[riot-notifications] [RIOT-OS/RIOT] cpu/atmega_common: pseudomodule-based pin change interrupt implementation (#11122)
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Tue Apr 30 10:39:13 CEST 2019
Of the second PCINT Port (PCINT8 ... PCINT15) the pins PE0 (PCINT8, RXD0), PJ0 (PCINT9, RXD3) and PJ1 (PCINT10/TXD3) are available on the Arduino Mega. PJ2 - PJ6 (PCINT11 - PCINT15) are not mapped.
I did not test PE0, as UART0 is used for stdio. I did expect PJ0 and PJ1 to work, as only UART 0 and UART 1 are configured in `boards/common/atmega/include/periph_conf_atmega_common.h`, and UART 2 and UART 3 remain unused. Maybe there is indeed a conflict with UART 3 due to something I did overlook. I'll try to investigate.
I would personally keep the pcint configuration in the CPU and keep it fully populated in order to keep the maintenance burden low. (E.g. `gpio_init()` does also not test for GPIO pins that are available on the MCU, but not on the board.)
May point was that I could not confirm that the pcint implementation on port 2 of the ATmega2560 is working, which blocked this PR. Disabling that port for now (with the possibility of adding it later on) would allow me to set testing on green.
But a conflict with UART seems to be indeed the likely cause for the issue here. I hope that I can have a look at that again soon.
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