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Open Proteus, go to the Component Library, and search for "STM32" or "Blue Pill". The STM32F103C6 is the most widely supported model for basic simulation. Generate Your Code: Use an IDE like STM32CubeIDE

: Use the Oscilloscope tool to verify your signal waves.

Let’s create a simple "Blinking LED" program to test the setup.

Simulate an ILI9341 TFT display or an MCP23S17 I/O expander. SPI timing is modeled at the bit level, so your code must respect correct CPOL/CPHA settings.