[ARM] RN4020 Unstable Connection [Revision]

[Andriyani]

I'm so sorry everyone in this forum, I've just ignored the rules. And I want to repost my question.
It's about my different project questions. I made a project about BLE serial communication with STM32F070. The BLE I use is the RN4020 type from Microchip. I hope that later this serial communication can send data to each other from a PC to a smartphone and from a smartphone to a PC. I use Tera term serial monitor to display data sent on PC and use the MLDP terminal built in from Microchip that I installed on my smartphone to send data from smartphone to PC. To be able to transmit data, the BLE RN4020 module must be in the MLDP (Microchip Low Data Profile) mode that I have set in the program. When the program is running, BLE will issue the passcode displayed on the serial monitor and we ave to enter the passcode if our smartphone wants to connect to Bluetooth. So that, if it is connected between Bluetooth and smartphone, they can send data to each other. But the problem is that the Bluetooth connection doesn't last long, maybe only a few seconds. After that, appears in the serial monitor "Connection End" so that between the two devices can not send data each other. What should I do? I don't know what is the cause of the problem. Do you have several solutions to this project problem? And as an illustration, I also sent my code to the project that I was working on. Thank you in advance!

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#include "stm32f0xx_hal.h"
#include "usb_device.h"
 
/* USER CODE BEGIN Includes */
#include "usbd_cdc_if.h"
#include "stdbool.h"
#include "string.h"
/* USER CODE END Includes */
 
/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc;
 
I2C_HandleTypeDef hi2c1;
I2C_HandleTypeDef hi2c2;
 
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
UART_HandleTypeDef huart3;
UART_HandleTypeDef huart4;
 
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
//char txData[2] = "Hello World!\r\n";
char rxData[3];
char reply[30];
char buffer[15];
char message[30] = "Input Command!\r\n";
char command[15];
char newLineCh = '\n';
int val;
int len;
int i=0;
char buff[500];
bool setup = true;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC_Init(void);
static void MX_I2C1_Init(void);
static void MX_I2C2_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_USART3_UART_Init(void);
static void MX_USART4_UART_Init(void);
 
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
static void Bluetooth_Init(void);
/* USER CODE END PFP */
 
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  *
  * @retval None
  */
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_ADC_Init();
  MX_I2C1_Init();
  MX_I2C2_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();
  MX_USART3_UART_Init();
  MX_USART4_UART_Init();
  MX_USB_DEVICE_Init();
  /* USER CODE BEGIN 2 */
  uint8_t Text[50] = "Hello World ECG PTE\r\n";
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
 
  /* USER CODE END WHILE */
 
  /* USER CODE BEGIN 3 */
 
        CDC_Transmit_FS(Text,strlen(Text));
        HAL_Delay(10);
 
    if (setup == true)
    {
          HAL_Delay(10000);
          Bluetooth_Init();
          setup = false;
    }
      len = sprintf(buffer,"HasilPembacaan\r\n");
      HAL_UART_Transmit(&huart2, (uint8_t*)&buffer, len, 1000);
      HAL_Delay(2000);
 
 
      len = sprintf(buffer,"D\n");
      HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
      HAL_Delay(2000);
      HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
      HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
  }
 
  /* USER CODE END 3 */
 
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
 
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSI14
                              |RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.HSI14CalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL4;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB|RCC_PERIPHCLK_USART1
                              |RCC_PERIPHCLK_I2C1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
  PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_HSI;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL;
 
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
 
/* ADC init function */
static void MX_ADC_Init(void)
{
 
  ADC_ChannelConfTypeDef sConfig;
 
    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
    */
  hadc.Instance = ADC1;
  hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION_12B;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  hadc.Init.ContinuousConvMode = DISABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  if (HAL_ADC_Init(&hadc) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure for the selected ADC regular channel to be converted. 
    */
  sConfig.Channel = ADC_CHANNEL_4;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure for the selected ADC regular channel to be converted. 
    */
  sConfig.Channel = ADC_CHANNEL_5;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* I2C1 init function */
static void MX_I2C1_Init(void)
{
 
  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x2000090E;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure Analogue filter 
    */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure Digital filter 
    */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* I2C2 init function */
static void MX_I2C2_Init(void)
{
 
  hi2c2.Instance = I2C2;
  hi2c2.Init.Timing = 0x20303E5D;
  hi2c2.Init.OwnAddress1 = 0;
  hi2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c2.Init.OwnAddress2 = 0;
  hi2c2.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c2.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c2.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure Analogue filter 
    */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c2, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure Digital filter 
    */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c2, 0) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* USART1 init function */
static void MX_USART1_UART_Init(void)
{
 
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 38400;
  huart1.Init.WordLength = UART_WORDLENGTH_7B;
  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;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* USART2 init function */
static void MX_USART2_UART_Init(void)
{
 
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  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;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_RXOVERRUNDISABLE_INIT|UART_ADVFEATURE_DMADISABLEONERROR_INIT;
  huart2.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
  huart2.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* USART3 init function */
static void MX_USART3_UART_Init(void)
{
 
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/* USART4 init function */
static void MX_USART4_UART_Init(void)
{
 
  huart4.Instance = USART4;
  huart4.Init.BaudRate = 115200;
  huart4.Init.WordLength = UART_WORDLENGTH_8B;
  huart4.Init.StopBits = UART_STOPBITS_1;
  huart4.Init.Parity = UART_PARITY_NONE;
  huart4.Init.Mode = UART_MODE_TX_RX;
  huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart4.Init.OverSampling = UART_OVERSAMPLING_16;
  huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_RXOVERRUNDISABLE_INIT|UART_ADVFEATURE_DMADISABLEONERROR_INIT;
  huart4.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
  huart4.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
  if (HAL_UART_Init(&huart4) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}
 
/** Configure pins as 
        * Analog 
        * Input 
        * Output
        * EVENT_OUT
        * EXTI
*/
static void MX_GPIO_Init(void)
{
 
  GPIO_InitTypeDef GPIO_InitStruct;
 
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, BAT_STATUS1_Pin|BAT_STATUS2_Pin|COM_MCU_SYNC_Pin|TEST_LED2_Pin, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, BAT_STATUS3_Pin|BAT_STATUS4_Pin|CHG_CURRENT_SET_Pin|POWER_ON_HOLD_Pin 
                          |BT_RTS_Pin, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, BLUETOOTH_STAT_Pin|USB_PUP_Pin|BT_CMD_MLDP_Pin|BT_WAKE_SW_Pin, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(BT_WAKE_HW_GPIO_Port, BT_WAKE_HW_Pin, GPIO_PIN_RESET);
 
  /*Configure GPIO pins : BAT_STATUS1_Pin BAT_STATUS2_Pin COM_MCU_SYNC_Pin TEST_LED2_Pin */
  GPIO_InitStruct.Pin = BAT_STATUS1_Pin|BAT_STATUS2_Pin|COM_MCU_SYNC_Pin|TEST_LED2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
  /*Configure GPIO pins : BAT_STATUS3_Pin BAT_STATUS4_Pin CHG_CURRENT_SET_Pin POWER_ON_HOLD_Pin 
                           BT_RTS_Pin */
  GPIO_InitStruct.Pin = BAT_STATUS3_Pin|BAT_STATUS4_Pin|CHG_CURRENT_SET_Pin|POWER_ON_HOLD_Pin 
                          |BT_RTS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
  /*Configure GPIO pins : BLUETOOTH_STAT_Pin USB_PUP_Pin BT_CMD_MLDP_Pin BT_WAKE_SW_Pin */
  GPIO_InitStruct.Pin = BLUETOOTH_STAT_Pin|USB_PUP_Pin|BT_CMD_MLDP_Pin|BT_WAKE_SW_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
  /*Configure GPIO pins : POWER_PUSH_BUTTON_Pin BT_CTS_Pin */
  GPIO_InitStruct.Pin = POWER_PUSH_BUTTON_Pin|BT_CTS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
  /*Configure GPIO pin : CHG_IND_MCU_Pin */
  GPIO_InitStruct.Pin = CHG_IND_MCU_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(CHG_IND_MCU_GPIO_Port, &GPIO_InitStruct);
 
  /*Configure GPIO pin : BT_WAKE_HW_Pin */
  GPIO_InitStruct.Pin = BT_WAKE_HW_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(BT_WAKE_HW_GPIO_Port, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
static void Bluetooth_Init(void)
{
    HAL_GPIO_WritePin(GPIOB, BT_WAKE_SW_Pin, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOB, BT_CMD_MLDP_Pin, GPIO_PIN_SET);
    HAL_GPIO_TogglePin(GPIOA,TEST_LED2_Pin);
 
    len = sprintf(buffer,"+\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"D\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"SF,1\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"SS,F0000000\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"SN,ECG_PTE_2\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"SR,0x00000800\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"R,1\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
    HAL_Delay(1000);
 
    len = sprintf(buffer,"F\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    HAL_Delay(5000);
 
    len = sprintf(buffer,"X\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    len = sprintf(buffer,"A\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, 500, 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
 
    HAL_GPIO_WritePin(GPIOB, BT_CMD_MLDP_Pin, GPIO_PIN_SET);
 
    len = sprintf(buffer,"+\n");
    HAL_UART_Transmit(&huart4, (uint8_t*)&buffer, len, 1000);
    HAL_UART_Receive(&huart4, (uint8_t *)buff, strlen(buff), 5000 );
    HAL_UART_Transmit(&huart2, (uint8_t*)&buff, strlen(buff), 1000);
}
/* USER CODE END 4 */

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