mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
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284 lines
8.0 KiB
C
284 lines
8.0 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/CRC/CRC_CalculateAndCheck/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to use CRC peripheral for generating CRC value
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* for an input data Buffer using the STM32F4xx CRC LL API.
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* Peripheral initialization done using LL unitary services functions.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 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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/** @addtogroup STM32F4xx_LL_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 36
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Used for storing CRC Value */
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__IO uint32_t uwCRCValue = 0;
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static const uint8_t aDataBuffer[BUFFER_SIZE] =
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{
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0x21, 0x10, 0x00, 0x00, 0x63, 0x30, 0x42, 0x20, 0xa5, 0x50, 0x84, 0x40,
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0xe7, 0x70, 0xc6, 0x60, 0x4a, 0xa1, 0x29, 0x91, 0x8c, 0xc1, 0x6b, 0xb1,
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0xce, 0xe1, 0xad, 0xd1, 0x31, 0x12, 0xef, 0xf1, 0x52, 0x22, 0x73, 0x32,
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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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void SystemClock_Config(void);
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void Configure_CRC(void);
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uint32_t Calculate_CRC(uint32_t);
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void CheckCRCResultValue(void);
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void LED_Init(void);
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void LED_On(void);
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void LED_Blinking(uint32_t Period);
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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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/* Configure the system clock to 100 MHz */
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SystemClock_Config();
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/* Initialize LED2 */
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LED_Init();
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/* Configure CRC (CRC IP configuration using default Polynomial value) */
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Configure_CRC();
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/* Perform CRC calculation on data contained in aDataBuffer */
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uwCRCValue = Calculate_CRC(BUFFER_SIZE);
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/* Check if CRC computed result value is equal to expected one */
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CheckCRCResultValue();
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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 This function configures CRC Instance.
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* @note This function is used to enable CRC Peripheral clock
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* @param None
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* @retval None
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*/
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void Configure_CRC(void)
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{
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/* Enable peripheral clock for CRC *********************/
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LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_CRC);
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}
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/**
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* @brief This function performs CRC calculation on BufferSize bytes from input data buffer aDataBuffer.
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* @param BufferSize Nb of bytes to be processed for CRC calculation
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* @retval 32-bit CRC value computed on input data buffer
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*/
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uint32_t Calculate_CRC(uint32_t BufferSize)
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{
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register uint32_t data = 0;
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register uint32_t index = 0;
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/* Compute the CRC of Data Buffer array*/
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for (index = 0; index < (BufferSize / 4); index++)
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{
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data = (uint32_t)((aDataBuffer[4 * index + 3] << 24) | (aDataBuffer[4 * index + 2] << 16) | (aDataBuffer[4 * index + 1] << 8) | aDataBuffer[4 * index]);
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LL_CRC_FeedData32(CRC, data);
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}
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/* Return computed CRC value */
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return(LL_CRC_ReadData32(CRC));
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}
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/**
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* @brief Check CRC computation result value.
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* @param None
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* @retval None
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*/
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void CheckCRCResultValue(void)
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{
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/* 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: Set LED2 to Blinking mode (Error) */
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LED_Blinking(LED_BLINK_ERROR);
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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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LED_On();
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}
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}
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/**
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* @brief Initialize LED2.
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* @param None
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* @retval None
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*/
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void LED_Init(void)
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{
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/* Enable the LED2 Clock */
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LED2_GPIO_CLK_ENABLE();
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/* Configure IO in output push-pull mode to drive external LED2 */
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LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
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/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
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//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
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/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
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//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
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/* Reset value is LL_GPIO_PULL_NO */
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//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
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}
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/**
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* @brief Turn-on LED2.
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* @param None
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* @retval None
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*/
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void LED_On(void)
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{
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/* Turn LED2 on */
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LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
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}
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/**
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* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
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* @param Period : Period of time (in ms) between each toggling of LED
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* This parameter can be user defined values. Pre-defined values used in that example are :
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* @arg LED_BLINK_FAST : Fast Blinking
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* @arg LED_BLINK_SLOW : Slow Blinking
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* @arg LED_BLINK_ERROR : Error specific Blinking
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* @retval None
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*/
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void LED_Blinking(uint32_t Period)
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{
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/* Toggle IO in an infinite loop */
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while (1)
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{
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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LL_mDelay(Period);
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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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* HSE 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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* 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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void SystemClock_Config(void)
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{
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/* Enable HSE oscillator */
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LL_RCC_HSE_EnableBypass();
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LL_RCC_HSE_Enable();
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while(LL_RCC_HSE_IsReady() != 1)
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{
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};
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/* Set FLASH latency */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
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LL_RCC_PLL_Enable();
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while(LL_RCC_PLL_IsReady() != 1)
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{
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};
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/* Sysclk activation on the main PLL */
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LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
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{
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};
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/* Set APB1 & APB2 prescaler */
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LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
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LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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/* Set systick to 1ms */
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SysTick_Config(100000000 / 1000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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SystemCoreClock = 100000000;
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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", 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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