Here's my simplest FTDI EVE2 TFT display project for STM32F103 (bluepill) running Roger Clark's Arduino_STM32 code base. I included my simple command line Makefile to develop without the Arduino IDE.

This program tests commands from the Serial and Button to control 2 LED and a 5V Relay Module (jqc3f-5vdc-c). #include <Arduino.h> /* Commands a: change LED1 s: change LED2 r: change relay d: change ...