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Use an I2C bus gpio I/O Port in linux

Question asked by Santiago López Pina on Feb 6, 2020
Latest reply on Feb 7, 2020 by Ruben Charles

Hi, all.

 

I'm working with a MBa6ULX board which have an TQMA6ULx. The board has an 8bit I/O port i2c with three buttons. I'm trying to get the status of these buttons by console. The I2c device has 0x21 address. 

If I execute the command i2cdetect -y 3  I get the next info:

 

If I try to read the registers of the 0x21 device:

 

Why I get the UU in the address of my I2C devices?

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