Flash programming sequence error caused by incorrect write procedure

[ost-ing]

I've noticed that in certain circumstances the flash controller returns BankError::PROGRAMMING_SEQUENCE.

It doesn't seem to happen in all circumstances, but the following doesn't work for me within my application:

let mut buffer: [u8; 256] = [0xFF; 256];
// ... fill buffer with data
flash.erase_sector(Bank::UserBank2, 7).unwrap();
flash
    .write_sector(Bank::UserBank2, 7, 0, &buffer)
    .unwrap();

I believe the issue is due to an incorrect write procedure regarding the program enable bit (PG1/2)

cc. @richardeoin @lachlansneff-parallel

Kind regards

[ost-ing]

@richardeoin , please see https://github.com/stm32-rs/stm32h7xx-hal/pull/383

[richardeoin]

Closed by #383