format. It is targeted at 32 bit microcontrollers, but is also fit for
other embedded systems with tight (2-10 kB ROM, <1 kB RAM) memory
constraints.(http://koti.kapsi.fi/jpa/nanopb/)
How to use the example:
1. move examples/nanopb to bsp/xxxx/
2. enable macro RT_USING_NANOPB in rtconfig.h
3. regenerate the project file (scons --target=xxxx)
4. rebuild the project
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