Tiny STM103T


Platform ST STM32: The STM32 family of 32-bit Flash MCUs based on the ARM Cortex-M processor is designed to offer new degrees of freedom to MCU users. It offers a 32-bit product range that combines very high performance, real-time capabilities, digital signal processing, and low-power, low-voltage operation, while maintaining full integration and ease of development.

Microcontroller STM32F103TBU6
Frequency 72MHz
Flash 128KB
Vendor HY


Please use hy_tinystm103tb ID for board option in “platformio.ini” (Project Configuration File):

platform = ststm32
board = hy_tinystm103tb

You can override default Tiny STM103T settings per build environment using board_*** option, where *** is a JSON object path from board manifest hy_tinystm103tb.json. For example, board_build.mcu, board_build.f_cpu, etc.

platform = ststm32
board = hy_tinystm103tb

; change microcontroller
board_build.mcu = stm32f103tbu6

; change MCU frequency
board_build.f_cpu = 72000000L


Tiny STM103T supports the next uploading protocols:

  • blackmagic
  • dfu
  • jlink
  • serial
  • stlink

Default protocol is dfu

You can change upload protocol using upload_protocol option:

platform = ststm32
board = hy_tinystm103tb

upload_protocol = dfu


PIO Unified Debugger - “1-click” solution for debugging with a zero configuration.


You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions and configuration information.

You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Tiny STM103T does not have on-board debug probe and IS NOT READY for debugging. You will need to use/buy one of external probe listed below.

Compatible Tools On-board Default
Black Magic Probe   Yes


Name Description
Arduino Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.
STM32Cube STM32Cube embedded software libraries, including: The HAL hardware abstraction layer, enabling portability between different STM32 devices via standardized API calls; The Low-Layer (LL) APIs, a light-weight, optimized, expert oriented set of APIs designed for both performance and runtime efficiency.