#include <unistd.h>
#include <stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include <termios.h>
#define FALSE -1
#define TRUE 0
/**
*@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:
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,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);
}
/* **
*@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]) {
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);
}
}
}
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;
}
int main(){
int i,n,z=2,rtn;
int nGPSCount = 0;
char cGPSbuf[1024];
char *cmd[5]={"AT+ZGINIT\r\n","AT+ZGMODE=3\r\n","AT+ZGQOS=50,255\r\n","AT+ZGFIXRATE=2147483647,0\r\n","AT+ZGRUN=2\r\n"};
char *devw = "/dev/ttyUSB2";
int fd,count=100,ret=-1;
int nread;
char buff[512];
char *p;
char *dev = "/dev/ttyUSB1";
//———————-
fd = OpenDev(devw);
set_speed(fd,9600);
if (set_Parity(fd,8,1,'N') == FALSE) {
printf("Set Parity Error\n");
return ret;
}
n= sizeof(cmd)/sizeof(char*);
printf("n:%d\n",n);
for(i=0;i<n;i++){
if(write(fd, cmd[i], strlen(cmd[i])) <= 0)
{
fprintf(stdout, "Write AT cmd Error!\n");
return -1;
}
usleep(50);
nGPSCount = read (fd, cGPSbuf, 512);
printf("nGPSCount:%d\n",nGPSCount);
if(nGPSCount==-1){close (fd);printf("return;");return -1;}
if(nGPSCount>0){
cGPSbuf[nGPSCount+1]='\0';
printf("cGPSbuf:%s\n",cGPSbuf);
}
}
close (fd);
printf("————————-\n");
//———————-
fd = OpenDev(dev);
set_speed(fd,9600);
if (set_Parity(fd,8,1,'N') == FALSE) {
printf("Set Parity Error\n");
return ret;
}
while (count–) //循环读取数据
{
if(ret == 0)break;
while((nread = read(fd, buff, 512))>0)
{
printf("\nLen %d\n",nread);
buff[nread+1] = '\0';
printf( "\n%s", buff);
p=strchr(buff,'$');
if(p){
ret=0;
break;
}
}
}
close(fd);
return ret;
}
转载于:https://blog.51cto.com/jkers/1044512