385 lines
13 KiB
Python
385 lines
13 KiB
Python
# SPDX-FileCopyrightText: 2018 Dean Miller for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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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 micropython import const
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from digitalio import Direction
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from adafruit_epd import mcp_sram
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__version__ = "0.0.0+auto.0"
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__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_EPD.git"
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class Adafruit_EPD: # pylint: disable=too-many-instance-attributes, too-many-public-methods
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"""Base class for EPD displays"""
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BLACK = const(0)
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WHITE = const(1)
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INVERSE = const(2)
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RED = const(3)
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DARK = const(4)
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LIGHT = const(5)
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def __init__(
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self, width, height, spi, cs_pin, dc_pin, sramcs_pin, rst_pin, busy_pin
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): # pylint: disable=too-many-arguments
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self._width = width
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self._height = height
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# Setup reset pin, if we have one
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self._rst = rst_pin
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if rst_pin:
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self._rst.direction = Direction.OUTPUT
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# Setup busy pin, if we have one
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self._busy = busy_pin
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if busy_pin:
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self._busy.direction = Direction.INPUT
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# Setup dc pin (required)
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self._dc = dc_pin
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self._dc.direction = Direction.OUTPUT
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self._dc.value = False
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# Setup cs pin (required)
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self._cs = cs_pin
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self._cs.direction = Direction.OUTPUT
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self._cs.value = True
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# SPI interface (required)
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self.spi_device = spi
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while not self.spi_device.try_lock():
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time.sleep(0.01)
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self.spi_device.configure(baudrate=1000000) # 1 Mhz
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self.spi_device.unlock()
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self._spibuf = bytearray(1)
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self._single_byte_tx = False
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self.sram = None
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if sramcs_pin:
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self.sram = mcp_sram.Adafruit_MCP_SRAM(sramcs_pin, spi)
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self._buf = bytearray(3)
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self._buffer1_size = self._buffer2_size = 0
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self._buffer1 = self._buffer2 = None
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self._framebuf1 = self._framebuf2 = None
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self._colorframebuf = self._blackframebuf = None
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self._black_inverted = self._color_inverted = True
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self.hardware_reset()
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def display(self): # pylint: disable=too-many-branches
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"""show the contents of the display buffer"""
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self.power_up()
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self.set_ram_address(0, 0)
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if self.sram:
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while not self.spi_device.try_lock():
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time.sleep(0.01)
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self.sram.cs_pin.value = False
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# send read command
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self._buf[0] = mcp_sram.Adafruit_MCP_SRAM.SRAM_READ
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# send start address
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self._buf[1] = 0
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self._buf[2] = 0
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self.spi_device.write(self._buf, end=3)
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self.spi_device.unlock()
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# first data byte from SRAM will be transfered in at the
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# same time as the EPD command is transferred out
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databyte = self.write_ram(0)
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while not self.spi_device.try_lock():
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time.sleep(0.01)
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self._dc.value = True
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if self.sram:
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for _ in range(self._buffer1_size):
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databyte = self._spi_transfer(databyte)
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self.sram.cs_pin.value = True
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else:
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self._spi_transfer(self._buffer1)
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self._cs.value = True
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self.spi_device.unlock()
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time.sleep(0.002)
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if self.sram:
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while not self.spi_device.try_lock():
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time.sleep(0.01)
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self.sram.cs_pin.value = False
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# send read command
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self._buf[0] = mcp_sram.Adafruit_MCP_SRAM.SRAM_READ
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# send start address
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self._buf[1] = (self._buffer1_size >> 8) & 0xFF
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self._buf[2] = self._buffer1_size & 0xFF
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self.spi_device.write(self._buf, end=3)
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self.spi_device.unlock()
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if self._buffer2_size != 0:
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# first data byte from SRAM will be transfered in at the
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# same time as the EPD command is transferred out
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databyte = self.write_ram(1)
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while not self.spi_device.try_lock():
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time.sleep(0.01)
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self._dc.value = True
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if self.sram:
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for _ in range(self._buffer2_size):
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databyte = self._spi_transfer(databyte)
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self.sram.cs_pin.value = True
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else:
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self._spi_transfer(self._buffer2)
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self._cs.value = True
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self.spi_device.unlock()
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else:
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if self.sram:
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self.sram.cs_pin.value = True
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self.update()
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def hardware_reset(self):
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"""If we have a reset pin, do a hardware reset by toggling it"""
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if self._rst:
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self._rst.value = False
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time.sleep(0.1)
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self._rst.value = True
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time.sleep(0.1)
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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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while not self.spi_device.try_lock():
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time.sleep(0.01)
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ret = self._spi_transfer(cmd)
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if data is not None:
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self._dc.value = True
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self._spi_transfer(data)
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if end:
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self._cs.value = True
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self.spi_device.unlock()
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return ret
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def _spi_transfer(self, data):
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"""Transfer one byte or bytearray, toggling the cs pin if required by the EPD chipset"""
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if isinstance(data, int): # single byte!
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self._spibuf[0] = data
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# easy & fast case: array and no twiddling
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if not self._single_byte_tx and isinstance(data, bytearray):
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self.spi_device.write(data)
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return None
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# if its a single byte
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if isinstance(data, int): # single byte!
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if self._single_byte_tx:
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self._cs.value = False
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try:
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self.spi_device.write_readinto(self._spibuf, self._spibuf)
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except NotImplementedError:
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self.spi_device.write(self._spibuf)
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if self._single_byte_tx:
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self._cs.value = True
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return self._spibuf[0]
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if isinstance(data, bytearray):
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for x in data:
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self._spi_transfer(x)
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return None
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def power_up(self):
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"""Power up the display in preparation for writing RAM and updating.
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must be implemented in subclass"""
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raise NotImplementedError()
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def power_down(self):
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"""Power down the display, must be implemented in subclass"""
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raise NotImplementedError()
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def update(self):
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"""Update the display from internal memory, must be implemented in subclass"""
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raise NotImplementedError()
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def write_ram(self, index):
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"""Send the one byte command for starting the RAM write process. Returns
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the byte read at the same time over SPI. index is the RAM buffer, can be
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0 or 1 for tri-color displays. must be implemented in subclass"""
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raise NotImplementedError()
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def set_ram_address(self, x, y):
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"""Set the RAM address location, must be implemented in subclass"""
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raise NotImplementedError()
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def set_black_buffer(self, index, inverted):
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"""Set the index for the black buffer data (0 or 1) and whether its inverted"""
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if index == 0:
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self._blackframebuf = self._framebuf1
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elif index == 1:
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self._blackframebuf = self._framebuf2
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else:
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raise RuntimeError("Buffer index must be 0 or 1")
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self._black_inverted = inverted
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def set_color_buffer(self, index, inverted):
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"""Set the index for the color buffer data (0 or 1) and whether its inverted"""
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if index == 0:
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self._colorframebuf = self._framebuf1
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elif index == 1:
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self._colorframebuf = self._framebuf2
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else:
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raise RuntimeError("Buffer index must be 0 or 1")
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self._color_inverted = inverted
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def _color_dup(self, func, args, color):
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black = getattr(self._blackframebuf, func)
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red = getattr(self._colorframebuf, func)
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if self._blackframebuf is self._colorframebuf: # monochrome
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black(*args, color=(color != Adafruit_EPD.WHITE) != self._black_inverted)
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else:
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black(*args, color=(color == Adafruit_EPD.BLACK) != self._black_inverted)
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red(*args, color=(color == Adafruit_EPD.RED) != self._color_inverted)
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def pixel(self, x, y, color):
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"""draw a single pixel in the display buffer"""
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self._color_dup("pixel", (x, y), color)
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def fill(self, color):
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"""fill the screen with the passed color"""
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red_fill = ((color == Adafruit_EPD.RED) != self._color_inverted) * 0xFF
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black_fill = ((color == Adafruit_EPD.BLACK) != self._black_inverted) * 0xFF
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if self.sram:
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self.sram.erase(0x00, self._buffer1_size, black_fill)
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self.sram.erase(self._buffer1_size, self._buffer2_size, red_fill)
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else:
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self._blackframebuf.fill(black_fill)
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self._colorframebuf.fill(red_fill)
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def rect(self, x, y, width, height, color): # pylint: disable=too-many-arguments
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"""draw a rectangle"""
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self._color_dup("rect", (x, y, width, height), color)
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def fill_rect(
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self, x, y, width, height, color
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): # pylint: disable=too-many-arguments
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"""fill a rectangle with the passed color"""
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self._color_dup("fill_rect", (x, y, width, height), color)
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def line(self, x_0, y_0, x_1, y_1, color): # pylint: disable=too-many-arguments
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"""Draw a line from (x_0, y_0) to (x_1, y_1) in passed color"""
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self._color_dup("line", (x_0, y_0, x_1, y_1), color)
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def text(self, string, x, y, color, *, font_name="font5x8.bin", size=1):
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"""Write text string at location (x, y) in given color, using font file"""
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if self._blackframebuf is self._colorframebuf: # monochrome
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self._blackframebuf.text(
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string,
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x,
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y,
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font_name=font_name,
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size=size,
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color=(color != Adafruit_EPD.WHITE) != self._black_inverted,
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)
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else:
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self._blackframebuf.text(
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string,
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x,
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y,
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font_name=font_name,
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size=size,
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color=(color == Adafruit_EPD.BLACK) != self._black_inverted,
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)
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self._colorframebuf.text(
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string,
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x,
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y,
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font_name=font_name,
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size=size,
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color=(color == Adafruit_EPD.RED) != self._color_inverted,
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)
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@property
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def width(self):
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"""The width of the display, accounting for rotation"""
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if self.rotation in (0, 2):
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return self._width
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return self._height
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@property
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def height(self):
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"""The height of the display, accounting for rotation"""
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if self.rotation in (0, 2):
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return self._height
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return self._width
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@property
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def rotation(self):
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"""The rotation of the display, can be one of (0, 1, 2, 3)"""
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return self._framebuf1.rotation
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@rotation.setter
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def rotation(self, val):
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self._framebuf1.rotation = val
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if self._framebuf2:
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self._framebuf2.rotation = val
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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 image(self, image):
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"""Set buffer to value of Python Imaging Library image. The image should
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be in RGB mode and a size equal to the display size.
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"""
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imwidth, imheight = image.size
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if imwidth != self.width or imheight != self.height:
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raise ValueError(
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"Image must be same dimensions as display ({0}x{1}).".format(
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self.width, self.height
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)
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)
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if self.sram:
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raise RuntimeError("PIL image is not for use with SRAM assist")
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# Grab all the pixels from the image, faster than getpixel.
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pix = image.load()
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# clear out any display buffers
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self.fill(Adafruit_EPD.WHITE)
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if image.mode == "RGB": # RGB Mode
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for y in range(image.size[1]):
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for x in range(image.size[0]):
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pixel = pix[x, y]
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if (pixel[1] < 0x80 <= pixel[0]) and (pixel[2] < 0x80):
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# reddish
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self.pixel(x, y, Adafruit_EPD.RED)
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elif (pixel[0] < 0x80) and (pixel[1] < 0x80) and (pixel[2] < 0x80):
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# dark
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self.pixel(x, y, Adafruit_EPD.BLACK)
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elif image.mode == "L": # Grayscale
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for y in range(image.size[1]):
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for x in range(image.size[0]):
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pixel = pix[x, y]
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if pixel < 0x80:
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self.pixel(x, y, Adafruit_EPD.BLACK)
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else:
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raise ValueError("Image must be in mode RGB or mode L.")
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