On 06.11.16 20:21, Gene Heskett wrote: > So, one question, will the udoo service the 7i90HD over an SPI > connection? If it will, I might blow another $150 trying it.
Looking at the udoo "datasheet.pdf" (more glossy shortform chart than real datasheet), under "Other Interfaces", there's LPC, 2 I²C, 20 GPIO, Touch Screen Management Signals on expansion connector." I'm confident that I²C is the same thing as TWI, but SPI is a simpler protocol with more wires: http://www.byteparadigm.com/applications/introduction-to-i2c-and-spi-protocols/ That's why I'd lean toward using some of the 20 GPIOs as a parport, though that would necessitate coding a device driver. It'd be faster than SPI. Bit-banged, it'd be better suited to output than input, but that's what's needed, AIUI. It'd be too big an exercise to move the TP & HAL to the spare on-board ARM chip, on the other side of a USB link, especially as Machinekit is hewing that type of path through the jungle already, but it would put the whole split system on one board. (Very compact) As you've indicated, the modest USB latency would be inconsequential in that case. Mind you, it's not even necessary to move the TP to the RT CPU if: a) It works ahead and sends moves to a queue on the other side of the USB link. b) Each move includes any delay information required to reconstitute timing after the queue. (I.e. TP separate from Trajectory scheduling) RT is still RT, even if everything is time-shifted. > > About the cable. Just don't worry about oil. oil does not conduct. > > I know that, but I have had hand lotion destroy microphone cables. > Litterally dissolveing the usual grey vinyl jacket in 6 months of news > talent putting on the news at WDTV. Dunno if they sell Aeroguard in the land of Trumpetman, but mere vapours of that mossie repellent ate the soft jacket off my car USB charger cable in less than one month. (Not hard to understand why it keeps the mossies off.) Good luck with offloading the X workload. That seems to be the recipe for getting an RPi up to the surface of the quagmire so you can see it moving. (Though since it even boots slowly, that's not a perfect fix.) Erik ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
