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Overview

The flight computer communicates with peripherals (radios, sensors, actuators) over hardware buses. NOS3 hwlib provides drivers for seven bus types, all of which are link-time substituted in simulation: the same FSW binary runs on real hardware or in NOS3, with only the linked driver library changing.

  • UART — serial interface to the radio
  • SPI — synchronous full-duplex bus for sensors
  • I2C — two-wire bus for low-rate sensors
  • CAN — differential bus for subsystem communication
  • UDP/TCP — network sockets for simulation and ground links

GPIO​

General Purpose I/O. Direct pin-level control for simple signals (enable lines, status flags, interrupt triggers).