[maemo-developers] Audio in on N800 and N810

[From: Klaus Rotter]

david.hagood at gmail.com wrote:
> What software are you using for PSK-31?

A hildon modified version of gpsk31, which I call MaemoPSK31. GPSK31 
uses plain gtk calls to build its gui, so there weren't that much 
changes to get it running on the N800. I modified the waterfall code and 
of course the gui to made it fit better. I have to add Logbook code and 
general preferences (the original GPSK31 uses a rc file and has no gui 
code for that).

Unfortunately, there are issues with line in. Also, you need a external 
keyboard to do it right. It runs well inside scratchbox. I made a 
picture. You can view it at:

https://garage.maemo.org/frs/download.php/2391/MaemoPSK31.png

If it is really usable on the device, I will add a own garage project 
for it.

The N800/810 use the OMAP 2420, which has a floating point unit (vfp). 
So you don't have to use those integer routines for FFT and PSK31 
decoding. ARM cpu's without vfp are too slow, so one must use integer 
optimized programs. I work also on a QT version for the sharp Zaurus. 
But this is processing slowly, because of the missing FPU. But the 
Zaurus (I own a 5500) has a keyboard, a serial port and a microphone in, 
so it will fit nicely for an application like this. The N800/810 has no 
easy accessible serial port for rig control. If you want to use the 
N800/810, you have to use VOX conrol.

bye, Klaus (DO4KR)

-- 
Klaus Rotter * klaus <at> rotters <dot> de * www.rotters.de