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发表于 2020-8-18 00:30:15
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- /*********************************************************************
- * SEGGER Microcontroller GmbH *
- * The Embedded Experts *
- **********************************************************************
- * *
- * (c) 2014 - 2020 SEGGER Microcontroller GmbH *
- * *
- * www.segger.com Support: support@segger.com *
- * *
- **********************************************************************
- * *
- * All rights reserved. *
- * *
- * Redistribution and use in source and binary forms, with or *
- * without modification, are permitted provided that the following *
- * conditions are met: *
- * *
- * - Redistributions of source code must retain the above copyright *
- * notice, this list of conditions and the following disclaimer. *
- * *
- * - Neither the name of SEGGER Microcontroller GmbH *
- * 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 SEGGER Microcontroller GmbH 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. *
- * *
- **********************************************************************
- -------------------------- END-OF-HEADER -----------------------------
- File : main.c
- Purpose : Example application doing a CRC check using the STM32 CRC peripheral
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include "stm32f4xx.h"
- #define FLASH_IMAGE_START 0x08000000
- #define FLASH_IMAGE_END 0x0807FFFC
- #define FLASH_APPLICATION_END (FLASH_IMAGE_END - 0x4)
- /*********************************************************************
- *
- * main()
- *
- * Function description
- * Application entry point.
- */
- int main(void) {
- int i;
- unsigned int NumItems;
- unsigned int* pData;
- unsigned int CRCResultHW;
- unsigned int CRCResult;
- unsigned int OldValue;
-
- i = 0;
- NumItems = (FLASH_APPLICATION_END - FLASH_IMAGE_START) / 4;
- pData = (unsigned int*)FLASH_IMAGE_START; // points to start of Flash
- CRCResult = *(unsigned int*)FLASH_IMAGE_END; // Saves CRC value calculated by SEGGER Linker
- //
- // Config CRC Module
- //
- RCC->AHB1ENR |= RCC_AHB1ENR_CRCEN;
- CRC->CR |= CRC_CR_RESET;
- //
- // Calculate CRC with ST CRC unit over complete Flash area
- //
- do {
- CRC->DR = __REV(*pData); // ST algorithm expects words in reversed order
- pData++;
- } while (NumItems--);
- CRCResultHW = CRC->DR;
- printf("Hardware calculated CRC over Flash is: 0x%X \n", CRCResultHW);
- printf("SEGGER Linker calculated CRC over Flash is: 0x%X\n", CRCResult);
- //
- // Compare with Linker result
- //
- if (CRCResult == CRCResultHW) {
- printf("Both CRC check sums are matching!\n");
- } else {
- printf("CRC check sums are not matching. Check parameters.\n");
- }
- do {
- i++;
- } while (1);
- }
- /*************************** End of file ****************************/
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发表于 2020-8-11 16:00:26
发表于 2020-8-12 19:34:21
