028——从GUI-＞Client-＞Server-＞driver实现对SR04的控制

本文主要是介绍028——从GUI-＞Client-＞Server-＞driver实现对SR04的控制，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、修改GUI

2、修改数据处理和发送缓冲区的帧

3、修改server中对SR04的处理

4、添加SR04的dirver_handle

5、验证

6、遇到问题及解决方法

7、项目管理操作

1、修改GUI

2、修改数据处理和发送缓冲区的帧

添加对SR04按键事件处理

添加对接收数据的处理

3、修改server中对SR04的处理

                printf("SR04!!!\n");if ('g' == cmd[4]){opt = sr04_handle(&get_data);if (NOERROR == opt){sprintf(buf,"@002g%03d", get_data);tx_buffer = buf;}else{tx_buffer = "@002e";}}printf(">>>>>>%s\n",tx_buffer);         if (send(acceptfd, tx_buffer, strlen(tx_buffer), 0) < 0){perror("send failed");  }

4、添加SR04的dirver_handle

/*
*author   : xintianyu
*function : Handle sr501 Settings
*date     : 2024-4-18
-----------------------
author date  modify*/
int sr04_handle(int *data)
{char *device = "/dev/CEBSS_sr04";int ret = NOERROR;static int fd;struct pollfd fds[1];int val;/* 打开文件 */fd = open(device, O_RDWR);if (fd == -1){printf("can not open file %s\n", device);return ERROR;}ioctl(fd, CMD_TRIG);printf("I am goning to read distance: \n");fds[0].fd = fd;fds[0].events = POLLIN;if (1 == poll(fds, 1, 5000)){if (read(fd, &val, 4) == 4){printf("get distance: %d cm\n", val*17/1000000);*data = val*17/1000000;}elseprintf("get distance err\n");}else{printf("get distance poll timeout/err\n");ret = ERROR;}if (*data > 450){ret = ERROR;}close(fd);return ret;
}

5、验证

6、遇到问题及解决方法

/home/book/program/cebss/server/src/driver_handle.c:144:2: error: implicit declaration of function ‘ioctl’ [-Werror=implicit-function-declaration]
ioctl(fd, CMD_TRIG);
^~~~~
cc1: all warnings being treated as errors

添加ioctl的头文件

/home/book/program/cebss/server/src/tcp.c:239:25: error: ‘tx_buffer’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
sprintf(tx_buffer,"@001g%d", get_data);

sprintf函数的buf必须是初始化过的内存比如数组或者malloc的地址