mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
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245 lines
7.2 KiB
C
245 lines
7.2 KiB
C
/**
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******************************************************************************
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* @file Examples_MIX/CRC/CRC_CalculateAndCheck/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use the STM32F4xx CRC HAL API
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* to compute a CRC code of a given buffer of data words (32-bit).
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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#include "stm32f4xx_ll_crc.h"
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/** @addtogroup STM32F4xx_HAL_Examples
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* @{
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*/
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/** @addtogroup CRC_CalculateAndCheck
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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#define BUFFER_SIZE 9 /* 9 u32 */
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* CRC handler declaration */
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CRC_HandleTypeDef CrcHandle;
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/* Used for storing CRC Value */
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__IO uint32_t uwCRCValue = 0;
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static const uint32_t aDataBuffer[BUFFER_SIZE] =
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{
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0x00001021, 0x20423063, 0x408450a5,
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0x60c670e7, 0x9129a14a, 0xb16bc18c,
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0xd1ade1ce, 0xf1ef1231, 0x32732252
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};
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/* Expected CRC Value */
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uint32_t uwExpectedCRCValue = 0xFF813A5C;
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/* Private function prototypes -----------------------------------------------*/
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static void SystemClock_Config(void);
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static void Error_Handler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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register uint32_t index = 0;
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/* STM32F4xx HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Set NVIC Group Priority to 4
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 100 MHz */
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SystemClock_Config();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/*##-1- Configure the CRC peripheral #######################################*/
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CrcHandle.Instance = CRC;
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if (HAL_CRC_Init(&CrcHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/*##-2- Compute the CRC of "aDataBuffer" ###################################*/
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uwCRCValue = HAL_CRC_Calculate(&CrcHandle, (uint32_t *)&aDataBuffer, BUFFER_SIZE);
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/*##-3- Compare the CRC value to the Expected one ##########################*/
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if (uwCRCValue != uwExpectedCRCValue)
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{
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/* Wrong CRC value: enter Error_Handler */
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Error_Handler();
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}
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else
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{
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/*##-4- Compute the CRC of "aDataBuffer" ###################################*/
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/* Reset the CRC calculation unit */
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LL_CRC_ResetCRCCalculationUnit(CRC);
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/* Compute the CRC of Data Buffer array*/
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for (index = 0; index < BUFFER_SIZE; index++)
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{
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LL_CRC_FeedData32(CRC, aDataBuffer[index]);
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}
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uwCRCValue = LL_CRC_ReadData32(CRC);
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/*##-5- Compare the CRC value to the Expected one ##########################*/
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if (uwCRCValue != uwExpectedCRCValue)
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{
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/* Wrong CRC value: enter Error_Handler */
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Error_Handler();
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}
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else
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{
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/* Right CRC value: Turn LED2 on */
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BSP_LED_On(LED2);
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}
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}
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/* Infinite loop */
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while (1)
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{
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}
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 100000000
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* HCLK(Hz) = 100000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSI Frequency(Hz) = 8000000
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* PLL_M = 8
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* PLL_N = 400
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* PLL_P = 4
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* PLL_Q = 7
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* VDD(V) = 3.3
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* Main regulator output voltage = Scale1 mode
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* Flash Latency(WS) = 3
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* @param None
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* @retval None
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*/
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static void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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RCC_OscInitTypeDef RCC_OscInitStruct;
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/* Enable Power Control clock */
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__HAL_RCC_PWR_CLK_ENABLE();
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/* The voltage scaling allows optimizing the power consumption when the device is
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clocked below the maximum system frequency, to update the voltage scaling value
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regarding system frequency refer to product datasheet. */
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__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
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/* Enable HSI Oscillator and activate PLL with HSI as source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLM = 8;
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RCC_OscInitStruct.PLL.PLLN = 400;
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RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
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RCC_OscInitStruct.PLL.PLLQ = 7;
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if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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Error_Handler();
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
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{
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Error_Handler();
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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while (1)
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{
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/* Error if LED2 is slowly blinking (1 sec. period) */
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BSP_LED_Toggle(LED2);
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HAL_Delay(1000);
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}
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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