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targets: add target circuitplay-bluefruit

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Add a target for the Adafruit Circuit Playground Bluefruit, which is
based on the nRF52840. Adds the necessary code for the machine
package and the json and linker script files in the targets directory.
The machine package code is based on board_circuitplay_express.go,
with modifications made by consulting the wiring diagram on the
adafruit website here:
https://learn.adafruit.com/adafruit-circuit-playground-bluefruit/downloads

Also adds support to the uf2 conversion packacge to set the familyID
field. The Circuit Playground Bluefruit firmware rejects uf2 files
without the family id set to 0xADA52840 (and without the flag specifying
that the family id is present).
This commit is contained in:
Michael Matloob
2019-12-29 14:55:29 -05:00
committed by Ron Evans
parent 25cff20117
commit 1cb9b948bc
9 changed files with 182 additions and 10 deletions
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README.md
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@@ -46,6 +46,7 @@ You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.
The following 22 microcontroller boards are currently supported:
* [Adafruit Circuit Playground Express](https://www.adafruit.com/product/3333)
* [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
* [Adafruit Feather M0](https://www.adafruit.com/product/2772)
* [Adafruit Feather M4](https://www.adafruit.com/product/3857)
* [Adafruit ItsyBitsy M0](https://www.adafruit.com/product/3727)