Stm32h743ii 2 i2c independant bus

[KNaim.1]

Dear all;

I have a *** question but it dont work can we have quantity 2 different i2c bus 
1 is reconized but not the second bus

 /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_LTDC_Init();
  MX_QUADSPI_Init();
  MX_FMC_Init();
  MX_I2C2_Init();
  MX_I2C4_Init();
  MX_SPI1_Init();
  MX_UART4_Init();
  MX_USART1_UART_Init();
  MX_TIM3_Init();
  MX_DMA2D_Init();
  /* USER CODE BEGIN 2 */

  int P=10000;

   HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_4);
   //htim3.Instance->CCR1=50;
   __HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_4, P);



  HAL_StatusTypeDef result;
   	uint8_t i;
   	for (i=1; i<128; i++)
   	{

   	  /* * the HAL wants a left aligned i2c address
   	   * &hi2c1 is the handle
   	   * (uint16_t)(i<<1) is the i2c address left aligned
   	   * retries 2
   	   * timeout 2*/

   		//ret = HAL_I2C_IsDeviceReady(&hi2c2, (uint16_t)(i<<1), 3, 5);

   	  result = HAL_I2C_IsDeviceReady(&hi2c2, (uint16_t)(i<<1), 3, 5);
   	  if (result != HAL_OK) // HAL_ERROR or HAL_BUSY or HAL_TIMEOUT
   	  {
   		  printf("."); // No ACK received at that address
   	  }
   	  if (result == HAL_OK)
   	  {
   		  printf("0x%X", i); // Received an ACK at that address
   	  }
   	}
   	printf("\r\n");

   	HAL_StatusTypeDef result2;
   	   	uint8_t z;
   	   	for (z=1; z<128; z++)
   	   	{

   	   	   /** the HAL wants a left aligned i2c address
   	   	   * &hi2c1 is the handle
   	   	   * (uint16_t)(i<<1) is the i2c address left aligned
   	   	   * retries 2
   	   	   * timeout 2
*/
   	   		//ret = HAL_I2C_IsDeviceReady(&hi2c2, (uint16_t)(i<<1), 3, 5);

   	   	  result2 = HAL_I2C_IsDeviceReady(&hi2c4, (uint16_t)(z<<1), 3, 5);
   	   	  if (result2 != HAL_OK) // HAL_ERROR or HAL_BUSY or HAL_TIMEOUT
   	   	  {
   	   		  printf("."); // No ACK received at that address
   	   	  }
   	   	  if (result2 == HAL_OK)
   	   	  {
   	   		  printf("0x%X", z); // Received an ACK at that address
   	   	  }
   	   	}
   	   	printf("\r\n");

[TDK]

Common issues with I2C:

• Missing pullup resistors. Pullup should generally be in the 1-4.7 kOhm range.
• Incorrect wiring.
• Incorrect drive voltage--ensure VDD is compatible between the two.
• Slave is holding SDA low due to previously interrupt communication. Power cycling can fix.

If you have a logic analyzer, look at SDA/SCL signals.

[Tesla DeLorean]

What might help is the initialization code, and a schematic/wiring diagram or exactly what you've built.

What device is connected to I2C4 ? What address is it supposed to respond at ?

Is the issue with the Slave or the Master? You're just showing code probing the address space.

[KNaim.1]

Thanks for reply That 's really strange i dont understand it's not the first time that occur 
It's a compile error :

#include "i2c.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

I2C_HandleTypeDef hi2c2;
I2C_HandleTypeDef hi2c4;

/* I2C2 init function */
void MX_I2C2_Init(void)
{

  /* USER CODE BEGIN I2C2_Init 0 */

  /* USER CODE END I2C2_Init 0 */

  /* USER CODE BEGIN I2C2_Init 1 */

  /* USER CODE END I2C2_Init 1 */
  hi2c2.Instance = I2C2;
  hi2c2.Init.Timing = 0x009034B6;
  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();
  }

  /** Configure Analogue filter
  */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c2, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Digital filter
  */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c2, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C2_Init 2 */

  /* USER CODE END I2C2_Init 2 */

}
/* I2C4 init function */
void MX_I2C4_Init(void)
{

  /* USER CODE BEGIN I2C4_Init 0 */

  /* USER CODE END I2C4_Init 0 */

  /* USER CODE BEGIN I2C4_Init 1 */

  /* USER CODE END I2C4_Init 1 */
  hi2c4.Instance = I2C4;
  hi2c4.Init.Timing = 0x009034B6;
  hi2c4.Init.OwnAddress1 = 0;
  hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c4.Init.OwnAddress2 = 0;
  hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c4) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Analogue filter
  */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Digital filter
  */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C4_Init 2 */

  /* USER CODE END I2C4_Init 2 */

}

void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(i2cHandle->Instance==I2C2)
  {
  /* USER CODE BEGIN I2C2_MspInit 0 */

  /* USER CODE END I2C2_MspInit 0 */

  /** Initializes the peripherals clock
  */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2C2;
    PeriphClkInitStruct.I2c123ClockSelection = RCC_I2C123CLKSOURCE_D2PCLK1;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }

    __HAL_RCC_GPIOH_CLK_ENABLE();
    /**I2C2 GPIO Configuration
    PH4     ------> I2C2_SCL
    PH5     ------> I2C2_SDA
    */
    GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF4_I2C2;
    HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);

    /* I2C2 clock enable */
    __HAL_RCC_I2C2_CLK_ENABLE();
  /* USER CODE BEGIN I2C2_MspInit 1 */

  /* USER CODE END I2C2_MspInit 1 */
  }
  else if(i2cHandle->Instance==I2C4)
  {
  /* USER CODE BEGIN I2C4_MspInit 0 */

  /* USER CODE END I2C4_MspInit 0 */

  /** Initializes the peripherals clock
  */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2C4;
    PeriphClkInitStruct.I2c4ClockSelection = RCC_I2C4CLKSOURCE_D3PCLK1;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }

    __HAL_RCC_GPIOD_CLK_ENABLE();
    /**I2C4 GPIO Configuration
    PD12     ------> I2C4_SCL
    PD13     ------> I2C4_SDA
    */
    GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF4_I2C4;
    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

    /* I2C4 clock enable */
    __HAL_RCC_I2C4_CLK_ENABLE();
  /* USER CODE BEGIN I2C4_MspInit 1 */

  /* USER CODE END I2C4_MspInit 1 */
  }
}

void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
{

  if(i2cHandle->Instance==I2C2)
  {
  /* USER CODE BEGIN I2C2_MspDeInit 0 */

  /* USER CODE END I2C2_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_I2C2_CLK_DISABLE();

    /**I2C2 GPIO Configuration
    PH4     ------> I2C2_SCL
    PH5     ------> I2C2_SDA
    */
    HAL_GPIO_DeInit(GPIOH, GPIO_PIN_4);

    HAL_GPIO_DeInit(GPIOH, GPIO_PIN_5);

  /* USER CODE BEGIN I2C2_MspDeInit 1 */

  /* USER CODE END I2C2_MspDeInit 1 */
  }
  else if(i2cHandle->Instance==I2C4)
  {
  /* USER CODE BEGIN I2C4_MspDeInit 0 */

  /* USER CODE END I2C4_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_I2C4_CLK_DISABLE();

    /**I2C4 GPIO Configuration
    PD12     ------> I2C4_SCL
    PD13     ------> I2C4_SDA
    */
    HAL_GPIO_DeInit(GPIOD, GPIO_PIN_12);

    HAL_GPIO_DeInit(GPIOD, GPIO_PIN_13);

  /* USER CODE BEGIN I2C4_MspDeInit 1 */

  /* USER CODE END I2C4_MspDeInit 1 */
  }
}

[KNaim.1]

here is the error:

09:10:33 **** Incremental Build of configuration Debug for project STM32h743_i2cscan ****
make -j24 all 
arm-none-eabi-gcc "../Core/Src/main.c" -mcpu=cortex-m7 -std=gnu11 -g3 -DDEBUG -DUSE_PWR_LDO_SUPPLY -DUSE_HAL_DRIVER -DSTM32H743xx -c -I../Core/Inc -I../Drivers/STM32H7xx_HAL_Driver/Inc -I../Drivers/STM32H7xx_HAL_Driver/Inc/Legacy -I../Drivers/CMSIS/Device/ST/STM32H7xx/Include -I../Drivers/CMSIS/Include -O0 -ffunction-sections -fdata-sections -Wall -fstack-usage -fcyclomatic-complexity -MMD -MP -MF"Core/Src/main.d" -MT"Core/Src/main.o" --specs=nano.specs -mfpu=fpv5-d16 -mfloat-abi=hard -mthumb -o "Core/Src/main.o"
../Core/Src/main.c: In function 'main':
../Core/Src/main.c:134:3: warning: implicit declaration of function 'MX_I2C4_Init'; did you mean 'MX_I2C2_Init'? [-Wimplicit-function-declaration]
  134 |   MX_I2C4_Init();
      |   ^~~~~~~~~~~~
      |   MX_I2C2_Init
../Core/Src/main.c:188:52: error: 'hi2c4' undeclared (first use in this function); did you mean 'hi2c2'?
  188 |                   result2 = HAL_I2C_IsDeviceReady(&hi2c4, (uint16_t)(z<<1), 3, 5);
      |                                                    ^~~~~
      |                                                    hi2c2
../Core/Src/main.c:188:52: note: each undeclared identifier is reported only once for each function it appears in
../Core/Src/main.c:199:23: warning: implicit declaration of function 'SDRAM_InitSequence' [-Wimplicit-function-declaration]
  199 |                       SDRAM_InitSequence();
      |                       ^~~~~~~~~~~~~~~~~~
make: *** [Core/Src/subdir.mk:67: Core/Src/main.o] Error 1
"make -j24 all" terminated with exit code 2. Build might be incomplete.

09:10:34 Build Failed. 2 errors, 2 warnings. (took 611ms)

I don't understand why Hal inicialise the first i2c and not i2c4

[Pavel A.]

It looks like the source files that are compiled are out of sync with what you see in the IDE.

Make sure all files are saved, then refresh (F5).

[Tesla DeLorean]

It's like you've split the code into different files, and main.c has no reference too the instances or functions.