Zach, that would be very good of you; I got if from searching on the net
and it is barely changed (if at all) from what I found (but I didn't record
who I copied it from so I apologize for not giving credit). The *.dts is
below. I might mention that if I load my overlay only, then using >cat
$PINS, I can see the expected pin change to 6. If I setup the AD first in
python, I do not see any changes in the $PINS, and if I then try to load my
overlay and check the pins, they are still the same as just after boot.
Bit Pusher
/lib/firmware\> cat BB-BONE-PRU-00A0.dts
/*
* pru dts file BB-BONE-PRU-00A0.dts
*/
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-BONE-PRU";
version = "00A0";
exclusive-use =
"P8.12";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
mygpio: pinmux_mygpio{
pinctrl-single,pins = <
0x30 0x06
>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
test_helper: helper {
compatible = "bone-pinmux-helper";
pinctrl-names = "default";
pinctrl-0 = <&mygpio>;
status = "okay";
};
};
};
fragment@2{
target = <&pruss>;
__overlay__ {
status = "okay";
};
};
};
On Wednesday, December 4, 2013 8:17:47 AM UTC-5, Zachary Thorson wrote:
>
> 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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