材料：
STM32F103、ESP8266、串口
第三章介绍了利用串口调试助手+AT指令连接阿里云平台的，现在用代码去实现其功能，利用STM32的串口2跟WIFI模块进行数据通信即可。这里我实现的功能是：在阿里云平台添加一个bool开关的模型，发送开和关的命令去控制STM32上的LED灯的亮灭。创建阿里云平台的模型在第二章，可点击主页观看。
下面是STM32部分的代码：
<---------------------wifi.h----------------------->
#ifndef __WIFI_H#define __WIFI_H#include "stm32f10x.h"#include "usart.h"#include "delay.h"#include "string.h"void WIFI_Init(void);void WIFI_Rst(void);void Setting_Connect_Work(char *type);void Login_URL(void);void WIFI_Connect(char *name,char *password);void USER_Connect(void);void Client_Connect(void);void Connect_Aliyun_Server(void);void Client_Subscribe(void);void wait_OK(void);#endif
<---------------------wifi.c----------------------->
#include "wifi.h"void WIFI_Init(void){WIFI_Rst();Setting_Connect_Work("1");wait_OK();Login_URL();wait_OK();WIFI_Connect("\"YCF\"","\"ycf88888888\"");wait_OK();USER_Connect();wait_OK();Client_Connect();wait_OK();Connect_Aliyun_Server();wait_OK();Client_Subscribe();wait_OK();}/*********************重启WIFI模块*****************************/void WIFI_Rst(void){USART1TxStr("重启模块...\r\n"); USART2TxStr("AT+RST\r\n");Delay_Ms(1000); //WIFI重启需要事件Delay_Ms(1000);Delay_Ms(1000);Delay_Ms(1000);Delay_Ms(1000);Delay_Ms(1000);CLR_Buf2();//清除串口2接收缓存Flag_usart2_receive_OK = 0;}/*******************设置WIFI工作模式****************************//1 STA模式/2 AP模式/3 STA和AP模式/**************************************************************/void Setting_Connect_Work(char *type){char wifi_mode_buf[13] = {"AT+CWMODE=x\r\n"};wifi_mode_buf[10] = *type;USART1TxStr("设置工作模式...\r\n");USART2TxStr(wifi_mode_buf);}/*********************登录网址******************************/void Login_URL(void){char login_url[100] = {"AT+CIPSNTPCFG=1,8,\"\"\r\n"};USART1TxStr("连接阿里云服务器...\r\n");USART2TxStr(login_url);}/*********************连接WIFI******************************/void WIFI_Connect(char *name,char *password){char wifi_connect_buf[100] = {"AT+CWJAP="};strcat(wifi_connect_buf,name);strcat(wifi_connect_buf,",");strcat(wifi_connect_buf,password);strcat(wifi_connect_buf,"\r\n");USART1TxStr("连接已知WiFi...\r\n");USART2TxStr(wifi_connect_buf);}/*********************用户设备连接*******************************/void USER_Connect(void){char user_connect_buf[200] = {"AT+MQTTUSERCFG=0,1,\"NULL\",\"C6T6&gavk88e3djY\",\"64678A30225AB875CA6A6C323DAA575A3B283AB7\",0,0,\"\"\r\n"};USART1TxStr("用户设备连接...\r\n");USART2TxStr(user_connect_buf);}/*********************连接客户端*******************************/void Client_Connect(void){char client_connect_buf[100] = {"AT+MQTTCLIENTID=0,\"112233|securemode=3\\,signmethod=hmacsha1\\,timestamp=456|\"\r\n"};USART1TxStr("连接客户端...\r\n");USART2TxStr(client_connect_buf);}/*********************连接阿里云服务器*************************/void Connect_Aliyun_Server(void){char connect_server_buf[100] = {"AT+MQTTCONN=0,\"gavk88e3djY.iot-as--\",1883,1\r\n"};USART1TxStr("连接阿里云服务器...\r\n");USART2TxStr(connect_server_buf);}/*********************客户端订阅*************************/void Client_Subscribe(void){char client_subscribe_buf[100] = {"AT+MQTTSUB=0,\"/sys/gavk88e3djY/C6T6/thing/service/property/set\",1\r\n"};USART1TxStr("客户端订阅消息...\r\n");USART2TxStr(client_subscribe_buf);}void wait_OK(void){while(!Flag_usart2_receive_OK);//等待接收到OK字符串Flag_usart2_receive_OK = 0;CLR_Buf2();//清除串口2接收缓存}
<---------------------主函数部分----------------------->
#include <string.h>#include "stm32f10x.h" #include "led.h"#include "delay.h"#include "usart.h" #include "wifi.h"int main(void) {//uint8_t subStr_len;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2：2位抢占优先级，2位响应优先级Usart1_Init(115200);Usart2_Init(115200);LED_Init();Delay_Init();USART1TxStr("this is wifi test!!!\r\n");WIFI_Init();while(1) //主循环{if(Flag_Usart2_Receive == 1){Flag_Usart2_Receive = 0;USART1TxStr(USART2_RX_BUF);if(USART2_RX_BUF[156] == '1')LED0_OFF;if(USART2_RX_BUF[156] == '0')LED0_ON;CLR_Buf2();}Delay_Ms(1000);}}
<---------------------串口2中断接收处理----------------------->
void USART2_IRQHandler(void)//串口2中断服务程序{u8 Res;if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //接收中断{Res =USART_ReceiveData(USART2);//读取接收到的数据USART2_RX_BUF[USART2_RX_STA]=Res;if(USART2_RX_BUF[USART2_RX_STA] == 'K'){if(USART2_RX_BUF[USART2_RX_STA - 1] == 'O'){Flag_usart2_receive_OK = 1;}}else {Flag_Usart2_Receive = 1;}USART2_RX_STA++;if(USART2_RX_STA > (USART2_REC_LEN - 1))USART2_RX_STA = 0;}}
实现效果如下：
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