Compute the 32-bit CRC value of a message

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    CRC/CRC_32BitsCRCMessage/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the 32-bit CRC value of a message example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *   
  ******************************************************************************
   

Example Description

This example aims to show how to use the CRC peripheral in order to compute 32-bit CRC checksum of a message. The CRC peripheral is configured to use the 32-bit CRC polynomial X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 +X8 + X7 + X5 + X4 + X2+ X +1 with the initialization value set to 0. The message is declared as an array and labeled "CRCBuffer". Once the CRC value is computed, the computed CRC value is compared to the expected one. In case of match the green led LD1 is turned on. Otherwise the led LD3 is turned on.

Directory contents

• CRC/CRC_32BitsCRCMessage/stm320xx_conf.h Library Configuration file
• CRC/CRC_32BitsCRCMessage/stm32f0xx_it.c Interrupt handlers
• CRC/CRC_32BitsCRCMessage/stm32f0xx_it.h Interrupt handlers header file
• CRC/CRC_32BitsCRCMessage/main.c Main program
• ADC/CRC_32BitsCRCMessage/main.h Main program header file
• CRC/CRC_32BitsCRCMessage/system_stm32f0xx.c STM32F0xx system source file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration system and can be easily customized to your own configuration. To select different clock setup, use the "STM32F0xx_Clock_Configuration_VX.Y.Z.xls" provided with the AN4152 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F0xx Devices.

• This example has been tested with STMicroelectronics STM320518-EVAL and STM32072B-EVAL including respectively STM32F051R8T6 and STM32F072VBT6 devices and can be easily tailored to any other supported device and development board.

• STM320518-EVAL Set-up
  • LD1 and LD3 are used in this example.

• STM32072B-EVAL Set-up
  • LD1 and LD3 are used in this example.

How to use it ?

In order to make the program work, you must do the following :

• Copy all source files from this example folder to the template folder under Project
• Open your preferred toolchain
• If the used device is STM32F051R8T6 choose STM32F051 project
  • Add the following files to the project source list
    • Utilities\STM32_EVAL\STM320518_EVAL\stm320518_eval.c
• If the used device is STM32F072VBT6 choose STM32F072 project
  • Add the following files to the project source list
    • Utilities\STM32_EVAL\STM32072B_EVAL\stm32072b_eval.c
• Rebuild all files and load your image into target memory
• Run the example

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