Hey, I'm trying to match the below modification in my version of libpruio, but while compiling I run into the following
ld: pruio.o: relocation R_ARM_THM_MOVW_ABS_NC against `a local symbol' can not be used when making a shared object; recompile with -fPIC and I'm not sure how to get past it. I -think- that I have the freebasic compiler running correctly. Any advice would be welcome. Thanks, Michael Todd On Thursday, November 6, 2014 10:36:04 AM UTC-8, TJF wrote: > > Hello Nils, > > thanks for the code. I think about including it in the libpruio examples > folder, but your main loop is endless and the user cannot abort the > program. (Shouldn't the file get closed?) Perhaps I can adapt it a bit. > > Regarding the ADC speed I made some further testing and it seems that I > mis-interpreted the TRM. The ADC subsystem can sample at least at 200 kS/s. > This speed also works for multiple channels. Find an example of four > channels at 44.1 kHz in this post > <http://beagleboard.org/Community/Forums?place=msg%2Fbeagleboard%2F3AFiCNtxGis%2FH7q76xdk8ZQJ>. > > An overall sampling rate of 200 kHz was also possible (four channels). > > So the limiting in the current libpruio-0.2 is too much on the safe site. > If you don't want to wait for the next version, you can adapt the code by > yourself (FreeBASIC compiler required). Replace in file pruio_adc.bas in > function PruIo.configure(...) the lines > > d *= (Conf->ADC_CLKDIV + 1) * 417 '417 ≈ 1000000 / 2400 (= 1 GHz / > 2.4 MHz) > d += 30 ' PRU cycles for restart [GHz] > IF Tmr <= d THEN .Errr = @"sample rate too big" : RETURN .Errr > > by the following code > > d = (d * (Conf->ADC_CLKDIV + 1) * 1000) \ 24 > IF Tmr <= d ORELSE Tmr < 5000 THEN _ > .Errr = @"sample rate too big" : RETURN .Errr > > You may play a bit with the absolute value 5000. On my BBB the timing is > OK up to a frequency of 240 kHz (4165). But this may vary from board to > board. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
