据。
我写的怎么都收不通。大家快帮帮我看看把。我把发送和接收分开写了。
发送函数:
#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*/
int OpenDev(char *Dev)
{
int fd = open( Dev, O_RDWR ); //| O_NOCTTY | O_NDELAY
if (-1 == fd)
{
perror("Can't Open Serial Port");
return -1;
}
else
return fd;
}
/**
*@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]) {
printf("baud is %d\n",name_arr[i]);
tcflush(fd, TCIOFLUSH);
if(cfsetispeed(&Opt, speed_arr[i])==0)
{
printf("baud set is ok.\n");
}
/* if(cfsetospeed(&Opt, speed_arr[i])==0)
{
printf("baud set is ok.\n");
}*/
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:
printf("data bit is 8.\n");
options.c_cflag |= CS8;
break;
default:
fprintf(stderr,"Unsupported data size\n"); return (FALSE);
}
switch (parity)
{
case 'n':
case 'N':
printf("parity is 'N'.\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:
printf("stop bit is 1.\n");
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;
tcflush(fd,TCIFLUSH);
options.c_cc[VTIME] = 150; /* 设置超时15 seconds*/
options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}
int main(int argc, char **argv)
{
int fd;
int nread;
char buff[512];
char *dev ="/dev/tty01";
fd = OpenDev(dev);
if (fd>0)
set_speed(fd,4800);
else
{
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd,8,1,'N')== FALSE)
{
printf("Set Parity Error\n");
exit(1);
}
sprintf(buff, "1234567890");
while(1)
{
while((nread = write(fd,buff,10))>0)
{
printf("\nLen %d\n",nread);
buff[nread+1]='\0';
printf("\n%s",buff);
sleep(1);
}
}
//close(fd);
//exit(0);
}
接收函数:
int main(int argc, char **argv)
{
int fd;
int nread;
char buff[512];
char *dev ="/dev/tty00";
fd = OpenDev(dev);
if (fd>0)
set_speed(fd,4800);
else
{
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd,8,1,'N')== FALSE)
{
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);
// sleep(1);
}
}
//close(fd);
//exit(0);
}
快点帮帮我啊,我都一个星期没弄好啦。