Hi cowboy!
I confirm, GPIO high is 3.3V. Unconnected pins (input pins without
resistor) have about 0.8V.
Why don't you use the PWM devices for that task?
Anyway, P8_11 isn't connected to the PRUSS. This pin only works in GPIO
mode (mode 7) and I'm not sure if you can reach 50MHz that way.
The faster way is to use a PRU register pin and for that you have to choose
another pin (ie. P8_15 = GPIO-1/15 = PRU-0:r30.t15).
And why are you doing the pinmuxing by the device tree overlay? Instead do
it from your PRUSS code! Compile a minimal device tree overlay like
/*
* 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 =
"P8.15";
fragment@0{
target = <&pruss>;
__overlay__ {
status = "okay";
};
};
};
Then add to your PRUSS code (OCP master port must be enabled)
MOV r1, 0x44E10800 // CM pinmux address
LDI r2, 0b1110 // mode 6, no resistor
SBBO r2, r1, 0x3C, 1 // set pinmuxing @ball 15 (= GPIO-1/15)
That's all. You'll have all your code in single source and you're much
faster in doing any testing.
Good luck!
--
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.
