Stereo hat wont put cameras on i2c bus

Raspberry Pi Cameras sync-stereo-camera-hat
1

Hi.

I recently purchased a 5mp stereo hat. I connect it to my rpi4 and run a raspistill command and it appears to work fine. Cool.

So I navigate to the stereo_depth_demo to emulate the coolness I saw on the web.

pi@raspberrypi:~/MIPI_Camera/RPI/stereo_depth_demo $ LD_PRELOAD=/usr/lib/arm-linux-gnueabihf/libatomic.so.1 python3 1_test.py
Open camera…
Error: Could not open file /dev/i2c-0’ or/dev/i2c/0’: No such file or directory
I2C check functionality fail.
init_camera: Unexpected result.

Ok, that tells me the cameras aren’t on the i2c bus. So I check.

pi@raspberrypi:~/MIPI_Camera/RPI/stereo_depth_demo $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – – – – – – – – – – – – –
10: – – – – – – – – – – – – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – – – – – – – – – – –
40: – – – – – – – – – – – – – – – –
50: – – – – – – – – – – – – – – – –
60: – – – – – – – – – – – – – – – –
70: – – – – – – – –

Sure enough, no devices.

So here is what I’ve done to ensure the issue isn’t on my end.

  1. I read through the read me and installed the wiringpi-latest.deb since I’m on a pi-4. Same result as above.

  2. I disconnect and reconnect both camera cables as well as the pi camera cable. Same result as above.

  3. I made my own connector as I don’t want the stereo hat on top of the pi. I removed my connector and disassembled my case and put the stereo hat directly on top of the pi and used the stereo hat connector directly. Same result as above.

  4. I connected some other i2c device to my pi in order to validate the i2c bus works. It shows up and functions just fine.

Not sure what a next step would be? Please help.

I did notice that the error printed says it is looking for i2c-0, which is what it would be looking for on an older pi model. I am running a pi-4, which is i2c-1. Is the error text just misleading? Can I set which bus I want? Where?

Thanks in advance for your time and assistance.

2

Hello, You should open the /boot/config.txt file and add dtparam=i2c_vc=on to use the i2c0 bus.

3

Excellent. That worked. Thank you. I saw that in the manual, but assumed the line was meant for older versions of pis and I needed to enable the raspberry pi4’s master i2c. Since I thought I had enabled the only pi-4 i2c bus, it didn’t occur to me to add that line. My bad. Again, thank you for the help.

4

Hello,

Great to hear you have solved your problems.

Let me know if you need more help.