On Wed, 2016-09-07 at 14:19 -0800, Britton Kerin wrote: > I remember reading somewhere in avr libc docs to do e.g. this: > > PCIFR = _BV (some_bit) > loop_until_bit_is_clear (PCIFR, some_bit); > > This may be a bad example becuase of the odd write-one-to-clear > semantics. That isn't the point here, I don't remember which > registers this advice applied to. And I can't find it now. > > > The only thing I could find in the datasheet that related to this was > in section 13.2.4 of ATMega328P datasheet, where it says that you > have to wait a cycle after assigning an output pin value before > reading it back in. > > Are there other cases where loop_until_* or a nop is required? > The only thing I can think of is writing to the EEPROM. You can also use that function to block waiting for a flag to be set by a timer, interrupt or other peripheral.
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