If everything is correct, you will see the LED blink (or your serial output appear in the terminal).

Once you have basic GPIO working, explore the "full" capabilities: simulide stm32 full

4. Results

• HAL init (clock, GPIO, I2C, SPI, ADC, SysTick)
• ADC read and calibration routine
• I2C driver for SSD1306 (or use u8g2/u8g2's HAL)
• SPI + FatFS wrapper (use ChanFS/PetitFS for small footprint)
• Simple ring buffer for log entries before commit to SD
• Error handling: status LED blink codes, retry/backoff for SD writes

Mixed-Signal Simulation

: There is no hard separation between digital and analog modes; logic pins have configurable impedance and thresholds, allowing for realistic fan-in/fan-out effects. Report: Embedded Systems Simulation with SimulIDE (STM32)