Re: [Gumstix-users] Producing a square wave on a gumstix GPIO

[Ryan R. <rjr...@uc...>]

Maybe a second thread to do the beeping? Then the main thread just 
signals. I'd still worry about the buzzer thread getting preempted 
though. Now that I think about it, the serial port produces a nice clean 
square wave. By playing with the data and the baud rate you could 
probably make it work ok. Then all you need to do is write the proper 
data to the buffer and be on your way. You'd need an amplifier circuit 
to isolate the UART from the buzzer, but an op-amp or a properly wired 
transistor should work nicely for that.

Ryan

Scott Harris wrote:
> I need to generate a square wave on a gumstix GPIO pin in order tor 
> drive a piezo buzzer for user feedback.  I'd like to achieve this in 
> python if possible, but I'm not averse to writing some C code to do 
> fiddle with pxaregs. I also need the beeper code not to block my main 
> python loop, since that code is pretty busy.
>
>
> Does anyone have some suggestions on a minimum hassle path to achieve 
> this?
>
> Thanks,
> -Scott
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