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# See original soft_pwm.py for detailed comments.
import asyncio
from hwconfig import LED
async def pwm_cycle(led, duty, cycles):
duty_off = 20 - duty
for i in range(cycles):
if duty:
led.value(1)
await asyncio.sleep_ms(duty)
if duty_off:
led.value(0)
await asyncio.sleep_ms(duty_off)
async def fade_in_out(LED):
while True:
# Fade in
for i in range(1, 21):
await pwm_cycle(LED, i, 2)
# Fade out
for i in range(20, 0, -1):
await pwm_cycle(LED, i, 2)
loop = asyncio.get_event_loop()
loop.run_until_complete(fade_in_out(LED))
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