DLPDLCR230NPEVM: How to check if the EVM is connected correctly to a Raspberry Pi 4B?

Yu-Chuan Su

Prodigy 60 points

Part Number: DLPDLCR230NPEVM

When I executed the initialization script via the following:

$ python3 init_parallel_mode.py

I got a message of

FileNotFoundError: [Errno 2] No such file or directory: '/dev/i2c-7'

There are i2c-1 and i2c-22 under /dev but no i2c-7.

I did connect them as instructed in the User’s Guide (Figure 6-1).

I guess the Raspberry Pi 4B didn't find the EVM.

Is there any way to check if the EVM is connected correctly to the Raspberry Pi 4B?

What could probably go wrong?

Thanks!

over 3 years ago

0 Cody Smith over 3 years ago

TI__Expert 3360 points

Hello,

Welcome to the TI E2E forums and thank you for your interest in DLP technology. It appears that the EVM is properly connected and being detected by the Raspberry Pi (RPi), since it shows up on i2c address 0x1b.

Please review the API python files includes (i.e. i2c.py) to see if there are modifications you will need to make to have it work properly. I will try to reproduce this issue on my Raspberry Pi to debug.

Thank you,

Chris

0 Yu-Chuan Su over 3 years ago in reply to Cody Smith

Prodigy 60 points

Many thanks for the reply!

I just copied everything I got from TI into my Raspberry Pi 4B as instructed and didn't do anything to the python files.

+1 Cody Smith over 3 years ago in reply to Yu-Chuan Su

TI__Expert 3360 points

Hello,

Change this line of code in i2c.py:

DEFAULT_I2C_BUS = 7

to:

DEFAULT_I2C_BUS = 22

Thanks,

Chris

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DLPDLCR230NPEVM: How to check if the EVM is connected correctly to a Raspberry Pi 4B?