kopia lustrzana https://github.com/peterhinch/micropython-nano-gui
130 wiersze
3.8 KiB
Python
130 wiersze
3.8 KiB
Python
# epd29_async.py Demo program for nano_gui on an Adafruit 2.9" flexible ePaper screen
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# Released under the MIT License (MIT). See LICENSE.
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# Copyright (c) 2020 Peter Hinch
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# color_setup must set landcsape True, asyn True and must not set demo_mode
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from cmath import exp, pi
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import asyncio
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from color_setup import ssd
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# On a monochrome display Writer is more efficient than CWriter.
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from gui.core.writer import Writer
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from gui.core.nanogui import refresh
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from gui.widgets.meter import Meter
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from gui.widgets.label import Label
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from gui.widgets.dial import Dial, Pointer
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# Fonts
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import gui.fonts.arial10 as arial10
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import gui.fonts.font6 as small
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ssd._asyn = True # HACK to make it config agnostic
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# Some ports don't support uos.urandom.
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# See https://github.com/peterhinch/micropython-samples/tree/master/random
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def xorshift64star(modulo, seed=0xF9AC6BA4):
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x = seed
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def func():
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nonlocal x
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x ^= x >> 12
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x ^= (x << 25) & 0xFFFFFFFFFFFFFFFF # modulo 2**64
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x ^= x >> 27
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return (x * 0x2545F4914F6CDD1D) % modulo
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return func
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async def compass(evt):
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wri = Writer(ssd, arial10, verbose=False)
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wri.set_clip(False, False, False)
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v1 = 0 + 0.9j
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v2 = exp(0 - (pi / 6) * 1j)
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dial = Dial(
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wri, 5, 5, height=75, ticks=12, bdcolor=None, label="Direction", style=Dial.COMPASS
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)
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ptr = Pointer(dial)
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while True:
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ptr.value(v1)
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v1 *= v2
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await evt.wait()
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async def multi_fields(evt):
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wri = Writer(ssd, small, verbose=False)
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wri.set_clip(False, False, False)
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nfields = []
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dy = small.height() + 10
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row = 2
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col = 100
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width = wri.stringlen("99.990")
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for txt in ("X:", "Y:", "Z:"):
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Label(wri, row, col, txt)
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nfields.append(Label(wri, row, col, width, bdcolor=None)) # Draw border
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row += dy
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random = xorshift64star(2 ** 24 - 1)
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while True:
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for _ in range(10):
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for field in nfields:
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value = random() / 167772
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field.value("{:5.2f}".format(value))
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await evt.wait()
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async def meter(evt):
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wri = Writer(ssd, arial10, verbose=False)
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wri.set_clip(False, False, False)
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row = 10
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col = 170
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args = {"height": 80, "width": 15, "divisions": 4, "style": Meter.BAR}
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m0 = Meter(wri, row, col, legends=("0.0", "0.5", "1.0"), **args)
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m1 = Meter(wri, row, col + 40, legends=("-1", "0", "+1"), **args)
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m2 = Meter(wri, row, col + 80, legends=("-1", "0", "+1"), **args)
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random = xorshift64star(2 ** 24 - 1)
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while True:
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steps = 10
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for n in range(steps + 1):
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m0.value(random() / 16777216)
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m1.value(n / steps)
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m2.value(1 - n / steps)
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await evt.wait()
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async def main():
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refresh(ssd, True) # Clear display
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await ssd.wait()
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print("Ready")
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evt = asyncio.Event()
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asyncio.create_task(meter(evt))
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asyncio.create_task(multi_fields(evt))
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asyncio.create_task(compass(evt))
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while True:
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# Normal procedure before refresh, but 10s sleep should mean it always returns immediately
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await ssd.wait()
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refresh(ssd) # Launches ._as_show()
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await ssd.updated()
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# Content has now been shifted out so coros can update
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# framebuffer in background
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evt.set()
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evt.clear()
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await asyncio.sleep(10) # Allow for slow refresh
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tstr = """Test of asynchronous code updating the EPD. This should
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not be run for long periods as the EPD should not be updated more
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frequently than every 180s.
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"""
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print(tstr)
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try:
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asyncio.run(main())
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except KeyboardInterrupt:
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# Defensive code: avoid leaving EPD hardware in an undefined state.
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print("Waiting for display to become idle")
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ssd.sleep() # Synchronous code. May block for 5s if display is updating.
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finally:
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_ = asyncio.new_event_loop()
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