pwarren/PSDR
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9 commits

Author SHA1 Message Date
Michael Colton
6a7b46d523 Huge improvement in display. It was basically a bug that made it so hard to read. Playing with an IF shift feature, and filtering and stuff. I think the overlap-discard is not quite right yet.... 2014-07-22 22:55:50 -06:00
Michael Colton
9d045be4ce Starting to implement overlap-discard in the DSP code. I think maybe I've gotten it working, with a pretty large improvement in audio, but reception was so bad I had a hard time finding things to listen to to test it with. Also added the ability to switch mode (LSB & AM). 2014-07-21 08:50:38 -06:00
Michael Colton
50fbaf3920 The beginnings of AM demodulation. I think it works, but it doesn't sound good at all (then again, SSB leaves something to be desired as well.) Graphical display of filter (nice!) Doesn't crash if you set the FFT size to 1024. 2014-07-15 00:15:39 -06:00
Michael Colton
31de146601 The main thing here is moving the FFT/Filtering/IFFT to a timer interrupt that has a lower priority than the audio capture/playback timer interrupt. This way I don't care how slow the display code runs in the main loop (for now) enabling me to have the audio processing and the display working at the same time. 2014-07-14 01:41:46 -06:00
Michael Colton
71b87a38d7 Added a crude Automatic Gain Control (AGC) that's happening on the audio output side. I want to add one for the RF side as well, but I'll need to change the hardware to do it. 
Also fixed some weirdness with the filter menu items.
Verified that the recent changes to applyCoefficients() function are good and necessary to the proper operation of the filter.
 2014-07-08 09:56:47 -06:00
Michael Colton
28ebb2009f Menu system is improved. Arbitrary filter control is working pretty well. You can set the upper and lower bounds of the filter and that's pretty neat! Strange to say, but this radio now beats my Yaesu FT-817 for filter performance (by a whole lot). 2014-07-06 23:41:57 -06:00
Michael Colton
7b1da77c21 Haven't committed in a while :o . Currently waterfall is disabled while I work on audio processing. I am capturing, FFT, filter, IFFT, and output. It seems to be working partly. I don't think I am doing things right yet. 
Also, starting to implement the menu system. Oh, and fixed some indentation, so it looks like there was more changed to main() than there really was....
 2014-07-06 21:20:00 -06:00
Michael Colton
8c308e12c0 Got a timer up and going, and it's firing interrupts! Next up is to change the audio capture to use the interrupt and some buffers. Basically separate the display loop stuff. 2014-06-23 00:00:31 -06:00
Michael Colton
ffcb904b66 Initial commit to GitHub. 
Includes the Source (as an Eclipse project) and the Hardware files (including schematic, layout, gerbers, and bill of materials.)

The firmware is extremely incomplete. At this point the DDS chips work (with controlled phase relationship), the LCD (with fast-ish SPI, scrolling, and GFX, modified from Adafruit's library), the encoder knob, and LED work.

The ADC is capturing, but not in a usable way, but it's enough to feed the DSP code and see a nice pretty waterfall. Timers, interrupts, and DACs are not working yet.
 2014-06-22 17:49:43 -06:00