111 lines
3.1 KiB
Markdown
111 lines
3.1 KiB
Markdown
# Setup
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Before you can build, you will need to run the following commands once:
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```
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$ cd circuitpython
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$ git submodule update --init
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$ make -C mpy-cross
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```
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You then need to download the SD and Nordic SDK files:
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> This script relies on `wget`, which must be available from the command line.
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```
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$ cd ports/nrf
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$ ./drivers/bluetooth/download_ble_stack.sh
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```
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# Building and flashing firmware images
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## Building CircuitPython
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#### REPL over UART (default settings)
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To build a CircuitPython binary with default settings for the
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`feather52` target enter:
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```
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$ make BOARD=feather52 V=1
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```
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#### REPL over BLE UART (AKA `NUS`)
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To build a CircuitPython binary with REPL over BLE UART, edit
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`bluetooth_conf.h` with the following values (under
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`#elif (BLUETOOTH_SD == 132)`):
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```
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#define MICROPY_PY_BLE (1)
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#define MICROPY_PY_BLE_NUS (1)
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#define BLUETOOTH_WEBBLUETOOTH_REPL (1)
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```
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Then build the CircuitPython binary, including `SD=s132`
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to enable BLE support in the build process:
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```
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$ make BOARD=feather52 V=1 SD=s132
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```
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## Flashing with `nrfutil`
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The Adafruit Bluefruit nRF52 Feather ships with a serial and OTA BLE bootloader
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that can be used to flash firmware images over a simple serial connection,
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using the on-board USB serial converter.
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These commands assume that you have already installed `nrfutil`, as described
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in the [learning guide](https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/arduino-bsp-setup)
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for the Arduino variant of the board.
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### 1. **Update bootloader** to single-bank version
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The Adafruit nRF52 Feather ships, by default, with a **dual-bank** bootloader
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that cuts the available flash memory in half in exchange for safer
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OTA updates.
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Due to the size of CircuitPython, we must migrate this bootloader to a
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**single-bank** version, doubling the amount of flash memory available to us.
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> These commands only need to be run once and will update the SoftDevice and
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bootloader from the dual-bank version that ships on Arduino-based Adafruit
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Feather52 boards to a single-bank CircuitPython compatible version:
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#### S132 v2.0.1 single-bank (recommended):
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By default s132 v2.0.1 is used when no `SOFTDEV_VERSION` field is passed in:
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```
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$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART boot-flash
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```
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#### S132 v5.0.0 (BLE5, experimental):
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To enable BLE5 support and the latest S132 release, flash the v5.0.0 bootloader via:
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```
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$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART SOFTDEV_VERSION=5.0.0 boot-flash
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```
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### 2. Generate a CircuitPython DFU .zip package and flash it over serial
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The following command will package and flash the CircuitPython binary using the
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appropriate bootloader mentionned above.
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This command assumes you have already build a valid circuitpython
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image, as described earlier in this readme.
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> The name of the serial port target will vary, depending on your OS.
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```
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$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART dfu-gen dfu-flash
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```
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If you built your CircuitPython binary with **BLE UART** support you will
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need to add the `SD=s132` flag as shown below:
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```
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$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART SD=s132 dfu-gen dfu-flash
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```
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