Optiga Trust M not detected on i2c scanner app.

Infineon / optiga-trust-m

OPTIGA™ Trust M Software Framework

https://infineon.github.io/optiga-trust-m/

MIT License

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Optiga Trust M not detected on i2c scanner app. #64

Closed markandpathak closed 3 years ago

markandpathak commented 3 years ago

Hello,

We are using Optiga Trust M SLS32AIA chip for one of our project. Problem is that we can not find the chip on any I2C scanner app. We tried to read register values (For example registers: 0x82). We also checked hardware:

Vin : 3.3V
SCL/SDA Pins 3.3V in idle state
RST at 3.3V

We can not figure out what is causing this:

Can it be chip in sleep mode? In that all we need to do is just keep pinging IC until it replies?
We are directly trying to read register 0x82, it this approach correct or we need to write 0x82 to address 0x80 to get response?
If all fails then why chip is not detected on I2C scanner?

ayushev commented 3 years ago

Hello @markandpathak

where the i2c detect app is located, is it a linux machine? Then this can be usefull. Otherwise this reply also might be helpfull

markandpathak commented 3 years ago

Sorry for the incomplete details. I am using I2Ctools by ESP-IDF on a ESP32-S2 module which includes a command i2cdetect. Also written a small code to try to read register 0x82. As per your previous answer we checked that the I2C address is shifted to 7 bit and read byte is appended correctly.

markandpathak commented 3 years ago

I am also following #34 to test a working example azure-optga-trust-m provision_test_certificate. I was able to successfully build the code for esp32-s2 but I could not figure out where to provide GPIO numbers for SCL, SDA and RST as I have different GPIOs allocated for I2C.

ayushev commented 3 years ago

Unless you have a specific usecase in mind, I would recomend you to use the framework, for instance make the azure example work (what you are trying to do)