I did a Beagle Bone PRU project in 2014, based on the Machinekit build, but
otherwise not related to Machinekit. Now, I've got another similar project.
I am working with the April 14 2019 Machinekit download.
I need 11 PRU direct outputs and 2 direct inputs. I created a .dts file
for the earlier project that is pretty close :
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
part-number = "BB-BONE-PRU";
version = "00A0";
exclusive-use =
"P8.45",
"P8.46",
"P8.43",
"P8.44",
"P8.41",
"P8.42",
"P8.39",
"P8.40",
"P8.27",
"P8.29",
"P8.28",
"P8.30",
"P9.26",
"P8.20",
"P8.21";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
mygpio: pinmux_mygpio{
pinctrl-single,pins = <
0xa0 0x05 // P8.45 PRU1_out0
0xa4 0x05 // P8.46 PRU1_out1
0xa8 0x05 // P8.43 PRU1_out2
0xac 0x05 // P8.44 PRU1_out3
0xb0 0x05 // P8.41 PRU1_out4
0xb4 0x05 // P8.42 PRU1_out5
0xb8 0x05 // P8.39 PRU1_out6
0xbc 0x05 // P8.40 PRU1_out7
0xe0 0x05 // P8.27 PRU1_out8
0xe4 0x05 // P8.29 PRU1_out9
0xe8 0x05 // P8.28 PRU1_out10
0xec 0x05 // P8.30 PRU1_out11
0x180 0x36 // P9.26 PRU1_in16 mode 6, pull-up, RX active
0x84 0x36 // P8.20 PRU1_in13 mode 6, pull-up, RX active
0x80 0x36 // P8.21 PRU1_in12 mode 6, pull-up, RX active
>;
};
};
};
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";
};
};
};
------------ end of file ---------------------
Is this syntax still correct?
And, then, how do you install the devicetree overlay?
This is how I did it before :
modprobe uio_pruss
cp BB-BONE-PRU-00A0.dtbo /lib/firmware/
echo BB-BONE-PRU:00A0 > /sys/devices/bone_capemgr.9/slots
more /sys/devices/bone_capemgr.9/slots
_________end of file ________
But, this now gives an error,
./dtc_load: 5: ./dtc_load: cannot create /sys/devices/bone_capemgr.9/slots:
Directory nonexistent
Is there a document that explains how to do this?
Thanks much for any help!
Jon
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