micropython-nano-gui/gui/demos/asnano.py

# asnano.py Test/demo program for use of nanogui with asyncio
# Uses Adafruit ssd1351-based OLED displays (change height to suit)
# Adafruit 1.5" 128*128 OLED display: https://www.adafruit.com/product/1431
# Adafruit 1.27" 128*96 display https://www.adafruit.com/product/1673

# Copyright (c) 2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file

# Initialise hardware and framebuf before importing modules.
from color_setup import ssd  # Create a display instance

import asyncio
import pyb
import uos
from gui.core.writer import CWriter
from gui.core.nanogui import refresh
from gui.widgets.led import LED
from gui.widgets.meter import Meter

refresh(ssd)

# Fonts
import gui.fonts.arial10 as arial10
import gui.fonts.freesans20 as freesans20

from gui.core.colors import *

CWriter.set_textpos(ssd, 0, 0)  # In case previous tests have altered it
wri = CWriter(ssd, arial10, GREEN, BLACK, verbose=False)
wri.set_clip(True, True, False)

color = lambda v: RED if v > 0.7 else YELLOW if v > 0.5 else GREEN
txt = lambda v: "ovr" if v > 0.7 else "high" if v > 0.5 else "ok"


async def meter(n, x, text, t):
    print("Meter {} test.".format(n))
    m = Meter(
        wri,
        5,
        x,
        divisions=4,
        ptcolor=YELLOW,
        label=text,
        style=Meter.BAR,
        legends=("0.0", "0.5", "1.0"),
    )
    l = LED(wri, ssd.height - 16 - wri.height, x, bdcolor=YELLOW, label="over")
    while True:
        v = int.from_bytes(uos.urandom(3), "little") / 16777216
        m.value(v, color(v))
        l.color(color(v))
        l.text(txt(v), fgcolor=color(v))
        refresh(ssd)
        await asyncio.sleep_ms(t)


async def flash(n, t):
    led = pyb.LED(n)
    while True:
        led.toggle()
        await asyncio.sleep_ms(t)


async def killer(tasks):
    sw = pyb.Switch()
    while not sw():
        await asyncio.sleep_ms(100)
    for task in tasks:
        task.cancel()


async def main():
    tasks = []
    tasks.append(asyncio.create_task(meter(1, 2, "left", 700)))
    tasks.append(asyncio.create_task(meter(2, 50, "right", 1000)))
    tasks.append(asyncio.create_task(meter(3, 98, "bass", 1500)))
    tasks.append(asyncio.create_task(flash(1, 200)))
    tasks.append(asyncio.create_task(flash(2, 233)))
    await killer(tasks)


print("Press Pyboard usr button to stop test.")
try:
    asyncio.run(main())
finally:  # Reset asyncio case of KeyboardInterrupt
    asyncio.new_event_loop()