On Tue, Jan 31, 2017 at 8:08 PM, William Hermans <[email protected]> wrote:
> No way in hell CANBUS is going to keep up with multi channel ADC samples > at faster sample rates. If one needs fast, or super fast sampling, the only > real option is going to be SPI. > Sorry, I meant to say ethernet here. Was thinking about interfacing and "exit strategy" at the same time ;) > > So using the on die ADC last year I did a bit of a test to see how much > data really would be written out to "disk" from reading from the ADC's for > a constant 200ksps over . . . You know I do not remember the time frame, > but it was for a total of 2M samples I think. 2M samples in text form came > to a total of about 9M in size on disk, and I seem to recall 2.5M-3M per > second. Averaged. CanBUS is 1Mbit/second max, which does not even come > close. Somewhere around 24x too slow. But the point is, if you need a > serious amount of ADC samples sent out remotely, the only real option > would be Ethernet. Which could be as simple as setting up an NFS mount on > the beaglebone. e.g. the storage is remote, but the beagleobne writes to > that storage as if it's local, and it's pretty fast. ~10M/s + > Additionally, and this relates to my comment above. Technically, the all out fastest possibility here would be USB. I did manage to achieve ~20M / second writes a few years ago. Using an externally powered IDE<->USB enclosure. I also have an enclosure here with a much better controller, just have not had the time to replace the disk for a good test. The controller is of the USB 3.0 variant, and should show just how much the USB 2.0 bus on the Beaglebone can handle. *shrug* -- 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/CALHSORr3eg4NV%2Brrp3RUqn%2B9d0uuUXca2ZN7sQj04Qk5kwE9GA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
