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 */