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参考 用HAL库改写江科大的stm32入门例子-补充DHT11_江科大stm32安装hal库-CSDN博客

老夫上课的时候 ，这部份讲的比较多 ，出发点是 安利 “单总线”的具体使用。

这里无非是引入dht11 库，

使用前初始化 

然后通话dht11库的方法 读取数据 ，通过mqtt发布。

不多解释：

见代码：

#include "system.h"
#include "SysTick.h"
#include "led.h"         // 添加LED函数声明头文件
#include "usart.h"
#include "wifi_config.h"
#include "wifi_function.h"
#include <string.h>
#include "cJSON.h"
#include "dht11.h"// 声明外部变量
extern struct STRUCT_USARTx_Fram strEsp8266_Fram_Record;// 函数声明
void ProcessWiFiData(uint8_t *data, uint16_t length);
void HandleMQTTMessage(const char *topic, const char *message, const char *message_le);// 全局变量
char topic_id[20] = "topic911";
char sub_topic_id[20] = "topic108";
uint8_t wifi_rx_buffer[RX_BUF_MAX_LEN]; // 用于暂存接收数据的缓冲区
//delcare global variable for if opening and closing read data
bool read_data_flag = true; // 用于控制是否读取数据
// ========== 设备处理结构体定义 ==========
typedef enum {DEVICE_LED,DEVICE_MOTOR,DEVICE_UNKNOWN
} DeviceType;typedef struct {const char *device_name;        // 设备名称（JSON键名）DeviceType device_type;         // 设备类型枚举void (*handler)(const char *state); // 处理函数指针
} DeviceHandler;void data_pros()	//数据处理函数
{u8 temp;  	    u8 humi;u8 temp_buf[3],humi_buf[3];DHT11_Read_Data(&temp,&humi);temp_buf[0]=temp/10+0x30;	temp_buf[1]=temp%10+0x30;temp_buf[2]='\0';//LCD_ShowString(55,100,tftlcd_data.width,tftlcd_data.height,16,temp_buf);humi_buf[0]=humi/10+0x30;	humi_buf[1]=humi%10+0x30;humi_buf[2]='\0';//LCD_ShowString(55,130,tftlcd_data.width,tftlcd_data.height,16,humi_buf);printf("temperature=%d°C  humidity=%d%%RH\r\n",temp,humi);// publish data to MQTT topicif (ESP8266_MQTT_Public_key_Value(topic_id, "temperature", temp_buf)) {printf("Published temperature successfully!\r\n");} else {printf("Failed to publish temperature!\r\n");}if (ESP8266_MQTT_Public_key_Value(topic_id, "humidity", humi_buf)) {printf("Published humidity successfully!\r\n");} else {printf("Failed to publish humidity!\r\n");}}// ========== 设备处理函数实现 ==========
// LED处理函数（假设LED_Init()已在led.h中声明）
void LedHandler(const char *state) {if (strcmp(state, "on") == 0) {LED_ON(); // 假设LED_ON()在led.c中实现printf("Led turned on\r\n");} else if (strcmp(state, "off") == 0) {LED_OFF(); // 假设LED_OFF()在led.c中实现printf("Led turned off\r\n");} else {printf("Invalid state for LED: %s\r\n", state);}
}// Motor处理函数（需根据实际硬件实现）
void MotorHandler(const char *state) {if (strcmp(state, "on") == 0) {// 这里添加电机启动代码printf("Motor started\r\n");} else if (strcmp(state, "off") == 0) {// 这里添加电机关闭代码printf("Motor stopped\r\n");} else {printf("Invalid state for Motor: %s\r\n", state);}
}// 设备处理注册表（可扩展）
DeviceHandler device_handlers[] = {{"Led", DEVICE_LED, LedHandler},{"Motor", DEVICE_MOTOR, MotorHandler},{NULL, DEVICE_UNKNOWN, NULL} // 结束标志
};// ========== JSON解析函数扩展 ==========
void parse_json_message(const char *message) {cJSON *root;cJSON *item; // 修正变量名，避免未使用警告if (message == NULL) {printf("错误:传入的JSON字符串为空\n");return;}root = cJSON_Parse(message);if (!root) {printf("JSON格式错误:%s\n", cJSON_GetErrorPtr());return;}// 遍历JSON对象中的键值对（修正变量声明位置）item = root->child; // 变量声明已在代码块开头，此处直接使用while (item) {const char *device_name = item->string;const char *state = item->valuestring;// 查找设备处理器DeviceHandler *handler = device_handlers;while (handler->device_name) {if (strcmp(device_name, handler->device_name) == 0) {handler->handler(state);break;}handler++;}if (!handler->device_name) { // 未找到处理器printf("Unknown device: %s\r\n", device_name);}item = item->next;}cJSON_Delete(root); // 释放内存
}int main() {// 初始化部分保持不变...SysTick_Init(72);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);USART1_Init(9600);LED_Init(); // 假设LED初始化函数在led.c中// Motor_Init(); // 如有电机初始化需添加WiFi_Config();printf("Hello, world!\r\n");printf("\r\n====================================\r\n");printf("STM32 + ESP8266 JSON Command Handler\r\n");printf("Supported devices: Led, Motor\r\n");printf("====================================\r\n");// 初始化WiFi和MQTTESP8266_STA_TCP_Client_MQTT();if (ESP8266_Set_MQTT_Sub(sub_topic_id, "0")) {printf("\r\nSubscribed to MQTT topic successfully!\r\n");} else {printf("\r\nFailed to subscribe to MQTT topic!\r\n");}if (ESP8266_MQTT_Public_key_Value(topic_id, "aa", "01")) {printf("\r\nPublished MQTT message successfully!\r\n");} else {printf("\r\nFailed to publish MQTT message!\r\n");}while(DHT11_Init())	//检测DS18B20是否纯在{//LCD_ShowString(130,50,tftlcd_data.width,tftlcd_data.height,16,"Error   ");printf("DHT11 Check Error!\r\n");delay_ms(500);		}//LCD_ShowString(130,50,tftlcd_data.width,tftlcd_data.height,16,"Success");printf("DHT11 Check OK!\r\n");while (1) {// 处理WiFi数据if (strEsp8266_Fram_Record.InfBit.FramFinishFlag) {uint16_t data_len; // 声明在代码块开头__disable_irq();   // 进入临界区data_len = strEsp8266_Fram_Record.InfBit.FramLength;// 复制数据到本地缓冲区memcpy(wifi_rx_buffer, strEsp8266_Fram_Record.Data_RX_BUF, data_len);wifi_rx_buffer[data_len] = '\0'; // 添加字符串结束符// 清除标志和计数器strEsp8266_Fram_Record.InfBit.FramFinishFlag = 0;strEsp8266_Fram_Record.InfBit.FramLength = 0;__enable_irq(); // 退出临界区// 处理接收到的数据ProcessWiFiData(wifi_rx_buffer, data_len);}// 其他业务逻辑...//温湿度if(read_data_flag) { // 如果开启读取数据标志printf("\r\nReading DHT11 data...\r\n");data_pros();  	 //读取一次DHT11数据最少要大于100m} delay_ms(200);}// 添加换行符避免警告printf("\n");
}// 处理WiFi数据的函数
void ProcessWiFiData(uint8_t *data, uint16_t length) {// 示例：直接打印原始数据printf("[RAW DATA] %s\r\n", data);// 检查是否是MQTT消息if (strstr((char *)data, "+MQTTSUBRECV:") != NULL) {// 解析MQTT消息char *topic_start = strchr((char *)data, ',') + 1;char *msg_length_start = strchr(topic_start, ',') + 1;char *msg_start = strchr(msg_length_start, ',') + 1;// 提取主题和消息char topic[32] = {0};char msg_length[32] = {0};char message[128] = {0};sscanf(topic_start, "%[^,]", topic);sscanf(msg_length_start, "%[^,]", msg_length);sscanf(msg_start, "%[^,]", message);HandleMQTTMessage(topic, message, msg_length);}// 可以添加其他协议处理...
}// 处理MQTT消息
void HandleMQTTMessage(const char *topic, const char *message, const char *message_length) {printf("Received MQTT message:\r\n");printf("Topic: %s\r\n", topic);         // topic_idprintf("Message: %s\r\n\r\n", message); // json 字符串// todo: 根据实际需求处理消息parse_json_message(message); // 解析JSON消息
}
// 添加换行符避免警告

运行效果：

完整代码