cpu/msp430: GPIO driver doesn't work properly

[PeterKietzmann]

Description

While reviewing/testing #9367 I observed that our MSP430 GPIO driver does not work on all port/pin configurations. Yet, I don't have a complete list of combinations that do/don't work.

Steps to reproduce the issue

Take a Z1 or TelosB (or other MSP430 based?) board and flash tests/periph_gpio. Initialize pin 6 0 as output (init_out 6 0) and toggle this pin (toggle 6 0). Monitor the voltage of the pin with an Osci or logic analyzer or multimeter or LED or ......

Expected results

The pin should toggle with each toggle command on the shell.

Actual results

The pin won't toggle.

Versions

Operating system: Ubuntu 18.04
Build environment: msp430-gcc-4.6.3

[PeterKietzmann]

@haukepetersen, @aabadie ideas?

[stale]

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