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RL-ARM / USB Power saving / Application Design

GDay to all

I'd like to ask for tips and ideas on how to build the following - or reports of what did not work ;))

A battery-powered device intended for long term battery life. We need to wake up everynow and then to check states and measure some values. So the default state in 99.9% will be "sleeping"

1) what is the suggested way to get the RL-ARM to sleep and to wake up again.
Or shall we "boot" just as if from reset (only leaving some valuable RAM unitialized

2) are there any samples out using USB and RL-ARM with tasks in order to show the integration of the Keil-USB into RL-ARM? All the USB samples I found were only bare without "OS"

3) as said above, the device will be usually sleeping. upon connection of USB, we need to wake up in order to serve the USB stack.

How would you put all that together ?

I'd tend to behave like after reset, either upon USB connection of RTC-Wakeup having a boot routine that looks for USB connection and starts the USB part only if connected.

any ideas highly appreciated .....
UB

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