ROM Bootloader Get Checksum command fails

[JBill.10]

STM32G473 via SPI

I have most of the other commands working, but the Get Checksum command (0xA1) fails to return an ACK when I send the CRC init value.

I am using the default CRC configuration:

#define DEFAULT_CRC32_POLY 0x04C11DB7U

#define DEFAULT_CRC_INITVALUE 0xFFFFFFFFU

It accepts the command, start address, memory size, and polynomial, then fails on the init value.

I haven't found any documentation that indicates what init value is accepted on this MCU, but I do find it hard to believe it does not accept the default init value from the HAL itself.

[TDK]

Does it NACK?

Can you show the exact bytes you send in each step in some sort of log?

Initialization value should ACK regardless of if it can be changed.

[JBill.10]

It does not respond with a NACK, I just keep getting 0xA5 until my loop gives up after 255 tries.

It looks like the actual CRC responds as I send the init value.

I would have pasted the log file but the forum complains that I cannot include that much text and it does not accept the HTML table element.  This has all been very helpful ST, thanks.