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器件型号：TMS320F280025我努力得到 VCRC 来提供正确的值。 不确定我做了什么错误、因为我无法使用调试器查看 VCRC 寄存器。
当我从 VCU0 示例代码发出来使用 CPU 执行 CRC 时、一切都运行得很好：
uint16_t testArray3[] = {0x0100, 0x0302, 0x0504, 0x0006};
void genCRC8Table()
{
register uint16_t i;
register uint16_t j;
register uint16_t crc8_accum;
for ( i = 0; i < 256; i++ )
{
crc8_accum = i;
for ( j = 0; j < 8; j++ )
{
if ( crc8_accum & 0x80L )
crc8_accum = ( (crc8_accum << 1) & 0xff ) ^ 0x31;
else
crc8_accum = ( crc8_accum << 1 ) & 0xff;
}
crc8_table[i] = crc8_accum;
}
}
// C- function to get the 8-bit CRC
//
// \param The initial value of crc, in case the message has been
// chopped into several parts, you can use the crc8 of the previous
// segment as the init value for the current segment crc8 calculation
// until the final crc is derived.
// \param Address of the message buffer
// \param Parity of the first message byte, i.e. whether its on an even
// or odd address
// \param Length of the message in bytes
//
// Calculate the 8-bit CRC of a message buffer by using the lookup table,
// crc8_table to get the CRC of each byte.
//
// \return CRC result
//
uint16_t getCRC8_cpu (uint16_t input_crc8_accum, uint16_t * msg, CRC_parity_e parity,
uint16_t rxLen)
{
register uint16_t i;
register uint16_t j;
uint16_t crc8_accum;
int16_t *pdata;
crc8_accum = input_crc8_accum;
pdata = (int16_t *)msg;
for (j = 0; j < rxLen; j++, parity++)
{
i = crc8_accum ^ (__byte(pdata, parity));
crc8_accum = crc8_table[i];
}
return (uint16_t)crc8_accum;
}
genCRC8Table();
CRC.crcResult = getCRC8_cpu(0, testArray3, CRC_parity_even, 7);这将产生正确的结果为 0xA4（请注意，我的多项式为 0x31）。
当我尝试使用 VCRC 执行相同操作时、得到的结果为 0x8000。
// Step 1: Initialize CRC objects
CRC.seedValue = 0x00; //enter the seed value for CRC computation
CRC.nMsgBytes = 7; //enter the number of bytes on which the CRC is to be computated
CRC.nMsgBits = 0; //enter the number of bits for CRC computation
CRC.parity = CRC_parity_even; //choose to compute CRC for lower byte(8 bits) first or upper byte first based on the parity value
CRC.crcResult = 0; //CRC result would be stored in the location
CRC.pMsgBuffer = 0; //pointer to the message buffer
CRC.polynomial = 0x0031; //user polynomial
CRC.polySize = SIZE_8_BITS; //polynomial size
CRC.dataSize = SIZE_8_BITS; //data size
CRC.reflected = 0; //Whether the computation is to be done from LSB or MSB, if CRC.reflected = 1 then the data bytes would be flipped before CRC computation
CRC.init = (void (*)(void *))CRC_init8Bit; //initialize the CRC routine by context save and context restore calls
CRC.run = (void (*)(void *))CRC_runConfigPolyBytes; //point to the C routine or lookup table for CRC computation through software
// Step 2: Initialize the handle
handleCRC = &CRC;
CRC.nMsgBytes = 7; //enter the number of message bytes
CRC.pMsgBuffer = testArray3;
CRC.run(handleCRC);
有什么想法我做错了?
