We have an application that plays tones of frequencies ranging from
150 to 700 Hz. This application used ioctl() with /dev/fm under
QNX 4.25. I have not been able to find anything similar under
Neutrino. I am accessing a sound blaster compatible device,
currently under 6.1a but will be moving to 6.2 as soon as some
other issues get resolved. Does anyone know what the replacement
for /dev/fm is for Neutrino?
Any help would be greatly appreciated.
regards,
Tom
Thomas Emberson <temberson@softwareremodeling.com> wrote:
We have an application that plays tones of frequencies ranging from
150 to 700 Hz. This application used ioctl() with /dev/fm under
QNX 4.25. I have not been able to find anything similar under
Neutrino. I am accessing a sound blaster compatible device,
currently under 6.1a but will be moving to 6.2 as soon as some
other issues get resolved. Does anyone know what the replacement
for /dev/fm is for Neutrino?Any help would be greatly appreciated.
If all you’re doing is playing sine waves, I’d suggest generating
them yourself directly into the D/A port. It’s not rocket science
but for a rather large fee 
Basically, I’d create a sine[] array and precompute your sine
values into it, and then step through the sine[] array at some
fixed (precomputed) offset looping around. Done.
And, if it’s not sine waves, precompute something else into an array.
Cheers,
-RK
–
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Books, Video-based and Instructor-led
Training and Consulting at www.parse.com.
Email my initials at parse dot com.