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Micro-controllers, wireless transmission and database
ESP01 with STM32 using STM32CubeIDE
Prerequisites
This project assumes you have already installed STM32CubeIDE. You need to have previously done a basic blink sketch with blue-pill using STM32CubeIDE. I have made a complete video from installing STM32CubeIDE to LED blink program. You can watch it by clicking this link. https://www.youtube.com/watch?v=kXg467nVd_A
Wiring Diagram
STM32CubeIDE Settings
Enable USART1 asynchronous
Parameter Settings --> Basic Parameters --> Baud rate 115200
Set PC13 to GPIO_Output
Additional code on top of STM32CubeIDE generated code
/* USER CODE BEGIN Includes */ #include "string.h" #include "stdio.h" /* USER CODE END Includes */ /* USER CODE BEGIN 2 */ uint8_t rxBuffer[512] = {0}; uint8_t ATisOK; int channel; int onoff; int led = 1; char ATcommand[64]; char ATcommandB[1024]; char ATcommandN[100]; char ATcommandF[100]; char ATcommandT[16]; sprintf(ATcommandB,"<!DOCTYPE html><html>\n<head>\n\ <title>STM32 - ESP8266</title>\n<link href=\"data:image/x-icon;base64,\ A\" rel=\"icon\" type=\"image/x-icon\"><style>\nhtml {\ display: inline-block; margin: 0px auto; text-align: center;}\n\ body{margin-top: 50px;}\n.button {display: block;\n\ width: 70px;\nbackground-color: #008000;\nborder: none;\ncolor: white;\n\ padding: 14px 28px;\ntext-decoration: none;\nfont-size: 24px;\n\ margin: 0px auto 36px; \nborder-radius: 5px;}\n\ .button-on {background-color: #008000;}\n.button-on:active\ {background-color: #008000;}\n.button-off {background-color: #808080;}\n\ .button-off:active {background-color: #808080;}\n\ p {font-size: 14px;color: #808080;margin-bottom: 20px;}\n\ </style>\n</head>\n<body>\n<h1>STM32 - ESP8266</h1>"); sprintf(ATcommandN,"<p>Light is currently on\ </p><a class=\"button button-off\" href=\"/lightoff\">OFF</a>"); sprintf(ATcommandF,"<p>Light is currently off\ </p><a class=\"button button-on\" href=\"/lighton\">ON</a>"); sprintf(ATcommandT,"</body></html>"); int countB = strlen(ATcommandB); int countN = strlen(ATcommandN); int countF = strlen(ATcommandF); int countT = strlen(ATcommandT); sprintf(ATcommand,"AT+RST\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); HAL_Delay(500); ATisOK = 0; while(!ATisOK){ sprintf(ATcommand,"AT+CWMODE_CUR=2\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"OK")){ ATisOK = 1; } HAL_Delay(500); } ATisOK = 0; while(!ATisOK){ sprintf(ATcommand,"AT+CWSAP_CUR=\"STM32\",\"12345678\",1,3,4,0\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"OK")){ ATisOK = 1; } HAL_Delay(500); } ATisOK = 0; while(!ATisOK){ sprintf(ATcommand,"AT+CIPAP_CUR=\"192.168.51.1\"\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"OK")){ ATisOK = 1; } HAL_Delay(500); } ATisOK = 0; while(!ATisOK){ sprintf(ATcommand,"AT+CIPMUX=1\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"OK")){ ATisOK = 1; } HAL_Delay(500); } ATisOK = 0; while(!ATisOK){ sprintf(ATcommand,"AT+CIPSERVER=1,80\r\n"); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"OK")){ ATisOK = 1; } HAL_Delay(500); } /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Receive (&huart1, rxBuffer, 512, 1000); if(strstr((char *)rxBuffer,"+IPD,0")) channel = 0; else if(strstr((char *)rxBuffer,"+IPD,1")) channel = 1; else if(strstr((char *)rxBuffer,"+IPD,2")) channel = 2; else if(strstr((char *)rxBuffer,"+IPD,3")) channel = 3; else if(strstr((char *)rxBuffer,"+IPD,4")) channel = 4; else if(strstr((char *)rxBuffer,"+IPD,5")) channel = 5; else if(strstr((char *)rxBuffer,"+IPD,6")) channel = 6; else if(strstr((char *)rxBuffer,"+IPD,7")) channel = 7; else channel = 100; if(strstr((char *)rxBuffer,"GET /lighton")) onoff = 0; else if(strstr((char *)rxBuffer,"GET /lightoff")) onoff = 1; else onoff = led; if(channel<8 && onoff == 1) { HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_SET); led = 1; sprintf(ATcommand,"AT+CIPSEND=%d,%d\r\n",channel,countB+countF+countT); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); if(strstr((char *)rxBuffer,">")) { memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandB,countB,1000); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandF,countF,1000); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandT,countT,1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); } sprintf(ATcommand,"AT+CIPCLOSE=%d\r\n",channel); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); channel=100; } else if(channel<8 && onoff == 0) { HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET); led = 0; sprintf(ATcommand,"AT+CIPSEND=%d,%d\r\n",channel,countB+countN+countT); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); if(strstr((char *)rxBuffer,">")) { memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandB,countB,1000); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandN,countN,1000); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommandT,countT,1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); } sprintf(ATcommand,"AT+CIPCLOSE=%d\r\n",channel); memset(rxBuffer,0,sizeof(rxBuffer)); HAL_UART_Transmit(&huart1,(uint8_t *)ATcommand,strlen(ATcommand),1000); HAL_UART_Receive (&huart1, rxBuffer, 512, 100); channel=100; } /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */