查看Keil的编译结果发现总共6160个字节。计算结果如下，

代码如下

#include "ac780x_crc.h"
#include "ac780x.h"
#include "ac780x_debugout.h"
#include "string.h"
#include "ac780x_eflash.h"

#define TestSize 1024 ///< 4K
#define TestAddressStart 0x08000000
uint8_t Data[9000]; // 共6140 Bytes

uint32_t tmpResult = 0;                   /* CRC计算结果 */
uint32_t tmpCRCType = CRC_PROTOCOL_32BIT; /* CRC 支持16位和32位长度多项式 */
/**
 * @prototype main(void)
 *
 * @param[in] void
 * @return	 void
 *
 * @brief  	 main entry.
 *			 main函数.
 */

int main(void)
{
    CRC_ConfigType CRCConfig;
    memset(&CRCConfig, 0, sizeof(CRCConfig));

    CRCConfig.crcProtocolType = (CRC_ProtocolType)tmpCRCType;

    uint32_t CRCSeed = 0;

    InitDebug(); // Initialize debug UART 1

    // printf("AC7801: CRC_Demo\r\n");

    // if (tmpCRCType > 1)
    // {
    //     printf("tmpCRCType: 0: CRC-CCITT; 1: CRC-32! \r\n");
    //     return -1;
    // }

    EFLASH_UnlockCtrl();
    EFLASH_Read(TestAddressStart, (uint32_t *)Data, TestSize);
    EFLASH_Read(TestAddressStart + TestSize, (uint32_t *)Data + 256, TestSize);
    EFLASH_Read(TestAddressStart + TestSize * 2, (uint32_t *)Data + 256 * 2, TestSize);
    EFLASH_Read(TestAddressStart + TestSize * 3, (uint32_t *)Data + 256 * 3, TestSize);
    EFLASH_Read(TestAddressStart + TestSize * 4, (uint32_t *)Data + 256 * 4, TestSize);
    EFLASH_Read(TestAddressStart + TestSize * 5, (uint32_t *)Data + 256 * 5, TestSize);
    EFLASH_Read(TestAddressStart + TestSize * 6, (uint32_t *)Data + 256 * 6, 20);

    EFLASH_LockCtrl();

    printf("0x8000000  ");
    unsigned i = 0;
    while (i < 6160)
    {
        printf("%02x", Data[i]);
        i++;
        if (i % 16 == 0)
        {
            printf("\r\n0x%7x  ", 0x8000000 + i);
        }
    }

    printf("\r\n");
    // CRCDataLength = strlen((char *)CRCMsg); // Length of data

    if (tmpCRCType == CRC_PROTOCOL_32BIT) // CRC32 configuration
    {
        CRCConfig.poly = 0x4C11DB7; // CRC-32 Poly: 0x4C11DB7
        CRCSeed = 0xFFFFFFFF;       // CRC-CCITT seed: 0xFFFFFFFF
        CRCConfig.finalXOR = ENABLE;
        CRCConfig.readTransposeType = CRC_READ_TRANSPOSE_BITS_BYTES;
        CRCConfig.writeBytesNumOnce = CRC_WRITE_1_BYTE_ONCE;
        CRCConfig.writeTransposeType = CRC_WRITE_TRANSPOSE_BITS;
    }
    // else // CRC16 configuration
    // {
    //     CRCConfig.poly = 0x1021;     // CRC-CCITT Poly: 0x1021
    //     CRCSeed = 0xFFFF;            // CRC-CCITT seed: 0xFFFF
    //     CRCConfig.finalXOR = ENABLE; // disable final xor
    //     CRCConfig.readTransposeType = CRC_READ_TRANSPOSE_NONE;
    //     CRCConfig.writeTransposeType = CRC_WRITE_TRANSPOSE_BITS_BYTES;
    // }

    CRC_Init(&CRCConfig);

    // if (CRCConfig.crcProtocolType == CRC_PROTOCOL_16BIT)
    // {
    //     tmpResult = CRC_Check(CRCSeed, &CRCMsg[0], CRCDataLength);
    //     printf("CRC-CCITT, Poly:0x%X\r\n", CRCConfig.poly);
    // }
    // else
    {
        tmpResult = CRC_Check(CRCSeed, &Data[0], 6156);
        printf("CRC-32, Poly:0x%X\r\n", CRCConfig.poly);
    }
    printf("CRC result is: 0x%X\r\n", tmpResult);

    while (1)
        ;
}

发现去掉Flash内容后四位的值都是正确的，加上后四位值就不对了，这个据说是Flash的CRC值，但是跟计算出来的去掉4位的值不同。后续有空再慢慢研究。