简 介： 在测试了MicroPython对于OLED驱动的基础上，本文给出了将普通的视频转换成OLED可以显示的动画的过程。利用在SD卡中存储的文件，可以将大量视频过程进行播放。在实际过程中，由于MicroPython在读取数据过程中速度比较缓慢，因此在显示动画的动态特性中还不够流畅。

关键词： OLED，MM32，GIF

§01 I2C OLED

一、MM32F3277 MicroPython

  具有I2C接口 OLED接入MCU非常简单。只需要两根信号线便可以。在 MindMotion MM32F3277 SoftI2C功能测试 测试了OLED通过I2C接入MM32F3277 的 SoftI2C控制端口，通过MicroPython显示字符信息。

1、OLED显示图片

  OLED显示像素为128×64，总共有1024个字节的数据表示显示的图片。每个像素只有两个状态，所以只能显示图片的边缘信息。

  在显示图片之前需要将图片转换成边缘信息。

二、转换图片

  对于显示的图片转换包括有两个过程：

• 将图片转换成给出边缘图片；
• 将图片的尺寸切割成128×64；

  转换完之后，便可以将其编码成1024 个字节，传送到MicroPython刷新到OLED中，或者将数据存储在文件中，预先存储在SD卡中，由MicroPython读取显示。

1、提取边缘

  使用cv2中的Canny算子提取图片中的边缘。

filename = os.path.join(gifdir, '%04d.BMP'%i)
img = cv2.imread(filename)[:,:,::-1]
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
edge = cv2.Canny(gray, 100, 200)

  

 

  
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2、提取中心256×128图片

imgshape = shape(img)
imgcrop = img[imgshape[0]//2-64:imgshape[0]//2+64,
              0:255,:]

  

 

  
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3、图片压缩到128×64

imgcrop = cv2.resize(imgcrop, dsize=(128, 64), interpolation=cv2.INTER_LINEAR)

  

 

  
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4、转换成字节

  根据【1.1.1：OLED显示图片】中的OLED的数据编码方式，将边缘图片转换成1024个字节。

def oleddata(d):
    outd = []

    d[d!=0] = 1

    h,w = shape(d)
    line = h//8
    c12 = [2**i for i in range(8)]
    printf(sum(d))

    for i in range(line):
        startline = i*8
        endline = startline+8
        for j in range(w):
            data = d[startline:endline, j]
            printf(data)
            num = sum([x*y for x,y in zip(data, c12)])
            outd.append(num)

   return outd

  

 

  
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  下面是其中衣服图片转换后的字节。

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 224, 56, 12, 6, 3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 3, 4, 9, 11, 18, 50, 18, 4, 84, 84, 148, 20, 20, 36, 32, 40, 40, 40, 40, 40, 72, 64, 80, 208, 16, 224, 16, 80, 80, 80, 80, 80, 64, 15, 136, 143, 129, 129, 129, 2, 65, 129, 129, 128, 128, 128, 0, 0, 0, 0, 15, 0, 15, 16, 31, 16, 31, 0, 4, 7, 0, 255, 0, 176, 31, 16, 16, 31, 16, 16, 7, 4, 248, 0, 0, 0, 248, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 124, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 6, 28, 112, 192, 0, 0, 0, 0, 0, 0, 0, 255, 0, 254, 0, 2, 1, 13, 35, 221, 0, 129, 126, 0, 20, 58, 3, 1, 1, 238, 50, 14, 112, 216, 73, 197, 89, 17, 225, 2, 2, 254, 1, 2, 2, 252, 4, 8, 8, 9, 9, 1, 248, 8, 8, 8, 224, 32, 32, 32, 33, 33, 33, 33, 33, 32, 96, 64, 64, 64, 64, 0, 0, 0, 0, 0, 0, 0, 248, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 7, 124, 0, 0, 192, 96, 32, 223, 64, 255, 0, 128, 238, 138, 136, 255, 138, 139, 170, 168, 138, 250, 128, 128, 128, 179, 8, 8, 8, 11, 8, 8, 57, 192, 15, 0, 254, 1, 0, 0, 196, 187, 0, 0, 0, 0, 0, 0, 255, 0, 28, 226, 1, 251, 134, 48, 80, 136, 136, 64, 112, 24, 8, 8, 24, 160, 32, 0, 0, 0, 0, 0, 0, 192, 103, 56, 80, 80, 48, 32, 64, 192, 160, 160, 64, 64, 64, 128, 0, 0, 128, 192, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 18, 18, 11, 73, 152, 113, 134, 56, 136, 56, 64, 80, 160, 50, 24, 14, 16, 56, 32, 68, 52, 36, 201, 121, 130, 113, 27, 17, 255, 128, 30, 0, 255, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 255, 0, 1, 246, 8, 161, 48, 28, 7, 1, 128, 128, 128, 128, 143, 137, 153, 180, 161, 128, 128, 128, 128, 128, 143, 240, 0, 0, 248, 136, 134, 132, 254, 64, 64, 1, 3, 6, 4, 4, 73, 99, 22, 36, 104, 72, 80, 144, 160, 64, 64, 128, 128, 0, 0, 0, 0, 3, 2, 2, 2, 2, 98, 178, 20, 36, 100, 132, 4, 12, 8, 216, 48, 0, 192, 120, 72, 68, 244, 146, 210, 2, 168, 41, 43, 2, 36, 38, 34, 34, 39, 44, 51, 32, 21, 38, 37, 36, 36, 208, 80, 156, 167, 160, 160, 160, 76, 48, 13, 9, 139, 46, 32, 32, 31, 32, 255, 0, 0, 0, 1, 254, 0, 0, 0, 0, 192, 120, 7, 128, 160, 119, 72, 73, 120, 74, 74, 105, 59, 72, 8, 248, 136, 122, 170, 8, 238, 194, 98, 58, 14, 0, 0, 0, 127, 192, 4, 8, 17, 16, 17, 30, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 2, 2, 4, 5, 8, 16, 240, 16, 252, 68, 36, 32, 48, 21, 28, 10, 65, 243, 10, 98, 31, 64, 143, 243, 140, 118, 131, 137, 133, 134, 0, 128, 195, 162, 12, 20, 20, 20, 20, 20, 20, 20, 36, 36, 36, 36, 36, 36, 36, 39, 32, 35, 36, 40, 40, 47, 36, 68, 68, 70, 85, 85, 85, 85, 87, 81, 87, 80, 80, 64, 160, 191, 160, 160, 160, 160, 161, 175, 136, 144, 144, 159, 144, 16, 80, 80, 80, 80, 86, 81, 81, 82, 84, 80, 93, 81, 17, 0, 0, 0, 0, 0, 0, 0, 0, 3, 14, 24, 112, 192, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 7, 4, 4, 4, 4, 64, 188, 6, 66, 59, 104, 78, 65, 0, 97, 142, 48, 14, 0, 32, 192, 112, 14, 225, 24, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 64, 64, 64, 64, 64, 192, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 12, 8, 24, 48, 96, 192, 0, 0, 0, 0, 0, 1, 6, 28, 112, 192, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 16, 16, 8, 15, 3, 2, 0, 0, 14, 176, 104, 15, 0, 0, 0, 0, 0, 255, 0, 128, 127, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 56, 44, 0, 184, 196, 114, 10, 57, 99, 193, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

  

 

  
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§02 显示图片

  编写MicroPython程序，将前面的数据显示在OLED中。

一、将数据写入文件

  将上述数据写入数据文件： GIF.TXT。

  然后将GIF.TXT 存入SD卡中。

pltgif = PlotGIF()
outfile = open(r'd:\temp\gif.txt', 'w')

#------------------------------------------------------------
for i in range(gifpage):

    filename = os.path.join(gifdir, '%04d.BMP'%i)
    printf(filename)
    img = cv2.imread(filename)[:,:,::-1]

    imgshape = shape(img)
    imgcrop = img[imgshape[0]//2-64:imgshape[0]//2+64,
                  0:255,:]

    imgcrop = cv2.resize(imgcrop, dsize=(128, 64), interpolation=cv2.INTER_LINEAR)
    gray = cv2.cvtColor(imgcrop, cv2.COLOR_BGR2GRAY)
    edge = cv2.Canny(gray, 80, 200)

    data = oleddata(edge)

    strdata = ''
    for d in data:
        strdata = strdata + '%02x'%d

    strdata = strdata + '\n'
    outfile.write(strdata)

  

 

  
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二、OLED显示

  在MicroPython通过读取GIF.TXT中的数据，显示在OLED上。

from machine                import SoftI2C,Pin
import utime
import i2coled

scl = Pin('PA0')
sda = Pin('PA1')

i2c = SoftI2C(scl, sda, freq=400000)

oled = i2coled.SSD1306_I2C(128, 64, i2c, addr=0x3c)
oled.setstring(0, 0, 'HELLO')
oled.show()

print("Receive OLED and show...")
count = 0

while True:
    count = 0
    with open('gif.txt', 'r') as f:
        for l in f:
            print(len(l))
            for i in range(1024):
                num = int(l[i*2:i*2+2], 16)
                oled.buffer[count] = num
                count += 1

            count = 0
            oled.show()

  

 

  
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※ 附  件 ※

  在测试了MicroPython对于OLED驱动的基础上，本文给出了将普通的视频转换成OLED可以显示的动画的过程。

  利用在SD卡中存储的文件，可以将大量视频过程进行播放。在实际过程中，由于MicroPython在读取数据过程中速度比较缓慢，因此在显示动画的动态特性中还不够流畅。

一、OLED程序

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# I2COLED.PY                   -- by Dr. ZhuoQing 2021-11-26
#
# Note:
#============================================================
from machine                import Pin,SoftI2C
from micropython import const
import utime
#------------------------------------------------------------
SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_DISP            = const(0xae)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)
font8x16 = bytes((0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,
  0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,
  0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,
  0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,
  0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,
  0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,
  0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,
  0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,
  0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,
  0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,
  0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,
  0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,
  0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,
  0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,
  0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,
  0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,
  0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,
  0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,
  0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,
  0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,
  0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,
  0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,
  0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,
  0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,
  0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,
  0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,
  0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,
  0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,
  0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,
  0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,
  0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,
  0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,
  0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,
  0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,
  0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,
  0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,
  0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,
  0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,
  0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,
  0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,
  0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,
  0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,
  0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,
  0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,
  0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,
  0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,
  0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,
  0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
  0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,
  0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,
  0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,
  0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,
  0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,
  0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,
  0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,
  0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,
  0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,
  0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,
  0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,
  0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,
  0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,
  0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,
  0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,
  0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,
  0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,
  0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,
  0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,
  0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,
  0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,
  0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,
  0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,
  0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00))
#------------------------------------------------------------
class SSD1306():
    def __init__(self, width, height, external_vcc):
        self.width = width
        self.height = height
        self.external_vcc = external_vcc
        self.pages = self.height // 8
        self.buffer = bytearray(self.pages * self.width)
        self.init_display()
    def init_display(self):
        for cmd in (
            SET_DISP | 0x00,            # off
            SET_MEM_ADDR, 0x00,         # horizontal
            SET_DISP_START_LINE | 0x00,
            SET_SEG_REMAP | 0x01,       # column addr 127 mapped to SEG0
            SET_MUX_RATIO, self.height - 1,
            SET_COM_OUT_DIR | 0x08,     # scan from COM[N] to COM0
            SET_DISP_OFFSET, 0x00,
            SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
            SET_DISP_CLK_DIV, 0x80,
            SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
            SET_VCOM_DESEL, 0x30,       # 0.83*Vcc
            SET_CONTRAST, 0xff,         # maximum
            SET_ENTIRE_ON,              # output follows RAM contents
            SET_NORM_INV,               # not inverted
            SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
            SET_DISP | 0x01):           # on
            self.write_cmd(cmd)
        self.fill(0x0)
        self.show()
    def fill(self, c):
        for i in range(len(self.buffer)):
            self.buffer[i] = c
    def poweroff(self):
        self.write_cmd(SET_DISP | 0x00)
    def poweron(self):
        self.write_cmd(SET_DISP | 0x01)
    def contrast(self, contrast):
        self.write_cmd(SET_CONTRAST)
        self.write_cmd(contrast)
    def invert(self, invert):
        self.write_cmd(SET_NORM_INV | (invert & 1))
    def show(self):
        x0 = 0
        x1 = self.width - 1
        if self.width == 64:
            x0 += 32
            x1 += 32
        self.write_cmd(SET_COL_ADDR)
        self.write_cmd(x0)
        self.write_cmd(x1)
        self.write_cmd(SET_PAGE_ADDR)
        self.write_cmd(0)
        self.write_cmd(self.pages - 1)
        self.write_data(self.buffer)
    def setpoint(self, x,y):
        liney = y//8
        yy = 1<<(y%8)
        self.buffer[liney*self.width+x] |= yy
    def setstring(self, x,y,str):
        for c in str:
            cid = ord(c) - 0x20
            cid *= 16
            for i in range(8):
                ii = y*self.width+x*8+i
                self.buffer[ii] = font8x16[cid+i]
                self.buffer[ii+self.width] = font8x16[cid+i+8]
            x += 1
            if x >= self.width//8:
                x = 0
                y += 1
class SSD1306_I2C(SSD1306):
    def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        super().__init__(width, height, external_vcc)
    def write_cmd(self, cmd):
        self.temp[0] = 0x80 # Co=1, D/C#=0
        self.temp[1] = cmd
        self.i2c.writeto(self.addr, self.temp)
    def write_data(self, buf):
        self.temp[0] = self.addr << 1
        self.temp[1] = 0x40         # Co=0, D/C#=1
        self.i2c.start()
        self.i2c.write(self.temp)
        self.i2c.write(buf)
        self.i2c.stop()
#------------------------------------------------------------
#        END OF FILE : I2COLED.PY
#============================================================

  

 

  
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二、测试程序

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST3.PY                     -- by Dr. ZhuoQing 2021-11-26
#
# Note:
#============================================================
from machine                import SoftI2C,Pin
import utime
import i2coled
#------------------------------------------------------------
scl = Pin('PA0')
sda = Pin('PA1')
i2c = SoftI2C(scl, sda, freq=400000)
#------------------------------------------------------------
oled = i2coled.SSD1306_I2C(128, 64, i2c, addr=0x3c)
#------------------------------------------------------------
oled.setstring(0, 0, '  MM32F3277')
oled.setstring(0, 2, 'MicroPython:V2')
oled.show()
print("Test OLED.")
count = 0
while True:
    oled.setstring(3, 6, 'Count:%04d'%count)
    count += 1
    oled.show()
    utime.sleep_ms(100)
#------------------------------------------------------------
#        END OF FILE : TEST3.PY
#============================================================

  

 

  
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三、将GIF转换成OLED数据

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST2.PY                     -- by Dr. ZhuoQing 2021-11-26
#
# Note:
#============================================================

from headm import *
import cv2
from tsmodule.tsstm32       import *

gifid = 17

#------------------------------------------------------------
giffile = tspgetdopfile(gifid)
gifpage = tspgetgifpage(gifid)

#printf(giffile, gifpage)
gifdir = os.path.dirname(giffile)
#printf(gifdir)

plt.draw()
plt.pause(.1)

#------------------------------------------------------------
def oleddata(d):
    outd = []

    d[d!=0] = 1

    h,w = shape(d)
    line = h//8
    c12 = [2**i for i in range(8)]
    printf(sum(d))

    for i in range(line):
        startline = i*8
        endline = startline+8
        for j in range(w):
            data = d[startline:endline, j]
#            printf(data)
            num = sum([x*y for x,y in zip(data, c12)])
            outd.append(num)


    return outd



#------------------------------------------------------------
pltgif = PlotGIF()
outfile = open(r'd:\temp\gif.txt', 'w')

#------------------------------------------------------------
for i in range(gifpage):

    filename = os.path.join(gifdir, '%04d.BMP'%i)
    printf(filename)
    img = cv2.imread(filename)[:,:,::-1]

    imgshape = shape(img)
    imgcrop = img[imgshape[0]//2-64:imgshape[0]//2+64,
                  0:255,:]

    imgcrop = cv2.resize(imgcrop, dsize=(128, 64), interpolation=cv2.INTER_LINEAR)
    gray = cv2.cvtColor(imgcrop, cv2.COLOR_BGR2GRAY)
    edge = cv2.Canny(gray, 80, 200)

    data = oleddata(edge)

    strdata = ''
    for d in data:
        strdata = strdata + '%02x'%d

    strdata = strdata + '\n'
    outfile.write(strdata)


    plt.clf()
    plt.subplot(121)
    plt.imshow(imgcrop)
    plt.subplot(122)
    plt.imshow(edge, cmap='gray')

    plt.draw()
    plt.pause(.1)
    pltgif.append(plt)


#    if i >= 10: break

#------------------------------------------------------------
pltgif.save()
outfile.close()





#------------------------------------------------------------
#        END OF FILE : TEST2.PY
#============================================================

  

 

  
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■ 相关文献链接:

• MindMotion MM32F3277 SoftI2C功能测试

● 相关图表链接:

• 图1.1.1 OLED通过I2C总线连接到MM32F3277
• 图1.1.2 OLED像素对应的1024字节编码
• 图1.2.1 提取边缘结果
• 图1.2.2 中心256×128图片
• 图1.2.3 转换成128×64点阵
• 图2.2.1 显示动画

文章来源: zhuoqing.blog.csdn.net，作者：卓晴，版权归原作者所有，如需转载，请联系作者。

原文链接：zhuoqing.blog.csdn.net/article/details/121559043