micropython-nano-gui/drivers/epaper/pico_epaper_42.py

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Python
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# pico_epaper_42.py A 1-bit monochrome display driver for the Waveshare Pico
# ePaper 4.2" display. This version fixes bugs and supports partial updates.
# https://github.com/peterhinch/micropython-nano-gui/blob/master/drivers/epaper/pico_epaper_42.py
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# Adapted from the Waveshare driver by Peter Hinch Sept 2022-March 2023.
# https://www.waveshare.com/pico-epaper-4.2.htm
# UC8176 manual https://www.waveshare.com/w/upload/8/88/UC8176.pdf
# Waveshare's copy of this driver.
# https://github.com/waveshare/Pico_ePaper_Code/blob/main/pythonNanoGui/drivers/ePaper4in2.py
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# *****************************************************************************
# * | File : Pico_ePaper-3.7.py
# * | Author : Waveshare team
# * | Function : Electronic paper driver
# * | Info :
# *----------------
# * | This version: V1.0
# * | Date : 2021-06-01
# # | Info : python demo
# -----------------------------------------------------------------------------
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documnetation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# If .set_partial() is called, subsequent updates will be partial. To restore normal
# updates, issue .set_full()
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from machine import Pin, SPI
import framebuf
import time
import uasyncio as asyncio
from drivers.boolpalette import BoolPalette
# Display resolution
_EPD_WIDTH = const(400)
_BWIDTH = _EPD_WIDTH // 8
_EPD_HEIGHT = const(300)
RST_PIN = 12
DC_PIN = 8
CS_PIN = 9
BUSY_PIN = 13
EPD_lut_vcom0 = b"\x00\x08\x08\x00\x00\x02\x00\x0F\x0F\x00\x00\x01\x00\x08\x08\x00\
\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00"
EPD_lut_ww = b"\x50\x08\x08\x00\x00\x02\x90\x0F\x0F\x00\x00\x01\xA0\x08\x08\x00\x00\x02\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
EPD_lut_bw = b"\x50\x08\x08\x00\x00\x02\x90\x0F\x0F\x00\x00\x01\xA0\x08\x08\x00\x00\x02\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
EPD_lut_wb = b"\xA0\x08\x08\x00\x00\x02\x90\x0F\x0F\x00\x00\x01\x50\x08\x08\x00\x00\x02\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
EPD_lut_bb = b"\x20\x08\x08\x00\x00\x02\x90\x0F\x0F\x00\x00\x01\x10\x08\x08\x00\x00\x02\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# ******************************partial screen update LUT********************************* #
EPD_partial_lut_vcom1 = b"\x00\x19\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00"
EPD_partial_lut_ww1 = b"\x00\x19\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00"
EPD_partial_lut_bw1 =b"\x80\x19\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00"
EPD_partial_lut_wb1 = b"\x40\x19\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00"
EPD_partial_lut_bb1 = b"\x00\x19\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
\x00\x00\x00\x00"
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class EPD(framebuf.FrameBuffer):
# A monochrome approach should be used for coding this. The rgb method ensures
# nothing breaks if users specify colors.
@staticmethod
def rgb(r, g, b):
return int((r > 127) or (g > 127) or (b > 127))
def __init__(self, spi=None, cs=None, dc=None, rst=None, busy=None, asyn=False):
self.reset_pin = Pin(RST_PIN, Pin.OUT) if rst is None else rst
self.busy_pin = Pin(BUSY_PIN, Pin.IN, Pin.PULL_UP) if busy is None else busy
self.cs_pin = Pin(CS_PIN, Pin.OUT) if cs is None else cs
self.dc_pin = Pin(DC_PIN, Pin.OUT) if dc is None else dc
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self.spi = SPI(1, sck = Pin(10), mosi = Pin(11), miso = Pin(28)) if spi is None else spi
self.spi.init(baudrate = 4_000_000)
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self._asyn = asyn
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self._busy = False # Set immediately on .show(). Cleared when busy pin is logically false (physically 1).
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self._updated = asyncio.Event()
self.width = _EPD_WIDTH
self.height = _EPD_HEIGHT
self.buf = bytearray(_EPD_HEIGHT * _BWIDTH)
self.mvb = memoryview(self.buf)
mode = framebuf.MONO_HLSB
self.palette = BoolPalette(mode)
super().__init__(self.buf, _EPD_WIDTH, _EPD_HEIGHT, mode)
self.init()
time.sleep_ms(500)
# Hardware reset
def reset(self):
for v in (1, 0, 1):
self.reset_pin(v)
time.sleep_ms(20)
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def send_command(self, command):
self.dc_pin(0)
self.cs_pin(0)
self.spi.write(command)
self.cs_pin(1)
def send_bytes(self, data):
self.dc_pin(1)
self.cs_pin(0)
self.spi.write(data)
self.cs_pin(1)
def display_on(self):
self.send_command(b"\x12")
time.sleep_ms(100)
self.wait_until_ready()
def init(self):
self.reset()
self.send_command(b"\x01") # POWER SETTING
self.send_bytes(b"\x03")
self.send_bytes(b"\x00")
self.send_bytes(b"\x2b")
self.send_bytes(b"\x2b")
self.send_command(b"\x06") # boost soft start
self.send_bytes(b"\x17") # A
self.send_bytes(b"\x17") # B
self.send_bytes(b"\x17") # C
self.send_command(b"\x04") # POWER_ON
self.wait_until_ready()
self.send_command(b"\x00") # panel setting
self.send_bytes(b"\xbf") # KW-BF KWR-AF BWROTP 0f BWOTP 1f
self.send_bytes(b"\x0d")
self.send_command(b"\x30") # PLL setting
self.send_bytes(b"\x3C") # 3A 100HZ 29 150Hz 39 200HZ 31 171HZ
self.send_command(b"\x61") # resolution setting
self.send_bytes(b"\x01")
self.send_bytes(b"\x90") # 128
self.send_bytes(b"\x01")
self.send_bytes(b"\x2c")
self.send_command(b"\x82") # vcom_DC setting
self.send_bytes(b"\x28")
self.send_command(b"\x50") # VCOM AND DATA INTERVAL SETTING
self.send_bytes(b"\x97") # 97white border 77black border VBDF 17|D7 VBDW 97 VBDB 57 VBDF F7 VBDW 77 VBDB 37 VBDR B7
self.set_full()
# Clear display
self.send_command(b"\x10")
for j in range(_EPD_HEIGHT):
self.send_bytes(b"\xff" * _BWIDTH)
self.send_command(b"\x13")
for j in range(_EPD_HEIGHT):
self.send_bytes(b"\xff" * _BWIDTH)
self.send_command(b"\x12")
time.sleep_ms(10)
self.display_on()
def set_full(self): # Normal full updates
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self.send_command(b"\x20")
self.send_bytes(EPD_lut_vcom0)
self.send_command(b"\x21")
self.send_bytes(EPD_lut_ww)
self.send_command(b"\x22")
self.send_bytes(EPD_lut_bw)
self.send_command(b"\x23")
self.send_bytes(EPD_lut_wb)
self.send_command(b"\x24")
self.send_bytes(EPD_lut_bb)
def set_partial(self): # Partial updates
self.send_command(b"\x20")
self.send_bytes(EPD_partial_lut_vcom1)
self.send_command(b"\x21")
self.send_bytes(EPD_partial_lut_ww1)
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self.send_command(b"\x22")
self.send_bytes(EPD_partial_lut_bw1)
self.send_command(b"\x23")
self.send_bytes(EPD_partial_lut_wb1)
self.send_command(b"\x24")
self.send_bytes(EPD_partial_lut_bb1)
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def wait_until_ready(self):
while not self.ready():
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time.sleep_ms(100)
async def wait(self):
while not self.ready():
await asyncio.sleep_ms(100)
# Pause until framebuf has been copied to device.
async def updated(self):
self._updated.clear()
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await self._updated.wait()
self._updated.clear()
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# For polling in asynchronous code. Just checks pin state.
# 0 == busy. Comment in official code is wrong. Code is correct.
def ready(self):
return not (self._busy or (self.busy_pin() == 0)) # 0 == busy
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def _line(self, n, buf=bytearray(_BWIDTH)):
img = self.mvb
s = n * _BWIDTH
for x, b in enumerate(img[s : s + _BWIDTH]):
buf[x] = b ^ 0xFF
self.send_bytes(buf)
async def _as_show(self):
self.send_command(b"\x13")
for j in range(_EPD_HEIGHT): # Loop would block ~300ms
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self._line(j)
await asyncio.sleep_ms(0)
self._updated.set()
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self.send_command(b"\x12") # Async .display_on()
while not self.busy_pin():
await asyncio.sleep_ms(10) # About 1.7s
self._busy = False
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def show(self):
if self._busy:
raise RuntimeError('Cannot refresh: display is busy.')
self._busy = True # Immediate busy flag. Pin goes low much later.
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if self._asyn:
asyncio.create_task(self._as_show())
return
self.send_command(b"\x13")
for j in range(_EPD_HEIGHT):
self._line(j)
self._busy = False
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self.display_on()
self.wait_until_ready()
def sleep(self):
# self.send_command(b"\x02") # power off
# self.wait_until_ready()
self.send_command(b"\x07") # deep sleep
self.send_bytes(b"\xA5")