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[avr-gcc-list] Problem with handling interrupts

From: dfx
Subject: [avr-gcc-list] Problem with handling interrupts
Date: Tue, 14 Jan 2014 14:48:40 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0


my problem is the following:

suppose we have 8 keys all connected to the same port (for. eg. D) of an
AVR processor (eg. ATmega324) and that all pins have the interrupt enabled.

If I understand correctly, when I press any key is called the same ISR
(PCINT3_vect) and a single flag is set (PCIE3).

Question: How do I know which button was actually pressed?

thank you very much

Domenico Formenton
Tel. 06 92731757
Fax. 178 2250847
Cell. 333 7075929

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