50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
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nRF52840 MDK USB Dongle
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=======================
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The *[nRF52840 MDK USB
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Dongle](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle)* is a small,
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low-cost development board in a USB dongle form-factor powered by an nRF52840
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with 1MB flash and 256KB RAM.
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This device is pre-installed with [Open
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Bootloader](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/programming/),
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allowing DFU upgrades over USB using Nordic [nRF
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Connect](https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Connect-for-desktop)
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or [nrfutil](https://github.com/NordicSemiconductor/pc-nrfutil/). To support
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Open Bootloader, the flash and memory layout must be adjusted slightly (details
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[here](https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial))
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from the typical nRF build; this board definition ensure the appropriate build
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configuration is used for MicroPython.
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Pinout
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------
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The [pinout
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diagram](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/#pinout-diagram)
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provides an overview of the available pins and their capabilities. All pins are
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available in MicroPython, using the pin numbers labelled in the diagram
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(excluding the leading port number, *P0*).
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The three LEDs are available either through the usual `Pin` mechanism - pins
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22-24 - or by `board.LED(n)` where n can be 1, 2 or 3.
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Build instructions
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------------------
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Follow the standard [nRF Port build instructions](../../README.md); but use
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`nrf52840-mdk-usb-dongle` as the value for `BOARD`:
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make BOARD=nrf52840-mdk-usb-dongle
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The build artifacts will be created in `build-nrf52840-mdk-usb-dongle`. Once
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built, the easiest way to deploy to the device is to open `firmware.hex` using
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*nRF Connect* and select *Write*. Detailed instructions can be found on the
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[developer
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wiki](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/programming/).
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**Note** that the regular method of deployment for the MicroPython nRF port
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(using `make deploy`) will *not* operate correctly and will overwrite the
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bootloader.
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