InfiniTime/doc/PinetimeStubWithNrf52DK.md

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# Build a stub for PineTime using NRF52-DK
[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.
This development kit can be very useful for PineTime development:
- You can use its embedded JLink SWD programmer/debugger to program and debug your code on the PineTime
- As it's based on the same SoC than the PineTime, you can program it to actually run the same code as the PineTime.
2021-12-05 23:04:35 +03:00
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).
This stub only implements the display, the button and the BLE radio. The other features from the pintime are missing:
- heart rate sensor
- SPI flash
- touchpad
- accelerometer
These devices could be added on this stub, but I do not have the parts to try them out for now.
![Pinetime stub](../images/pinetimestub1.jpg "PinetimeStub")
Here are the parts you need to build this simulator:
- [NRF52-DK](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52-DK)
- An ST7889 display (I bought [this one](https://www.aliexpress.com/item/32859772356.html?spm=a2g0s.9042311.0.0.1b774c4dSoc4Xz))
- A push-button (the one I use comes from a previous project build around ESP8266 board Wemos D1 Mini).
- Dupont wires
You just need to make the following connections:
| NRF52-DK | ST7889 display |
| -------- | -------------- |
| VDD | VCC |
| GND | GND |
| P0.03 | SDA |
| P0.26 | RES |
| P0.02 | SCL |
| P0.18 | DC |
| NRF52-DK | Push Button |
| -------- | ------------------------- |
| P0.13 | Button IN (D3 in my case) |
| GND | GND |
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:
| NRF52 -DK | NRF52- DK |
| --------- | --------- |
| DETECT | GND |
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.