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 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.
