common setup for python crc (6.1.1) and stm32 hardware CRC unit?

Question

I'm sending data from python code to stm32g0xx mcu. I'm using stm32 hardware CRC computing unit and https://pypi.org/project/crc/ as the other side. Unfortunately I can't catch the common setup for both sides.

The mcu side is configured in the default way:

            hcrc.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
            hcrc.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE;
            hcrc.Init.CRCLength = CRC_POLYLENGTH_32B;
            hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;
            hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;
            hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;

On the python side, I'm trying every setup with the same polynomial 0x04C11DB7 (CRC32, BZIP2 and POSIX) but haven't succeeded yet.

Can you please recommend me a better way instead of trying every possible combination?

Thx

Answer 1

The magic formula for the python code to be compatible with the STM32 default is:

from crc import Calculator, Configuration

config = Configuration(
    width=32,
    polynomial=0x04C11DB7,
    init_value=0xffffffff,
    final_xor_value=0,
    reverse_input=False,
    reverse_output=False,
)

Thanks to @Ilya who confirmed my own thoughts I already had at the time.