Hi, OK, I missed it when reading the pot's documentation, my bad. Could you tell me what is the code for the SPI(x,y) function/library you are using on the BeagleBone ? I used SPI between PRUs and an accelerometer once, and I encourtered a similar problem, which finally came form the SPI phases. However I never used it directly from the ARM. Thanks
Pierrick Le jeudi 8 février 2018 08:48:48 UTC-5, Kaarkuzhali Murugan a écrit : > > Hi, > > AD8403 has a SDO pin (Pin 13). > And my issue is in transferring the data to the pot. I meant to say, > whatever value I pass to the pot, resistance is not changing. But when I > use an arduino board, resistance is changing. > > > Regards, > Kaarkuzhali Murugan > > > On Thursday, 8 February 2018 02:39:31 UTC+5:30, pierric...@gadz.org wrote: >> >> I maybe of the track, but the AD 8403 seems to be a 3 wire SPI, then I do >> not understand why your setting up 4 pins on the BBB >> >> Thanks >> >> Pierrick >> >> Le mercredi 17 janvier 2018 10:27:43 UTC-5, Kaarkuzhali Murugan a écrit : >>> >>> >>> I am working with a beaglebone black and I want to transfer data to my >>> potentiometer (AD 8403). BBB is the master and pot is the slave. >>> >>> My beaglebone settings: >>> >>> 1) *uname -a * >>> Linux beaglebone 4.9.59-ti-r74 #1 SMP PREEMPT Thu Nov 2 06:20:31 UTC >>> 2017 armv7l GNU/Linux >>> >>> 2)* cat /etc/dogtag* >>> BeagleBoard.org Debian Image 2017-11-05 >>> >>> 3) *cat /etc/debian_version * >>> 9.2 >>> >>> 4) *cat /sys/devices/platform/bone_capemgr/slots* >>> cat: /sys/devices/platform/bone_capemgr/slots: No such file or directory >>> >>> 5) *ls -al /dev/spi** >>> crw-rw---- 1 root spi 153, 1 Nov 3 2016 /dev/spidev1.0 >>> crw-rw---- 1 root spi 153, 0 Nov 3 2016 /dev/spidev1.1 >>> crw-rw---- 1 root spi 153, 3 Nov 3 2016 /dev/spidev2.0 >>> crw-rw---- 1 root spi 153, 2 Nov 3 2016 /dev/spidev2.1 >>> >>> 6) Pins are configured through config pin >>> >>> config-pin P9_17 spi_cs >>> config-pin P9_18 spi >>> config-pin P9_21 spi >>> config-pin P9_22 spi_sclk >>> >>> 7) *cat /etc/default/capemgr* >>> # Default settings for capemgr. This file is sourced by /bin/sh from >>> # /etc/init.d/capemgr.sh >>> >>> # Options to pass to capemgr >>> CAPE=BB-SPIDEV0 >>> >>> >>> Loopback test is working fine but when I try to transfer any data to my >>> pot, I am receiving [255] as the result. How to solve this issue? >>> *Loopback test example:* >>> >>> spi = SPI(0, 0) >>> print spi.xfer2([0, 0]) >>> [0, 0] >>> spi.close() >>> >>> *When connected to pot:* >>> >>> spi = SPI(0, 0) >>> print spi.xfer2([0, 0]) >>> [255, 255] --> This is where the issue is. >>> spi.close() >>> >>> >>> >>> Thanks in advance. >>> >>> -Regards, >>> Kaarkuzhali Murugan. >>> >> -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/64cfbd55-40a8-4180-be0d-e9b8acf674ed%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
