kopia lustrzana https://github.com/peterhinch/micropython-nano-gui
98 wiersze
3.2 KiB
Python
98 wiersze
3.2 KiB
Python
# asnano_sync.py Test/demo program for use of nanogui with uasyncio
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# Requires Pyboard for switch and LEDs.
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# Tested with Adafruit ssd1351 OLED display.
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# Copyright (c) 2020 Peter Hinch
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# Released under the MIT License (MIT) - see LICENSE file
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# Initialise hardware and framebuf before importing modules
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from color_setup import ssd # Create a display instance
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import uasyncio as asyncio
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import pyb
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import uos
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from gui.core.writer import CWriter
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from gui.core.nanogui import refresh
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from gui.widgets.led import LED
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from gui.widgets.meter import Meter
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refresh(ssd, True)
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# Fonts
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import gui.fonts.arial10 as arial10
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import gui.fonts.freesans20 as freesans20
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from gui.core.colors import *
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color = lambda v : RED if v > 0.7 else YELLOW if v > 0.5 else GREEN
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txt = lambda v : 'ovr' if v > 0.7 else 'high' if v > 0.5 else 'ok'
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class MyMeter(Meter):
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def __init__(self, x, text):
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CWriter.set_textpos(ssd, 0, 0) # In case previous tests have altered it
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wri = CWriter(ssd, arial10, GREEN, BLACK, verbose=False)
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wri.set_clip(True, True, False)
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super().__init__(wri, 5, x, divisions = 4, ptcolor=YELLOW, label=text,
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style=Meter.BAR, legends=('0.0', '0.5', '1.0'))
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self.led = LED(wri, ssd.height - 16 - wri.height, x, bdcolor=YELLOW, label ='over')
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self.task = asyncio.create_task(self._run())
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async def _run(self):
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while True:
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v = int.from_bytes(uos.urandom(3),'little')/16777216
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self.value(v, color(v))
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self.led.color(color(v))
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self.led.text(txt(v), fgcolor=color(v))
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# Slow asynchronous data acquisition might occur here. Note
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# that meters update themselves asynchronously (in a real
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# application as data becomes available).
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await asyncio.sleep(v) # Demo variable times
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async def flash(n, t):
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led = pyb.LED(n)
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try:
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while True:
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led.toggle()
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await asyncio.sleep_ms(t)
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except asyncio.CancelledError:
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led.off() # Demo tidying up on cancellation.
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class Killer:
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def __init__(self):
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self.sw = pyb.Switch()
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async def wait(self, t):
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while t >= 0:
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if self.sw():
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return True
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await asyncio.sleep_ms(50)
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t -= 50
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return False
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# The main task instantiates other tasks then does the display update process.
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async def main():
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print('Press Pyboard usr button to stop test.')
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# Asynchronously flash Pyboard LED's. Because we can.
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leds = [asyncio.create_task(flash(1, 200)), asyncio.create_task(flash(2, 233))]
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# Task for each meter and GUI LED
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mtasks =[MyMeter(2, 'left').task, MyMeter(50, 'right').task, MyMeter(98, 'bass').task]
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k = Killer()
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while True:
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if await k.wait(800): # Switch was pressed
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break
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refresh(ssd)
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for task in mtasks + leds:
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task.cancel()
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await asyncio.sleep_ms(0)
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ssd.fill(0) # Clear display at end.
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refresh(ssd)
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def test():
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try:
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asyncio.run(main())
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finally: # Reset uasyncio case of KeyboardInterrupt
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asyncio.new_event_loop()
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print('asnano_sync.test() to re-run test.')
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test()
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