What is your planned sample frequency? On Tue, Sep 22, 2015 at 4:50 PM, Antônio Albuquerque <[email protected]> wrote: > 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 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.
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