CRC使用库函数很容易

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

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * $Revision: 2 $

 * $Date: 20/05/28 4:41p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Implement CRC in CRC-8 mode and get the CRC checksum result.

 *

 * SPDX-License-Identifier: Apache-2.0

 * Copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "NuMicro.h"



void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable HIRC clock */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC and HCLK source divide 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Enable UART0 clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Switch UART0 clock source to HIRC */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));



    /* Enable CRC clock */

    CLK_EnableModuleClock(CRC_MODULE);



    /* Update System Core Clock */

    SystemCoreClockUpdate();



    /* Set PB multi-function pins for UART0 RXD=PB.12 and TXD=PB.13 */

    SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk))

                    |(SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);



    /* Lock protected registers */

    SYS_LockReg();

}



/*---------------------------------------------------------------------------------------------------------*/

/*  MAIN function                                                                                          */

/*---------------------------------------------------------------------------------------------------------*/

int main(void)

{

    const uint8_t acCRCSrcPattern[] = {0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39};

    uint32_t i, u32TargetChecksum = 0x58, u32CalChecksum = 0;



    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Init System, peripheral clock and multi-function I/O */

    SYS_Init();



    /* Lock protected registers */

    SYS_LockReg();



    /* Init UART0 to 115200-8n1 for print message */

    UART_Open(UART0, 115200);



    printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);

    printf("+-----------------------------------------+\n");

    printf("|    CRC-8 Polynomial Mode Sample Code    |\n");

    printf("+-----------------------------------------+\n\n");



    printf("# Calculate [0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39] CRC-8 checksum value.\n");

    printf("    - Seed value is 0x5A             \n");

    printf("    - CPU write data length is 8-bit \n");

    printf("    - Checksum complement disable    \n");

    printf("    - Checksum reverse disable       \n");

    printf("    - Write data complement disable  \n");

    printf("    - Write data reverse disable     \n");

    printf("    - Checksum should be 0x%X        \n\n", u32TargetChecksum);



    /* Configure CRC controller for CRC-8 CPU mode */

    CRC_Open(CRC_8, 0, 0x5A, CRC_WDATA_8);



    /* Start to execute CRC-8 CPU operation */

    for(i = 0; i < sizeof(acCRCSrcPattern); i++)

    {

        CRC_WRITE_DATA(acCRCSrcPattern[i]);

    }



    /* Get CRC-8 checksum value */

    u32CalChecksum = CRC_GetChecksum();

    printf("CRC checksum is 0x%X ... %s.\n", u32CalChecksum, (u32CalChecksum == u32TargetChecksum) ? "PASS" : "FAIL");



    /* Disable CRC function */

    CLK_DisableModuleClock(CRC_MODULE);



    while(1);

}



/*** (C) COPYRIGHT 2020 Nuvoton Technology Corp. ***/