Unable to interact with the GPIO of Raspberry Pi 5

Created by: eMUQI

Description

Unable to interact with the GPIO of Raspberry Pi 5

Expected Behavior

Draw a dot on Processing, which blinks synchronously with the LED.

Current Behavior

/sys/class/gpio/export：Invalid argument
GPIO pin 17 does not seem to be available on your platform
RuntimeException: /sys/class/gpio/export: Invalid argument
RuntimeException: /sys/class/gpio/export: Invalid argument

Steps to Reproduce

1. Install Hardware I/O
   

2. Run the code

   import processing.io.*;
   int ledPin = 17;
   boolean state = true;
   
   void setup() {
       size(100, 100);
       frameRate(2); //set frame rate
       GPIO.pinMode(ledPin, GPIO.OUTPUT); //set the ledPin to output mode
   }
   
   void draw() {
       state = !state;
       if (state==true) {
           GPIO.digitalWrite(ledPin, GPIO.LOW); //led on
           fill(255, 0, 0); //set the fill color of led on
       } else {
           GPIO.digitalWrite(ledPin, GPIO.HIGH); //led off
           fill(155); //set the fill color of led off
       }
       ellipse(width/2, height/2, width*0.75, height*0.75);
   }
   

3. error

Your Environment

• Processing version:
  • 4.3
• Operating System and OS version:
  • OS: Debian GNU/Linux 12 (bookworm) aarch64
  • Kernel: 6.1.0-rpi6-rpi-2712
• Other information:
  • Raspberry Pi 5 Model B Rev 1.0
  • CPU: BCM2835 (4) @ 2.400GHz

Possible Causes / Solutions

My suspicion is that it might be related to the introduction of the new southbridge chip, RP1, on the Raspberry Pi 5, which now handles the GPIOs and may have altered the access protocol.

Other

Also report at https://discourse.processing.org/t/issue-with-gpio-access-on-raspberry-pi-5-using-processing-4/43337

Start with the Hardware I/O GPIO entry points used by GPIO.pinMode and GPIO.digitalWrite, and reproduce the sketch on Raspberry Pi 5 with Debian 12. Compare the /sys/class/gpio/export failure and unavailable pin 17 with the existing GPIO access path; done means the provided sketch can control the LED and draw the synchronized dot without the RuntimeException.