589 lines
19 KiB
C
589 lines
19 KiB
C
/***************************************************************
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Copyright © huijue Network Co., Ltd. 1998-2129. All rights reserved.
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Copyright © 上海汇珏网络通信设备股份有限公司 1998-2129. All rights reserved.
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文件名 : uart_passthrough.c
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作者 : kooloo
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版本 : V1.0
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描述 : 串口处理文件 支持读 写 透传 方便调试4G模块
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硬件平台 : iMX6ULL
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内核版本 : linux-imx-4.1.15-2.1.0-g3dc0a4b-v2.7
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编译器版本 ：gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf
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日志 : 初版V1.0 2023/7/15 kooloo创建
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***************************************************************/
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#define _GNU_SOURCE //在源文件开头定义_GNU_SOURCE宏
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include <termios.h>
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typedef struct uart_hardware_cfg {
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unsigned int baudrate; /* 波特率 */
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unsigned char dbit; /* 数据位 */
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char parity; /* 奇偶校验 */
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unsigned char sbit; /* 停止位 */
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} uart_cfg_t;
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static struct termios old_cfg; //用于保存终端的配置参数
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static int fd; //串口终端对应的文件描述符
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static struct termios passthroughold_cfg; //用于保存终端的配置参数
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static int passthroughfd; //串口终端对应的文件描述符
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: uart_init
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** 功能描述: 串口初始化 主串口 电脑侧连接的串口 初始化
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** 参数描述: 参数device表示串口终端的设备节点
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static int uart_init(const char *device)
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{
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/* 打开串口终端 */
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fd = open(device, O_RDWR |O_NONBLOCK); //O_NOCTTY
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if (0 > fd) {
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fprintf(stderr, "open error: %s: %s\n", device, strerror(errno));
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return -1;
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}
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/* 获取串口当前的配置参数 */
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if (0 > tcgetattr(fd, &old_cfg)) {
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fprintf(stderr, "tcgetattr error: %s\n", strerror(errno));
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close(fd);
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return -1;
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}
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return 0;
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}
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: uart_initpassthrough
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** 功能描述: 串口初始化 透传目的端口 初始化
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** 参数描述: 参数device表示串口终端的设备节点
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static int uart_initpassthrough(const char *device)
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{
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/* 打开串口终端 */
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passthroughfd = open(device, O_RDWR |O_NONBLOCK);
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if (0 > passthroughfd) {
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fprintf(stderr, "open error: %s: %s\n", device, strerror(errno));
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return -1;
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}
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/* 获取串口当前的配置参数 */
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if (0 > tcgetattr(passthroughfd, &passthroughold_cfg)) {
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fprintf(stderr, "tcgetattr error: %s\n", strerror(errno));
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close(passthroughfd);
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return -1;
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}
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return 0;
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}
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: uart_cfg
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** 功能描述: 串口配置 主串口 电脑侧连接的串口 配置
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** 参数描述: 参数cfg指向一个uart_cfg_t结构体对象
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static int uart_cfg(const uart_cfg_t *cfg)
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{
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struct termios new_cfg = {0}; //将new_cfg对象清零
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speed_t speed;
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/* 设置为原始模式 */
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cfmakeraw(&new_cfg);
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/* 使能接收 */
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new_cfg.c_cflag |= CREAD;
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/* 设置波特率 */
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switch (cfg->baudrate) {
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case 1200: speed = B1200;
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break;
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case 1800: speed = B1800;
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break;
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case 2400: speed = B2400;
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break;
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case 4800: speed = B4800;
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break;
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case 9600: speed = B9600;
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break;
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case 19200: speed = B19200;
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break;
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case 38400: speed = B38400;
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break;
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case 57600: speed = B57600;
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break;
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case 115200: speed = B115200;
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break;
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case 230400: speed = B230400;
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break;
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case 460800: speed = B460800;
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break;
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case 500000: speed = B500000;
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break;
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default: //默认配置为115200
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speed = B115200;
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printf("default baud rate: 115200\n");
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break;
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}
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if (0 > cfsetspeed(&new_cfg, speed)) {
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fprintf(stderr, "cfsetspeed error: %s\n", strerror(errno));
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return -1;
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}
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/* 设置数据位大小 */
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new_cfg.c_cflag &= ~CSIZE; //将数据位相关的比特位清零
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switch (cfg->dbit) {
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case 5:
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new_cfg.c_cflag |= CS5;
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break;
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case 6:
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new_cfg.c_cflag |= CS6;
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break;
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case 7:
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new_cfg.c_cflag |= CS7;
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break;
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case 8:
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new_cfg.c_cflag |= CS8;
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break;
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default: //默认数据位大小为8
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new_cfg.c_cflag |= CS8;
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printf("default data bit size: 8\n");
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break;
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}
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/* 设置奇偶校验 */
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switch (cfg->parity) {
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case 'N': //无校验
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new_cfg.c_cflag &= ~PARENB;
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new_cfg.c_iflag &= ~INPCK;
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break;
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case 'O': //奇校验
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new_cfg.c_cflag |= (PARODD | PARENB);
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new_cfg.c_iflag |= INPCK;
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break;
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case 'E': //偶校验
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new_cfg.c_cflag |= PARENB;
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new_cfg.c_cflag &= ~PARODD; /* 清除PARODD标志，配置为偶校验 */
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new_cfg.c_iflag |= INPCK;
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break;
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default: //默认配置为无校验
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new_cfg.c_cflag &= ~PARENB;
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new_cfg.c_iflag &= ~INPCK;
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printf("default parity: N\n");
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break;
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}
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/* 设置停止位 */
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switch (cfg->sbit) {
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case 1: //1个停止位
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new_cfg.c_cflag &= ~CSTOPB;
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break;
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case 2: //2个停止位
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new_cfg.c_cflag |= CSTOPB;
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break;
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default: //默认配置为1个停止位
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new_cfg.c_cflag &= ~CSTOPB;
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printf("default stop bit size: 1\n");
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break;
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}
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/* 将MIN和TIME设置为0 */
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new_cfg.c_cc[VTIME] = 0;
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new_cfg.c_cc[VMIN] = 0;
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/* 清空缓冲区 */
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if (0 > tcflush(fd, TCIOFLUSH)) {
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fprintf(stderr, "tcflush error: %s\n", strerror(errno));
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return -1;
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}
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/* 写入配置、使配置生效 */
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if (0 > tcsetattr(fd, TCSANOW, &new_cfg)) {
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fprintf(stderr, "tcsetattr error: %s\n", strerror(errno));
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return -1;
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}
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/* 配置OK 退出 */
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return 0;
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}
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: uart_cfgpassthrough
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** 功能描述: 串口配置 串口配置 透传目的端口 配置
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** 参数描述: 参数cfg指向一个uart_cfg_t结构体对象
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static int uart_cfgpassthrough(const uart_cfg_t *cfg)
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{
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struct termios new_cfg = {0}; //将new_cfg对象清零
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speed_t speed;
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/* 设置为原始模式 */
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cfmakeraw(&new_cfg);
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/* 使能接收 */
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new_cfg.c_cflag |= CREAD;
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/* 设置波特率 */
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switch (cfg->baudrate) {
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case 1200: speed = B1200;
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break;
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case 1800: speed = B1800;
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break;
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case 2400: speed = B2400;
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break;
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case 4800: speed = B4800;
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break;
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case 9600: speed = B9600;
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break;
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case 19200: speed = B19200;
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break;
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case 38400: speed = B38400;
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break;
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case 57600: speed = B57600;
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break;
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case 115200: speed = B115200;
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break;
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case 230400: speed = B230400;
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break;
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case 460800: speed = B460800;
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break;
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case 500000: speed = B500000;
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break;
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default: //默认配置为115200
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speed = B115200;
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printf("default baud rate: 115200\n");
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break;
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}
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if (0 > cfsetspeed(&new_cfg, speed)) {
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fprintf(stderr, "cfsetspeed error: %s\n", strerror(errno));
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return -1;
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}
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/* 设置数据位大小 */
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new_cfg.c_cflag &= ~CSIZE; //将数据位相关的比特位清零
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switch (cfg->dbit) {
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case 5:
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new_cfg.c_cflag |= CS5;
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break;
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case 6:
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new_cfg.c_cflag |= CS6;
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break;
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case 7:
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new_cfg.c_cflag |= CS7;
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break;
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case 8:
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new_cfg.c_cflag |= CS8;
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break;
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default: //默认数据位大小为8
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new_cfg.c_cflag |= CS8;
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printf("default data bit size: 8\n");
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break;
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}
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/* 设置奇偶校验 */
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switch (cfg->parity) {
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case 'N': //无校验
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new_cfg.c_cflag &= ~PARENB;
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new_cfg.c_iflag &= ~INPCK;
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break;
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case 'O': //奇校验
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new_cfg.c_cflag |= (PARODD | PARENB);
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new_cfg.c_iflag |= INPCK;
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break;
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case 'E': //偶校验
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new_cfg.c_cflag |= PARENB;
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new_cfg.c_cflag &= ~PARODD; /* 清除PARODD标志，配置为偶校验 */
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new_cfg.c_iflag |= INPCK;
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break;
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default: //默认配置为无校验
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new_cfg.c_cflag &= ~PARENB;
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new_cfg.c_iflag &= ~INPCK;
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printf("default parity: N\n");
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break;
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}
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/* 设置停止位 */
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switch (cfg->sbit) {
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case 1: //1个停止位
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new_cfg.c_cflag &= ~CSTOPB;
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break;
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case 2: //2个停止位
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new_cfg.c_cflag |= CSTOPB;
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break;
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default: //默认配置为1个停止位
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new_cfg.c_cflag &= ~CSTOPB;
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printf("default stop bit size: 1\n");
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break;
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}
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/* 将MIN和TIME设置为0 */
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new_cfg.c_cc[VTIME] = 0;
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new_cfg.c_cc[VMIN] = 0;
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/* 清空缓冲区 */
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if (0 > tcflush(passthroughfd, TCIOFLUSH)) {
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fprintf(stderr, "tcflush error: %s\n", strerror(errno));
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return -1;
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}
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/* 写入配置、使配置生效 */
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if (0 > tcsetattr(passthroughfd, TCSANOW, &new_cfg)) {
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fprintf(stderr, "tcsetattr error: %s\n", strerror(errno));
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return -1;
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}
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/* 配置OK 退出 */
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return 0;
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}
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/***
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--dev=/dev/ttymxc2
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--brate=115200
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--dbit=8
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--parity=N
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--sbit=1
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--type=read
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***/
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: show_help
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** 功能描述: 打印帮助信息
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** 参数描述:
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static void show_help(const char *app)
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{
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printf("Usage: %s [选项]\n"
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"\n必选选项:\n"
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" --dev=DEVICE 指定串口终端设备名称, 譬如--dev=/dev/ttymxc2\n"
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" --type=TYPE 指定操作类型, 读串口还是写串口, 譬如--type=read(read表示读、write表示写、passthrough表示透传、其它值无效)\n"
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"\n可选选项:\n"
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" --brate=SPEED 指定串口波特率, 譬如--brate=115200\n"
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" --dbit=SIZE 指定串口数据位个数, 譬如--dbit=8(可取值为: 5/6/7/8)\n"
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" --parity=PARITY 指定串口奇偶校验方式, 譬如--parity=N(N表示无校验、O表示奇校验、E表示偶校验)\n"
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" --sbit=SIZE 指定串口停止位个数, 譬如--sbit=1(可取值为: 1/2)\n"
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" --passthroughdev=DEVICE 指定串口终端目的端口,此模式只有在type模式为透传模式时才有意义)\n"
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" --help 查看本程序使用帮助信息\n\n", app);
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}
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: io_handler
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** 功能描述: 信号处理函数，当串口有数据可读时，会跳转到该函数执行
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** 参数描述:
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static void io_handler(int sig, siginfo_t *info, void *context)
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{
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unsigned char buf[1024] = {0};
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int ret;
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int n;
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if(SIGRTMIN != sig)
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return;
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/* 判断串口是否有数据可读 */
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if (POLL_IN == info->si_code) {
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ret = read(fd, buf, 1024); //一次最多读1024个字节数据
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printf("[ ");
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for (n = 0; n < ret; n++)
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printf("0x%hhx ", buf[n]);
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printf("]\n");
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}
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}
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/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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** 函数名称: async_io_init
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** 功能描述: 异步I/O初始化函数
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** 参数描述:
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** 作 者: kooloo
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** 日 期: 2022年03月21
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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static void async_io_init(void)
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{
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struct sigaction sigatn;
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int flag;
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/* 使能异步I/O */
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flag = fcntl(fd, F_GETFL); //使能串口的异步I/O功能
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flag |= O_ASYNC;
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fcntl(fd, F_SETFL, flag);
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/* 设置异步I/O的所有者 */
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fcntl(fd, F_SETOWN, getpid());
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/* 指定实时信号SIGRTMIN作为异步I/O通知信号 */
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fcntl(fd, F_SETSIG, SIGRTMIN);
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/* 为实时信号SIGRTMIN注册信号处理函数 */
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sigatn.sa_sigaction = io_handler; //当串口有数据可读时，会跳转到io_handler函数
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sigatn.sa_flags = SA_SIGINFO;
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sigemptyset(&sigatn.sa_mask);
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sigaction(SIGRTMIN, &sigatn, NULL);
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}
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int main(int argc, char *argv[])
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{
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uart_cfg_t cfg = {0};
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uart_cfg_t passthroughcfg = {0};
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char *device = NULL;
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char *passthroughdevice =NULL; //透传时设备目的端口 kooloo add 202312
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int rw_flag = -1;
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// unsigned char w_buf[10] = {0x11, 0x22, 0x33, 0x44,
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// 0x55, 0x66, 0x77, 0x88}; //通过串口发送出去的数据
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unsigned char w_buf[10] = "ATI\n"; //通过串口发送出去的数据
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||
unsigned char passthroughBuf[100]; //透传buf kooloo add 202312
|
||
int passthroughlen; //透传长度 读取到多少数据就发送多少数据 kooloo add 202312
|
||
int n;
|
||
|
||
printf("Uart_passthroughApp \n"); //开机 程序打印信息 做区分使用
|
||
|
||
/* 解析出参数 */
|
||
for (n = 1; n < argc; n++) {
|
||
|
||
if (!strncmp("--dev=", argv[n], 6))
|
||
device = &argv[n][6];
|
||
else if (!strncmp("--passthroughdev=", argv[n], 17)) //新增 透传时目的端口 --passthroughdev kooloo add 202312
|
||
passthroughdevice = &argv[n][17];
|
||
else if (!strncmp("--brate=", argv[n], 8))
|
||
cfg.baudrate = atoi(&argv[n][8]);
|
||
else if (!strncmp("--dbit=", argv[n], 7))
|
||
cfg.dbit = atoi(&argv[n][7]);
|
||
else if (!strncmp("--parity=", argv[n], 9))
|
||
cfg.parity = argv[n][9];
|
||
else if (!strncmp("--sbit=", argv[n], 7))
|
||
cfg.sbit = atoi(&argv[n][7]);
|
||
else if (!strncmp("--type=", argv[n], 7)) {
|
||
if (!strcmp("read", &argv[n][7]))
|
||
rw_flag = 0; //读
|
||
else if (!strcmp("write", &argv[n][7]))
|
||
rw_flag = 1; //写
|
||
else if (!strcmp("passthrough", &argv[n][7]))
|
||
{
|
||
rw_flag = 2; //透传
|
||
}
|
||
else if (!strcmp("passthroughdbg", &argv[n][7]))
|
||
{
|
||
rw_flag = 3; //透传 带输出
|
||
}
|
||
}
|
||
else if (!strcmp("--help", argv[n])) {
|
||
show_help(argv[0]); //打印帮助信息
|
||
exit(EXIT_SUCCESS);
|
||
}
|
||
}
|
||
|
||
if (NULL == device || -1 == rw_flag) {
|
||
fprintf(stderr, "Error: the device and read|write type must be set!\n");
|
||
show_help(argv[0]);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
|
||
|
||
if(((rw_flag==2)||(rw_flag==3))&&(NULL==passthroughdevice)) //如果为透传模式 但透传目的端口不指定 则报错 kooloo add 202312
|
||
{
|
||
fprintf(stderr, "Error: the passthrough mode must be set!\n");
|
||
show_help(argv[0]);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
printf("test: %s %s type=%d\n",device,passthroughdevice,rw_flag); //要带\r\n 否则在缓冲区出不来 kooloo add 202312
|
||
/* 串口初始化 */
|
||
if (uart_init(device))
|
||
exit(EXIT_FAILURE);
|
||
|
||
/* 串口配置 */
|
||
if (uart_cfg(&cfg)) {
|
||
tcsetattr(fd, TCSANOW, &old_cfg); //恢复到之前的配置
|
||
close(fd);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
|
||
if((rw_flag==2)||(rw_flag==3)) //如果为透传模式 则初始化目的端口
|
||
{
|
||
/* 串口初始化 */
|
||
if (uart_initpassthrough(passthroughdevice))
|
||
exit(EXIT_FAILURE);
|
||
|
||
/* 串口配置 */
|
||
if (uart_cfgpassthrough(&passthroughcfg)) {
|
||
tcsetattr(passthroughfd, TCSANOW, &passthroughold_cfg); //恢复到之前的配置
|
||
close(passthroughfd);
|
||
exit(EXIT_FAILURE);
|
||
}
|
||
printf("test: %s %s type=%d\n",device,passthroughdevice,rw_flag);
|
||
}
|
||
/* 读|写串口 */
|
||
switch (rw_flag) {
|
||
case 0: //读串口数据
|
||
async_io_init(); //我们使用异步I/O方式读取串口的数据，调用该函数去初始化串口的异步I/O
|
||
for ( ; ; )
|
||
sleep(1); //进入休眠、等待有数据可读，有数据可读之后就会跳转到io_handler()函数
|
||
break;
|
||
case 1: //向串口写入数据
|
||
for ( ; ; ) { //循环向串口写入数据
|
||
write(fd, w_buf, 5); //一次向串口写入8个字节
|
||
sleep(1); //间隔1秒钟
|
||
}
|
||
break;
|
||
case 2: //透传模式 device 为中转口，passthroughdevice为目的端口
|
||
case 3: //透传模式 device 为中转口，passthroughdevice为目的端口
|
||
for ( ; ; )
|
||
{
|
||
passthroughlen = read(fd, passthroughBuf, sizeof(passthroughBuf)); //一次最多读passthroughBuf个字节数据
|
||
|
||
//printf("test %d\n",passthroughlen);
|
||
if(passthroughlen>0) //如果有数据 则转发
|
||
{
|
||
write(passthroughfd, passthroughBuf, passthroughlen); //一次向串口写入passthroughBuf个字节
|
||
if(rw_flag==3)
|
||
{
|
||
printf("pt %s to %s: %s \n",device,passthroughdevice,passthroughBuf); //将数据打印出来 kooloo add 2023
|
||
}
|
||
else
|
||
{
|
||
//printf("test %d\n",passthroughlen);
|
||
}
|
||
}
|
||
|
||
passthroughlen = read(passthroughfd, passthroughBuf, sizeof(passthroughBuf)); //一次最多读passthroughBuf个字节数据
|
||
if(passthroughlen>0) //如果有数据 则转发
|
||
{
|
||
write(fd, passthroughBuf, passthroughlen); //一次向串口写入passthroughBuf个字节
|
||
if(rw_flag==3)
|
||
{
|
||
printf("pt %s to %s: %s \n",passthroughdevice,device,passthroughBuf); //将数据打印出来 kooloo add 2023
|
||
}
|
||
else
|
||
{
|
||
//printf("test %d\n",passthroughlen);
|
||
}
|
||
}
|
||
usleep(10*1000); //间隔10ms钟
|
||
//sleep(1); //间隔1秒钟
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* 退出 */
|
||
tcsetattr(fd, TCSANOW, &old_cfg); //恢复到之前的配置
|
||
close(fd);
|
||
if(rw_flag==2) //如果为透传模式 则初始化目的端口
|
||
{
|
||
tcsetattr(passthroughfd, TCSANOW, &old_cfg); //恢复到之前的配置
|
||
close(passthroughfd);
|
||
}
|
||
exit(EXIT_SUCCESS);
|
||
}
|