maemo.org - Talk - View Single Post - Producing Qwerty OtherHalf --order counter: 75/75 --ordering closed

kulve	2013-10-08 , 12:10
Posts: 59 \| Thanked: 66 times \| Joined on May 2007	#48

Originally Posted by dirkvl

I imagine a simple i2c i/o explander will have to use polling, can a microcontroller send out a signal when connected to power that it is in use?

If there's only I2C, then no.

In I2C only master (i.e. the phone in this case) can initiate communication. Hence if there is not separate interrupt line that the other half can use to notify the main cpu that it has something to tell, the main cpu needs to constantly poll the other half for status.

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