Stm32f103rct6

STlink download wiring：

VCC --3V3

PA14-- SWDCLK

GND --GND

PA13 --SWDIO

This is the installation document of the trolley, there is an introduction of stm32 installation to the fixed position of the trolley：

https://github.com/MoebiusTech/MecanumRobot-ArduinoMega2560/blob/master/ROS%20Car%20with%20STM32MEGA2560%20Controller%20Installation%20Manual.pdf