DLPDLCR230NPEVM: I2C Bus

Mark Philip Felipe

Part Number: DLPDLCR230NPEVM

Hi Team, seeking some support.

Following the TI tutorial "[FAQ] DLPDLCR230NPEVM: DLPDLCR230NPEVM Quick-Start Tutorial" found in the following link:

https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/1171130/faq-dlpdlcr230npevm-dlpdlcr230npevm-quick-start-tutorial

I followed all the previous steps, including steps 21, 22, 23 by setting the I2C bus to 22 and altering the "DEFAUL_I2C_BUS = {num}” to 22 (shown in attachments 2 and 3).

I'm having problems with the last step (Step 24). After I executed the command python init_parallel_mode.py I got an error (shown in attachment 1) and now my EVM no longer projects, not even the sample python code (sample05_led.py).

After executing this command (python init_parallel_mode.py), now the 1b field is no longer populated in i2c bus number 22 (attachment 4), and won't get populated again by following the previous steps (DEFAUL_I2C_BUS is still equal to 22 in the i2c.py file).

Thank you.

-Mark

over 2 years ago

0 John McKnight over 2 years ago

TI__Expert 7035 points

Hello Mark,

Where you able to run any scripts at all? Is the parallel mode script the only one that is causing you issues? Inside of /dev did you also have a file named ' i2c-22'?

Are you certain that the TI config file was copied over correctly too?

Regards,

John

0 Mark Philip Felipe over 2 years ago in reply to John McKnight

TI__Genius 10870 points

Hi John,

I used to be able to run the sample scripts such as sample05_led.py until I executed the command python init_parallel_mode.py and got an error (shown in attachment 1) and now my EVM no longer projects. In the terminal window the script is shown as running but the EVM is not projecting anything. There is no "i2c-22" file, only "i2c.py" (attachment "3").

Regarding the config file, I did follow step 15 of the TI tutorial I mentioned before: "Go to the DLP230NP-RPi-PYTHON-AUG19 python support folder downloaded from the 230NPEVM product page. Inside of the python support folder there should is be a config file under the sample-config directory. Copy that file into the boot drive on the microSD to replace the default config.txt file".

Thank you.

0 Mayank Khandelwal over 2 years ago in reply to Mark Philip Felipe

TI__Genius 9971 points

Hello Mark,

Thanks for your clarification here, our team will get back to you with an update by tomorrow.

Regards,

Mayank

0 Austin Snyder over 2 years ago in reply to Mark Philip Felipe

TI__Genius 12785 points

Hello Mark,

It would help to see this error, but I am not finding the attachment. Would you mind posting the errors to a thread?

Regards,

Austin

0 Mark Philip Felipe over 2 years ago in reply to Austin Snyder

TI__Genius 10870 points

Hi Austin,

Please see the attachments.

/cfs-file/__key/communityserver-discussions-components-files/94/sn_5F00_customerservice_5F00_case_5F00_e160ae3d97dc255082c3348c1253af3a_5F00_attachments.zip

Thank you.

0 Austin Snyder over 2 years ago in reply to Mark Philip Felipe

TI__Genius 12785 points

Hello Mark,

Thank you for the link to the attachments.

This is peculiar. I am supposing that these images are sequential meaning that the I2C bus was found to be 22 (2.png), you set the DEFAULT_I2C_BUS to 22 (3.png), and then bus was no longer detected and still unable to execute init_parallel.py. Correct me if I am mistaken here.

The errors you are seeing do point to the I2C bus not being established. You mention that there is no i2c-22 file in /dev. Can you say what Raspberry PI OS image was flashed onto the EVM? Is this the Debian Bullseye port released 2022-9-22? What files do you see in /dev?

To confirm, you are using a Raspberry Pi 4B?

Regards,

Austin

0 Mark Philip Felipe over 2 years ago in reply to Austin Snyder

TI__Genius 10870 points

Hi Austin,

you are correct, the 1b field is no longer populated. After I executed the command init_parallel_mode.py the EVM stopped projecting the sample python code. I used the Raspberry Pi imager v1.7.3 (picture attached) to flash the image ( Debian Bullseye 2022-9-22) onto a SanDisk 64GB Extreme connected to my Raspberry Pi 4 Model B (8gb). I have attached a picture of the folders and files uploaded to the EVM. I don't think there's any folder or files called dev.

0 John McKnight over 2 years ago in reply to Mark Philip Felipe

TI__Expert 7035 points

Hello Mark,

Can you click on the raspberry pi logo on the top left hand side of the terminal > Preferences > Raspberry Pi Configuration > interfaces and check that both SPI and I2C are on?

In your third photo, left had side, above the jcatalan folder there is the /dev folder. This is where RPi will set what I2C bus it is expecting.

Regards,

John

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DLPDLCR230NPEVM: I2C Bus