Blue Pill

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This article describes specifics for the Blue Pill (STM32Duino) board based on a ST STM32F103 or CKS CS32F103. The Blue Pill board is a Arduino nano like board, named Blue Pill. Older versions of the Blue Pill board featured a ST STM32F103 as target MCU while the latest version of the board is shipped with a CKS CS32F103 (CS32F103CB) instead. The board does not come with an standard debug connector but with 4 pins which can be used to connect an J-Link to the MCU.


Minimum requirements

Preparing for J-Link

The Blue Pill board does not come with a standard debug connector but populates the debug JTAG signals on a 4 header that can be found on the opposite of the USB interface. Therefore, it can be manually wired in case J-Link shall be connected to it.

The following guide will describe how the Blue Pill can be connected to your J-Link.

  • Now connect the board with e.g. jumperwires to your J-Link probe.
  • The following table shows how the Signals should be connected on both the board and J-Link side.
J-Link 20 pin debug interface Pin on eval board pads
Pin 4 (GND) GND
Pin 7 (TMS) SWIO
Pin 1 (VTref) 3V3

The resulting connection will then look like this:


  • Power the board via the USB port.
  • Verify the Connection with e.g. J-Link Commander. The output should look as follows:

CS32F103xx Connect.PNG

Debugging in SEGGER Embedded Studio

Example projects for SEGGER Embedded Studio

The following example project was created with the SEGGER Embedded Studio project wizard and runs out-of-the-box on the Blue Pill (CS32F103 MCU) board. It is a simple Hello World sample and can be downloaded here:

Hello World sample