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AVINASH PATHAK
Associate III
July 28, 2018
Question

I2C clock not generated on SCK pin

  • July 28, 2018
  • 5 replies
  • 2476 views

I was working on i2c using STM32L476 nucleo board.I used stm32cube to make a code for keil.When I generated the code and programmed it in the board i found that the oscilloscope was not showing any clock on it .Oscilloscope's channel1 was connected to to GND AND PB6 pin of board.After that I put a function call HAL_I2C_Init(&hi2c1) in main() before the while() loop.

oscilloscope only showed constant high of 3.3Volt.Please help to solve the problem.

    This topic has been closed for replies.

    5 replies

    GenuineDeveloper
    Associate III
    July 28, 2018

    Insufficient information. Can your provide the I2c communication code structure you have written. I have not worked with HAL. Still that piece of information could be vital.

    AVINASH PATHAK
    Associate III
    July 28, 2018

    I am all the source files of the projects

    AVINASH PATHAK
    Associate III
    July 28, 2018

    Sorry ,I am attaching all source files

    /**
     ******************************************************************************
     * @file : main.c
     * @brief : Main program body
     ******************************************************************************
     ** This notice applies to any and all portions of this file
     * that are not between comment pairs USER CODE BEGIN and
     * USER CODE END. Other portions of this file, whether 
     * inserted by the user or by software development tools
     * are owned by their respective copyright owners.
     *
     * COPYRIGHT(c) 2018 STMicroelectronics
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     * 1. Redistributions of source code must retain the above copyright notice,
     * this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright notice,
     * this list of conditions and the following disclaimer in the documentation
     * and/or other materials provided with the distribution.
     * 3. Neither the name of STMicroelectronics nor the names of its contributors
     * may be used to endorse or promote products derived from this software
     * without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     ******************************************************************************
     */
    /* Includes ------------------------------------------------------------------*/
    #include "main.h"
    #include "stm32l4xx_hal.h"
     
    /* USER CODE BEGIN Includes */
     
    /* USER CODE END Includes */
     
    /* Private variables ---------------------------------------------------------*/
    I2C_HandleTypeDef hi2c1;
     
    /* USER CODE BEGIN PV */
    /* Private variables ---------------------------------------------------------*/
     
    /* USER CODE END PV */
     
    /* Private function prototypes -----------------------------------------------*/
    void SystemClock_Config(void);
    static void MX_GPIO_Init(void);
    static void MX_I2C1_Init(void);
     
    /* USER CODE BEGIN PFP */
    /* Private function prototypes -----------------------------------------------*/
     
    /* USER CODE END PFP */
     
    /* USER CODE BEGIN 0 */
    uint8_t buff[2]={'a','b'};
    /* 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_I2C1_Init();
     /* USER CODE BEGIN 2 */
    HAL_I2C_Init(&hi2c1);
     /* USER CODE END 2 */
    HAL_I2C_Master_Transmit_IT(&hi2c1,0,buff,2);
     /* Infinite loop */
     /* USER CODE BEGIN WHILE */
     while (1)
     {
     
     /* 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;
     RCC_ClkInitTypeDef RCC_ClkInitStruct;
     RCC_PeriphCLKInitTypeDef PeriphClkInit;
     
     /**Initializes the CPU, AHB and APB busses clocks 
     */
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
     RCC_OscInitStruct.HSIState = RCC_HSI_ON;
     RCC_OscInitStruct.HSICalibrationValue = 16;
     RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
     RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
     RCC_OscInitStruct.PLL.PLLN = 10;
     RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
     RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
     RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
     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_CLOCKTYPE_PCLK2;
     RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
     RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
     RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
     if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
     {
     _Error_Handler(__FILE__, __LINE__);
     }
     
     PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_I2C1;
     PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
     if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
     {
     _Error_Handler(__FILE__, __LINE__);
     }
     
     /**Configure the main internal regulator output voltage 
     */
     if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != 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);
    }
     
    /* I2C1 init function */
    static void MX_I2C1_Init(void)
    {
     
     hi2c1.Instance = I2C1;
     hi2c1.Init.Timing = 0x10909CEC;
     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__);
     }
     
    }
     
    /** Pinout Configuration
    */
    static void MX_GPIO_Init(void)
    {
     
     /* GPIO Ports Clock Enable */
     __HAL_RCC_GPIOB_CLK_ENABLE();
     
    }
     
    /* USER CODE BEGIN 4 */
     
    /* USER CODE END 4 */
     
    /**
     * @brief This function is executed in case of error occurrence.
     * @param file: The file name as string.
     * @param line: The line in file as a number.
     * @retval None
     */
    void _Error_Handler(char *file, int line)
    {
     /* USER CODE BEGIN Error_Handler_Debug */
     /* User can add his own implementation to report the HAL error return state */
     while(1)
     {
     }
     /* 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****/

    AVINASH PATHAK
    Associate III
    July 28, 2018
    /**
     ******************************************************************************
     * @file stm32l4xx_it.c
     * @brief Interrupt Service Routines.
     ******************************************************************************
     *
     * COPYRIGHT(c) 2018 STMicroelectronics
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     * 1. Redistributions of source code must retain the above copyright notice,
     * this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright notice,
     * this list of conditions and the following disclaimer in the documentation
     * and/or other materials provided with the distribution.
     * 3. Neither the name of STMicroelectronics nor the names of its contributors
     * may be used to endorse or promote products derived from this software
     * without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     ******************************************************************************
     */
    /* Includes ------------------------------------------------------------------*/
    #include "stm32l4xx_hal.h"
    #include "stm32l4xx.h"
    #include "stm32l4xx_it.h"
     
    /* USER CODE BEGIN 0 */
    extern uint8_t buff[2];
    /* USER CODE END 0 */
     
    /* External variables --------------------------------------------------------*/
    extern I2C_HandleTypeDef hi2c1;
     
    /******************************************************************************/
    /* Cortex-M4 Processor Interruption and Exception Handlers */ 
    /******************************************************************************/
     
    /**
    * @brief This function handles Non maskable interrupt.
    */
    void NMI_Handler(void)
    {
     /* USER CODE BEGIN NonMaskableInt_IRQn 0 */
     
     /* USER CODE END NonMaskableInt_IRQn 0 */
     /* USER CODE BEGIN NonMaskableInt_IRQn 1 */
     
     /* USER CODE END NonMaskableInt_IRQn 1 */
    }
     
    /**
    * @brief This function handles Hard fault interrupt.
    */
    void HardFault_Handler(void)
    {
     /* USER CODE BEGIN HardFault_IRQn 0 */
     
     /* USER CODE END HardFault_IRQn 0 */
     while (1)
     {
     /* USER CODE BEGIN W1_HardFault_IRQn 0 */
     /* USER CODE END W1_HardFault_IRQn 0 */
     }
     /* USER CODE BEGIN HardFault_IRQn 1 */
     
     /* USER CODE END HardFault_IRQn 1 */
    }
     
    /**
    * @brief This function handles Memory management fault.
    */
    void MemManage_Handler(void)
    {
     /* USER CODE BEGIN MemoryManagement_IRQn 0 */
     
     /* USER CODE END MemoryManagement_IRQn 0 */
     while (1)
     {
     /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
     /* USER CODE END W1_MemoryManagement_IRQn 0 */
     }
     /* USER CODE BEGIN MemoryManagement_IRQn 1 */
     
     /* USER CODE END MemoryManagement_IRQn 1 */
    }
     
    /**
    * @brief This function handles Prefetch fault, memory access fault.
    */
    void BusFault_Handler(void)
    {
     /* USER CODE BEGIN BusFault_IRQn 0 */
     
     /* USER CODE END BusFault_IRQn 0 */
     while (1)
     {
     /* USER CODE BEGIN W1_BusFault_IRQn 0 */
     /* USER CODE END W1_BusFault_IRQn 0 */
     }
     /* USER CODE BEGIN BusFault_IRQn 1 */
     
     /* USER CODE END BusFault_IRQn 1 */
    }
     
    /**
    * @brief This function handles Undefined instruction or illegal state.
    */
    void UsageFault_Handler(void)
    {
     /* USER CODE BEGIN UsageFault_IRQn 0 */
     
     /* USER CODE END UsageFault_IRQn 0 */
     while (1)
     {
     /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
     /* USER CODE END W1_UsageFault_IRQn 0 */
     }
     /* USER CODE BEGIN UsageFault_IRQn 1 */
     
     /* USER CODE END UsageFault_IRQn 1 */
    }
     
    /**
    * @brief This function handles System service call via SWI instruction.
    */
    void SVC_Handler(void)
    {
     /* USER CODE BEGIN SVCall_IRQn 0 */
     
     /* USER CODE END SVCall_IRQn 0 */
     /* USER CODE BEGIN SVCall_IRQn 1 */
     
     /* USER CODE END SVCall_IRQn 1 */
    }
     
    /**
    * @brief This function handles Debug monitor.
    */
    void DebugMon_Handler(void)
    {
     /* USER CODE BEGIN DebugMonitor_IRQn 0 */
     
     /* USER CODE END DebugMonitor_IRQn 0 */
     /* USER CODE BEGIN DebugMonitor_IRQn 1 */
     
     /* USER CODE END DebugMonitor_IRQn 1 */
    }
     
    /**
    * @brief This function handles Pendable request for system service.
    */
    void PendSV_Handler(void)
    {
     /* USER CODE BEGIN PendSV_IRQn 0 */
     
     /* USER CODE END PendSV_IRQn 0 */
     /* USER CODE BEGIN PendSV_IRQn 1 */
     
     /* USER CODE END PendSV_IRQn 1 */
    }
     
    /**
    * @brief This function handles System tick timer.
    */
    void SysTick_Handler(void)
    {
     /* USER CODE BEGIN SysTick_IRQn 0 */
     
     /* USER CODE END SysTick_IRQn 0 */
     HAL_IncTick();
     HAL_SYSTICK_IRQHandler();
     /* USER CODE BEGIN SysTick_IRQn 1 */
     
     /* USER CODE END SysTick_IRQn 1 */
    }
     
    /******************************************************************************/
    /* STM32L4xx Peripheral Interrupt Handlers */
    /* Add here the Interrupt Handlers for the used peripherals. */
    /* For the available peripheral interrupt handler names, */
    /* please refer to the startup file (startup_stm32l4xx.s). */
    /******************************************************************************/
     
    /**
    * @brief This function handles I2C1 event interrupt.
    */
    void I2C1_EV_IRQHandler(void)
    {
     /* USER CODE BEGIN I2C1_EV_IRQn 0 */
    if (hi2c1.Instance->ISR & (I2C_FLAG_BERR | I2C_FLAG_ARLO | I2C_FLAG_OVR)) {
     HAL_I2C_ER_IRQHandler(&hi2c1);
     } else {
     HAL_I2C_EV_IRQHandler(&hi2c1);
     }
     /* USER CODE END I2C1_EV_IRQn 0 */
     HAL_I2C_EV_IRQHandler(&hi2c1);
     /* USER CODE BEGIN I2C1_EV_IRQn 1 */
     
     /* USER CODE END I2C1_EV_IRQn 1 */
    }
     
    /* USER CODE BEGIN 1 */
     
    /* USER CODE END 1 */
    /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

    AVINASH PATHAK
    Associate III
    July 28, 2018
    /**
     ******************************************************************************
     * File Name : stm32l4xx_hal_msp.c
     * Description : This file provides code for the MSP Initialization 
     * and de-Initialization codes.
     ******************************************************************************
     ** This notice applies to any and all portions of this file
     * that are not between comment pairs USER CODE BEGIN and
     * USER CODE END. Other portions of this file, whether 
     * inserted by the user or by software development tools
     * are owned by their respective copyright owners.
     *
     * COPYRIGHT(c) 2018 STMicroelectronics
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     * 1. Redistributions of source code must retain the above copyright notice,
     * this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright notice,
     * this list of conditions and the following disclaimer in the documentation
     * and/or other materials provided with the distribution.
     * 3. Neither the name of STMicroelectronics nor the names of its contributors
     * may be used to endorse or promote products derived from this software
     * without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     ******************************************************************************
     */
    /* Includes ------------------------------------------------------------------*/
    #include "stm32l4xx_hal.h"
     
    extern void _Error_Handler(char *, int);
    /* USER CODE BEGIN 0 */
     
    /* USER CODE END 0 */
    /**
     * Initializes the Global MSP.
     */
    void HAL_MspInit(void)
    {
     /* USER CODE BEGIN MspInit 0 */
     
     /* USER CODE END MspInit 0 */
     
     __HAL_RCC_SYSCFG_CLK_ENABLE();
     __HAL_RCC_PWR_CLK_ENABLE();
     
     HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
     
     /* System interrupt init*/
     /* MemoryManagement_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(MemoryManagement_IRQn, 0, 0);
     /* BusFault_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(BusFault_IRQn, 0, 0);
     /* UsageFault_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(UsageFault_IRQn, 0, 0);
     /* SVCall_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(SVCall_IRQn, 0, 0);
     /* DebugMonitor_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(DebugMonitor_IRQn, 0, 0);
     /* PendSV_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(PendSV_IRQn, 0, 0);
     /* SysTick_IRQn interrupt configuration */
     HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
     
     /* USER CODE BEGIN MspInit 1 */
     
     /* USER CODE END MspInit 1 */
    }
     
    void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
    {
     
     GPIO_InitTypeDef GPIO_InitStruct;
     if(hi2c->Instance==I2C1)
     {
     /* USER CODE BEGIN I2C1_MspInit 0 */
     
     /* USER CODE END I2C1_MspInit 0 */
     
     /**I2C1 GPIO Configuration 
     PB6 ------> I2C1_SCL
     PB7 ------> I2C1_SDA 
     */
     GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
     GPIO_InitStruct.Pull = GPIO_PULLUP;
     GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
     GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
     
     /* Peripheral clock enable */
     __HAL_RCC_I2C1_CLK_ENABLE();
     /* I2C1 interrupt Init */
     HAL_NVIC_SetPriority(I2C1_EV_IRQn, 0, 0);
     HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
     /* USER CODE BEGIN I2C1_MspInit 1 */
     
     /* USER CODE END I2C1_MspInit 1 */
     }
     
    }
     
    void HAL_I2C_MspDeInit(I2C_HandleTypeDef* hi2c)
    {
     
     if(hi2c->Instance==I2C1)
     {
     /* USER CODE BEGIN I2C1_MspDeInit 0 */
     
     /* USER CODE END I2C1_MspDeInit 0 */
     /* Peripheral clock disable */
     __HAL_RCC_I2C1_CLK_DISABLE();
     
     /**I2C1 GPIO Configuration 
     PB6 ------> I2C1_SCL
     PB7 ------> I2C1_SDA 
     */
     HAL_GPIO_DeInit(GPIOB, GPIO_PIN_6|GPIO_PIN_7);
     
     /* I2C1 interrupt DeInit */
     HAL_NVIC_DisableIRQ(I2C1_EV_IRQn);
     /* USER CODE BEGIN I2C1_MspDeInit 1 */
     
     /* USER CODE END I2C1_MspDeInit 1 */
     }
     
    }
     
    /* USER CODE BEGIN 1 */
     
    /* USER CODE END 1 */
     
    /**
     * @}
     */
     
    /**
     * @}
     */
     
    /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/