[beagleboard] Re: spi / shiftout.js in 2017-03-19 image

On Tuesday, July 11, 2017 at 6:56:07 PM UTC-7, Jeff Albrecht wrote: > > On Friday, July 7, 2017 at 1:53:10 PM UTC-7, Jeff Albrecht wrote: > > [...] >> Are there any other changes that I may have missed? Suggestions? >> > > Regarding the SPI test in Exploring BeagleBone Black. Got it, works on my

Re: [beagleboard] Re: spi / shiftout.js in 2017-03-19 image

On Tuesday, July 11, 2017 at 8:25:54 PM UTC-7, William Hermans wrote: Additionally, this could very well be a Nodejs bottleneck. I've personally > experienced first hand how slow Nodejs really is when working with fast > moving code. I notice the title "shiftout.js" but you're also talking

Re: [beagleboard] Re: spi / shiftout.js in 2017-03-19 image

On Tue, Jul 11, 2017 at 8:17 PM, William Hermans wrote: > SPI is notoriously finicky when it comes to high speed, and noise. Since > I'm not an EE, I could not say much more than that. Typically though, from > what I understand, traces can not be very long. > Additionally,

Re: [beagleboard] Re: spi / shiftout.js in 2017-03-19 image

SPI is notoriously finicky when it comes to high speed, and noise. Since I'm not an EE, I could not say much more than that. Typically though, from what I understand, traces can not be very long. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you

[beagleboard] Re: spi / shiftout.js in 2017-03-19 image

On Friday, July 7, 2017 at 1:53:10 PM UTC-7, Jeff Albrecht wrote: [...] > Are there any other changes that I may have missed? Suggestions? > Regarding the SPI test in Exploring BeagleBone Black. Got it, works on my machine now! Thank you William and Gaurav for your input. It turned out that

[beagleboard] Re: spi / shiftout.js in 2017-03-19 image

Also note that Derek Molly's code does not set all parameters in the structure spi_ioc_transfer.. Bad/undefined values can cause SPI to die. Ensure you set all fields to have valid values. struct spi_ioc_transfer {