I2C slave : How to know the end of transaction/STOP-detection

[shoichikojima]

Hi, fellow developers,

I'm going to implement I2C feature on Kinetis-serise MCUs.

As its Slave-behaving control, how can I know the STOP condition on the bus ?

Furtherly, how about detecting ReSTART condition ?

Such event is not listed in possible causes of IICIF=1.

Regards,

[adriansc · Accepted solution]

Hello Shoichi,

You can check the stop condition register with  I2Cx_FLT STOPF bit. The description is in the image below.

Try using an Oscilloscope and check that the frame is right or if something is lost.

Hope this helps.