• 项目描述:该系列记录了STM32G0+EMW3080实现单片机智能联网功能项目的从零开始一步步的实现过程;
  • 硬件环境:单片机为STM32G030C8T6;物联网模块为EMW3080V2-P;网联网模块的开发板为MXKit开发套件,具体型号为XCHIP
    MXKit-Base V2.2;
  • 软件环境:STM32需要的软件有STM32CubeMX和STM32CubeIDE;开发IDE为eclipse;MXKit的串口调试工具使用的是putty.exe;
  • 串口指令:串口指令使用的是AT指令; 通信方式使用的是UART
  • 项目过程:本项目采用模块化的形式一步步的实现STM32G0+EMW3080+阿里云实现单片机智能联网功能;第一步先使用MXKit开发板和PC进行通信;第二步是配置阿里云飞燕平台;第三步是MXKit开发板实现配网功能,MXKit和阿里云之间成功通讯;第四步是STM32G0单片机实现和EMW3080的串口通讯;第五步是测试整体的功能;

本节为该项目的第四节,主要任务是实现STM32G030C8T6控制EMW3080实现IoT功能,即STM32G030C8T6控制EMW3080实现配网、断网重连、以及数据的下发、app控制设备等;最终的结果是,单片机上电后,向EMW3080发送配网指令,配网成功后,在云智能app端下发指令能够控制单片机上的LED等开和关;当然也支持wifi断开重连等功能;

经过上一篇文章,STM32G0+EMW3080+阿里云飞燕平台实现单片机WiFi智能联网功能(三)EMW3080完成配网,EMW3080连接到阿里云飞平台,通过串口调试EMW3080已经能成功的进行配网了,所以我们现在要做的就是,让STM32G030C8T6来发送配网指令,完成EMW3080的配网过程,并且在完成配网后,可以向STM32G030C8T6发送和接收数据用于控制设备;

文章目录

  • 一、硬件连接
  • 二、代码实现
  • 笔记

一、硬件连接

STM32G030C8T6和EMW3080的连接原理图如下图所示:

其中,使用STM32G030C8T6的UART1串口,接到EMW3080的UART串口上,接线如上图所示;然后STM32G030C8T6通过STLINK或JLINK连接到电脑上,便于调试和烧写程序;EMW3080开发板通过自带电源线也连接到电脑的USB端口上用于供电;这样接线部分就接好了;
需要注意的是,STM32G030C8T6我是用的是USART1;EMW3080开发板上有“UART”和“DEBUG”两个区域都由RX和TX,

我们需要使用UART区域中的RX和TX,而不是DEBUG中的,如果不小心使用了DEBUG中的RX和TX,指令虽然也能发送到EMW3080,但是无法识别;

接线完成后,实物图如下所示:

二、代码实现

接下来就是在STM32G030C8T6中编写代码实现向EMW3080发送AT指令进行配网,并根据返回的信息判断是否配网成功;待配网成功后,STM32G030C8T6接收云端发下来的指令,并进行响应的控制;本代码示例中通过下发LED等开和关的指令,控制STM32上的灯亮和灭;

整个工程的代码可以从以下链接中下载(https://download.csdn.net/download/AnChenliang_1002/88511568)

下载后的资源可以直接用STM32CubeIDE运行;

下面大致讲解一下代码结构:

主要的源文件如上图所示,其中我们IoT的功能主要在wilo_wifiMoudule.c中实现;

附上wilo_wifiMoudule.c的完整代码:

#include "wilo_wifiModule.h"#include "wilo_uart.h"#define DISCONNECT_TRUE 1#define DISCONNECT_FALSE 0extern UART_HandleTypeDef huart1;extern uint8_t rxBuffer[128];extern __IO uint8_t receivedIndex;//跟踪接收到的字符的索引extern uint8_t stringMatched ;//是否接收到完整的字符串extern uint8_t receivedData[128]; // 全局数组用于存储完整接收到的内容extern __IO uint8_t receivedLength; // 当前接收到的数据长度,为0时表示未收到数据,大于0时表示收到了数据extern uint8_t preReceivedLength;//前一次接收到的数据长度extern const char* atCommands[] ;// 声明一个设备参数变量DeviceParameters deviceParams;void reset_receive(){// 重置接收索引,准备接收下一段内容receivedIndex = 0;stringMatched = 0;receivedLength = 0;preReceivedLength = 0;memset(receivedData,0,sizeof(receivedData));}// 发送指令并等待回复函数HAL_StatusTypeDef sendCommandAndWait(const char* command, const char* expectedReply){// 发送指令HAL_UART_Transmit_IT(&huart1, (uint8_t*)command, strlen(command));// 接收回复HAL_UART_Receive_IT(&huart1, &rxBuffer[receivedIndex], 1); while((0 == receivedLength))//如果还未接收到数据,一直等待;直到收到数据{OLED_ShowString(0,4,"wait response");}//HAL_UART_Transmit_IT(&huart1, (uint8_t*)"wait!!!!\r\n", 10);//OLED_Clear();//OLED清零while(0 == stringMatched )//如果还没有接收完所有数据,一直等待,直到接收完所有数据{ReceivedAll();//判断是否接收完所有字符串了}//HAL_UART_Transmit_IT(&huart1, (uint8_t*)"111\r\n", 5);//HAL_Delay(1000);//HAL_UART_Transmit_IT(&huart1, (uint8_t*)"received\r\n", 10);OLED_Clear();//OLED清零OLED_ShowString(0,4,"received:");OLED_ShowString(80,4,(u8 *)receivedData);// 延时3秒//HAL_Delay(3000);//replyBuffer = receivedData;if (strstr((const char *)receivedData, expectedReply) != NULL){// 重置接收,准备接收下一段内容reset_receive();// 收到期望的回复return HAL_OK;}// 重置接收,准备接收下一段内容reset_receive();return HAL_ERROR;}#if 0//等待wifi配网成功HAL_StatusTypeDef WaitConnected(){//uint32_t startTime = HAL_GetTick();//uint32_t elapsedTime = 0;int Connected = 0;//是否配网完成// 持续等待回复,直到收到配网成功的回复;当TimeOut_flag为2时说明超时了while ( 1 != Connected){HAL_UART_Receive_IT(&huart1, &rxBuffer[receivedIndex], 1);if(0 == stringMatched)//还未接收到数据,一直等待{OLED_Clear();//OLED清零OLED_ShowString(0,4,"000 wait Connect");// 延时3秒//HAL_Delay(3000);while( stringMatched == 0){ReceivedAll();//判断是否接收完所有字符串了}}if(1 == stringMatched){OLED_Clear();//OLED清零OLED_ShowString(0,0,"received:");OLED_ShowString(80,0,(u8 *)receivedData);// 延时3秒HAL_Delay(3000);if (strstr(receivedData, "ILOPEVENT:ILOP,CONNECTED") != NULL){OLED_Clear();//OLED清零OLED_ShowString(0,4,"Connect OK");// 延时3秒//HAL_Delay(3000);// 重置接收,准备接收下一段内容reset_receive();Connected = 1;return HAL_OK;//配网成功}// 重置接收,准备接收下一段内容reset_receive();}// 更新经过的时间//elapsedTime = HAL_GetTick() - startTime;}return HAL_TIMEOUT;}#endif//等待wifi配网成功HAL_StatusTypeDef WaitConnected(){//uint32_t startTime = HAL_GetTick();//uint32_t elapsedTime = 0;OLED_Clear();//OLED清零OLED_ShowString(0,4," waiting Connect");int Connected = 0;//是否配网完成// 持续等待回复,直到收到配网成功的回复;当TimeOut_flag为2时说明超时了while ( 1 != Connected){HAL_UART_Receive_IT(&huart1, &rxBuffer[receivedIndex], 1);if(0 != receivedLength)//收到数据了{//OLED_Clear();//OLED清零//OLED_ShowString(0,4,"000 wait Connect");// 延时3秒//HAL_Delay(3000);while( stringMatched == 0)//判断是否接收完数据,如果未接收完,则一直循环,直到接收完{ReceivedAll();//判断是否接收完所有字符串了}OLED_Clear();//OLED清零OLED_ShowString(0,0,"received:");OLED_ShowString(80,0,(u8 *)receivedData);// 延时3秒//HAL_Delay(3000);if (strstr((const char *)receivedData, "ILOPEVENT:ILOP,CONNECTED") != NULL){OLED_Clear();//OLED清零OLED_ShowString(0,4,"Connect OK");// 延时3秒//HAL_Delay(3000);// 重置接收,准备接收下一段内容reset_receive();Connected = 1;return HAL_OK;//配网成功}// 重置接收,准备接收下一段内容reset_receive();}}return HAL_TIMEOUT;}// 进入WiFi配网过程的函数HAL_StatusTypeDef WiFiConfigInit(){HAL_StatusTypeDef status;// 发送指令 "AT",直到收到的回复是OKstatus = sendCommandAndWait(atCommands[0], "OK");while (status != HAL_OK){OLED_Clear();//OLED清零OLED_ShowString(0,4,"AT Not OK");status = sendCommandAndWait("AT\r\n", "OK");}OLED_Clear();//OLED清零OLED_ShowString(0,4,"ATOK");// 延时10秒//HAL_Delay(10000);// 发送指令 "AT+ILOPAWSAP\r\n"status = sendCommandAndWait("AT+ILOPAWSAP\r\n", "OK");while (status != HAL_OK){OLED_Clear();//OLED清零OLED_ShowString(0,4,"SWAPNot OK");status = sendCommandAndWait("AT+ILOPAWSAP\r\n", "OK");}OLED_Clear();//OLED清零OLED_ShowString(0,4,"SWAP OK");// 延时10秒//HAL_Delay(10000);if(HAL_OK ==WaitConnected()){OLED_Clear();//OLED清零OLED_ShowString(0,4,"Connect OK");}else{OLED_Clear();//OLED清零OLED_ShowString(0,4,"Connect TimeOut");return HAL_TIMEOUT;}// 配网成功return HAL_OK;}void DeviceInit(){deviceParams.powerState = 0;}/*判断wifi是否断开,返回DISCONNECT 表示wifi断开;返回CONNECT表示wifi处于连接状态*/uint8_t wifi_isDisconnected(){uint8_t disConnected = DISCONNECT_FALSE;//默认没有断开if (strstr((const char *)receivedData, "ILOPEVENT:ILOP,CONNECTING") != NULL){OLED_Clear();//OLED清零OLED_ShowString(0,4,"wifi disconnect ");// 延时3秒//HAL_Delay(3000);// 重置接收,准备接收下一段内容reset_receive();disConnected = DISCONNECT_TRUE;//wifi断开}return disConnected;}void wifi_task(){HAL_UART_Receive_IT(&huart1, &rxBuffer[receivedIndex], 1);//if(0 == stringMatched)//还未接收到数据,一直等待if(0 != receivedIndex)//说明接收到消息了{//OLED_ShowString(0,4,"Recive date begin");// 延时3秒//HAL_Delay(3000);while( 0 == stringMatched){ReceivedAll();//判断是否接收完所有字符串了}OLED_Clear();//OLED清零OLED_ShowString(0,0,"received:");OLED_ShowString(80,0,(u8 *)receivedData);// 延时3秒//HAL_Delay(3000);if(DISCONNECT_TRUE == wifi_isDisconnected())//如果wifi断开了{OLED_Clear();//OLED清零OLED_ShowString(0,4,"wifi DisConnect ");// 延时3秒//HAL_Delay(3000);//while(HAL_OK != WaitConnected());WaitConnected();//等待wifi重连成功OLED_Clear();//OLED清零OLED_ShowString(0,4,"wifi recover ");// 延时3秒//HAL_Delay(3000);}else{OLED_Clear();//OLED清零OLED_ShowString(0,4,"wifi parse Task ");//HAL_Delay(3000);parseWiFiCommand((char *)receivedData);deviceControl();reset_receive();}}{OLED_Clear();//OLED清零OLED_ShowString(0,4,"wifi connect ");} }void parseWiFiCommand(const char* command){const char* keyword = "+ILOPEVENT:SETJSON,property,";const char* powerstateKeyword = "\"powerstate\":";const char* powerstateValue = NULL;// 检查指令是否以关键字开头if (strncmp(command, keyword, strlen(keyword)) != 0) {while(1){OLED_Clear();//OLED清零OLED_ShowString(0,4,"error 1");}//return;}// 定位到powerstate关键字的位置powerstateValue = strstr(command, powerstateKeyword);if (powerstateValue == NULL) {while(1){OLED_Clear();//OLED清零OLED_ShowString(0,4,"error 2");}//return;}// 解析powerstate的值powerstateValue += strlen(powerstateKeyword);int powerstate = *powerstateValue - '0';//将powerstateValue指针所指向的字符转换为整数,并将结果存储在powerstate变量中。*powerstateValue表示取指针所指向的字符,然后通过减去字符'0'的ASCII值,实现将字符转换为对应的整数值。// 根据powerstate设置state的值if (powerstate == 0) {deviceParams.powerState = 0;} else if (powerstate == 1) {deviceParams.powerState = 1;} else {while(1){OLED_Clear();//OLED清零OLED_ShowString(0,4,"error 3");}}}void deviceControl(){if(0 == deviceParams.powerState)HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_SET);//灯灭elseHAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_RESET);//灯亮}// 发送数据void sendWiFiData(const char* paramName, const char* paramValue) {// 构建发送数据的格式//sprintf(txBuffer, "+ILOPEVENT:SETJSON,%s,%d,{\"%s\":%s}\r\n", paramName, strlen(paramValue), paramName, paramValue);// 在这里实现串口发送功能,将txBuffer中的数据发送出去// 例如:HAL_UART_Transmit(&huart1, (uint8_t*)txBuffer, strlen(txBuffer), HAL_MAX_DELAY);}

笔记

记录几个开发中的细节:

1、单片机向wifi模块发送指令 AT+ILOPAWSAP\r\n进行配网
2、当单片机收到wifi模块返回的信息中,包含ILOPEVENT:ILOP,CONNECTED时,说明配网成功
3、当单片机收到wifi模块返回的信息中,包含ILOPEVENT:ILOP,CONNECTING时,说明wifi已经断开,正在重连
4、云端向EMW3080发送的控制指令,也就是单片机需要解析的指令,格式如下(以参数“开关状态”为例):

+ILOPEVENT:SETJSON,property,16,{"powerstate":0}+ILOPEVENT:SETJSON,property,16,{"powerstate":1}