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