杰发科技AC7801——读取Flash数据做CRC校验

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 Bytesuint32_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 dataif (tmpCRCType == CRC_PROTOCOL_32BIT) // CRC32 configuration{CRCConfig.poly = 0x4C11DB7; // CRC-32 Poly: 0x4C11DB7CRCSeed = 0xFFFFFFFF;       // CRC-CCITT seed: 0xFFFFFFFFCRCConfig.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。