Handling a device in a low power state

[daniel-thompson]

Hello

I'm interested in your views on wasp-os/wasp-os#7 .

Note that the problem is exaggerated for PineTime because:

1. It is essentially a production device that is shipped without the back glued on (allowing access to SWD without physical damage to the case). Being a production device there are no board resets or power switches so once the SPI NOR is put to sleep nothing can wake it up without either sending the SPI command to wake it up or allowing the battery to run completely flat.

2. The test firmware that ships with the device by default puts the SPI NOR to sleep!

Personally I'd prefer to integrate the wake up into the flash driver rather than into the board init code as has been proposed (not just to fix the problem but also because it would allow us to implement auto-sleep or sleep-now-but-wake-automatically modes within the flash driver... I'm currently looking for ways to extend battery life ;-) ).

What do you think?