Traffic Light

Finite State Machine Exercise

Task

Light the three LEDs one at a time: red on PA0, then yellow on PA1, then green on PA2. Run the sequence twice, then leave all three off. The registers and bit fields are on the Datasheet tab.

Circuit

Pass condition

Each light goes out before the next one comes on, in the order red, yellow, green. There are twelve edges, four per pin. Timing is not graded.

Notes

This question needs no clock enable. Your program is built and run at -O0, then again at -O2, and must pass both.