Modifying libiio recipe

ubermensch said:

I would like during petalinux-build for the build process to download a libiio of specific commit or to checkout that specific commit (can be through its SHA ID

Hi,

To checkout a specific commit you need to change this line... You can just replace the whole line by  SRCREV = "your SHA ID". In this case, you don't really need to check if offline build is set or not because you'll never use AUTOREV which means it will automatically work also for offline builds. 

- Nuno Sá

Just an update, using the libiio commit ID I checked out and built, the USB backend functionality got restored.

Hi,

What commit ID did you use?

-Paul

Hi pcercuei,

I used libiio commit ID c14a0f8b38e9f1ecee147324b0864b8bcf22e15b.  I think its commit date is 09/03/2021.

Hi pcercuei,

I used libiio commit ID c14a0f8b38e9f1ecee147324b0864b8bcf22e15b.  I think its commit date is 09/03/2021.

Hi, thanks.

Could you try from commit ID 803d1b15 and tell me if it works?

-Paul

I'll get back to you pcercuei tomorrow regarding this commit ID.

What's the date for this commit ID 803d1b15?  I can't find it in libiio's gitk.

I just pushed it a few minutes ago. It's the branch 'iiod-fix-usb-read-line', which has only one commit on top of the current master.

Hello Paul,

I've tried it, with this libiio commit (803d1b15) being the only change I did.  Initial testing on my side shows I lost my USB backend again, similar to the previous build before I changed to commit c14a0f8b3.  IIOD can scan and somehow see my device in USB, but in-depth accesses by iio_info, iio_readdev, iio_reg fails.

~$ lsusb
Bus 002 Device 004: ID 04d9:a0ac Holtek Semiconductor, Inc.
Bus 002 Device 005: ID 1a2c:2d23 China Resource Semico Co., Ltd
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 013: ID 04b4:0008 Cypress Semiconductor Corp.
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 2357:010c  
Bus 003 Device 019: ID 0456:b671 Analog Devices, Inc.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

~$ iio_info -s
Library version: 0.23 (git tag: 92d6a35)
Compiled with backends: local xml ip usb serial
Unable to create Local IIO context : No such file or directory (2)
Available contexts:
    0: 0456:b671 (Analog Devices Inc. Generic USB IIOD), serial=00000000 [usb:3.19.0]

~$ iio_info -u usb:3.19.0
Library version: 0.23 (git tag: 92d6a35)
Compiled with backends: local xml ip usb serial
Unable to create IIO context usb:3.19.0: Invalid argument (22)

~$ iio_readdev -u usb:3.19.0 -b 1024 -s 1024 iio:device0 > samples.dat
Unable to create IIO context usb:3.19.0: Invalid argument (22)

~$ iio_info -S usb
Library version: 0.23 (git tag: 92d6a35)
Compiled with backends: local xml ip usb serial
Available contexts:
    0: 0456:b671 (Analog Devices Inc. Generic USB IIOD), serial=00000000 [usb:3.19.0]

~$ iio_info -S
Library version: 0.23 (git tag: 92d6a35)
Compiled with backends: local xml ip usb serial
Available contexts:
    0: 0456:b671 (Analog Devices Inc. Generic USB IIOD), serial=00000000 [usb:3.19.0]

~$ iio_reg -u usb:3.19.0 iio:device0 0x0
Unable to create IIO context usb:3.19.0: Invalid argument (22)
Segmentation fault (core dumped)

~$ iio_readdev -u usb:3.19.0 -b 1024 -s 1024 iio:device0 > samples.dat
Unable to create IIO context usb:3.19.0: Invalid argument (22)

~$ iio_info -u usb:3.19.0
Library version: 0.23 (git tag: 92d6a35)
Compiled with backends: local xml ip usb serial
Unable to create IIO context usb:3.19.0: Invalid argument (22)

Thanks for the feedback.

-Paul

I think I properly fixed it now. This time I tested it myself as well. The fix: iiod: fix read_line() for USB by pcercuei · Pull Request #756 · analogdevicesinc/libiio (github.com)

The fix is commit 08e1b88.

Hi pcercuei,

I just tested the iiod-fix-usb-read-line branch of libiio with the 08e1b88 commit ID in Linux.  Initial testing on my side is showing that the USB backend is working.  IIOD can scan and see my device in USB via iio_info -s, and also further access by iio_info -u usb<USB uri> is working.  iio_readdev and iio_reg are also working as they are returning data from the Zedboard unlike before.

I also tested this in Windows and looks good too.  Zedboard gets detected as USB device in Dev Manager.  iio_info, iio_readdev and iio_reg also works in Windows.

Perfect, thanks!