Could you post or send me your overlay? I can load it on one of my BBBs and
take a look for you.
Zach
On Tuesday, December 3, 2013 8:39:35 PM UTC-6, Bit Pusher wrote:
> 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?
> 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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