I'm looking to write a simple app for BBB. When started from the command line, it would set up the ADC in continuous mode and read ~1 M samples from e.g. AN0 into memory. After the capture is complete, it would write the data to a file and exit.
Ideally, it would run at the hardware limit of 1.6 MSPS (15 cycles of 24 MHz adc_clk per sample). If that's not practical, 800 KSPS or better would be acceptable. What is an easy way to do this? Most Beaglebone ADC examples sample at kilohertz rates or slower. This guide: http://processors.wiki.ti.com/index.php/Linux_Core_ADC_User%27s_Guide speaks of 200 KSPS. What is the limitation here? I've seen various suggestions to use the PRU, but don't understand why. I would think that since DMA would be required anyway, there should be no requirement to otherwise access the hardware with tight timing. If PRU is indeed necessary, is there a suitable example or tutorial? (None of the libpruio built-in examples deal with rapid sampling or large amounts of data.) Any other ideas for a simple way to capture data fast will be gratefully appreciated. 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/c5cae6bf-c8e0-45c4-ab5b-6bc236766d09%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
