I²C Check-List

[Rei Vilo 695]

Quote

 

My I²C device doesn't work with Energia but works on Arduino...

 

Check the usual suspects:

• Is the I²C bus initialised?

Wire.begin();

• Does the I²C device run at 3.3V?

Otherwise, use a logic-level converter.

• Are pull-ups installed?

Try 10, 4.7 or 2.2 kΩ for the SDA and SCL lines.

• In case the LaunchPad provides multiple I²C ports, is the correct port selected?

Try 

    Wire.setModule(0); // or other port number
    Wire.begin();

• Still nothing?

Use a logic analyser to trace the signals on the I²C port.

(To be continued...)

[Markers 3]

Hi Rei,

Thanks for your response.  I have visited that link many times but the info is a bit sparse, and has not helped me.

Do you have any more specific advice please?

Thanks,

Mark

[Rei Vilo 695]

This is a FAQ. Have you started a thread for your specific case?

[Markers 3]

Rei,

No, I have not started my own thread - is that what is required?

Mark

[Rei Vilo 695]

What about I2C and MMA8452/MMA8451 accelerometer?

This thread is about a check list for I²C, not specific cases.