本帖最后由 ljljd103 于 2014-4-16 22:47 编辑
#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>
#include <sys/time.h>
#define FALSE -1
#define TRUE 0
int speed_arr[] = { B115200, B57600, B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 300, };
unsigned char SetBaud_115200[14];
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)
{
tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr);
cfsetospeed(&Opt, speed_arr);
//printf("set baud:%d\n", name_arr);
status = tcsetattr(fd, TCSANOW, &Opt);
if (status != 0)
{
perror("tcsetattr fd");
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)
{
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;
tcflush(fd,TCIOFLUSH);
options.c_cc[VTIME] = 50; /* 设置超时5 seconds*/
options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
options.c_cc[VINTR] = 0; /**//* Ctrl-c */
options.c_cc[VQUIT] = 0; /**//* Ctrl- */
options.c_cc[VERASE] = 0; /**//* del */
options.c_cc[VKILL] = 0; /**//* @ */
options.c_cc[VEOF] = 0; /**//* Ctrl-d */
options.c_cc[VSWTC] = 0; /**//* '' */
options.c_cc[VSTART] = 0; /**//* Ctrl-q */
options.c_cc[VSTOP] = 0; /**//* Ctrl-s */
options.c_cc[VSUSP] = 0; /**//* Ctrl-z */
options.c_cc[VEOL] = 0; /**//* '' */
options.c_cc[VREPRINT] = 0; /**//* Ctrl-r */
options.c_cc[VDISCARD] = 0; /**//* Ctrl-u */
options.c_cc[VWERASE] = 0; /**//* Ctrl-w */
options.c_cc[VLNEXT] = 0; /**//* Ctrl-v */
options.c_cc[VEOL2] = 0; /**//* '' */
options.c_cflag |= (CLOCAL | CREAD); //忽略DCD信号
options.c_cflag &= ~CRTSCTS; //关硬件流控制
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); //关回显
options.c_oflag &= ~OPOST; //行式输出
options.c_iflag &= ~(IXON | IXOFF | IXANY); //关软件流控制
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}
int OpenDev(char *Dev)
{
int fd = open( Dev, O_RDWR | O_NOCTTY | O_NDELAY); //| O_NOCTTY
if (-1 == fd)
{
perror("Can't Open Serial Port");
return -1;
}
else
return fd;
}
int main(int argc, char **argv)
{
int gps_fd, uart_fd, i;
int nread, nwrite;
int num = 0;
char rev_char[1];
char rev_buf[128];
//char rev_buf[]="helloWorld!";
char *dev = "/dev/s3c2410_serial2"; //串口二
if (gps_fd = open("/dev/TX2440-gps", 0) < 0)
{
perror("open device gps");
exit (0);
}
uart_fd = OpenDev(dev); //打开设备
if(fcntl(uart_fd, F_SETFL, 0)<0)
{
printf("fcntl failed!\n");
}
if(isatty(STDIN_FILENO)>0)
{
printf("standard input is not a terminal device\n");
}
set_speed(uart_fd, 57600); //设置波特率
if (set_Parity(uart_fd,8,1,'n') == FALSE) //数据位，停止位，校验位
{
printf("Set Parity Error\n");
exit (0);
}
while(1)
{
printf("wait...\n");
nread = read(uart_fd, rev_buf, 10); //读返回值
if(nread >0)
{ rev_buf[nread] = '\0';
printf("%s\n\r",rev_buf);
}
else printf("Read data failure!\n");
//Send data
nwrite = write(uart_fd,rev_buf,strlen(rev_buf));
printf("send data OK!count=%d\n\r",nwrite);
printf("\r\n");
}
close(uart_fd);
close(gps_fd);
return 0;
}
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