HELP UART HM10 dynamic size data receive

[ISHA]

HELLO, 

i am new to STM, i am stuck in receiving dynamic size data from HM10 to stm32f407VG over UART2 communication , i tried  HAL_UART_Receive_IT(&huart2, &UART2_rxBuffer[rxIndex], 1); but not able to receive multiple char as 3rd part of this HAL_UART_Receive_IT(&huart2, &UART2_rxBuffer[rxIndex], 1); is 1 if i make it 12 then if i recive 12 char then data is visible and i want to receive any size of data string . 

please help

THANKS

/* USER CODE BEGIN Header */

/**

  ******************************************************************************

  * @file           : main.c

  * @brief          : Main program body

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2024 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

#include <string.h>

#include"liquidcrystal_i2c.h"

//#include "stdio.h"

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/

/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/

/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

I2C_HandleTypeDef hi2c1;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

uint8_t UART2_rxBuffer[2] = {0};//should be 4 if sending isha

#define RX_BUFFER_SIZE 100

uint8_t data1Received = 0;

uint8_t data2Received = 0;

//#define RX_BUFFER_SIZE 50

//char rxBuffer[RX_BUFFER_SIZE];

//uint8_t rxIndex = 0;

//volatile uint8_t rxComplete = 0;

//#define LED12_PIN GPIO_PIN_12

//#define LED15_PIN GPIO_PIN_15

//char Rx_data[25] = "";

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_USART2_UART_Init(void);

static void MX_I2C1_Init(void);

/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

//uint8_t Data[64];

//void Delay_ms(volatile int time_ms);

//void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)

//{

// if (huart->Instance == USART2)

// {

// HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET);

// //HAL_UART_Transmit(&huart2, Data, Size, 1000);

// //HAL_UART_Transmit(&huart2, Data, Size, 1000);

// }

//// else if (huart2->Instance == USART2)

//// {

////

//// //HAL_UART_Transmit(&huart1, Data, Size, 1000);

//// }

// //HAL_UART_Receive_IT(huart2, Data, 64);

// HAL_UART_Receive_IT(huart, Data, 64);

//}

//void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)

//{

//    // Handle UART errors here

//    // Print error message on LCD

//    HD44780_Clear();

//    HD44780_SetCursor(0, 0);

//    HD44780_PrintStr("UART error");

//}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)

{

HAL_UART_Transmit(&huart2, UART2_rxBuffer, 2, 50);//

   // HAL_UART_Receive_IT(&huart2, UART2_rxBuffer, 2);//should be 4 if sending data

HD44780_Clear();

    HD44780_SetCursor(0,0);

    HD44780_PrintStr("gio");

    if (strncmp((char *)UART2_rxBuffer, "ON", 2) == 0)

            {

                // Turn on LED connected to pin 15

                HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_SET);

    //data1Received = 1; // Set flag for "isha" received

    //data2Received = 0; // Clear flag for "jeet" received

            }

            // Check if "jeet" is received

            else if (strncmp((char *)UART2_rxBuffer, "OF", 2) == 0)

            {

                // Turn on LED connected to pin 14

            HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET);

                //HAL_GPIO_WritePin(GPIOD, GPIO_PIN_14, GPIO_PIN_SET); // ID if task is simple

            //data2Received = 1; // Set flag for "jeet" received// ID IF task is time taking

            //data1Received = 0; // Clear flag for "isha" received // ID IF task is time taking

            }

    if (huart->Instance == USART2)

    {

    HD44780_Clear();

    HD44780_SetCursor(0,0);

    HD44780_PrintStr("instance");

        //HD44780_Clear();

        HD44780_SetCursor(0, 1);

        HD44780_PrintStr("Received: ");

        HD44780_PrintStr((char *)UART2_rxBuffer);

    }

    HAL_UART_Receive_IT(&huart2, UART2_rxBuffer, 2);//should be 4 if sending data

}

//void toggleLEDs(void)

//{

//    // Toggle LED 15 if "isha" received

//    if (data1Received)

//    {

//        HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_15);

//    }

//

//    // Toggle LED 14 if "jeet" received

//    if (data2Received)

//    {

//        HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_14);

//    }

//}

/* USER CODE END 0 */

/**

  * @brief  The application entry point.

  * @retval int

  */

int main(void)

{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */

  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */

  MX_GPIO_Init();

  MX_USART2_UART_Init();

  MX_I2C1_Init();

  /* USER CODE BEGIN 2 */

  HAL_UART_Receive_IT (&huart2, UART2_rxBuffer, 2);

  HD44780_Init(2);

        HD44780_Clear();

        HD44780_SetCursor(0,0);

        HD44780_PrintStr("HELLO");

        HAL_Delay(200);

  /* USER CODE END 2 */

  /* Infinite loop */

  /* USER CODE BEGIN WHILE */

  while (1)

  {

//   toggleLEDs(); // Toggle LEDs based on received strings

//

//             // Delay for 500 milliseconds (0.5 second)

//             HAL_Delay(500);

//

//             // Repeat for a total of 6 times to create a 3-second toggle

//             for (int i = 0; i < 6; i++)

//             {

//                 toggleLEDs(); // Toggle LEDs based on received strings

//

//                 // Delay for 500 milliseconds (0.5 second)

//                 HAL_Delay(100);

//             }

//

//             // Clear the flags after 3 seconds

//           data1Received = 0;

//         data2Received = 0;

//      if (rxComplete) {

//          rxComplete = 0; // Reset flag

//

//          // Process received data

//          if (strcmp(rxBuffer, "hello") == 0) {

//              HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET); // Turn on LED12

//              HAL_Delay(1000); // Delay for 1 second

//              HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_RESET); // Turn off LED12

//          }

//          else if (strcmp(rxBuffer, "hii") == 0) {

//              HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_SET); // Turn on LED15

//              HAL_Delay(1000); // Delay for 1 second

//              HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET); // Turn off LED15

//          }

//

//          // Clear the buffer

//          memset(rxBuffer, 0, sizeof(rxBuffer));

//          rxIndex = 0;

//

//          // Start another reception

//          HAL_UART_Receive_IT(&huart2, (uint8_t*)&rxBuffer[rxIndex], 1);

//      }

//   HAL_UART_Receive(&huart2,(uint8_t*)rxBuffer,RX_BUFFER_SIZE,100);

//   printf(" %s\n", rxBuffer);

//      if (strcmp(rxBuffer, "hello") == 0) {

//          HAL_GPIO_WritePin(GPIOD, LED12_PIN, GPIO_PIN_SET); // Turn on LED12

//          HAL_Delay(1000); // Delay for 1 second

//          HAL_GPIO_WritePin(GPIOD, LED12_PIN, GPIO_PIN_RESET); // Turn off LED12

//      }

//      else if (strcmp(rxBuffer, "hii") == 0) {

//          HAL_GPIO_WritePin(GPIOD, LED15_PIN, GPIO_PIN_SET); // Turn on LED15

//          HAL_Delay(1000); // Delay for 1 second

//          HAL_GPIO_WritePin(GPIOD, LED15_PIN, GPIO_PIN_RESET); // Turn off LED15

//      }

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

  }

  /* USER CODE END 3 */

}

/**

  * @brief System Clock Configuration

  * @retval None

  */

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage 

  */

  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB busses clocks 

  */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;

  RCC_OscInitStruct.HSIState = RCC_HSI_ON;

  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;

  RCC_OscInitStruct.PLL.PLLM = 8;

  RCC_OscInitStruct.PLL.PLLN = 168;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

  RCC_OscInitStruct.PLL.PLLQ = 4;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    Error_Handler();

  }

  /** Initializes the CPU, AHB and APB busses clocks 

  */

  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_DIV4;

  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)

  {

    Error_Handler();

  }

}

/**

  * @brief I2C1 Initialization Function

  * @PAram None

  * @retval None

  */

static void MX_I2C1_Init(void)

{

  /* USER CODE BEGIN I2C1_Init 0 */

  /* USER CODE END I2C1_Init 0 */

  /* USER CODE BEGIN I2C1_Init 1 */

  /* USER CODE END I2C1_Init 1 */

  hi2c1.Instance = I2C1;

  hi2c1.Init.ClockSpeed = 100000;

  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;

  hi2c1.Init.OwnAddress1 = 0;

  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;

  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;

  hi2c1.Init.OwnAddress2 = 0;

  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;

  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

  if (HAL_I2C_Init(&hi2c1) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */

}

/**

  * @brief USART2 Initialization Function

  * @PAram None

  * @retval None

  */

static void MX_USART2_UART_Init(void)

{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */

  huart2.Instance = USART2;

  huart2.Init.BaudRate = 9600;

  huart2.Init.WordLength = UART_WORDLENGTH_8B;

  huart2.Init.StopBits = UART_STOPBITS_1;

  huart2.Init.Parity = UART_PARITY_NONE;

  huart2.Init.Mode = UART_MODE_TX_RX;

  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;

  huart2.Init.OverSampling = UART_OVERSAMPLING_16;

  if (HAL_UART_Init(&huart2) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

/**

  * @brief GPIO Initialization Function

  * @PAram None

  * @retval None

  */

static void MX_GPIO_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */

  __HAL_RCC_GPIOH_CLK_ENABLE();

  __HAL_RCC_GPIOA_CLK_ENABLE();

  __HAL_RCC_GPIOD_CLK_ENABLE();

  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */

  HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);

  /*Configure GPIO pins : PD12 PD13 PD14 PD15 */

  GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;

  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);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**

  * @brief  This function is executed in case of error occurrence.

  * @retval None

  */

void Error_Handler(void)

{

  /* USER CODE BEGIN Error_Handler_Debug */

  /* User can add his own implementation to report the HAL error return state */

  /* USER CODE END Error_Handler_Debug */

}

#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 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

[Karl Yamashita]

Use code insert so your code is formatted for easy reading.

 

If you're receiving strings, hopefully with a LF, you can use a ring buffer/queue to save what you received. Then you can parse the message outside of the interrupt. Right now you're doing way to much processing inside the interrupt so you have a high chance of missing the next few bytes.

See this project https://github.com/karlyamashita/ParseRawData/wiki

Or you can use the Idle interrupt using the DMA

https://github.com/karlyamashita/Nucleo-G431RB_Three_UART/wiki

[Tesla DeLorean]

How are you going to determine the length/end of the input? Construct a line buffer holding that until the end, then process.

Avoid doing all this time wasting stuff in the interrupt or callback. If it take more than a byte-time you run the risk of losing data or overrunning.

The STM32F4 is going to interrupt for each byte