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Using more than one inputs for EXTI of STM32 - Help!

Question asked by thieu.toan on Nov 2, 2012
Dear Friends,

I would like to use more than one pins PA0, PB0, PC0 for external interrupt 0, for detecting 3 buttons. I tested with PA0 and it's working well but I want to expand more PINS in similar interrupt. 

Does anyone do this job before? If we can do that, how we configure in library?
Please give me a help! Thank you so much.
Toan Thieu