On 22-12-2013 22:54, Bas de Bruijn wrote: >> Ik kan kop noch staart ontdekken aan je resultaten, something's >> completely wrong! >> > nou ik ben het spoor ook behoorlijk bijster. Ik ben redelijk bekend met > industriele automatisering en electronica en het uizoeken/lezen van > datasheets, wat hacken hier en daar en vaak kom ik er wel uit. > >> Your description also puzzles me: Potmeter on J6 is clear. But "J7 >> and >> J8 jumpers"? Do >> you mean you've short circuit jumpers on the J7 and J8 inputs? > yes
Strange, because each jumper should generate a low ADC reading. > >> What's the value of the potmeter? > set at approx 1k (had to steal a 9V battery from my son his RC car > because Murphy made sure my multimeter battery was empty. The things we > do for our hobbies .... Sometime, Murphy will punish you for this act ;-) > [...] > linuxcnc@arm:~$ cat `find /sys/devices/ -name in_voltage[456]_raw` > 1331 > 4070 > 3585 These values are completely wrong. It looks like the numbering of the analog inputs is mixed up. J8 should corresponding to input 4, J7 to input 5 and J6 to input 6. You are getting the result of J8 on input 5. The fact that you are seeing the J8 signal on input 5 instead of on input 4 indicates you're using the BeBoPr pin assignments instead of the Bridged BeBoPr assignments. The other two inputs (J6 & J7) then go to adc inputs 1 and 3, you might be able to verify this by changing the 456 to 135 ! > > But I see something emerge... Here is my entire screendump of the > console (used putty for ssh-ing into the BBB because I need to copy and > paste all this info) > seems that every 8th time I do "cat `find /sys/devices/ -name > in_voltage[456]_raw`" i get this error message. And something happening > at the 8th time seems like something to do with bits and bytes to > me..... (don't ask me what, I'm just a mechanical engineer) Yeah, that's a known problem with the ADC driver, introduced with the 3.8 kernel. -- Bas > > > below the entire console contents: > [...] > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
