nRF51822 and Framed Loop environment

[Vladimir Plotkin]

I am planning to write a simple OS for nRF51822 based on framed loop principle. Nothing fancy, just bog standard 10mS frame and optional round robin scheduler.

The questions are:

1. Will the Softdevice coexist with such an OS? My guess is that the answer is "yes" but I'd like to verify this before I spend several weeks writing/debugging the code,
2. Are Nordic own drivers support non-blocking mode? For example, if application would like to send some data via SPI it shall give a command to driver and then driver will send data in parallel with application execution. Then the driver sets a flag indicating that the task has been completed. My gut feeling is that the answer is "no" but again, I'd like to check this prior to start designing the OS/Application.

[Ole Morten]

As long as you don't ever disable all interrupts, and don't use interrupt priorities 0 and 2, I can't see any problems with such approach.

Most of the examples and hardware drivers in the SDK are not implemented in a non-blocking fashion, so this will most likely require quite substantial modifications on your end. You may be better off just re-writing them from scratch instead of trying to base yourself on the SDK modules.

[Vladimir Plotkin]

Thank you. To be honest, I expected that but was still hoping that you have some collection of non-blocking drivers in some well-hidden totally-secret place. :)