nano100的CRC操作

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V2.10

 * $Date: 15/06/30 11:25a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Calculate the CRC-CCITT checksum value by CRC DMA mode.

 *

 * @note

 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include <string.h>

#include "nano100series.h"



uint8_t volatile g_u8IsTargetAbortINTFlag = 0, g_u8IsBlockTransferDoneINTFlag = 0;



/**

 * @brief       DMA IRQ

 *

 * @param       None

 *

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

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     The DMA default IRQ, declared in startup_nano100series.s.

 */

void PDMA_IRQHandler(void)

{

    uint32_t status = CRC_GET_INT_FLAG();

    if (status & DMA_CRC_DMAISR_BLKD_IF_Msk) {

        /* Clear Block Transfer Done Interrupt Flag */

        CRC_CLR_INT_FLAG(DMA_CRC_DMAISR_BLKD_IF_Msk);



        g_u8IsBlockTransferDoneINTFlag++;

    } else if (status & DMA_CRC_DMAISR_TABORT_IF_Msk) {

        /* Clear Target Abort Interrupt Flag */

        CRC_CLR_INT_FLAG(DMA_CRC_DMAISR_TABORT_IF_Msk);



        g_u8IsTargetAbortINTFlag++;

    } else {

        printf("Un-expected interrupts. \n");

    }

}



void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable external 12MHz HXT */

    CLK_EnableXtalRC(CLK_PWRCTL_HXT_EN_Msk);

    CLK_EnablePLL(CLK_PLLCTL_PLL_SRC_HXT, 96000000);

    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_HXT_STB_Msk | CLK_CLKSTATUS_PLL_STB_Msk);



    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_HCLK_CLK_DIVIDER(3));



    CLK->AHBCLK |= CLK_AHBCLK_DMA_EN_Msk;

    /* Select IP clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_UART_CLK_DIVIDER(1));

    /* Enable IP clock */

    CLK_EnableModuleClock(UART0_MODULE);



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set PA multi-function pins for UART0 RXD and TXD */

//    SYS->PA_H_MFP &= ~( SYS_PA_H_MFP_PA15_MFP_Msk | SYS_PA_H_MFP_PA14_MFP_Msk);

//    SYS->PA_H_MFP |= (SYS_PA_H_MFP_PA15_MFP_UART0_TX|SYS_PA_H_MFP_PA14_MFP_UART0_RX);

    SYS->PB_L_MFP &= ~( SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);

    SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB1_MFP_UART0_TX|SYS_PB_L_MFP_PB0_MFP_UART0_RX);



    /* Lock protected registers */

    SYS_LockReg();

}



void UART0_Init(void)

{

    /* Reset IP */

    SYS_ResetModule(UART0_RST);

    UART0->BAUD = 0x67;              /* Baud Rate:115200  OSC:12MHz */

    UART0->TLCTL = 0x03;             /* Character len is 8 bits */

}



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

/*  CRC-CCITT Polynomial Mode Test                                                                         */

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

void CRC_CCITTPolyModeTest(uint32_t u32SrcAddr, uint32_t u32TransByteCount)

{

    uint32_t u32TargetChecksum = 0x29B1, u32CalChecksum = 0;



    printf("# Calculate string \"123456789\" CRC-CCITT checksum value by CRC DMA mode. \n");

    printf("    - Seed value is 0xFFFF          \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", u32TargetChecksum);

    printf("... \n\n");



    g_u8IsTargetAbortINTFlag = g_u8IsBlockTransferDoneINTFlag = 0;



    /* Enable CRC channel clock */

    /* Configure CRC Operation Settings for CRC DMA mode */

    CRC_Open(CRC_CCITT, 0, 0xFFFF, 0);



    /* Enable DMA Target Abort and Block Transfer Done Interrupt */

    CRC_ENABLE_INT(DMA_CRC_DMAIER_TABORT_IE_Msk|DMA_CRC_DMAIER_BLKD_IE_Msk);



    /* Enable PDMA and CRC NVIC */

    NVIC_EnableIRQ(PDMA_IRQn);



    /* Trigger CRC DMA transfer */

    CRC_StartDMATransfer(u32SrcAddr, u32TransByteCount);



    /* Wait CRC Interrupt Flag occurred */

    while (1) {

        if (g_u8IsTargetAbortINTFlag == 1) {

            printf("DMA Target Abort Interrupt occurred. \n");

            break;

        }

        if (g_u8IsBlockTransferDoneINTFlag == 1) {

            break;

        }

    }



    /* Disable PDMA and CRC NVIC */

    NVIC_DisableIRQ(PDMA_IRQn);



    /* Get CRC Checksum value */

    u32CalChecksum = CRC_GetChecksum();

    if (g_u8IsBlockTransferDoneINTFlag == 1) {

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

    }



    printf("\n");

}



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

/*  CRC-8 Polynomial Mode Test                                                                             */

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

void CRC_CRC8PolyModeTest(uint32_t u32SrcAddr, uint32_t u32TransByteCount)

{

    uint32_t i = 0;

    uint32_t u32TargetChecksum = 0x58, u32CalChecksum = 0;

    uint8_t *p8SrcAddr;



    printf("# Calculate string \"123456789\" CRC-8 checksum value by CRC CPU mode. \n");

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

    printf("    - CPU Write 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", u32TargetChecksum);

    printf("... \n\n");



    p8SrcAddr = (uint8_t *)u32SrcAddr;



    /* Enable CRC channel clock */

    /* Configure CRC Operation Settings for CRC DMA mode */

    CRC_Open(CRC_8, 0, 0x5A, CRC_CPU_WDATA_8);



    for (i=0; i<u32TransByteCount; i++) {

        CRC_WRITE_DATA((p8SrcAddr[i]&0xFF));

    }



    /* Get CRC Checksum value */

    u32CalChecksum = CRC_GetChecksum();

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



    printf("\n");

}





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

/* MAIN function                                                                                           */

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

int main (void)

{

    const uint8_t acCRCSrcPattern[] = "123456789";



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

    SYS_Init(); //In the end of SYS_Init() will issue SYS_LockReg() to lock protected register. If user want to write protected register, please issue SYS_UnlockReg() to unlock protected register.



    /* Init UART for printf */

    UART0_Init();



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



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

    printf("|    NANO100 CRC Driver Sample Code    | \n");

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



    printf(" CRC-CCITT Polynomial mode test \n");

    CRC_CCITTPolyModeTest((uint32_t )acCRCSrcPattern, strlen((char *)acCRCSrcPattern));



    printf(" CRC-8 Polynomial mode test \n");

    CRC_CRC8PolyModeTest((uint32_t )acCRCSrcPattern, strlen((char *)acCRCSrcPattern));



    printf("\nExit CRC Sample Code. \n");

    while(1);

}