Hi Elad,

Thanks for that!  I managed to get to this late yesterday and had some success.

I downloaded a beep-beep WAV file from off the internet and that worked but was very scratchy to listen to. I'll grab 
something else today and see how that goes.

I could only run the wave utility a couple of times. After that it would do nothing other than to output some stuff to 
the terminal. A reboot gets it going again but again only for a couple of tries.

I am totally unfamiliar with the terminology used with this stuff - specifically the arguments/options for both io-audio
 and wave. The documentation for both state what they are but not what they do or mean.Some obviously don't have 
relevance to what I am doing but others I suspect do. Is there anywhere I can go to find out more about how these audio 
systems/drivers work?

I'll try to play more today - it's difficult as I am surrounded by those who I'm hoping to surprise if I can get this 
working! :-)

Regards,

Geoff.

> Hi Geoff,
> 
> Not an audio expert, but this use case can be handled easily.
> 
> 1. Add deva-ctrl-bcm2711_pwm.so to the build file (if it's not already there)
> 2. Start io-audio: 
> 
>  # io-audio -m pool_name=below1G,pool_size=260 -vd bcm2711_pwm
> 
> 3. Use the 'wave' utility to play any WAV file.
> 
> Not an audiophile's experience, but good enough to fool a hungry coyote ;-)
> 
> --Elad
> 
> On Sun, 2022-09-04 at 19:09 -0400, Geoff Roberts wrote:
> > Hello,
> > 
> > I am involved in a project with some young scientists. The project is called
>  "Road Runner". We are looking to do the first test run of the hardware and 
> software this coming Friday. All the software being used is under QNX 7.1.
> > 
> > It turned out that we need to temporarily use a Raspberry Pi4 for something.
>  It occurred to me that with its audio capabilities it would be a good morale 
> booster to be able to issue in some way a "beep-beep" and/or similar sounds 
> when significant events occur.
> > 
> > However, I have never used the audio stuff (io-audio) before and don't know 
> where to start - or even if this is possible on the RPi. I assume it is though
> .
> > 
> > I have looked at the RPi4 BSP documentation and found the bit about io-audio
>  of little use. At least to a novice in this area like me! it looks like other
>  stuff is required.
> > 
> > Could someone help me by pointing me in the direction of any resources that 
> might get me started with this - with examples if possible? I think all I'd 
> want to do is play a short MP3 file or something like that. A double "chirp" 
> would probably do if "beep" wasn't possible.
> > 
> > Any help with this would be much appreciated! :-)
> > 
> > Thanks,
> > 
> > Geoff.
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > 
> > OSTech
> > http://community.qnx.com/sf/go/post121909
> > To cancel your subscription to this discussion, please e-mail ostech-core_os
> -unsubscribe@community.qnx.com