-------------------------------------------- On Fri, 1/27/17, John Syne <[email protected]> wrote:
Subject: Re: [beagleboard] Phasors calculation using libpruio To: [email protected] Date: Friday, January 27, 2017, 8:53 PM Is there a reason you don’t do this on the ARM processor? In the v4.8 kernel, the ADC uses DMA, so you can sample at full speed. Regards,John On Jan 26, 2017, at 8:10 PM, Renzo Fabián <[email protected]> wrote: I have the following C code's parts that uses tables of sins and cosins to calculate a fundamental phasor of 60 Hz electrical system using 16 samples per cycle (960 Sps): float cosins[]={1, 0.92388, 0.70711, 0.38268, 0, -0.38268, -0.70711, -0.92388, -1, -0.92388, -0.70711, -0.38268, 0, 0.38268, 0.70711, 0.92388}; float sins[]={0, 0.38268, 0.70711, 0.92388, 1, 0.92388, 0.70711, 0.38268, 0, -0.38268, -0.70711, -0.92388, -1, -0.92388, -0.70711, -0.38268}; ... for(i=0; i <16; i++){ ret_r=x[15-i]*cosins[i]+ret_r; ret_i=x[15-i]*sins[i]+ret_i; } return 0.088388*ret_r -0.088388*ret_i*I; Is it possible to perform this using the libpruio in order to read 6 analog inputs? If yes? What is the best way to implement it if other operations were need, i.e. compute the division of 2 phasors. Thanks. -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/a0e5a09a-0468-404d-9bf2-3436a62065ea%40googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/9C4AA6F4-0612-4ECD-8275-0F93EDE99744%40gmail.com. For more options, visit https://groups.google.com/d/optout. asarabia fusese incorporata de Rusia tarista la capatul razboiului ruso-oto- -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/973597746.2150553.1485543611718%40mail.yahoo.com. For more options, visit https://groups.google.com/d/optout.
