Thanks John, appreciated.
Bit Pusher
On Tuesday, December 3, 2013 11:45:23 PM UTC-5, John Syne wrote:
>
>
>
> From: Bit Pusher <ken.w....@gmail.com <javascript:>>
> Reply-To: <beagl...@googlegroups.com <javascript:>>
> Date: Tuesday, December 3, 2013 at 6:39 PM
> To: <beagl...@googlegroups.com <javascript:>>
> Subject: [beagleboard] Re: Deleting Device Tree Overlays
>
> If I load my device tree overlay to use the high-speed GPIO pins first,
> and then try to read the ADC using Adafruit_BBIO, it kicks me out of python:
>
> ~/pru\> sudo python
> Python 2.7.5+ (default, Sep 19 2013, 14:17:30)
> [GCC 4.8.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import Adafruit_BBIO.ADC as ADC
> >>> ADC.setup()
> >>> ADC.read("P9_40")
> ~/pru\>
>
> notice no value returned and no python prompt. I suspect this indicates a
> problem.
> I then rebooted (reset switch), waited until the network started working
> again (it takes 5 minutes each time for the network to work, something
> needs to timeout)
> and then did the same, but this time did not load the device overlay to
> change one pru gpio to a high-speed output and got as expected
>
> ~/pru\> sudo python
> Python 2.7.5+ (default, Sep 19 2013, 14:17:30)
> [GCC 4.8.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import Adafruit_BBIO.ADC as ADC
> >>> ADC.setup()
> >>> ADC.read("P9_40")
> 0.8072222471237183
> >>>
>
> I should mention that when I load both overlays, with my overlay first,
> >cat $SLOTS shows them both there, just the ADC overlay load does not
> work correctly. If I run the ADC.setup() first, and then run
> ~/pru\>>sudo sh -c "echo BB-BONE-PRU > $SLOTS" to load my overlay, then
>
> /lib/firmware\> cat $SLOTS
> 0: 54:PF---
> 1: 55:PF---
> 2: 56:PF---
> 3: 57:PF---
> 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
> 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
> 7: ff:P-O-L Override Board Name,00A0,Override Manuf,cape-bone-iio
> 9: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-PRU
> /lib/firmware\>
>
> and both overlays are shown but the high
> speed pin does not work.
> Loading just my overlay only, works as expected as far as I can tell (i.e.
> the led turns on and off).
> I'm guessing things are not quite as expected.
> Also, could someone point me to the file in kernel source that loads
> overlays?
>
>
> GIT is your friend and you can use it to find what you want in the kernel.
> Simply use “git grep capemgr” and it will show you all the files that
> reference the cape manager, which is what loads and removes overlays. You
> will notice that there are several patches that attempt to fix crashes
> related to capemgr.
> Regards,
> John
>
> Thanks.
> Bit Pusher
>
>
> On Tuesday, December 3, 2013 12:16:34 PM UTC-5, Zachary Thorson wrote:
>>
>> Correct me if I am wrong, but it appears that you simply want to use ADC
>> and PRU pins whose pins DO NOT physically overlap on the board? The
>> cape-bone-iio device tree only grabs the ADC0-ADC7 pins plus analog power
>> and ground, so it should not interfere with the PRU pins.
>>
>> What issue are you getting when you try to load the PRU overlay after
>> loading the ADC overlay?
>>
>> Note: The adafruit library has a cleanup function in code, but it is
>> commented out due to the lockup on load that you are describing.
>>
>> Zach
>>
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