SEND DATA TO SERVER with STM32 AND ESP8266-12F
PROJECT DETAIL
Hello there,
I will explain how to send a sample counter variable to our remote server with stm32 and esp8266-12F.
Since I have a STM32F411VE-DISC card, I will continue with this, you can use whatever you have.
Circuit diagram:
First, we open STM32CubeIDE, choose File / New / Stm32 Projects and start a new project.
We select the MCU from the page that appears.
After choosing our MCU, we come across our project.
We choose Serial Wire in the System Core / System / Debug part, which should be done in each project.
Let's do the other custom settings step by step;
1-We adjust the clock.
2-We adjust our USART settings.
3-We are doing the gpio setting. There will be 1 led here, this led will flash when it sends data.
Let's open our main.h file and write the necessary codes.
#include "main.h" #include #include #include "stm32f4xx_hal_uart.h" #define Wifi_name "Wifi-name" #define Wifi_pass "Wifi-pass" #define Server "Server" /*example : muharremarslan.com or 192.168.1.2*/ char Tx_buffer[250]; char Rx_buffer[500]; int Rx_indx; char *read; UART_HandleTypeDef huart1; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART1_UART_Init(void); void ESP8266_INIT(); void Send_data(int32_t value); void clear_Rxbuffer(); int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART1_UART_Init(); /*Send ESP8266 commands*/ ESP8266_INIT(); while (1) { int cnt; Send_data(cnt++); /*Our meter data to be sent */ HAL_Delay(5000); } } /* Clear Rx_Buffer */ void clear_Rxbuffer() { for (int i = 0; i < 500; i++) Rx_buffer[i] = 0; Rx_indx = 0; } /* Esp8266 start */ void ESP8266_INIT() { sprintf(Tx_buffer, "AT+RST\r\n"); HAL_UART_Transmit_IT(&huart1, (uint8_t*) Tx_buffer, strlen(Tx_buffer)); HAL_Delay(3000); clear_Rxbuffer(); do { sprintf(Tx_buffer, "AT\r\n"); HAL_UART_Transmit_IT(&huart1, (uint8_t*) Tx_buffer, strlen(Tx_buffer)); HAL_Delay(500); read = strstr(Rx_buffer, "OK"); } while (read == NULL); clear_Rxbuffer(); do { sprintf(Tx_buffer, "AT+CWMODE=1\r\n"); HAL_UART_Transmit_IT(&huart1, (uint8_t*) Tx_buffer, strlen(Tx_buffer)); HAL_Delay(500); read = strstr(Rx_buffer, "OK"); } while (read == NULL); clear_Rxbuffer(); char str[100]; do { strcpy(str, "AT+CWJAP=\""); strcat(str, Wifi_name); strcat(str, "\",\""); strcat(str, Wifi_pass); strcat(str, "\"\r\n"); sprintf(Tx_buffer, "%s", str); HAL_UART_Transmit_IT(&huart1, (uint8_t*) Tx_buffer, strlen(Tx_buffer)); HAL_Delay(6000); read = strstr(Rx_buffer, "OK"); } while (read == NULL); clear_Rxbuffer(); } /* Esp8266 send data */ void Send_data(int32_t value) { char local_txA[200]; char local_txB[50]; int len; HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET); clear_Rxbuffer(); do { sprintf(Tx_buffer, "AT+CIPSTART=\"TCP\",\"%s\",80\r\n", Server); HAL_UART_Transmit_IT(&huart1, (uint8_t*) Tx_buffer, strlen(Tx_buffer)); HAL_Delay(100); read = strstr(Rx_buffer, "CONNECT"); } while (read == NULL); clear_Rxbuffer(); do { sprintf(local_txA, "GET /valua.php?value=%ld HTTP/1.0\r\nHost: %s\r\n\r\n", value, Server); len = strlen(local_txA); sprintf(local_txB, "AT+CIPSEND=%d\r\n", len); HAL_UART_Transmit_IT(&huart1, (uint8_t*) local_txB, strlen(local_txB)); HAL_Delay(100); read = strstr(Rx_buffer, ">"); } while (read == NULL); HAL_UART_Transmit_IT(&huart1, (uint8_t*) local_txA, strlen(local_txA)); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_RESET); } void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = { 0 }; RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 }; __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 7; RCC_OscInitStruct.PLL.PLLN = 336; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; RCC_OscInitStruct.PLL.PLLQ = 8; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK) { Error_Handler(); } } static void MX_USART1_UART_Init(void) { huart1.Instance = USART1; huart1.Init.BaudRate = 115200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart1) != HAL_OK) { Error_Handler(); } } static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = { 0 }; __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_RESET); GPIO_InitStruct.Pin = GPIO_PIN_12; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOD, &GPIO_InitStruct); } void Error_Handler(void) { } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */
Then, let's open the Stm32f4xx_it.c file and write the necessary codes.
#include "main.h" #include "stm32f4xx_it.h" char Rx_data[1]; extern UART_HandleTypeDef huart1; extern char Rx_buffer[500]; extern int Rx_indx; void NMI_Handler(void) { } void HardFault_Handler(void) { while (1) { } } void MemManage_Handler(void) { while (1) { } } void BusFault_Handler(void) { while (1) { } } void UsageFault_Handler(void) { while (1) { } } void SVC_Handler(void) { } void DebugMon_Handler(void) { } void PendSV_Handler(void) { } void SysTick_Handler(void) { HAL_IncTick(); } void USART1_IRQHandler(void) { HAL_UART_IRQHandler(&huart1); uint8_t i; if (Rx_data[0] != '\n') { Rx_buffer[Rx_indx++] = Rx_data[0]; /*Gelen Dataları Rx_buffer'ın içine at*/ } HAL_UART_Receive_IT(&huart1, (uint8_t*) Rx_data, 1); }
Server side php code
try {
$db = new PDO("mysql:host="server";dbname="dbname";charset=utf8", "db_user", "db_pass");
} catch ( PDOException $e ){
print $e->getMessage();
}
if (isset($_GET['value'])) { $value = $_GET['value']; }
if((isset($value)))
{
$query = $db->prepare("INSERT INTO esp SET value = ?");
$insert = $query->execute(array("$value"));
if ( $insert ){
$last_id = $db->lastInsertId();
$array = array(
"Status"=>"succesfull",
"Info" => "1",
);
$json = json_encode($array);
echo $json;
}
}
else {
$array = array(
"Status"=>"Data Not Entered!",
"Info" => "0"
);
$json = json_encode($array);
echo $json;
die();
}
That's it, you can download the project file here.
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