requires ARM Toolchain https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads tested with Version 9-2019-q4-major
For JLink - get tools from https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack
- CMSIS
- drivers
- hal
- gjntest --- console/isr example -- patterned after SmartConsole build structure
- isrtest --- console/isr example -- single Makefile