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Nordic nRF boards (``microbit``)
================================
The `Nordic nRF`_ chips are a family of ARM-based System-on-Chip that
are designed to be used for low-power and short-range wireless solutions.
.. _Nordic nRF: https://www.nordicsemi.com/Products
The nRF51 series is the first series for short range wireless applications.
It is superseded by the nRF52 series.
The following machines are based on this chip :
- ``microbit`` BBC micro:bit board with nRF51822 SoC
There are other series such as nRF52, nRF53 and nRF91 which are currently not
supported by QEMU.
Supported devices
-----------------
* ARM Cortex-M0 (ARMv6-M)
* Serial ports (UART)
* Clock controller
* Timers
* Random Number Generator (RNG)
* GPIO controller
* NVMC
* SWI
Missing devices
---------------
* Watchdog
* Real-Time Clock (RTC) controller
* TWI (i2c)
* SPI controller
* Analog to Digital Converter (ADC)
* Quadrature decoder
* Radio
Boot options
------------
The Micro:bit machine can be started using the ``-device`` option to load a
firmware in `ihex format`_. Example:
.. _ihex format: https://en.wikipedia.org/wiki/Intel_HEX
.. code-block:: bash
$ qemu-system-arm -M microbit -device loader,file=test.hex
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