Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi all! john3909: Sir! Your post in this topic halped me a lot and pointed me into right direction, but I still cannot figure out how to properly load my own version of this BB-ADC-00A0 overlay. Should I put

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi all! john3909: Sir! Your post in this topic halped me a lot and pointed me into right direction, but I still cannot figure out how to properly load my own version of this BB-ADC-00A0 overlay . Should I

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

BTW, you can run iiod on your BBB and then use IIO Oscilloscope on you desktop which can connect to your BBB and display the waveforms. https://wiki.analog.com/resources/tools-software/linux-software/iio_oscilloscope

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

If you are using the latest kernel, you must use u-boot overlays as the kernel capemanager as discussed in that article is no longer available. Regards, John > On May 18, 2018, at 4:57 PM, pierrick.ra...@gadz.org wrote: > > > John, > I am still working on this project. I have studied the

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Yes, sorry, my mistake I was looking to section 12.3.3 in the TRM instead on looking to the STEPCONFIG register description sections. Le mardi 17 avril 2018 00:19:16 UTC-4, john3909 a écrit : > > > > On Apr 16, 2018, at 3:40 PM, pierric...@gadz.org wrote: > > Hi John, > Thanks a lot for this

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

> On Apr 16, 2018, at 3:40 PM, pierrick.ra...@gadz.org wrote: > > Hi John, > Thanks a lot for this very complete answer ! I think I understand it now, the > last point I am not sure about is: > > ti,chan-step-avg = <1 1 1 1 1 1 1 1> /* 2 sample average */ > > I went through 12.3.3 of the

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi John, Thanks a lot for this very complete answer ! I think I understand it now, the last point I am not sure about is: ti,chan-step-avg = <1 1 1 1 1 1 1 1> /* 2 sample average */ I went through 12.3.3 of the AM3358 Technical Reference Manual and it seems that the setting the averaging

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Thanks John! > Looking at this a little more, there is a mistake in the ADC DT file > BB-ADC-0A00.dts. The maximum averaging is 16, not 0x16. > > The line > ti,chan-step-avg = <0x16 0x16 0x16 0x16 0x16 0x16 0x16 0x16> > > should be changed to > ti,chan-step-avg = <16 16 16 16 16 16 16 16> >

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

> On Apr 11, 2018, at 6:04 AM, pierrick.ra...@gadz.org wrote: > > Hi John, > Thanks for the help, I looked into the iio_generic_buffer.c example and i > patched it to disable the hardware triggers thanks to the patch presented on > this page :

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

> On Apr 11, 2018, at 6:04 AM, pierrick.ra...@gadz.org wrote: > > Hi John, > Thanks for the help, I looked into the iio_generic_buffer.c example and i > patched it to disable the hardware triggers thanks to the patch presented on > this page :

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi John, Thanks for the help, I looked into the iio_generic_buffer.c example and i patched it to disable the hardware triggers thanks to the patch presented on this page : https://www.teachmemicro.com/beaglebone-black-adc/ I am now able to reader a buffer from the different channel. However I

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Look at the kernel source under tools/iio for examples on how to use IIO. Regards, John > On Mar 27, 2018, at 12:10 PM, pierrick.ra...@gadz.org wrote: > > Hi John, > > Sorry for the late answer, I had hard time using the PRUs and I am now going > to use the IIO ADC driver, I am able to

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi John, Sorry for the late answer, I had hard time using the PRUs and I am now going to use the IIO ADC driver, I am able to read the sample with the cat command in /sys/bus/iio/devices/iio:device0/in_voltage3_raw However I am not able to use Libiio in order to read data from a user space

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

The IIO ADC driver can run at 800K samples per second. Here is the patch that made that possible. https://patchwork.kernel.org/patch/9391487/ I can confirm that I have tested the driver at 800Ksps and it works fine as long as you have a proper low impedance source for each ADC channel. CPU

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Thanks John, I am now working with the starterware_PRU but I did not find examples for using the McSPI with the PRU, do you think it will be hard to adapt the initial code to the PRU ? Thanks Pierrick Le lundi 19 février 2018 23:15:50 UTC-5, john3909 a écrit : > > Like I said, it was

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Thanks John, I am now working with the starterware_PRU but i did not find examples for using the McSPI with the PRU, do you think it will be hard to adapt the initial code to the PRU ? By the way, looking to the IIO driver documentation, it seems that for the AM335x chip the max sampling

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Like I said, it was based on Starterware, so search Github for starterware and you will see a project starterware_PRU. It does use the mcspi, so it is not a bitbang implementation. Regards, John > On Feb 19, 2018, at 7:33 PM, pierrick.ra...@gadz.org wrote: > > Thanks John for you answer,

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Thanks John for you answer, I was quit busy last week so I worked on this during the Weekend. Unfortunately, I was not able to find a project that is using the SPI and I2C interface with the PRU, I only found this one :

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

> On Feb 13, 2018, at 1:55 PM, pierrick.ra...@gadz.org wrote: > > Thank you for your quick answerJohn! > > So if I understand well, I can use the PRUs with the on-board SPI and I2C > interface ? I have not found any similar project that can help me on this. > Is it done using the L2 and L3

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Thank you for your quick answerJohn! So if I understand well, I can use the PRUs with the on-board SPI and I2C interface ? I have not found any similar project that can help me on this. Is it done using the L2 and L3 interconnect ? I am highly interested by using those on board interface

Re: [beagleboard] PRUs realtime data acquisition, I2C bus and ADC

> On Feb 13, 2018, at 9:49 AM, pierrick.ra...@gadz.org wrote: > > Hi all, > > I am trying to use the PRUs for real time data acquisition on the Beaglebone > black (Linux debian 4.9.45-ti-r57). I have set up the PRU with remoteproc and > RPMsg; everything is working fine. > The first time,

[beagleboard] PRUs realtime data acquisition, I2C bus and ADC

Hi all, I am trying to use the PRUs for real time data acquisition on the Beaglebone black (Linux debian 4.9.45-ti-r57). I have set up the PRU with remoteproc and RPMsg; everything is working fine. The first time, I successfully captured data with the PRU using the SPI protocol and bit