#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 <time.h>
#define BAUDRATE B9600
#define DEVICE "/dev/ttyS0"
#define _POSIX_SOURCE 1
#define FALSE 0
#define TRUE 1
/***@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);
}
}
/**
*@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;
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 (FALSE);
}
return (TRUE);
}
/**
*@breif 打开串口
*/
int OpenDev(char *Dev) {
int fd = open(Dev, O_RDWR); //| O_NOCTTY | O_NDELAY
if (-1 == fd) { /*设置数据位数*/
perror("Can't Open Serial Port");
return -1;
} else
return fd;
}
/**
*@breif 输出字节数组
*/
void printfCharArr(unsigned char buff[] ,int len) {
int i;
//int len = sizeof (buff) / sizeof (unsigned char);
//printf("长度是%d",len);
for (i = 0; i<len; i++) {
printf("%X ", buff[i]);
}
printf("\n");
}
/**
*@breif main()
*/
int main(int argc, char **argv) {
int fd; //定义通信句柄
int nread; //定义读取字节长度
unsigned char buff[512]; //定义串口接收字节数组
char *dev = "/dev/ttyS0"; //串口选择
fd = OpenDev(dev); //打开串口
if (fd > 0) {
printf("Open Serial Port!%d\n", fd);
set_speed(fd, 4800); //打开串口成功设置波特率
} else {
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd, 8, 1, 'E') == FALSE) { //设置校验位，校验类型
printf("Set Parity Error\n");
exit(1);
}
//设置发送字节数组
unsigned char cbuf[] = {0x68, 0x22, 0x44, 0x70, 0x00, 0x00
, 0x00, 0x68, 0x01, 0x02, 0x52, 0xC3, 0xBE, 0x16};
int res_w = write(fd, cbuf, 14); //向串口发送数据
//如果发送成功则输出发送字节数组内容
if (res_w > 0) {
printfCharArr(cbuf,14);
}
sleep(1); //等待1秒
//等待接收返回信息
if ((nread = read(fd, buff, 512)) > 0) {
printfCharArr(buff,nread);
}
printf("********************************");
close(fd);
exit(0);
}