Hi, I had been able to correctly use a LCD connected to I2C-4 (pins 34/35). After a OS reinstall on the microsd, now I don't see it connected anymore on i2cdetect -y 3. Some troubleshooting?
What os did you reinstall? udoobuntu 2 rc1? Can you do it again? Perhaps something went wrong with creating the image on the SD. Do you see the i2c-4 mapped to the pins on the device tree editor? Did you do a reset to default on the device tree editor and reboot?
Yes I installed UDOObuntu 2 RC1. I2C-4 was shown on pins 34/35 in red in the device tree editor. I will try the reset to default and reboot. If it doesn't help I will try reinstalling the OS and let you know.
Dear guys, we've very recently passed to UDOObuntu 2 RC2, you may have missed it: http://www.udoo.org/download-udoobuntu-2-rc2/
Ok now I'm on RC2. Same problem as before, I can't see devices connected to i2c4. I attach a screenshot of the device tree editor, in which the i2c4 functionality is properly mapped to pins 34/35. What can I do to understand if the bus is working properly? As I said before, this LCD module I was able to use it properly connected to the same pins 34/35. I have others I2C devices I would like to test, a memory chip 24C256, an accelerometer MPU9265, but I can't see them listed on the bus. What can I do to understand if the i2c4 bus is working properly? Do you confirm me that pins 34/35 of bus i2c4 are the only ones where I can connect external I2C devices (since i2c2 is available only via the brick connector, and i2c1 and i2c3 are not available at all)?
