Comments (6)
fivdi
commented on August 24, 2024
2
The exact same test program works fine for me on a Pi 2:
pi@raspberrypi:~/onoff $ cat test.js
var Gpio = require('onoff').Gpio;
var led4 = new Gpio(4, 'out');
blink(led4, 500);
function blink(led, period) {
led.write(1, function () {
setTimeout(function(){
led.write(0);
}, period);
});
}
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ ls /sys/class/gpio/
export gpio4 gpiochip0 unexport
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ ls /sys/class/gpio/
export gpio4 gpiochip0 unexport
pi@raspberrypi:~/onoff $ node test.js
pi@raspberrypi:~/onoff $ As can be seen, the test program can be called multiple times without issue.
This indicates that GPIO4 on your system is being reserved by some other software and is therefore not available for usage in the test program that turns the LED on and off. This can happen when device tree overlays are loaded. For example, if the device tree overlay w1-gpio-overlay.dtb is loaded by adding the following line to /boot/config.txt
device_tree_overlay=overlays/w1-gpio-overlay.dtb
then GPIO4 will be reserved for 1-Wire devices. Running the test program will then result in the following output (which is exactly what you're seeing):
pi@raspberrypi:~/onoff $ cat test.js
var Gpio = require('onoff').Gpio;
var led4 = new Gpio(4, 'out');
blink(led4, 500);
function blink(led, period) {
led.write(1, function () {
setTimeout(function(){
led.write(0);
}, period);
});
}
pi@raspberrypi:~/onoff $ node test.js
fs.js:706
return binding.writeBuffer(fd, buffer, offset, length, position);
^
Error: EBUSY: resource busy or locked, write
at Error (native)
at Object.fs.writeSync (fs.js:706:20)
at Object.fs.writeFileSync (fs.js:1234:24)
at new Gpio (/home/pi/onoff/node_modules/onoff/onoff.js:82:8)
at Object.<anonymous> (/home/pi/onoff/test.js:2:12)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Function.Module.runMain (module.js:447:10)
pi@raspberrypi:~/onoff $
Is there something running on your Pi 2 that is reserving GPIO4? For example, is a device tree overlay being loaded and reserving GPIO4?
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musukvl
commented on August 24, 2024
1
I don't think I have any other gpio apps running.
Bug I had dtoverlay=w1-gpio in /boot/config.txt.
I removed it and test-gpio.js app it become to work.
Thanks for help.
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musukvl
commented on August 24, 2024
pi@raspberry-black:~/dev/homesen $ gpio readall
+-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | ALT0 | 1 | 3 || 4 | | | 5V | | |
| 3 | 9 | SCL.1 | ALT0 | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 0 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 1 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | ALT0 | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | ALT0 | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | ALT0 | 0 | 23 || 24 | 1 | OUT | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | OUT | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+
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fivdi
commented on August 24, 2024
Thanks for filing this issue. This shouldn't happen. I'll look into it asap.
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musukvl
commented on August 24, 2024
I have raspberry pi 2 with this issue. So I can provide any debug info you need. Restart does not help, so looks like there is some lockfile, but I have no idea what can be its name.
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fivdi
commented on August 24, 2024
No problem. Thanks for the feedback and have fun with onoff :)
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