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50 lines
2.3 KiB
Markdown
50 lines
2.3 KiB
Markdown
# Build a stub for PineTime using NRF52-DK
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[NRF52-DK](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52-DK) is the official development kit for the NRF52832 SoC from Nordic Semiconductor used in the PineTime.
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This development kit can be very useful for PineTime development:
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* You can use its embedded JLink SWD programmer/debugger to program and debug your code on the PineTime
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* As it's based on the same SoC than the PineTime, you can program it to actually run the same code as the PineTime.
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This page is about the 2nd point. We will build a stub that will allow us to run the same code you can run on the PineTime. This will allow you to work more easily if you don't have a PineTime dev kit around, if you don't want to modify your dev kit for SWD programming, or if you want to use some feature from the NRF52-DK (like power measurement).
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This stub only implements the display, the button and the BLE radio. The other features from the pintime are missing:
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* heart rate sensor
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* SPI flash
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* touchpad
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* accelerometer
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These devices could be added on this stub, but I do not have the parts to try them out for now.
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Here are the parts you need to build this simulator:
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* [NRF52-DK](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52-DK)
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* An ST7889 display (I bought [this one](https://www.aliexpress.com/item/32859772356.html?spm=a2g0s.9042311.0.0.1b774c4dSoc4Xz))
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* A push-button (the one I use comes from a previous project build around ESP8266 board Wemos D1 Mini).
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* Dupont wires
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You just need to make the following connections:
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| NRF52-DK | ST7889 display |
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| ---------|--------------- |
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| VDD | VCC |
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| GND | GND |
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| P0.03 | SDA |
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| P0.26 | RES |
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| P0.02 | SCL |
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| P0.18 | DC |
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| NRF52-DK | Push Button |
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| ---------|----------------------- |
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| P0.13 | Button IN (D3 in my case) |
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| GND | GND |
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You also need to enable the I/O expander to disconnect pins from the buttons and LED on the NRF52-DK and leave them available on the pin headers:
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| NRF52 -DK | NRF52- DK |
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| --------- | --------- |
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| DETECT | GND |
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Now, you should be able to program the SoC on the NRF52-DK board, and use it as if it was running on the PineTime. |