Hello Julian Thank you for your fast reply. I am trying to use the same ADS8528 to read 48 channel of sensors using daisy-chain to get the information simultaneously. Definitely I appreciate if you can send me some code.
Best regards, Antonio 2015-09-22 10:48 GMT-03:00 Julian David Rath <[email protected]>: > Hej Antonio, > > I used the PRU to communicate with the BBB, which works quite good. > But datarates with more the 20 Mbit are not realistic since the PRUs > have a clock of 200 Mhz. > If you are interested I could prepare some code to release. > > bests, > > Julian > > > On Tue, Sep 22, 2015 at 2:52 AM, <[email protected]> wrote: > > Hello Julian, > > I am having the same issue, could you let me know about the solution? > Have > > you found some workaround to use BBB->SPI and ADS8528? > > Best regards > > Antonio > > > > > > Em segunda-feira, 10 de março de 2014 07:15:25 UTC-3, Julian David Rath > > escreveu: > >> > >> Hi, > >> > >> I just found out that this is a better place to ask my question, it > seams > >> like there is also a beaglebone Google group, little confusing. So here > my > >> cross-post: > >> > >> I'd like to connect 4 ADS8528[0] daisy-chained via SPI to a BBB. I want > to > >> test it in different iterations first I want to measure the 32 Analog > input > >> channels captured by the ADS8528s with 1kHz and at the end with 200kHz. > >> Those ADS8528 using 4 SPI Channels in daisy-chain mode. So I did some > >> calculations on the needed bandwidth: > >> > >> for 1Khz: > >> 12Bit * 32Channels * 4KHz = 384 Kbit/s > >> > >> On 4 SPI Channels that means: > >> 12* 32*1Khz = 96 Kbit/s per SPI channel > >> > >> for 200Khz: > >> 12Bit * 32Channels * 200KHz = 76.8 Mbit/s = 9.6MByte/s > >> > >> On 4 SPI Channels that means: > >> 76.8Mb/s /4 = 19.2 Mbit/s per SPI channel > >> > >> Now 2 things: > >> * Should/Can I use the built-in SPI of the BBB or do I have to > implement > >> 4 channels SPI bus by hand (High datarates PRUSS I guess)? > >> * Do you think the high datarates for the 200Khz are achievable? > >> > >> Thanks, > >> > >> /Julian > >> > >> [0]: http://www.ti.com/product/ads8528 > > > > -- > > For more options, visit http://beagleboard.org/discuss > > --- > > You received this message because you are subscribed to a topic in the > > Google Groups "BeagleBoard" group. > > To unsubscribe from this topic, visit > > https://groups.google.com/d/topic/beagleboard/SpRz6u9_8aA/unsubscribe. > > To unsubscribe from this group and all its topics, send an email to > > [email protected]. > > 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 a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/SpRz6u9_8aA/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Atenciosamente, Antônio Albuquerque -- 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.
