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from amaranth import Elaboratable, Module, Signal, Cat
from amaranth.build import Platform
from platform_alchitry_pt_v2 import AlchitryPtV2Platform
class LEDRunner(Elaboratable):
def elaborate(self, platform: Platform) -> Module:
m = Module()
# Get all 8 LED pins
leds = [platform.request("led", i) for i in range(8)]
# Create timing counter for LED movement
counter = Signal(23) # ~0.084 seconds per step at 100MHz
# Create position counter (0-15 for back-and-forth pattern)
position = Signal(4)
direction = Signal() # 0 = right, 1 = left
# LED pattern register
led_pattern = Signal(8)
m.d.sync += counter.eq(counter + 1)
# Update position when counter overflows (every ~0.084 seconds at 100MHz)
with m.If(counter == 0):
with m.If(direction == 0): # Moving right
with m.If(position == 7):
m.d.sync += direction.eq(1) # Change direction
with m.Else():
m.d.sync += position.eq(position + 1)
with m.Else(): # Moving left
with m.If(position == 0):
m.d.sync += direction.eq(0) # Change direction
with m.Else():
m.d.sync += position.eq(position - 1)
# Create running LED pattern with trailing effect
# Use upper bits for dimming trail effect
trail_on = counter[22] # Creates 50% duty cycle for trail LEDs
with m.Switch(position):
for i in range(8):
with m.Case(i):
# Build pattern for this position
pattern_bits = []
for led_idx in range(8):
if led_idx == i:
# Main LED always on
pattern_bits.append(1)
elif led_idx == i-1 and i > 0:
# Left trail LED (dimmed)
pattern_bits.append(trail_on)
elif led_idx == i+1 and i < 7:
# Right trail LED (dimmed)
pattern_bits.append(trail_on)
else:
# Other LEDs off
pattern_bits.append(0)
m.d.comb += led_pattern.eq(Cat(*pattern_bits))
# Connect LED pattern to actual LEDs
for i, led in enumerate(leds):
m.d.comb += led.o.eq(led_pattern[i])
return m
if __name__ == "__main__":
platform = AlchitryPtV2Platform()
platform.build(LEDRunner(), do_program=True)
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