CH32L103 后备寄存器（BKP）与循环冗余校验（CRC）应用

/*********************************************************************

 * @fn      BKP_RTCOutputConfig

 *

 * [url=home.php?mod=space&uid=247401]@brief[/url]   Select the RTC output source to output on the Tamper pin.

 *

 * @param   BKP_RTCOutputSource - specifies the RTC output source.

 *            BKP_RTCOutputSource_None - no RTC output on the Tamper pin.

 *            BKP_RTCOutputSource_CalibClock - output the RTC clock with

 *        frequency divided by 64 on the Tamper pin.

 *            BKP_RTCOutputSource_Alarm - output the RTC Alarm pulse signal

 *        on the Tamper pin.

 *            BKP_RTCOutputSource_Second - output the RTC Second pulse

 *        signal on the Tamper pin.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]  none

 */

void BKP_RTCOutputConfig(uint16_t BKP_RTCOutputSource)

{

    uint16_t tmpreg = 0;



    tmpreg = BKP->OCTLR;

    tmpreg &= OCTLR_MASK;

    tmpreg |= BKP_RTCOutputSource;

    BKP->OCTLR = tmpreg;

}

/*********************************************************************

 * @fn      BKP_SetRTCCalibrationValue

 *

 * [url=home.php?mod=space&uid=247401]@brief[/url]   Sets RTC Clock Calibration value.

 *

 * @param   CalibrationValue - specifies the RTC Clock Calibration value.

 *            This parameter must be a number between 0 and 0x1F.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]  none

 */

void BKP_SetRTCCalibrationValue(uint8_t CalibrationValue)

{

    uint16_t tmpreg = 0;



    tmpreg = BKP->OCTLR;

    tmpreg &= OCTLR_CAL_MASK;

    tmpreg |= CalibrationValue;

    BKP->OCTLR = tmpreg;

}

/********************************** (C) COPYRIGHT *******************************

* File Name          : main.c

* Author             : WCH

* Version            : V1.0.0

* Date               : 2024/02/21

* Description        : Main program body.

*********************************************************************************

* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.

* Attention: This software (modified or not) and binary are used for 

* microcontroller manufactured by Nanjing Qinheng Microelectronics.

*******************************************************************************/



/*

 *@Note

 CRC routine:

 Use CRC-32 polynomial 0x4C11DB7.



 */



#include "debug.h"



/* Global define */

#define Buf_Size 32



/* Global Variable */

u32 SRC_BUF[Buf_Size] = {0x01020304, 0x05060708, 0x090A0B0C, 0x0D0E0F10,

                         0x11121314, 0x15161718, 0x191A1B1C, 0x1D1E1F20, 0x21222324, 0x25262728,

                         0x292A2B2C, 0x2D2E2F30, 0x31323334, 0x35363738, 0x393A3B3C, 0x3D3E3F40,

                         0x41424344, 0x45464748, 0x494A4B4C, 0x4D4E4F50, 0x51525354, 0x55565758,

                         0x595A5B5C, 0x5D5E5F60, 0x61626364, 0x65666768, 0x696A6B6C, 0x6D6E6F70,

                         0x71727374, 0x75767778, 0x797A7B7C, 0x7D7E7F80};



u32 CRCValue = 0;



/*********************************************************************

 * @fn  RecalculateCRC

 *

 * [url=home.php?mod=space&uid=247401]@brief[/url] The function RecalculateCRC calculates the CRC value of a given buffer and sets the ID register to a

 *      specific value.

 *

 * @param SRC_BUF SRC_BUF is the source buffer, which is a pointer to the start of the data that needs

 *      to be used for CRC calculation.

 *        suze The parameter "suze" is likely a typo and should be "size". It represents the size of

 *      the source buffer in bytes.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url] the calculated CRC value as a uint32_t.

 */

uint32_t RecalculateCRC(uint32_t *SRC_BUF, uint32_t suze)

{

    uint32_t temp;

    if (CRC_GetIDRegister() == 0xaa)

        CRC_ResetDR();

    temp = CRC_CalcBlockCRC((u32 *)SRC_BUF, suze);

    CRC_SetIDRegister(0xaa);

    return temp;

}



/**

 * @fn CRC_Is_Used

 *

 * [url=home.php?mod=space&uid=247401]@brief[/url] The function checks if the CRC module is being used by comparing the ID register value to 0xaa and

 * returns 1 if it is being used, otherwise it returns 0.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url] a value of type uint8_t, which is an 8-bit unsigned integer. The function is checking if the

 * value returned by the CRC_GetIDRegister() function is equal to 0xaa. If it is, the function returns

 * 1. If it is not, the function returns 0.

 */

uint8_t CRC_Is_Used()

{

    if (CRC_GetIDRegister() == 0xaa)

        return 1;

    else

        return 0;

}



/*********************************************************************

 * @fn      main

 *

 * @brief   Main program.

 *

 * @return  none

 */

int main(void)

{

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    SystemCoreClockUpdate();

    Delay_Init();

    USART_Printf_Init(115200);

    printf("SystemClk:%d\r\n", SystemCoreClock);

    printf("ChipID:%08x\r\n", DBGMCU_GetCHIPID());

    printf("CRC TEST\r\n");

    RCC_HBPeriphClockCmd(RCC_HBPeriph_CRC, ENABLE);



    CRC_Is_Used() ? printf("CRC is not clear\r\n") : printf("CRC is clear\r\n");

    /* The code is calling the function `RecalculateCRC` with the arguments `SRC_BUF` and `Buf_Size`. */

    CRCValue = RecalculateCRC(SRC_BUF, Buf_Size);



    printf("CRCValue: 0x%08X\r\n", CRCValue); /* CRCValue should be 0x199AC3CA in this example */



    CRC_Is_Used() ? printf("CRC is not clear\r\n") : printf("CRC is clear\r\n");

    while (1)

        ;

}