ESP32（MicroPython）MAX7219点阵屏随机显示

ESP32（MicroPython）MAX7219点阵屏随机显示

本次发布程序包括在MAX7219点阵屏随机显示点（分低速刷新和高速刷新）、矩形、填充矩形和线段。实测在每次显示不会保留之前显示的内容，因此程序刷新内容时不用另外使用指令进行清屏。代码中注释部分表示另一种可用的代码。

随机显示点

import max7219

from machine import Pin, SPI

import time

import random

spi = SPI(1, baudrate=10000000, polarity=1, phase=0, sck=Pin(2), mosi=Pin(0))

ss = Pin(4, Pin.OUT)

while True:

    display = max7219.Matrix8x8(spi, ss, 1)

    x=random.randint(0,7)

    y=random.randint(0,7)

    display.pixel(x,y,1)

    display.show()

    #time.sleep(0.1)

    time.sleep(0.005)

随机显示矩形

import max7219

from machine import Pin, SPI

import time

import random

spi = SPI(1, baudrate=10000000, polarity=1, phase=0, sck=Pin(2), mosi=Pin(0))

ss = Pin(4, Pin.OUT)

while True:

    display = max7219.Matrix8x8(spi, ss, 1)

    x=random.randint(0,5)

    y=random.randint(0,5)

    w=random.randint(2,5)

    h=random.randint(2,5)

    #display.rect(x,y,w,h,1)

    display.fill_rect(x,y,w,h,1)

    display.show()

    time.sleep(0.2)

随机显示线段

import max7219

from machine import Pin, SPI

import time

import random

spi = SPI(1, baudrate=10000000, polarity=1, phase=0, sck=Pin(2), mosi=Pin(0))

ss = Pin(4, Pin.OUT)

while True:

    display = max7219.Matrix8x8(spi, ss, 1)

    x1=random.randint(0,7)

    y1=random.randint(0,7)

    x2=random.randint(0,7)

    y2=random.randint(0,7)

    display.line(x1, y1,x2,y2, 1)

    display.show()

    time.sleep(0.2)

外设驱动

"""

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

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)

    def show(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)

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原文链接：https://blog.csdn.net/weixin_74155302/article/details/131351607