STM32CubeMX-H7-20-ESP8266通信(下)-双单片机各控制一个ESP8266实现通信
前言
上一篇我们已经能够使用单片机去实现物联网了,后面单片机的原理也是差不多,建议把上篇和中篇都看过实践一遍后,下篇的思路一看就能明白
因为上篇和中篇的思路我已经讲得很清楚了,本篇直接给代码,不做讲解。
用法和中篇最后说的一样
esp8266.c
#include "esp8266.h"
#include "tim.h"
#include "gpio.h"
#include "usart.h"
#include "stdio.h"
#include "string.h"/*** @brief ESP8266通信相关的全局变量*/
uint8_t esp8266_buffer[128],esp8266_buff[1],esp8266_len=0,esp8266_flag=0;
uint16_t esp8266_time=0;
char esp8266_wait[100];/*** @brief TCP服务器连接模式的配置参数*/
const char ESP8266_WIFI_SSID[]="lty2";
const char ESP8266_WIFI_PassWord[]="2395832518";
const char ESP8266_WIFI_TCP_IP[]="112.125.89.8";
const char ESP8266_WIFI_TCP_PORT[]="42137";/*** @brief 主机模式的配置参数*/
const char ESP8266_WIFI_SSID_main[]="ESP8266_A";
const char ESP8266_WIFI_PassWord_main[]="";
char ESP8266_WIFI_TCP_IP_main[20]="192.168.4.1";
uint8_t esp8266_connect_main_port=0;/*** @brief 从机模式的配置参数*/
const char ESP8266_WIFI_SSID_other[]="ESP8266_A";
const char ESP8266_WIFI_PassWord_other[]="";
char ESP8266_WIFI_TCP_IP_other[20]="192.168.4.1";
uint8_t esp8266_connect_other_port=80;/*---------------------------- 初始化相关函数 ----------------------------*//*** @brief ESP8266模块初始化* @note 启动定时器中断和串口接收中断*/
void ESP8266_Init(void)
{HAL_TIM_Base_Start_IT(ESP8266_TIM);HAL_UART_Receive_IT(ESP8266_UART,(uint8_t *)esp8266_buff,1);
}/*---------------------------- 连接模式函数 ----------------------------*//*** @brief TCP服务器连接模式的AT命令处理* @param cmd: 命令类型(0-8)* @param leng: 发送数据长度(仅在cmd=7时使用)* @note 处理TCP服务器连接相关的AT命令序列*/
void ESP8266_TCP_CONNECT(uint8_t cmd,uint16_t leng)
{char buffer[100];switch(cmd){case 0:sprintf(buffer,"AT+RST\r\n");sprintf(esp8266_wait,"OK"); break;case 1:sprintf(buffer,"AT\r\n");sprintf(esp8266_wait,"OK");break; case 2:sprintf(buffer,"AT+CWMODE=1\r\n");sprintf(esp8266_wait,"OK");break; case 3:sprintf(buffer,"AT+CWJAP=\"%s\",\"%s\"\r\n",ESP8266_WIFI_SSID,ESP8266_WIFI_PassWord);sprintf(esp8266_wait,"WIFI GOT IP");break; case 4:sprintf(buffer,"AT+CWJAP?\r\n");sprintf(esp8266_wait,"OK");break; case 5:sprintf(buffer,"AT+CIPMUX=0\r\n");sprintf(esp8266_wait,"OK");break; case 6:sprintf(buffer,"AT+CIPSTART=\"TCP\",\"%s\",%s\r\n",ESP8266_WIFI_TCP_IP,ESP8266_WIFI_TCP_PORT);sprintf(esp8266_wait,"OK");break; case 7:sprintf(buffer,"AT+CIPSEND=%d\r\n",leng);sprintf(esp8266_wait,"");break; case 8:sprintf(buffer,"");sprintf(esp8266_wait,"SEND OK");break;}ESP8266_commom(buffer);
}/*** @brief 主机模式的AT命令处理* @param cmd: 命令类型(0-11)* @param leng: 发送数据长度(仅在cmd=10时使用)* @note 处理ESP8266作为主机时的AT命令序列*/
void ESP8266_CONNECT_main(uint8_t cmd,uint16_t leng)
{char buffer[100];switch(cmd){case 0:sprintf(buffer,"AT+RST\r\n");sprintf(esp8266_wait,"OK"); break;case 1:sprintf(buffer,"AT\r\n");sprintf(esp8266_wait,"OK");break; case 2:sprintf(buffer,"AT+CWMODE=2\r\n");sprintf(esp8266_wait,"OK");break; case 3:sprintf(buffer,"AT+CWSAP=\"%s\",\"%s\",1,0\r\n",ESP8266_WIFI_SSID_main,ESP8266_WIFI_PassWord_main);sprintf(esp8266_wait,"OK");break; case 4:sprintf(buffer,"AT+CIFSR\r\n");sprintf(esp8266_wait,"OK");break; case 5:sprintf(buffer,"");sprintf(esp8266_wait,"STA_CONNECTED");break; case 6:sprintf(buffer,"AT+CIPMUX=1\r\n");sprintf(esp8266_wait,"OK");break; case 7:sprintf(buffer,"AT+CIPSERVER=1,80\r\n");sprintf(esp8266_wait,"OK");break; case 8:sprintf(buffer,"AT+CIFSR\r\n");sprintf(esp8266_wait,"OK");break;case 9:sprintf(buffer,"+++\r\n");sprintf(esp8266_wait,"CONNECT");break;case 10:sprintf(buffer,"AT+CIPSEND=%d,%d\r\n",esp8266_connect_main_port,leng);sprintf(esp8266_wait,"");break;case 11:sprintf(buffer,"");sprintf(esp8266_wait,"SEND OK");break;}ESP8266_commom(buffer);
}/*** @brief 从机模式的AT命令处理* @param cmd: 命令类型(0-7)* @param leng: 发送数据长度(仅在特定cmd时使用)* @note 处理ESP8266作为从机时的AT命令序列*/
void ESP8266_CONNECT_Other(uint8_t cmd,uint16_t leng)
{char buffer[100];switch(cmd){case 0:sprintf(buffer,"AT+RST\r\n");sprintf(esp8266_wait,"OK"); break;case 1:sprintf(buffer,"AT\r\n");sprintf(esp8266_wait,"OK");break; case 2:sprintf(buffer,"AT+CWMODE=1\r\n");sprintf(esp8266_wait,"OK");break; case 3:sprintf(buffer,"AT+CWJAP=\"%s\",\"%s\"\r\n",ESP8266_WIFI_SSID_other,ESP8266_WIFI_PassWord_other);sprintf(esp8266_wait,"WIFI GOT IP");break; case 4:sprintf(buffer,"AT+CIPMUX=0\r\n");sprintf(esp8266_wait,"OK");break; case 5:sprintf(buffer,"AT+CIPSTART=\"TCP\",\"%s\",%d\r\n",ESP8266_WIFI_TCP_IP_other,esp8266_connect_other_port);sprintf(esp8266_wait,"CONNECT");break; case 6:sprintf(buffer,"AT+CIPMODE=1\r\n");sprintf(esp8266_wait,"OK");break; case 7:sprintf(buffer,"AT+CIPSEND\r\n");sprintf(esp8266_wait,"OK");break; }ESP8266_commom(buffer);
}/*---------------------------- 连接控制函数 ----------------------------*//*** @brief ESP8266通用AT命令发送和等待响应* @param cmd: AT命令字符串* @note 发送AT命令并等待预期响应,超时会重试*/
void ESP8266_commom(const char *cmd)
{HAL_UART_Transmit(ESP8266_UART,(uint8_t *)cmd,strlen(cmd),100);esp8266_flag=0;while (esp8266_flag==0){if (esp8266_time>1000){HAL_UART_Transmit(ESP8266_UART,(uint8_t *)cmd,strlen(cmd),100);esp8266_time=0;}}
}/*** @brief 连接到TCP服务器的完整初始化过程* @note 按顺序执行TCP连接所需的AT命令序列*/
void ESP8266_CONNECT_TO_TCP()
{for(uint8_t i = 0; i < 7; i++){ ESP8266_TCP_CONNECT(i,0);printf("cmd=%d\r\n",i);HAL_Delay(500);}
}/*** @brief 切换ESP8266为主机模式* @note 执行主机模式初始化所需的AT命令序列*/
void ESP8266_change_to_main()
{for(uint8_t i = 0; i < 10; i++){ESP8266_CONNECT_main(i,0);printf("main cmd=%d\r\n",i);HAL_Delay(500);}
}/*** @brief 切换ESP8266为从机模式* @note 执行从机模式初始化所需的AT命令序列*/
void ESP8266_change_to_other()
{for(uint8_t i = 0; i < 8; i++){ESP8266_CONNECT_Other(i,0);printf("other cmd=%d\r\n",i);HAL_Delay(500);}
}/*---------------------------- 数据发送函数 ----------------------------*//*** @brief 向TCP服务器发送数据* @param data: 要发送的数据字符串* @note 使用TCP服务器连接模式发送数据*/
void ESP8266_send_TCP(const char *data)
{ESP8266_TCP_CONNECT(7,strlen(data));HAL_UART_Transmit(ESP8266_UART,(uint8_t *)data,strlen(data),100);ESP8266_TCP_CONNECT(8,0);
}/*** @brief 主机模式下发送数据* @param data: 要发送的数据字符串* @note 使用主机模式发送数据*/
void ESP8266_main_send_data(const char *data)
{ESP8266_CONNECT_main(10,strlen(data));HAL_UART_Transmit(ESP8266_UART,(uint8_t *)data,strlen(data),100);ESP8266_CONNECT_main(11,0);
}/*** @brief 从机模式下发送数据* @param data: 要发送的数据字符串* @note 使用从机模式发送数据*/
void ESP8266_other_send_data(const char *data)
{HAL_UART_Transmit(ESP8266_UART,(uint8_t *)data,strlen(data),100);
}/*---------------------------- 数据处理函数 ----------------------------*//*** @brief 检查字符串是否包含特定子串* @param str: 要检查的字符串* @param substr: 要查找的子串* @retval 1: 包含子串, 0: 不包含子串*/
int contains_OK(const char *str, const char *substr) {if (strstr(str, substr) != NULL) {return 1; }return 0;
}/*** @brief ESP8266接收数据处理* @param 无* @note 处理接收缓冲区中的数据,包括响应确认和特殊数据处理*/
void ESP8266_Change()
{printf("%s\r\n",esp8266_buffer);if(contains_OK(esp8266_buffer,esp8266_wait)){esp8266_flag=1;}if(contains_OK(esp8266_buffer,"IPD"))ESP8266_IPD(esp8266_buffer);if(contains_OK(esp8266_buffer,"APIP"))ESP8266_Check_IP(esp8266_buffer);
}/*** @brief 处理IPD数据* @param data: 接收到的IPD数据* @note 解析并处理+IPD格式的数据*/
void ESP8266_IPD(const char *data)
{char *p=data;uint8_t leng=0;char hand[256];if(hand[7]!=esp8266_connect_main_port){p+=6; while (*p != ':') {leng = leng * 10 + *p - '0';p++; }p++; strncpy(hand, p, leng); hand[leng] = '\0'; printf("hand:%s\r\n", hand);}else{while (*p!= ':'){p++;}p++;while (*p!='\0') {hand[leng++] = *p;p++;}hand[leng] = '\0';printf("hand:%s\r\n", hand);}
}/*** @brief 解析并保存ESP8266的IP地址* @param data: 包含IP信息的字符串* @note 从CIFSR响应中提取AP模式的IP地址*/
void ESP8266_Check_IP(const char *data)
{const char *p = data;uint8_t leng = 0;p = strstr(p, "+CIFSR:APIP,\"");if (p == NULL) {printf("APIP string not found\r\n");return;}p += strlen("+CIFSR:APIP,\"");while (*p != '\"' && leng < sizeof(ESP8266_WIFI_TCP_IP_main) - 1) {ESP8266_WIFI_TCP_IP_main[leng++] = *p;p++;}ESP8266_WIFI_TCP_IP_main[leng] = '\0';printf("IP:%s\r\n", ESP8266_WIFI_TCP_IP_main);
}/*** @brief 从字符串中提取端口号* @param data: 包含端口信息的字符串* @retval 提取的端口号,失败返回0*/
uint8_t extract_port_number(const char *data) {char temp[20];strncpy(temp, data, sizeof(temp) - 1);temp[sizeof(temp) - 1] = '\0';char *token = strtok(temp, ",");if (token != NULL) {return (uint8_t)atoi(token);}return 0;
}/*---------------------------- 中断和回调函数 ----------------------------*//*** @brief ESP8266串口接收中断处理* @note 处理串口接收到的数据*/
void ESP8266_UART_Handler(void)
{esp8266_buffer[esp8266_len++]=esp8266_buff[0];esp8266_time=0;HAL_UART_Receive_IT(ESP8266_UART,(uint8_t *)esp8266_buff,1);
}/*** @brief ESP8266定时器中断处理* @note 处理接收超时和数据处理*/
void ESP8266_Time(void)
{esp8266_time++;if((esp8266_time>10)&&(esp8266_len>0)){esp8266_buffer[esp8266_len]=0;ESP8266_Change();memset(esp8266_buffer, '\0', sizeof(esp8266_buffer));esp8266_len=0;esp8266_time=0; }
}/*** @brief 串口接收完成回调函数* @param huart: 串口句柄* @note 处理USART2的接收中断*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huart->Instance == USART2) { ESP8266_UART_Handler();}
}/*** @brief 定时器周期回调函数* @param htim: 定时器句柄* @note 处理TIM2的定时中断*/
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance==TIM2){ESP8266_Time();}
}
esp8266.h
#ifndef HC_TR_H
#define HC_TR_H#include "main.h"/*** @brief ESP8266硬件接口定义*/
#define ESP8266_UART &huart2 /* ESP8266使用的串口 */
#define ESP8266_TIM &htim2 /* ESP8266使用的定时器 *//*---------------------------- 初始化相关函数 ----------------------------*/
void ESP8266_Init(void);/*---------------------------- 连接模式函数 ----------------------------*/
void ESP8266_TCP_CONNECT(uint8_t cmd, uint16_t leng);
void ESP8266_CONNECT_main(uint8_t cmd, uint16_t leng);
void ESP8266_CONNECT_Other(uint8_t cmd, uint16_t leng);/*---------------------------- 连接控制函数 ----------------------------*/
void ESP8266_commom(const char *cmd);
void ESP8266_CONNECT_TO_TCP(void);
void ESP8266_change_to_main(void);
void ESP8266_change_to_other(void);/*---------------------------- 数据发送函数 ----------------------------*/
void ESP8266_send_TCP(const char *data);
void ESP8266_main_send_data(const char *data);
void ESP8266_other_send_data(const char *data);/*---------------------------- 数据处理函数 ----------------------------*/
int contains_OK(const char *str, const char *substr);
void ESP8266_Change(void);
void ESP8266_IPD(const char *data);
void ESP8266_Check_IP(const char *data);/*---------------------------- 中断和回调函数 ----------------------------*/
void ESP8266_UART_Handler(void);
void ESP8266_Time(void);#endif /* HC_TR_H */
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