157 lines
5 KiB
Python
157 lines
5 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2018 Dean Miller for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`adafruit_epd.epd` - Adafruit EPD - ePaper display driver
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====================================================================================
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CircuitPython driver for Adafruit ePaper display breakouts
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* Author(s): Dean Miller
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"""
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import time
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from adafruit_epd import mcp_sram
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import digitalio
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class Adafruit_EPD(object):
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"""Base class for EPD displays
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"""
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BLACK = 0
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WHITE = 1
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INVERSE = 2
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RED = 3
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DARK = 4
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LIGHT = 5
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# pylint: disable=too-many-arguments
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def __init__(self, width, height, rst_pin, dc_pin, busy_pin, srcs_pin, cs_pin, spi):
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self.width = width
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self.height = height
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# Setup reset pin.
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self._rst = rst_pin
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self._rst.direction = digitalio.Direction.OUTPUT
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# Setup busy pin.
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self._busy = busy_pin
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self._busy.direction = digitalio.Direction.INPUT
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# Setup dc pin.
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self._dc = dc_pin
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self._dc.direction = digitalio.Direction.OUTPUT
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# Setup cs pin.
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self._cs = cs_pin
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self._cs.direction = digitalio.Direction.OUTPUT
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self.spi_device = spi
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self.sram = mcp_sram.Adafruit_MCP_SRAM(srcs_pin, spi)
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# pylint: enable=too-many-arguments
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def begin(self, reset=True):
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"""Begin display and reset if desired."""
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self._cs.value = True
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self._dc.value = False
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if reset:
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self._rst.value = False
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time.sleep(.1)
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self._rst.value = True
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time.sleep(.1)
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def command(self, cmd, data=None, end=True):
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"""Send command byte to display."""
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self._cs.value = True
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self._dc.value = False
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self._cs.value = False
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outbuf = bytearray(1)
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while not self.spi_device.try_lock():
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pass
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self.spi_device.write_readinto(bytearray([cmd]), outbuf)
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if data is not None:
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self.data(data)
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elif end:
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self._cs.value = True
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self.spi_device.unlock()
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return outbuf[0]
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def data(self, dat):
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"""Send data to display."""
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self._dc.value = True
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self.spi_device.write(dat)
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self._cs.value = True
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self.spi_device.unlock()
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def draw_pixel(self, x, y, color):
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"""This should be overridden in the subclass"""
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pass
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#framebuf methods
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def fill(self, color):
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"""fill the screen with the passed color"""
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self.fill_rect(0, 0, self.width, self.height, color)
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# pylint: disable=too-many-arguments
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def fill_rect(self, x, y, width, height, color):
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"""fill a rectangle with the passed color"""
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if width < 1 or height < 1 or (x+width) <= 0:
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return
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if (y+height) <= 0 or y >= self.height or x >= self.width:
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return
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xend = min(self.width, x+width)
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yend = min(self.height, y+height)
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x = max(x, 0)
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y = max(y, 0)
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for _x in range(xend - x):
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for _y in range(yend - y):
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self.draw_pixel(x + _x, y + _y, color)
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return
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def pixel(self, x, y, color=None):
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"""draw a pixel"""
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if x < 0 or x >= self.width or y < 0 or y >= self.height:
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return None
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#TODO: figure this out when we know what framebuffer we
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# will actually use
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#if color is None:
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# return self.get_pixel(self, x, y)
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self.draw_pixel(x, y, color)
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return None
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def hline(self, x, y, width, color):
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"""draw a horizontal line"""
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self.fill_rect(x, y, width, 1, color)
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def vline(self, x, y, height, color):
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"""draw a vertical line"""
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self.fill_rect(x, y, 1, height, color)
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def rect(self, x, y, width, height, color):
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"""draw a rectangle"""
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self.fill_rect(x, y, width, 1, color)
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self.fill_rect(x, y+height, width, 1, color)
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self.fill_rect(x, y, 1, height, color)
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self.fill_rect(x+width, y, 1, height, color)
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