GPIO IRQ edge

Baptiste

Hello,

I try to set the edge on an exported gpio pin on the UpSquare, OS is the official Linux debian ubilinux for UpSquare :
All commands are executed as root, without problem.

echo 402 > /sys/class/gpio/export
chmod 777 /sys/class/gpio/gpio402/*
echo "in" > /sys/class/gpio/gpio402/direction

Then, i try:

echo "rising" > /sys/class/gpio/gpio402/edge
I get: "echo: write error: Operation not permitted"
I check permissions: all files are root and have read/write/exec flags set.

I try to set the edge from a custom C program, executed as root. but I get the exact same error.

Any ideas ?
Maybe the pin do not support IRQ edge ?
How can I check if a pin support edge sense detection ?

Regards
Baptiste

Nicola Lunghi

Dear Baptiste

reboot the board and try the following

sudo -i
echo 402 > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio402/direction
cat /sys/class/gpio/gpio402/value

you can also check the script python that I've just added on the wiki

https://up-community.org/wiki/Pinout_UP2#Example_IRQ_test_using_Python_Periphery

If you want to access gpio with a common user you need to set an udev rule to change the default gpio user/group/permission.

If you still have problem please follow the istruction of this section of the wiki and submit the output of the sysinfo script

https://up-community.org/wiki/Software#Requesting_support_for_Linux_OS

Baptiste

Hi Nicola,

After some testing, i found :
- On UpSquare Pentium 4, irq edge detection is working. No problem on this board.

- On UpSquare Celeron, irq edge detection is not working, got the message "write error: Operation not permitted"
Tested the Python script, got "There was some uncaught error".

I check the dmesg output on the Celeron board :
[ 300.235532] broxton-pinctrl INT3452:01: pin 45 cannot be used as IRQ
[ 300.235542] genirq: Setting trigger mode 1 for irq 245 failed (intel_gpio_irq_type+0x0/0x130)


Hope this helps to debug the Celeron device ;-)

Regards,
Baptiste

Nicola Lunghi

Hi
do you have the latest bios (2.1)?
I just checked with a celeron board
please also send me the result of the sysinfo script

https://up-community.org/wiki/Software#Requesting_support_for_Linux_OS

Regards
Nicola Lunghi

David Rolfe

Hi Nicola,

Sorry to jump in on this one, but are you aware that the latest BIOS download page for the UP Squared board is completely 'empty' at the moment, and does not include anything at all?

This was mentioned in a few threads yesterday, but does not appear to have been resolved yet.

Thanks!

'Montala'

Baptiste

Hi Nicola,

In attachement, the output of sysinfo script.

DCleri

Hi Montala,

The BIOS 2.1 has been temporarily disabled for download to update the upgrade process.

At the moment if you have BIOS 1.3 you should upgrade to BIOS 1.8 as described in the download page: https://up-community.org/downloads/download/29-uefi-bios/70-upa1am18

We will provide an update and re-enable the BIOS 2.1 download before the end of the week.

Nicola Lunghi

Hi baptiste
now the situation is more clear.
[ol]
[li]You are running an old bios version (1.3) that has some problem with the interrupts. Update the bios to version 1.8
https://up-community.org/downloads/download/29-uefi-bios/70-upa1am18.
When the 2.1 bios will be available I suggest you to update to 2.1. For the interrupt to work the 1.8 is sufficient.[/li]
[li]You are running ubilinux-beta and a previous release of the kernel (4.9.18) .
I suggest that you update the system to the latest ubilinux 4 distro.
For now we don't support updating directly from the beta to the release version, so you need to reinstall the system from scratch.
After installing this version you will receive packages update via apt.
[ul]
[li]https://up-community.org/downloads/category/44-ubilinux[/li]
[li]https://up-community.org/wiki/Ubilinux[/li]
[/ul]

[/li]
[/ol]

Baptiste

Hi Nicola,

Thanks for your support, i will test that on Celeron !

Regards,
Baptiste