[riot-notifications] [RIOT-OS/RIOT] cpu/nrf5x: handle multiple exti pins in gpio driver (#10828)

Alexandre Abadie notifications at github.com
Sun Jan 20 18:49:21 CET 2019


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### Contribution description

The GPIO driver of nrf cpu family is only able the manage one pin interrupt line. This PR is modifying the GPIOTE driver to make it "multi channel" capable, like it's done with the other CPUs I checked (STM32, SAM0).

I'm not 100% sure of the proposed solution, though. But it works.

The bug reported in #10827 is not only affecting nrf51 but also nrf52 and nrf52840.

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### Testing procedure

To test this PR you need a physical access to nrf51dk, nrf52dk and nrf52840dk, because they all provide 4 buttons.
- Build/flash/run the `tests/buttons` application
- Press any of the 4 user buttons

With this PR, each button pressed triggers a message "Pressed BTNx". With master only pressing the last button triggers a message.

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### Issues/PRs references

fixes #10827 

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/10828

-- Commit Summary --

  * cpu/nrf5x: handle multiple exti pins in gpio driver

-- File Changes --

    M cpu/nrf5x_common/periph/gpio.c (36)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/10828.patch
https://github.com/RIOT-OS/RIOT/pull/10828.diff

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