topic Re: CRC seed value for MC33GD3100 in Power Management

CRC seed value for MC33GD3100

MarcoDeg — Wed, 28 Jun 2023 15:19:34 GMT

Hello,

in the datasheet for the MC33GD3100 I believe the is a mistake: the CRC seed is stated to be 11111111,

however on the software example and in the manual for the GD3162 is 0x42.

Re: CRC seed value for MC33GD3100

guoweisun — Thu, 29 Jun 2023 00:47:52 GMT

I will double check this!

Re: CRC seed value for MC33GD3100

guoweisun — Thu, 29 Jun 2023 01:18:04 GMT

I am not familiar with this demo code, but please design your CRC software code according the data sheet states.

Re: CRC seed value for MC33GD3100

MarcoDeg — Tue, 04 Jul 2023 14:23:50 GMT

Hello, I did manage to test some software on a board that has the GD3100, and the sw is as per the NXP example:

static unsigned char Calculate_SPI_CRC(unsigned short wData) { uint8_t tbl_idx; uint8_t crc; uint16_t len = 2; uint8_t data[2]; data[0] = wData & 0xFF; data[1]= (wData >> & 0xFF; crc = 0x42; // seed while (len) { len--; tbl_idx = (crc ^ *(data + len)); crc = crc_table[tbl_idx]; } return crc; }

Hence I do believe the datasheet is wrong.