[avr-libc-dev] [bug #30363] _delay_xx() functions in <util/delay.h> are broken

[Anitha Boyapati]

Follow-up Comment #6, bug #30363 (project avr-libc):

Bill Perry's patch doesn't define the following cases:

1. The maximum delay that can be provided in _ms.

With the new implementation, the values change. If delay_ms() is considered,
maximum delay that can be provided is:

_ms = (2^32-1)*(10^-3) /F_CPU in MHz
    = 4294967.295

(Note that the maximum value that can be given to
__builtin_avr_delay_cycles() is 0xFFFF FFFF )

If the requested delay is greater than the above value in milli seconds, can
the approach be similar to earlier one where the resolution is decreased to
1/10 ms?

2. Similarly maximum delay that can be provided in _us. (Resolution is not
decreased in this case, but delay_ms will be called for values greater than
(2^32-1)/F_CPU)

Comments... ?


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