Marcelo Rodrigues wrote:
> Hi All
>
> I`m developing a program and it have to do basically 4 tasks:
>
> 1 - read 4 push-buttons
> 2 - process the commands according to the read buttons
> 3 - load a screen in the internal buffer
> 4 - write the buffer to the LCD
>
> The push-button read function, once called, takes about 4ms, each button 
> is
> read in intervals of 1ms and LCD write function, once called, takes about
> 32ms, each of the 32 characters are written in intervals of 1ms.
>
> My question is about the hardware interfacing functions (1 and 4), which 
> is
> the best frequency to call them?
>
> I`ve already tried to call them in intervals of 100ms, it worked, but is 
> it
> the best way to do it? or it is better to call them in the main loop of 
> the
> code with no time interval?

For a simple application like this, calling the functions in the main loop 
as fast as possible seems like the simplest solution. You really only want 
to synchronize to a tick when timing is important.

Vitaliy 

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