Lab 7 check

Start with loopback before running two programs. Loopback proves one endpoint can configure itself, send a byte, and receive it back through the runtime. Then run-pair checks two independent machines through a bridged serial link.

lcom-ng test uart
lcom-ng run --headless -- build/examples/uart_loopback
lcom-ng run-pair --headless build/examples/uart_peer_sender --right build/examples/uart_peer_receiver

Discussion prompts

• What fields would you add to a packet protocol built on UART bytes?
• How should a receiver recover if it starts mid-packet?
• Why is loopback useful before two-machine communication?

External reading

Read OSDev on serial ports and UARTs, plus the Wikibooks guide to 8250/16550 UART programming.