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sendat.c
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sendat.c
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#ifndef _UART_H_
#define _UART_H_
#include <stdio.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
int serial_init(char *device, int speed, int databits, int parity, int stopbits, int RTSCTS, int newline);
int serial_write(int fd, void *src, int len);
int serial_read(int fd, char *buf, int len);
//串口默认初始化接口
#define serial_default(device) serial_init(device, 1500000, 8, 'n', 1, 0, 1)
#endif
/**
*@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 speed 类型 int 波特率
*@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 char 效验类型 取值为N,E,O,S
*@param newline 类型 int 新的一行输出
*/
int set_parity(int fd, int speed, int databits, int parity, int stopbits, int RTSCTS, int newline)
{
struct termios options;
if ( tcgetattr(fd, &options) != 0) {
return -1;
}
cfsetispeed(&options, speed);
cfsetospeed(&options, speed);
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:
return -1;
}
options.c_iflag |= INPCK;
cfmakeraw(&options);
//options.c_lflag |= (ICANON | ECHO | ECHOE);
//options.c_lflag &= ~(ICANON | ECHO | ECHOE);
//options.c_iflag &= ~(IXON | IXOFF);
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*/
break;
case 'e':
case 'E':
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD; /* 转换为偶效验*/
break;
case 'S':
case 's': /*as no parity*/
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default:
return -1;
}
/* 设置停止位*/
switch (stopbits)
{
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag |= CSTOPB;
break;
default:
return -1;
}
/* Set rts/cts */
if (RTSCTS)
{
options.c_cflag |= CRTSCTS;
}
if (newline)
{
options.c_lflag |= ICANON;
}
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)
{
return -1;
}
// printf("set_Parity\n");
return 0;
}
/**
*@brief
*@param device 串口设备
*@param speed 串口速度
*@param databits,parity,stopbits,RTSCTS,分别为数据位,校验位,停止位,rtscts位
*@param newline 接收数据结尾是否加换行符?
*/
int serial_init(char *device, int speed, int databits, int parity, int stopbits, int RTSCTS, int newline)
{
int fd, ret;
fd = open(device, O_RDWR|O_NOCTTY);//O_NONBLOCK 非阻塞, O_WRONLY 只读写, O_RDONLY 只读, O_RDWR 读写,O_NOCTTY 阻塞
if (-1 == fd) {
fprintf(stderr, "ERROR: init %s failed\n", device);
return -1;
}
ret = set_parity(fd, speed, databits, parity, stopbits, RTSCTS, newline);
if (ret < 0) {
fprintf(stderr, "ERROR: set parity failed\n");
return -1;
}
return fd;
}
/**
*@brief
*@param fd 串口端口号文件描述符
*@param src 需要通过串口发送的数据
*@param len 需要发送的数据长度
*@param 成功返回0, 否则返回-1
*/
int serial_write(int fd, void *src, int len)
{
int ret = write(fd, src, len);
if (len != ret) {
fprintf(stderr, "ERROR: write serial failed!\n");
return -1;
}
return 0;
}
/**
*@brief
*@param fd 串口端口号文件描述符
*@param src 串口接收数据的指针
*@param len 需要接收的数据长度
*@param 成功返回0, 否则返回-1
*/
int serial_read(int fd, char *buf, int len)
{
int ret = read(fd, buf, len-1);
if (-1 == ret) {
fprintf(stderr, "ERROR: read serial failed!\n");
return -1;
}
buf[ret] = '\0';
return ret;
}
static void timeout()
{
fprintf(stderr, "No response from modem.\n");
exit(1);
}
/*字符包含判断*/
static int starts_with(const char* prefix, const char* str)
{
while(*prefix)
{
if (*prefix++ != *str++)
{
return 0;
}
}
return 1;
}
/*判断是否存在*/
int file_exist(const char* filename)
{
if (filename && access(filename, F_OK) == 0) {
return 1;
}
return 0;
}
int main(int argc, char **argv)
{
if(argc != 3)
{
fprintf(stderr, "Usage: sendat 2 'ATI'\n");
return 1;
}
char device[16];
sprintf(device, "/dev/ttyUSB%s", argv[1]);
char *message= argv[2];
if (*message=='\0')
{
fprintf(stderr, "ERROR: AT Command Absent.\n");
return 1;
}
if(file_exist(device)==0)
{
fprintf(stderr, "ERROR: AT Device Absent.\n");
return 1;
}
signal(SIGALRM, timeout);
alarm(5);
char *rn= "\r\n";
char buff[1024];
int fd = serial_default(device);
if(fd < 0) return 1;
char *msg= strcat(message, rn);
serial_write(fd, msg, strlen(msg));
int ret=0;
while(1) {
int read = serial_read(fd, buff, sizeof(buff));
printf("%s", buff);
if(starts_with("OK", buff)) {
break;
}
if(starts_with("ERROR", buff)) {
ret=1;
break;
}
if(starts_with("COMMAND NOT SUPPORT", buff)) {
ret=1;
break;
}
if(starts_with("+CME ERROR", buff)) {
ret=1;
break;
}
if(starts_with("+CMS ERROR", buff)) {
ret=1;
break;
}
}
close(fd);
return ret;
}