Lab 1 Check

machinelab test rtc
machinelab run --headless --rtc 2026-06-16T12:34:56 -- build/examples/rtc_date

Discussion Prompts

• Why does rtc_read_date receive a pointer instead of returning a struct?
• What can go wrong if the date changes between reading day, month, and year?
• Which helper belongs in labs/rtc/ and which belongs in lib/rtc/?

External Reading

• GNU C bitwise operations: https://www.gnu.org/software/c-intro-and-ref/manual/html_node/Bitwise-Operations.html
• GNU C shift operations: https://www.gnu.org/software/c-intro-and-ref/manual/html_node/Shift-Operations.html
• GNU C variadic functions: https://www.gnu.org/software/libc/manual/html_node/Variadic-Functions.html
• OSDev CMOS overview: https://wiki.osdev.org/CMOS