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#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>
#define FALSE -1
#define TRUE 0
#define LENGTH 12
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};
int OpenDev(char *Dev);
void set_speed(int fd, int speed);
int set_Parity(int fd, int databits, int stopbits, int parity);
int main(int argc, char **argv)
{
int fd;
int nread;
int count = 0;//计算收发次数
char *dev = "/dev/ttyS4"; //USB串口
fd = OpenDev(dev);
tcflush(fd, TCIFLUSH);
set_speed(fd,38400);
if (set_Parity(fd,8,1,'N') == FALSE)
{
printf("Set Parity Error\n");
exit (0);
}
char send[LENGTH] = {0xC0,0xAA,0x01,0x80,0x00,0x00,0xF7,0x3F,0x04,0x4C,0xC0,0x0A};
char send[LENGTH] = "hello,world\n";
char recv[100] = {0};
//fgets(send,LENGTH,stdin);
// for(count=1;count<=3;++count)
// {
printf("##################\n");
// printf("这是第%d次收发\n",count);
count = write(fd, send, LENGTH);
printf("写入的%d个字节\n",count);
int i =0;
for(i;i<LENGTH;++i)
{
printf("send: %x\n", send[i]);
}
// while(1)
// {
while((nread = read(fd,recv,512)) > 0)
{
printf("Len: %d\n", nread);
int j = 0;
for(j;j<nread;++j)
{
printf("recv:%x\n", recv[j]);
}
}
if(nread<0){
perror("read:");
}
printf("read = %d\n\n",nread);
printf("##########################\n");
// sleep(5);
// }
// }
close(fd);
return 0;
}
/**
* *@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
* */
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 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:
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);
}
/**********************************************************************
* 代码说明:使用usb串口测试的,发送的数据是字符,
* 但是没有发送字符串结束符号,所以接收到后,后面加上了结束符号。
* **********************************************************************/
/*********************************************************************/
int OpenDev(char *Dev)
{
int fd = open(Dev, O_RDWR|O_NOCTTY);//阻塞方式 //| O_NOCTTY | O_NDELAY 非阻塞
if (-1 == fd)
{
perror("Can't Open Serial Port");
return -1;
}
else
return fd;
}