How to redefine pins on a Banana Pi M3 ?


GeorgeFlorian
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Armbianmonitor:

Hello !

 

I have a Banana Pi M3 that has 0 output on every pin. I measured 0 output using an oscilloscope.

 

I have been on all of the forums I can think of and I got no answer. How can I make the pins of this damned board work like the ones from a Raspberry Pi ? How does one define a pin ?

What does defining a pin means ? Because the pins look dead to me. How do I make them start ? How do I make them to output something... anything ?

I am a total and complete noob and I have no idea of the kernel voodoo that has to be done.

 

I am using ARMBIAN 5.83 stable Debian GNU/Linux 9 (stretch) 4.19.38-sunxi

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3 hours ago, GeorgeFlorian said:

I have a Banana Pi M3 that has 0 output on every pin. I measured 0 output using an oscilloscope.

Are you sure ? :P

Even with a scope, floating pins will not show any voltage ...

Did you try using "gpiofs" ? Example for flashing GPIO147 (PE19 on pin 40) :

#!/bin/bash

echo 147 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio147/direction

while true; do
	echo 0 > /sys/class/gpio/gpio147/value
	sleep 0.25
	echo 1 > /sys/class/gpio/gpio147/value
	sleep 0.25
done

 

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I can't use echo 101 > /sys/class/gpio/export

I have a rather strange error. I am the root and I can't do a thing to export.

 

root@bananapim3:/sys/class/gpio# ls -l
total 0
--w------- 1 root root 4096 Jan  1  1970 export
lrwxrwxrwx 1 root root    0 Jan  1  1970 gpiochip0 -> ../../devices/platform/soc/1c20800.pinctrl/gpio/gpiochip0
lrwxrwxrwx 1 root root    0 Jan  1  1970 gpiochip352 -> ../../devices/platform/soc/1f02c00.pinctrl/gpio/gpiochip352
lrwxrwxrwx 1 root root    0 Jun 25 09:35 gpiochip414 -> ../../devices/platform/soc/1f03400.rsb/sunxi-rsb-3a3/axp20x-gpio/gpio/gpiochip414
--w------- 1 root root 4096 Jan  1  1970 unexport

root@bananapim3:/sys/class/gpio# echo 101 > /sys/class/gpio/export
bash: echo: write error: Invalid argument 

Also, which one is GPIO 101 ? I can't figure it out.

I presume this is the formula for the pin number: 

(position of letter in alphabet - 1) * 32 + pin number 

Looking through the pin-out of the Banana Pi M3 I have some weird named pins like:

PL10-S-EINT10

PC4 PC4

 

I hope that PL10-S-EINT10 is actually PL10, and by using the formula I have (12 - 1)*32 + 10 = 362 and that PC4 PC4 is a typo and it should've been PC4 which, using the formula, should be: (3-1)*32+4 = 64

 

EDIT:

I've tried that script with PL10-S-EINT10 which is Pin 7 and I got a signal on the oscilloscope.

Also, I can't find PE17 on the Banana Pi3.

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I am back to square one. I fired up the project, after I've made the script with all the pins that I needed and my project still doesn't work.

I have put the following lines of code inside /etc/rc.local so that it fires up on every boot:

```

echo 362 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio362/direction

echo 68 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio68/direction

echo 35 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio35/direction

echo 71 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio71/direction

echo 81 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio81/direction

echo 34 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio34/direction

echo 360 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio360/direction

echo 64 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio64/direction

echo 65 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio65/direction

echo 361 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio361/direction

echo 66 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio66/direction

echo 67 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio67/direction

echo 234 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio234/direction

```

 

I am trying to drive some RGB LED Panels using this library: https://github.com/hzeller/rpi-rgb-led-matrix

 

 

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