diff options
Diffstat (limited to 'blinky.py')
| -rw-r--r-- | blinky.py | 73 |
1 files changed, 59 insertions, 14 deletions
@@ -1,28 +1,73 @@ -from amaranth import Elaboratable, Module, Signal +from amaranth import Elaboratable, Module, Signal, Cat from amaranth.build import Platform from platform_alchitry_pt_v2 import AlchitryPtV2Platform -class Blinky(Elaboratable): +class LEDRunner(Elaboratable): def elaborate(self, platform: Platform) -> Module: m = Module() - # Get the LED pins - led = platform.request("led", 0) - - # Create a counter for timing - counter = Signal(24) - - # Increment counter every clock cycle + # 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) - - # Connect the MSB of counter to LED (blinks at ~12Hz at 100MHz) - m.d.comb += led.o.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(Blinky(), do_program=True) + platform.build(LEDRunner(), do_program=True) |