Hi David,
Op 23-11-14 om 21:23 schreef David Rowe: > Hello Kristoff and Alex, > > Good work Kristoff on helping introduce your club to this sort of > technology. It's all part of the "demythifying digital voice / digital communication" effort :-) > > Yes FSK can run on small ADC resolutions, as what really matters for > "frequency counting" is just the sign bit. Here is a tone decoder that > works well with just 3 magnitude bits: > http://www.rowetel.com/blog/?p=3289 Well, I did notice that the APRStrack only has a 4-bit R/R2 network, so even from the encoder-side, the same principle applies. > Some times fixed point DSP works out in our favour. > -/- > > In codec2-dev/stm2 there is a README that describes how to get started > with gdb and the STM32F4 development board. I use a hacked version of > stlink to support "semi hosting" - using the Host PC for stdio functions > like printf/fread/fwrite. I have been looking at the README. The thing I did notice is that it is st-link that is used to do this "semi-hosting" stuff, not gdb. But I get the idea. You use shared-memory to communicate between the host and remote-device, using the debugging-hardware to access the memory on the device. Avarice does not have this option that stlink does, but perhaps I can do this using gdb and "expect" based scripting. > I understand there are also some other tools for the STM32F4 that > support semi hosting with IDEs. > > IIRC in gdb it's "r" for run/reset that does a hard restart of the > program. Most of the time I just use that and "load". I rarely set > breakpoints as its a bit painful. Probably use printf more. In my case, "r" give "run not supported on device". :-) Perhaps I need to force a "jump to a certain address" to emulate a reset. > Anyway all of my debugging is done on x86 versions of the same code. So > it's usually just a cross compile, then any device-specific issues which > I narrow down with unittests. I just want to do the same thing: test if the signal-detection algorithm works correctly or not. 73 kristoff - ON1ARF ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
