Teensy Flash Example

Instructions for building with a teensy40 board.

Build/Flash/Run

Create the out build directory.

gn gen out --export-compile-commands --args='
    pw_arduino_build_CORE_PATH="//third_party/pigweed/third_party/arduino/cores"
    pw_arduino_build_CORE_NAME="teensy"
    pw_arduino_build_PACKAGE_NAME = "teensy/avr"
    pw_arduino_build_BOARD="teensy40"
    pw_arduino_use_test_server=false'

Patch arduino core.

Running the following command after installing the arduino core:

sed -i -e 's/^static void flash_/void flash_/' third_party/pigweed/third_party/arduino/cores/teensy/hardware/teensy/avr/cores/teensy4/eeprom.c

Run the compile.
```
ninja -C out
```

Flash and run test.

arduino_unit_test_runner --config out/arduino_debug/gen/arduino_builder_config.json --upload-tool teensyloader --verbose out/arduino_debug_tests/obj/source/teensy_flash/test/teensy_flash_test.elf

You should see something somewhat similar to:

DBG Successfully flashed firmware to device
INF [==========] Running all tests.
INF [ RUN      ] FlashPartitionTest.FillTest
INF DBG  FillTest iteration 0, write '0'
INF DBG  FillTest iteration 0, write '0xff'
INF DBG  FillTest iteration 0, write '0x55'
INF DBG  FillTest iteration 0, write '0xa3'
INF DBG  Completed iterations 0, Total errors 0
INF DBG  FillTest iteration 1, write '0'
INF DBG  FillTest iteration 1, write '0xff'
INF DBG  FillTest iteration 1, write '0x55'
INF DBG  FillTest iteration 1, write '0xa3'
INF DBG  Completed iterations 1, Total errors 0
INF [       OK ] FlashPartitionTest.FillTest
INF [ RUN      ] FlashPartitionTest.EraseTest
INF [       OK ] FlashPartitionTest.EraseTest
INF [ RUN      ] FlashPartitionTest.AlignmentCheck
INF [       OK ] FlashPartitionTest.AlignmentCheck
INF [ RUN      ] FlashPartitionTest.IsErased
DBG [       OK ] EmptyInitializedKvs.Basic
DBG [==========] Done running all tests.
DBG [  PASSED  ] 4 test(s).
INF Test passed!