4. SPI vs I2C Comparison
| Aspect | SPI | I2C |
|---|---|---|
| Signal lines | SCK, MOSI, MISO, SS | SDA, SCL |
| Duplex mode | Full-duplex | Half-duplex-style exchange |
| Addressing | No built-in addressing | Built-in slave addressing |
| Typical speed | Generally faster | Generally slower |
| Wiring complexity | More wires, simple protocol | Fewer wires, richer bus protocol |