B01BLINK
The task
P0 drives the LED through R1. OUT P0 lights it with any value but 0.
P1 is the chip's timer. IN P1 sleeps until its next tick.
Blink the LED: on for one tick, off for the next.
The board
- Resistors
- R1 330 Ω
- LEDs
- D1 red
- Probes
- CH1
Key idea
The scope shows the target band on CH1. Keep your trace inside it.
Hints
Each hint goes a step further than the one before. Open them one at a time.
Hint 1Show
The timer ticks every 20 cycles. A chip asleep on IN P1 spends no energy.
Hint 2Show
Sleep on P1, write 1 to P0, sleep again, write 0.
Solution
Reveal the Full SolutionThe complete program for BLINK. Open it only when you want the answer.
The reference program
The game's own solution. It passes every test and scores exactly par on every benchmark.
u1SC-2 standard
IN P1
MOV A, 1
OUT P0
IN P1
MOV A, 0
OUT P0- CYCLES
- 28
- at par
- ENERGY
- 56
- at par
- NODES
- 1
- at par
- INSTRUCTIONS
- 6
- at par
Another way: Mod
A second program that also passes, and beats par on INSTRUCTIONS.
Three lines: the tick count's parity is the LED.
u1SC-2 standard
IN P1
MOD 2
OUT P0- CYCLES
- 28
- at par
- ENERGY
- 56
- at par
- NODES
- 1
- at par
- INSTRUCTIONS
- 3
- under par