STM32H7xx HAL_FLASHEx_ComputeCRC Burst Size Bug

[mycodeworksIdontknowwhy]

Original post: https://community.st.com/t5/stm32-mcus-products/stm32h7-flash-crc/td-p/887279

Github: https://github.com/STMicroelectronics/stm32h7xx-hal-driver/blob/1501be883dae6f202c1d3f856ee6b11407dc257d/Src/stm32h7xx_hal_flash_ex.c#L733

HAL_StatusTypeDef HAL_FLASHEx_ComputeCRC(FLASH_CRCInitTypeDef *pCRCInit, uint32_t *CRC_Result)
{
...
...
        FLASH->CRCCR1 |= FLASH_CRCCR_CLEAN_CRC | pCRCInit->BurstSize | pCRCInit->TypeCRC;
...
...
}


|= will not program the expected burst size if the reset value is not b00. It looks like on reset the value is b01 (16 flash words). So if user try to set to burst size of 4 flash words (b00) it'll remain set to b01.

[Saket_Om]

Hello @mycodeworksIdontknowwhy 

Thank you for bringing this issue to our attention.

I reported this internally.

Internal ticket number: CDM0062824 (This is an internal tracking number and is not accessible or usable by customers).