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Error in opening MATLAB device file for LED trigger source.

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Syed Hadi 2023-4-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1946623-error-in-opening-matlab-device-file-for-led-trigger-source

评论： Prasanth Sunkara 2023-9-11

采纳的回答： Syed Hadi

在 MATLAB Online 中打开

Hi, I am using the 'MATLAB support package for Raspberry Pi hardware' using MATLAB 2023a. I have installed all the necessary files on the Pi. I began following the tutorial here:

Getting Started with MATLAB Support Package for Raspberry Pi Hardware - MATLAB & Simulink Example - MathWorks United Kingdom

I got to the first step, ran the code

rpi = raspi('IP Address','username','password');

and was met with the following error (Practice_1 is the name of the script):

Error using Practice_1

Cannot open the device file for LED trigger source.

Any help please? I followed the tutorials accurately on the MathWorks website

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Syed Hadi 2023-4-26

Hi, no I haven't got any response, I'm in contact with MathWorks about this, so I'll update this thread once we come to a solution.

Atakan Aral Ormanci 2023-4-27

I am getting the same error, i have checked the /sys/class/leds directory, it doesn't have led0 led1 led2. This might be causing the problem, i believe it has a function that when matlab is connected to RPi, it uses the leds, but in the connection phase, becouse it doesn't have the led0 activation command in the directory, it doesn't allow the connection.

But its just a guess.

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采纳的回答

Syed Hadi 2023-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/1946623-error-in-opening-matlab-device-file-for-led-trigger-source#answer_1231864

编辑：Syed Hadi 2023-5-9

Hi guys,

I've been in contact with MathWorks support and we've solved this issue.

Basically, if you follow the link below:

Raspberry Pi OS - Wikipedia

You can see a list of OS for Raspberry Pi. MATLAB doesn't support the latest versions of the OS.

What you need to do is follow the link below:

http://downloads.raspberrypi.org/raspios_armhf/images/raspios_armhf-2022-09-26/

And download the file named "2022-09-22-raspios-bullseye-armhf.img.xz".

Then, you can install the OS onto your SD Card using the normal method.

I used balenaEtcher to decompress and flash the OS onto the SD card.

The development team are now aware of this issue and will look into fixing it for future OS.

Hope this helps.

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Beryl Wicaksono 2023-6-5

Hi Syed Hadi,

are you facing ssh certificate issue after installing 2022-09-22-raspios-bullseye-armhf.img.xz? How do you resolve it?

Thanks

Prasanth Sunkara 2023-9-11

In my opinion using the official Raspberry Pi Imager tool is a better way to setup an image.

https://www.raspberrypi.com/documentation/computers/getting-started.html#using-raspberry-pi-imager

Please ensure you have enabled SSH and assigned proper hostname and user credentials. You may optionally enter the WiFi details as well.

There is an option in the Raspberry Pi imager tool to flash images from your PC too. Towards the end the list

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更多回答（2 个）

MathWorks MATLAB Hardware Team 2023-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/1946623-error-in-opening-matlab-device-file-for-led-trigger-source#answer_1231204

移动：Walter Roberson 2023-5-8

Hi All,

Follow these steps to resolve the issue,

Open Raspberry Pi terminal and execute
$ cd /opt/MATLAB/
$ sudo pkill mwUnifiedSrvr
$ sudo rm -rf *
Download and extract following zip files
In MATLAB, change your working directory to the above extracted files
Run >> applyPath.m file
Create a raspi object in matlab
>> r = raspi("myAddress",'pi','raspberry');

Thanks,

MathWorks

MATLAB Hardware Team

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Antonios Gementzopoulos 2023-5-17

I have just tried it and it works as advertised.

Beryl Wicaksono 2023-6-29

This solution is also work. I have tried it.

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Sandin Taci 2023-5-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1946623-error-in-opening-matlab-device-file-for-led-trigger-source#answer_1229159

在 MATLAB Online 中打开

Hey @Syed Hadi, try "raspberrypi instead of "raspi":

rpi = raspberrypi('IP Address','username','password')

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Sandin Taci 2023-5-4

Can you go through these steps again, I guess you skipped a step. Your hardware tab in the Simulink model does not look customized.

https://www.mathworks.com/help/supportpkg/raspberrypi/ref/getting-started-with-raspberry-pi-hardware.html

Atakan Aral Ormanci 2023-5-4

编辑：Atakan Aral Ormanci 2023-5-4

rpihardware.png

i just did the steps again and then i realised the problem is with the led.

i then tried to control a servo and it worked.

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