STM32F767 如何配置硬件CRC！

hanxi0529 · 发表于 2017-11-14 13:05:47

自己配置硬件CRC 使用校验和计算。多项式位CCITT-16的 0x1201。无反转，正常顺序读写。代码如下：
void CDB_CRCInit(GM_UINT32 POLInitData)
{
RCC->AHB1ENR |= 1 << 12;    //使能CRC时钟
CRC->INIT |= 0x00000000U; //初始值为0
CRC->POL |= POLInitData; //多项式值
CRC->CR |= 0x0 << 7;
CRC->CR |= 0x0 << 5; //输入输出不反转
CRC->CR |= 0x1  << 3; //16位多项式
CRC->CR |= 0x1  << 0; //重置CR

}

GM_UINT16 crc16_8(GM_UINT8 *pBuffer, GM_UINT32 BufferLength)
{
/*按8bit运算*/
#if 1

GM_UINT8 i = 0;
CDB_CRCResetCR();  //复位CRC
CDB_CRCResetDR();  //复位数据寄存器
for(i = 0; i < (BufferLength/4); i++)
{
CRC->DR = (GM_UINT32)(((GM_UINT32)(pBuffer[4*i])<<24) | ((GM_UINT32)(pBuffer[4*i+1])<<16) | ((GM_UINT32)(pBuffer[4*i+2])<<8) | (GM_UINT32)(pBuffer[4*i+3]));
}

if((BufferLength%4) != 0)
{
if(BufferLength%4 == 1)
{
*(volatile GM_UINT8 *) (&CRC->DR) = pBuffer[4*i];
}
if(BufferLength%4 == 2)
{
*(volatile GM_UINT16 *) (&CRC->DR) = (GM_UINT16)((GM_UINT16)((GM_UINT16)(pBuffer[4*i])<<8) | (GM_UINT16)(pBuffer[4*i+1]));
}
if(BufferLength%4 == 3)
{
*(volatile GM_UINT16 *) (&CRC->DR) = (GM_UINT16)((GM_UINT16)((GM_UINT16)(pBuffer[4*i])<<8) | (GM_UINT16)(pBuffer[4*i+1]));
*(volatile GM_UINT8 *) (&CRC->DR) = pBuffer[4*i+2];
}
}
printf("hardware crc_8bit  = %x \n",CRC->DR);
return CRC->DR;

#endif

}

但是和自己软件计算的校验值完全不相同啊。。。
输入值：52 4F 01 ，正确值应该为：7D3D 、结果完全不同！！！望大神指导一下！麻烦了！！邮箱：wl237810399@foxmail.com 谢谢！