Hey TJF, So, if I'm understandig it right, what I conclude is that with only one ADC working, the maximum sample rate we can get is around 93 kHz. Above when you answered to *jleb, *you said:
"The result is as expected, and even if I increase the frequencies, all looks good up to a sampling rate of 200 kHz." How can I get that sample rate? 200kHz is the maximum according to the features of processor AM3359. ( http://www.ti.com/product/AM3359/datasheet/abstract#SPRS7176831). Thank you for your attention. BR, Luciano. Quarta-feira, 17 de Dezembro de 2014 19:03:03 UTC, TJF escreveu: > > @Luciano > > I changed your loop logic a bit, so that the GPIO output only changes > after the ADC value is present > > IF .Adc->setStep(1, 0, 0, 0, 0) THEN _ ' configure fast Adc step > ?"ADC setStep failed (" & *.Errr & ")" : EXIT DO > > IF .config(1, 1 SHL 1) THEN _ > ?"config failed (" & *.Errr & ")" : EXIT DO > > ... > > FOR i AS INTEGER = 0 TO c > WHILE .Adc->Value[1] <= &h7FFF : WEND ' wait until high > IF .Gpio->setValue(POUT, 0) THEN _ ' set GPIO low > ?"GPIO setValue failed (" & *.Errr & ")" : EXIT DO > WHILE .Adc->Value[1] > &h7FFF : WEND ' wait until low > IF .Gpio->setValue(POUT, 1) THEN _ ' set GPIO high > ?"GPIO setValue failed (" & *.Errr & ")" : EXIT DO > NEXT > if .Cap->Value(PIN, @f2, @d2) then _ ' get CAP input > ?"Cap->Value failed (" & *.Errr & ")" : EXIT DO, > DO > ... > > and I get higher frequencies > > ADC closed loop: > Minimum: 69589.421875 > Avarage: 91196.43975694444 > Maximum: 93196.6484375 > > > Quarta-feira, 17 de Dezembro de 2014 19:03:03 UTC, TJF escreveu: > > @Luciano > > I changed your loop logic a bit, so that the GPIO output only changes > after the ADC value is present > > IF .Adc->setStep(1, 0, 0, 0, 0) THEN _ ' configure fast Adc step > ?"ADC setStep failed (" & *.Errr & ")" : EXIT DO > > IF .config(1, 1 SHL 1) THEN _ > ?"config failed (" & *.Errr & ")" : EXIT DO > > ... > > FOR i AS INTEGER = 0 TO c > WHILE .Adc->Value[1] <= &h7FFF : WEND ' wait until high > IF .Gpio->setValue(POUT, 0) THEN _ ' set GPIO low > ?"GPIO setValue failed (" & *.Errr & ")" : EXIT DO > WHILE .Adc->Value[1] > &h7FFF : WEND ' wait until low > IF .Gpio->setValue(POUT, 1) THEN _ ' set GPIO high > ?"GPIO setValue failed (" & *.Errr & ")" : EXIT DO > NEXT > if .Cap->Value(PIN, @f2, @d2) then _ ' get CAP input > ?"Cap->Value failed (" & *.Errr & ")" : EXIT DO, > DO > ... > > and I get higher frequencies > > ADC closed loop: > Minimum: 69589.421875 > Avarage: 91196.43975694444 > Maximum: 93196.6484375 > > > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
