238 lines
7.0 KiB
C
238 lines
7.0 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 STM32F1xx 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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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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 "stm32f1xx_ll_crc.h"
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/** @addtogroup STM32F1xx_MIX_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
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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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/* STM32F103xB 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 72 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) = 72000000
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* HCLK(Hz) = 72000000
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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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* PLLMUL = 9
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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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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/* Configure PLL ------------------------------------------------------*/
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/* PLL configuration: PLLCLK = HSE * PLLMUL = 8 * 9 = 72 MHz */
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/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 72 / 1 = 72 MHz */
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/* Enable HSE and activate PLL with HSE as source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
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RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
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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.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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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.APB2CLKDivider = RCC_HCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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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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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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