""" MicroPython max7219 cascadable 8x8 LED matrix driver https://github.com/mcauser/micropython-max7219 MIT License Copyright (c) 2017 Mike Causer Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation 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 furnished 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 FOR 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. """ from micropython import const # SREE from config import * import framebuf _NOOP = const(0) _DIGIT0 = const(1) _DECODEMODE = const(9) _INTENSITY = const(10) _SCANLIMIT = const(11) _SHUTDOWN = const(12) _DISPLAYTEST = const(15) class Matrix8x8: def __init__(self, spi, cs, num): """ Driver for cascading MAX7219 8x8 LED matrices. >>> import max7219 >>> from machine import Pin, SPI >>> spi = SPI(1) >>> display = max7219.Matrix8x8(spi, Pin('X5'), 4) >>> display.text('1234',0,0,1) >>> display.show() """ self.spi = spi self.cs = cs self.cs.init(cs.OUT, True) self.buffer = bytearray(8 * num) self.num = num fb = framebuf.FrameBuffer(self.buffer, 8 * num, 8, framebuf.MONO_HLSB) self.framebuf = fb # Provide methods for accessing FrameBuffer graphics primitives. This is a workround # because inheritance from a native class is currently unsupported. # http://docs.micropython.org/en/latest/pyboard/library/framebuf.html self.fill = fb.fill # (col) self.pixel = fb.pixel # (x, y[, c]) self.hline = fb.hline # (x, y, w, col) self.vline = fb.vline # (x, y, h, col) self.line = fb.line # (x1, y1, x2, y2, col) self.rect = fb.rect # (x, y, w, h, col) self.fill_rect = fb.fill_rect # (x, y, w, h, col) self.text = fb.text # (string, x, y, col=1) self.scroll = fb.scroll # (dx, dy) self.blit = fb.blit # (fbuf, x, y[, key]) self.init() def _write(self, command, data): self.cs(0) for m in range(self.num): self.spi.write(bytearray([command, data])) self.cs(1) def init(self): for command, data in ( (_SHUTDOWN, 0), (_DISPLAYTEST, 0), (_SCANLIMIT, 7), (_DECODEMODE, 0), (_SHUTDOWN, 1), ): self._write(command, data) def brightness(self, value): if not 0 <= value <= 15: raise ValueError("Brightness out of range") self._write(_INTENSITY, value) # SREE def show(self): if FLIP_DISPLAY: self.show_flipped() else: self.show_normal() # SREE - OLD SHOW def show_normal(self): for y in range(8): self.cs(0) for m in range(self.num): self.spi.write(bytearray([_DIGIT0 + y, self.buffer[(y * self.num) + m]])) self.cs(1) #SREE def show_flipped(self): for y in range(8): self.cs(0) for m in range(self.num): #reversed_byte = self.reverse_bits(self.buffer[(y * self.num) + m]) byte = self.buffer[(y * self.num) + m] byte = ((byte & 0xF0) >> 4) | ((byte & 0x0F) << 4) byte = ((byte & 0xCC) >> 2) | ((byte & 0x33) << 2) byte = ((byte & 0xAA) >> 1) | ((byte & 0x55) << 1) self.spi.write(bytearray([_DIGIT0 + y, byte])) self.cs(1) #ABHI def set_pixel(self, x, y, value): """ Set the value of a specific pixel at coordinates (x, y). :param x: X-coordinate (0-7) :param y: Y-coordinate (0-7) :param value: 0 for off, 1 for on """ # 8 * num if 0 <= x < 8 * 4 and 0 <= y < 8: self.framebuf.pixel(x, y, value) # Example of how to use the set_pixel function: # display = Matrix8x8(spi, Pin('X5'), 4) # display.set_pixel(2, 3, 1) # Turn on the LED at (2, 3) # display.show()