Power analysis

In commit f7e40b1b5879242b4ce59854dbbadb44fe5f75e4, I re-implemented sleep/wakeup for all devices (touchpanel, display, NOR Flash, SPI and TWI).
I checked (using the logs) that all Sleep() and Wakeup() method are called in the correct order.
I also checked that the MCU is put in deep sleep with a logic analyzer (the MCU is in deepsleep during the call to __WFE() in port_cmsis_systick.c).

Now, I think it would be very interesting to actually measure the power consumption of InfiniTime while running different use-cases:

• Display the Clock Screen
• BLE disconnected/connected
• BLE advertising (BLE advertising is enabled for 3 minutes after a wakeup) and continue even if the soft is in sleep mode -> measure power for more than 3 minutes after switch off the screen).
• ...

But... I do not have the necessary instruments and knowledge to do the measurement by myself.

If anyone has the setup and instruments necessary to measure the power consumed by InfiniTime, just write a comment to this issue !

Also, if you can, just leave your Pinetime running this commit (f7e40b1b5879242b4ce59854dbbadb44fe5f75e4) or a next one just to see how long it runs on battery!

Thanks

Start by reviewing commit f7e40b1b5879242b4ce59854dbbadb44fe5f75e4 and port_cmsis_systick.c, then reproduce the listed Clock Screen, BLE, advertising, and sleep scenarios on a Pinetime. Done means collecting power measurements for the scenarios and, if possible, recording battery runtime; the issue does not specify a measurement setup or test location.