kopia lustrzana https://github.com/peterhinch/micropython-nano-gui
epd29.py passed initial tests.
Peter Hinch
rodzic
28afb7e1e5
commit
f4c6631c91
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# epd96_demo.py Allow standard demos to run on ePaper. Customise for your hardware config
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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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# As written, supports Adafruit 2.9" monochrome EPD with interface board.
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# Interface breakout: https://www.adafruit.com/product/4224
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# Display: https://www.adafruit.com/product/4262
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# Demo of initialisation procedure designed to minimise risk of memory fail
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# when instantiating the frame buffer. The aim is to do this as early as
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# possible before importing other modules.
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# WIRING. Adafruit schematic is incorrect in that it references a nonexistent
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# SD card so that interface has an extra pin.
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# Pyb Breakout
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# Vin Vin (1)
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# Gnd Gnd (3)
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# Y8 MOSI (6)
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# Y6 SCK (4)
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# Y4 BUSY (11) (Low = Busy)
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# Y3 RST (10)
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# Y2 CS (7)
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# Y1 DC (8)
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import machine
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import gc
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from drivers.epaper.epd29 import EPD as SSD
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pdc = machine.Pin('Y1', machine.Pin.OUT_PP, value=0)
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pcs = machine.Pin('Y2', machine.Pin.OUT_PP, value=1)
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prst = machine.Pin('Y3', machine.Pin.OUT_PP, value=1)
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pbusy = machine.Pin('Y4', machine.Pin.IN)
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# Baudrate from https://learn.adafruit.com/adafruit-eink-display-breakouts/circuitpython-code-2
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# Datasheet P35 indicates up to 10MHz.
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spi = machine.SPI(2, baudrate=1_000_000)
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gc.collect() # Precaution before instantiating framebuf
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ssd = SSD(spi, pcs, pdc, prst, pbusy) # Create a display instance
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ssd.demo_mode = True
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@ -19,8 +19,11 @@
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import framebuf
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import uasyncio as asyncio
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from micropython import const
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from time import sleep_ms, sleep_us, ticks_ms, ticks_us, ticks_diff
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_MAX_BLOCK = const(20) # Maximum blocking time (ms) for asynchronous show.
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class EPD(framebuf.FrameBuffer):
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# A monochrome approach should be used for coding this. The rgb method ensures
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# nothing breaks if users specify colors.
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@ -34,24 +37,22 @@ class EPD(framebuf.FrameBuffer):
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self._dc = dc
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self._rst = rst # Active low.
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self._busy = busy # Active low on IL0373
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self._lsc = True # TODO this is here for test purposes. There is only one mode.
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if asyn:
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self._lock = asyncio.Lock()
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self._asyn = asyn
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# ._as_busy is set immediately on start of task. Cleared
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# when busy pin is logically false (physically 1).
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self._as_busy = False
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# Public bound variables.
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# Ones required by nanogui.
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self._updated = asyncio.Event()
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# Public bound variables required by nanogui.
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# Dimensions in pixels as seen by nanogui (landscape mode).
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self.width = 296
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self.height = 128
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# Other public bound variable.
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# Special mode enables demos written for generic displays to run.
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self.demo_mode = False
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self._buffer = bytearray(self.height * self.width // 8)
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self._mvb = memoryview(self._buffer)
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mode = framebuf.MONO_VLSB if self._lsc else framebuf.MONO_HLSB # TODO check this and set mode permanently
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mode = framebuf.MONO_VLSB
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super().__init__(self._buffer, self.width, self.height, mode)
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self.init()
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@ -102,7 +103,7 @@ class EPD(framebuf.FrameBuffer):
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cmd(b'\x61', b'\x80\x01\x28') # Note hex(296) == 0x128
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# Set VCM_DC. 0 is datasheet default. I think Adafruit send 0x50 (-2.6V) rather than 0x12 (-1.0V)
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# https://github.com/adafruit/Adafruit_CircuitPython_IL0373/issues/17
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cmd(b'\x82', b'\x12') # Set Vcom to -1.0V
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cmd(b'\x82', b'\x12') # Set Vcom to -1.0V is my guess at Adafruit's intention.
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sleep_ms(50)
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print('Init Done.')
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@ -116,53 +117,93 @@ class EPD(framebuf.FrameBuffer):
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dt = ticks_diff(ticks_ms(), t)
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print('wait_until_ready {}ms {:5.1f}mins'.format(dt, dt/60_000))
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# Asynchronous wait on ready state.
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# Asynchronous wait on ready state. Pause (4.9s) for physical refresh.
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async def wait(self):
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while not self.ready():
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await asyncio.sleep_ms(100)
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# Pause until framebuf has been copied to device.
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async def updated(self):
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await self._updated.wait()
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# Return immediate status. Pin state: 0 == busy.
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def ready(self):
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return not(self._as_busy or (self._busy() == 0))
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# draw the current frame memory.
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def show(self, buf1=bytearray(1)):
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#if self._asyn:
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#self._as_busy = True
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#asyncio.create_task(self._as_show())
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#return
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t = ticks_us()
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async def _as_show(self, buf1=bytearray(1)):
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mvb = self._mvb
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cmd = self._command
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dat = self._data
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cmd(b'\x13')
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t = ticks_ms()
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wid = self.width
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tbc = self.height // 8 # Vertical bytes per column
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iidx = wid * (tbc - 1) # Initial index
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idx = iidx # Index into framebuf
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vbc = 0 # Current vertical byte count
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hpc = 0 # Horizontal pixel count
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for i in range(len(mvb)):
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buf1[0] = mvb[idx] ^ 0xff
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dat(buf1)
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idx -= wid
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vbc += 1
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vbc %= tbc
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if not vbc:
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hpc += 1
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idx = iidx + hpc
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if not(i & 0x0f) and (ticks_diff(ticks_ms(), t) > _MAX_BLOCK):
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await asyncio.sleep_ms(0)
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t = ticks_ms()
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cmd(b'\x11') # Data stop
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self._updated.set()
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self._updated.clear()
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sleep_us(20) # Allow for data coming back: currently ignore this
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cmd(b'\x12') # DISPLAY_REFRESH
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# busy goes low now, for ~4.9 seconds.
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await asyncio.sleep(1)
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while self._busy() == 0:
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await asyncio.sleep_ms(200)
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self._as_busy = False
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# draw the current frame memory.
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def show(self, buf1=bytearray(1)):
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if self._asyn:
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if self._as_busy:
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raise RuntimeError('Cannot refresh: display is busy.')
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self._as_busy = True # Immediate busy flag. Pin goes low much later.
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asyncio.create_task(self._as_show())
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return
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# t = ticks_us()
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mvb = self._mvb
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cmd = self._command
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dat = self._data
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# DATA_START_TRANSMISSION_2 Datasheet P31 indicates this sets
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# busy pin low (True) and that it stays logically True until
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# refresh is complete. Probably don't need _as_busy TODO
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# refresh is complete. In my testing this doesn't happen.
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cmd(b'\x13')
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if self._lsc: # Landscape mode
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wid = self.width
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tbc = self.height // 8 # Vertical bytes per column
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iidx = wid * (tbc - 1) # Initial index
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idx = iidx # Index into framebuf
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vbc = 0 # Current vertical byte count
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hpc = 0 # Horizontal pixel count
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for _ in range(len(mvb)):
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buf1[0] = mvb[idx] ^ 0xff
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self._data(buf1)
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idx -= self.width
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vbc += 1
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vbc %= tbc
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if not vbc:
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hpc += 1
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idx = iidx + hpc
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else:
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self._data(self._buffer) # TODO if this works don't need ._mvb
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wid = self.width
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tbc = self.height // 8 # Vertical bytes per column
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iidx = wid * (tbc - 1) # Initial index
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idx = iidx # Index into framebuf
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vbc = 0 # Current vertical byte count
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hpc = 0 # Horizontal pixel count
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for _ in range(len(mvb)):
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buf1[0] = mvb[idx] ^ 0xff
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dat(buf1)
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idx -= wid
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vbc += 1
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vbc %= tbc
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if not vbc:
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hpc += 1
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idx = iidx + hpc
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cmd(b'\x11') # Data stop
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sleep_us(20) # Allow for data coming back: currently ignore this
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# Datasheet P14 is ambiguous over whether a refresh command is necessary here TODO
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cmd(b'\x12') # DISPLAY_REFRESH
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te = ticks_us()
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print('show time', ticks_diff(te, t)//1000, 'ms')
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# 258ms to get here on Pyboard D
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# Checking with scope, busy goes low now. For 4.9s.
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# te = ticks_us()
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# print('show time', ticks_diff(te, t)//1000, 'ms')
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if not self.demo_mode:
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# Immediate return to avoid blocking the whole application.
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# User should wait for ready before calling refresh()
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@ -0,0 +1,119 @@
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# epd29_test.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 False, asyn True and must not set demo_mode
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import uasyncio as asyncio
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from color_setup import ssd
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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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# Fonts
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import gui.fonts.arial10 as arial10
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#import gui.fonts.courier20 as fixed
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import gui.fonts.font6 as small
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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 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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textfield = Label(wri, 0, 2, wri.stringlen('longer'))
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numfield = Label(wri, 25, 2, wri.stringlen('99.990'), bdcolor=None)
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countfield = Label(wri, 0, 60, wri.stringlen('1'))
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n = 1
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random = xorshift64star(65535)
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while True:
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for s in ('short', 'longer', '1', ''):
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textfield.value(s)
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numfield.value('{:5.2f}'.format(random() /1000))
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countfield.value('{:1d}'.format(n))
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n += 1
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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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row = 10
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col = 150
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m0 = Meter(wri, row, col, height = 80, width = 15, divisions = 4, legends=('0.0', '0.5', '1.0'))
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m1 = Meter(wri, row, col + 50, height = 80, width = 15, divisions = 4, legends=('-1', '0', '+1'))
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m2 = Meter(wri, row, col + 100, height = 80, width = 15, divisions = 4, legends=('-1', '0', '+1'))
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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(fields(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(20) # 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.wait_until_ready() # Synchronous code
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finally:
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_ = asyncio.new_event_loop()
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