[riot-notifications] [RIOT-OS/RIOT] Adds the atmega1284p CPU and the first version of the INGA board to RIOT (#7604)

Robert Hartung notifications at github.com
Wed Mar 6 09:32:19 CET 2019

@maribu There are two types of interrupts on atmel MCUs: External Interrupts and Pin Change Interrupts. External Interrupts are only available on very few pins and have dedicated interrupts (ISRs). Pin Change Interrupts can occur on any GPIO, but share one interrupt per port. GPIO_BOTH simply sets the flank (rising or falling).

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