John: It works fine on my beaglebone, thanks. Also I can see that there is an small offset (~10mV) in different ADC input, but it doesn't matter because I can handle it by using a voltage divider.
john3909於 2014年6月11日星期三UTC+8下午1時42分35秒寫道： > > > From: <[email protected] <javascript:>> > Reply-To: <[email protected] <javascript:>> > Date: Tuesday, June 10, 2014 at 10:32 PM > To: <[email protected] <javascript:>> > Subject: Re: [beagleboard] beaglebone ADC AIN0 AIN2 AIN3 cannot be used? > > Hi, John. > Could you teach me how to disable touchscreen driver？ > should I delete the "cape-bone-lcd3-00A0.dtbo" under /lib/firmware ? > or should I modify "am335x-bone.dtb" under /boot ？ > > You need to disable the touchscreen in the kernel .config. Easiest way is > to do the following: > > In the Kernel folder: > make xconfig > > Under Device Drivers/Staging drivers > > Unselect "TI Touchscreen Interface” > > Save and rebuild kernel > > Alternatively, edit the .config file: > > Search for CONFIG_TOUCHSCREEN_TI_AM335X_TSC=y > > Change to > > # CONFIG_TOUCHSCREEN_TI_AM335X_TSC is not set > > Save and rebuild kernel. > > http://eewiki.net/display/linuxonarm/BeagleBone+Black > > Regards, > John > > > >> From: <[email protected]> >> Reply-To: <[email protected]> >> Date: Tuesday, June 10, 2014 at 2:10 AM >> To: <[email protected]> >> Subject: [beagleboard] beaglebone ADC AIN0 AIN2 AIN3 cannot be used? >> >> >> I used beaglebone white to implement ADC. >> However, when I use a signal generator and oscilloscope to see the input >> wave, >> There is always 1.8V in AIN0 , and always 0V in AIN2 and AIN3, but it is >> correct when I use AIN1 4 5 6, >> Could anyone help me？ >> >> Disable the touchscreen driver. >> >> Regards, >> John >> >> >> >> does that adc internal resistance cause it？ Or how should I modify >> ADC-related files to get correct signal？ >> >> -- >> 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 [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> >> -- > 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 [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
