EFR32: track radio driver progress

[basilfx]

This issue is to track the progress of the integrated radio drivers of the EFR32 family (supported via EFM32).

Currently, the following boards have support:

• SLTB001a
• IKEA-tradfri

Current work:

• Initial driver based on RAIL 1.x by @kaibeckmann: here
• Non-working initial upgrade to RAIL 2.x by @basilfx: here,

TODO:

• Port RAIL 1.x driver to 2.x (@kaibeckmann drivers/rail: efr32 radio driver #9212)
  • Gecko SDK package updates
• GNRC (@kaibeckmann drivers/rail: efr32 radio driver #9212)
• ...

Caveats/comments/notes:

• RAIL 2.x supports multi-protocol (e.g. 802.15.4 and BLE). How to handle?
• RAIL 1.x/2.x is a blob with fixed ISR names (can be remapped, e.g. arm-none-eabi-objcopy librail_efr32xg1_gcc_release.a --redefine-sym FRC_PRI_IRQHandler=isr_frc_pri)

[basilfx]

So far I know @kYc0o, @pyropeter, @kaibeckmann and I are interested/looking into this.

My knowledge on radio drivers is very limited, but I can help to fix things on the EF{M, R}32 side though :-)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you want me to ignore this issue, please mark it with the "State: don't stale" label. Thank you for your contributions.