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Pine64: Pin 72/PC8 not working


Thomas131

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Hello!

I installed a fresh Armbian (5.31; Server) on my Pine64 yesterday. Today I wanted to start playing around with GPIO ... And it seems like Pin 72 isn't working ... Doing the same on Pin 77, everything works fine ... For the secound test, I used https://github.com/databit/Pine64-CPP. I only added some Debug info to example.cpp.

Spoiler

Script started on Fri 28 Jul 2017 01:35:44 PM CEST
root@pine64:/sys/class/gpio# echo "72" > export
bash: echo: write error: Device or resource busy
root@pine64:/sys/class/gpio# echo "72" > unexport
bash: echo: write error: Invalid argument
root@pine64:/sys/class/gpio# ls
export  gpiochip0  gpiochip1024  gpiochip352  unexport
root@pine64:/sys/class/gpio# cd /opt/Pine64-CPP/
[Removed some lines where I was inserting debug info into example.cpp]
root@pine64:/opt/Pine64-CPP# make
g++ -fpermissive -Wall -o test *cpp
sudo ./test
 Set GPIO pin directions
Turn Led ON     PinMode:1    Value:1
Turn Led OFF    PinMode:0    Value:0
Turn Led ON     PinMode:0    Value:0
Turn Led OFF    PinMode:0    Value:0
Turn Led ON     PinMode:0    Value:0
Turn Led OFF    PinMode:0    Value:0
^CMakefile:2: recipe for target 'default' failed
make: *** [default] Interrupt

root@pine64:/opt/Pine64-CPP# make
g++ -fpermissive -Wall -o test *cpp
sudo ./test
 Set GPIO pin directions
Turn Led ON     PinMode:1    Value:1
Turn Led OFF    PinMode:1    Value:0
Turn Led ON     PinMode:1    Value:1
Turn Led OFF    PinMode:0    Value:1
Turn Led ON     PinMode:0    Value:1
Turn Led OFF    PinMode:0    Value:1
Turn Led ON     PinMode:0    Value:1
^CMakefile:2: recipe for target 'default' failed
make: *** [default] Interrupt

root@pine64:/opt/Pine64-CPP# cat example.cpp
/*
                              PINE 64 - C++ lib                                            1                        
 Copyright (c) 2017 Daniele Contarino <daniele.contatino@studium.unict.it>               i111i                      
 This library is based over work by:                                                  .ft  .;  .tf.                  
     Eric Ptak <trouch@trouch.com>                                                    ft. ,fft. .ff                  
     Stefan Mavrodiev @ OLIMEX LTD <support@olimex.com>                               1fffffffffff1                  
     Kamil Trzcinski <ayufan@ayufan.eu>                                           ,LLf. ,fffffff, ,LLL,              
Permission is hereby granted, free of charge, to any person obtaining a copy of   ,LLLLLLLi   iLLLLLLL,              
this software and associated documentation files (the "Software"), to deal in     ,LLL;  1LLLLLi  ;LLL,              
the Software without restriction, including without limitation the rights to        :LLLLLLLLLLLLLLL:                
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies    .LLL;  1LLLLLLLi  ;LLL              
of the Software, and to permit persons to whom the Software is furnished to do    :LLLLLLL:   :LLLLLLL,              
so, subject to the following conditions:                                           iLLf. :LLLLL, .LLL;               
The above copyright notice and this permission notice shall be included in all       1LLLLLLLLLLLLLi                 
copies or substantial portions of the Software.                                          :LLLLL:                     
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR                  L                        
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,                    L      
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/resource.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <iostream>
#include <sstream>

#include "pinout.h"
#include "gpio.h"
#include "i2c.h"
#include "spi.h"

using namespace std;
using namespace Pine64;

int main (void) {
    GPIO* man = new GPIO();

    if (man->setup()) {
        cout << "Failed to configure GPIO\n" << endl;
        return 1;
    }
    
    cout << " Set GPIO pin directions" << endl;
    man->pinMode(72, OUTPUT, PUD_OFF);

    while(1) {
            cout << "Turn Led ON ";
            man->digitalWrite(72, HIGH);
        cout << "\tPinMode:" << man->GPIOFunction(72);
        cout << "\tValue:" << man->digitalRead(72) << endl;
            man->delay(1000);
            
        cout << "Turn Led OFF";
            man->digitalWrite(72, LOW);
        cout << "\tPinMode:" << man->GPIOFunction(72);
        cout << "\tValue:" << man->digitalRead(72) << endl;
            man->delay(1000);
    }

    cout << "Exiting....." << endl;
    return 0;
}
root@pine64:/opt/Pine64-CPP# exit

Script done on Fri 28 Jul 2017 01:43:42 PM CEST

When I looked at the Schematics of the Pine64 (http://files.pine64.org/doc/Pine A64 Schematic/Pine A64plus 2GB Rev C-20160113_Release.pdf), I noticed that according to Page 7, the Pine has eMMC on it and the whole Port C is connected to it ... I haven't found that somewhere else and couldn't find an eMMC-Chip on my Pine, too.

Do you have an idea, why it doesn't work? A reboot didn't help, too ...

Thanks in advance!

Thomas

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GPIO72 is PC8, and on my side, I don't have any error trying to export it. So, on your side, something is using it and that is why you have "resource busy".

Try to run the following command to see who is using it :

cat /sys/kernel/debug/gpio

Also, please mentioned which kernel/image are you using...

 

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Thanks, this really helped!:

me@pine64:~$ uname -a
Linux pine64 3.10.105-pine64 #2 SMP PREEMPT Fri Jun 23 21:12:42 CEST 2017 aarch64 aarch64 aarch64 GNU/Linux
me@pine64:~$ sudo cat /sys/kernel/debug/gpio
[sudo] password for meroot:  
GPIOs 0-255, platform/1c20800.pinctrl, 1c20800.pinctrl:
 gpio-0   (?                   ) in  lo
 gpio-72  (w1                  ) in  lo
 gpio-166 (1c0f000.sdmmc cd    ) in  lo
 gpio-231 (SPK                 ) out lo
 
GPIOs 352-383, platform/1f02c00.pinctrl, 1f02c00.pinctrl:
 gpio-354 (wlan_regon          ) out hi
 gpio-355 (wlan_hostwake       ) in  lo
 gpio-356 (bt_rst              ) out lo
 gpio-359 (system_status       ) out hi
 
GPIOs 1024-1027, platform/pinctrl.2, axp-pinctrl:
me@pine64:~$ exit

 

After a search on the internet, I found out, that this is the 1-wire kernel module. I unloaded it with sudo modprobe -r w1-gpio. Now it works! To permanently prevent the module from loading, I added it to /etc/modprobe.d/blacklist.conf.

 

Thanks! Your answer helped a lot!!!!

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