kopia lustrzana https://github.com/peterhinch/micropython-samples
123 wiersze
4.8 KiB
Python
123 wiersze
4.8 KiB
Python
# ssd1306_drv.py An implementation of a Display class for SSD1306 based displays
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# V0.1 Peter Hinch Nov 2016
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# https://learn.adafruit.com/monochrome-oled-breakouts/wiring-128x32-spi-oled-display
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# https://www.proto-pic.co.uk/monochrome-128x32-oled-graphic-display.html
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# Version supports vertical and "horizontal" modes.
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# The MIT License (MIT)
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#
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# Copyright (c) 2016 Peter Hinch
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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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# SSD1306 classes to fix the official one whose scroll method is broken
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# This also demonstrates a way to do scrolling for devices with true vertical
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# mapping (the official driver sets the device into its "horizontal" mode).
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# This is a hybrid mode where bytes are aligned vertically but arranged
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# horizontally
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import ssd1306
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class SSD1306(object):
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def __init__(self, device):
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self.width = device.width # In pixels
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self.height = device.height
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self.bpc = (self.height + 7) >> 3
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self.device = device
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self.vmap = False # Currently the official driver uses "horizontal"
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@property
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def buffer(self): # property emulates underlying device
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return self.device.buffer
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def show(self):
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self.device.show()
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# Return map-independent offset into buffer
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def _offset(self, x, y):
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if self.vmap:
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return y + x * self.bpc
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else:
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return y * self.width + x
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def scroll(self, x, y):
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dy = abs(y)
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if dy:
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self._scrolly(dy, y > 0)
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dx = abs(x)
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if dx:
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self._scrollx(dx, x > 0)
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def _scrolly(self, ystep, down):
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buf = self.device.buffer
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bpc = self.bpc
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ystep_bytes = (ystep >> 3) + 1
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ystep_bits = ystep & 7
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if down:
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for x in range(self.width):
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for ydest in range(bpc - 1, -1, -1):
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ysource = ydest - ystep_bytes
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data = 0
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if ysource + 1 >= 0:
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data = buf[self._offset(x, ysource + 1)] << ystep_bits
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if ysource >= 0:
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data |= buf[self._offset(x, ysource)] >> 8 - ystep_bits
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buf[self._offset(x, ydest)] = data
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else:
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for x in range(self.width):
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for ydest in range(bpc):
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ysource = ydest + ystep_bytes
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data = 0
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if ysource < bpc:
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data = buf[self._offset(x, ysource)] << (8-ystep_bits)
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if ysource - 1 < bpc:
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data |= buf[self._offset(x, ysource - 1)] >> ystep_bits
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buf[self._offset(x, ydest)] = data
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def _scrollx(self, xstep, right): # scroll x
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buf = self.device.buffer
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bpc = self.bpc
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for y in range(bpc):
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if right: # Scroll right
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for xdest in range(self.width - 1, -1, -1):
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data = 0
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xsource = xdest - xstep
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if xsource >= 0:
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data = buf[self._offset(xsource, y)]
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buf[self._offset(xdest, y)] = data
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else:
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for xdest in range(0, self.width):
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data = 0
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xsource = xdest + xstep
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if xsource < self.width:
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data = buf[self._offset(xsource, y)]
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buf[self._offset(xdest, y)] = data
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class SSD1306_I2C(SSD1306):
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def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
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device = ssd1306.SSD1306_I2C(width, height, i2c, addr, external_vcc)
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super().__init__(device)
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class SSD1306_SPI(SSD1306):
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def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
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device = ssd1306.SSD1306_SPI(width, height, spi, dc, res, cs, external_vcc)
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super().__init__(device)
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