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    • How to use HAL_FLASH_Program_IT ?

    Posted by remmy on 2016-08-25 17:21

    How to use HAL_FLASH_Program_IT ?

    I got HAL_FLASHEx_Erase() and HAL_FLASH_Program() working OK
    But it is blocking code and want to avoid using it.

    When I try HAL_FLASHEx_Erase_IT() the return value seems to say everything went OK,
    but when I do HAL_FLASH_Program_IT() it return value suggest its busy and does not write anything.
    Even if I put 100ms delays between erase and program, its still busy.

    Seems like some interrupt not enabled - but not sure which interrupt needs
    enabling as it escapes documentation time and time again in all the various
    available documentation and forums. 😬

    Reads: 19845
    Posted by jimfred on 2017-08-09 21:41

    Make sure the NVIC is configured for flash interrupts. If using CubeMX, enable NVIC Flash intterupt and expect CubeMX to generate FLASH_IRQHandler() that calls HAL_FLASH_IRQHandler() in the xxx_it.c file. A breakpoint can be used to ensure that FLASH_IRQHandler() or HAL_FLASH_IRQHandler() are bing called.

    You can define a HAL_FLASH_EndOfOperationCallback to perform some operation upon completion. Or, you can look at pFlash.ProcedureOnGoing == FLASH_PROC_NONE to know the operation is complete.

    Note that if the purpose of using HAL_FLASH_Program_IT is to erase flash asynchronously while running from flash, it will not work as expected. Expect execution from flash to freeze while an erase is in-progress which effectively means HAL_FLASH_Program_IT() will block until complete. If you're executing from RAM, this blocking won't occur.