物联网开发笔记（85）- 使用Micropython开发ESP32开发板之通过I2C控制0

ESP32 + Thonny + 0.91寸 OLED显示液晶屏模块 + 几根杜邦线 + Win10

接线方法：

三、SSD306 oled驱动代码

SSD306 oled驱动:

# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
 
from micropython import const
import framebuf
 
 
# register definitions
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)
 
# Subclassing FrameBuffer provides support for graphics primitives
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
class SSD1306(framebuf.FrameBuffer):
    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)
        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
        self.init_display()
 
    def init_display(self):
        for cmd in (
            SET_DISP | 0x00,  # off
            # address setting
            SET_MEM_ADDR,
            0x00,  # horizontal
            # resolution and layout
            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.width > 2 * self.height else 0x12,
            # timing and driving scheme
            SET_DISP_CLK_DIV,
            0x80,
            SET_PRECHARGE,
            0x22 if self.external_vcc else 0xF1,
            SET_VCOM_DESEL,
            0x30,  # 0.83*Vcc
            # display
            SET_CONTRAST,
            0xFF,  # maximum
            SET_ENTIRE_ON,  # output follows RAM contents
            SET_NORM_INV,  # not inverted
            # charge pump
            SET_CHARGE_PUMP,
            0x10 if self.external_vcc else 0x14,
            SET_DISP | 0x01,
        ):  # on
            self.write_cmd(cmd)
        self.fill(0)
        self.show()
 
    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:
            # displays with width of 64 pixels are shifted by 32
            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)
 
 
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)
        self.write_list = [b"\x40", None]  # Co=0, D/C#=1
        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.write_list[1] = buf
        self.i2c.writevto(self.addr, self.write_list)
 
 
class SSD1306_SPI(SSD1306):
    def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
        self.rate = 10 * 1024 * 1024
        dc.init(dc.OUT, value=0)
        res.init(res.OUT, value=0)
        cs.init(cs.OUT, value=1)
        self.spi = spi
        self.dc = dc
        self.res = res
        self.cs = cs
        import time
 
        self.res(1)
        time.sleep_ms(1)
        self.res(0)
        time.sleep_ms(10)
        self.res(1)
        super().__init__(width, height, external_vcc)
 
    def write_cmd(self, cmd):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(0)
        self.cs(0)
        self.spi.write(bytearray([cmd]))
        self.cs(1)
 
    def write_data(self, buf):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(buf)
        self.cs(1)

四、演示代码

提前使用取模软件PCtoLCD2002.exe，获得“元旦快乐”四个汉字的字模。使用方法大家百度下，或者看我前面文章，也有介绍。

软件下载地址：

链接: https://pan.baidu.com/s/1mHZANIGNZ1a67Plv31_eFQ 提取码: srkp

from machine import Pin,I2C
from ssd1306 import SSD1306_I2C
import time

addr = 0x3c
i2c = I2C(0,scl = Pin(15),sda = Pin(4),freq = 1_000_000)
oled = SSD1306_I2C(128,32,i2c,addr)
#print(hex(i2c.scan()[0]))

class Chine:
    chine = [
                0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,
                0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x18,0x10,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x00,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x90,0xF0,0x30,0x10,0x10,
                0x10,0x10,0xF0,0xF0,0x10,0x10,0x10,0x10,0x10,0x10,0x18,0x18,0x10,0x00,0x00,0x00,
                
                0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF0,0x7F,0x0F,0x00,0x00,0x00,
                0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0x00,0x00,0x00,
                0x00,0x00,0x40,0x20,0x20,0x10,0x18,0x0C,0x06,0x03,0x01,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x0F,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1C,0x1F,0x0C,0x00,0x00,#元,0#

                0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0xE0,0x20,0x20,0x20,0x20,0x20,0x20,
                0x20,0x20,0x20,0x20,0x20,0x20,0xE0,0xF0,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x20,0x20,0x20,0x20,0x20,0x20,
                0x20,0x20,0x20,0x20,0x20,0x20,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x20,0x20,0x20,0x20,0x20,0x20,
                0x20,0x20,0x20,0x20,0x20,0x20,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x10,0x10,0x10,0x10,0x10,0x10,0x11,0x10,0x10,0x10,0x10,0x10,0x10,0x10,
                0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x18,0x1C,0x18,0x10,0x00,0x00,#旦,1#

                0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0xFC,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0xC0,0xF0,0x30,0x00,0xFF,0xFF,0x02,0x04,0x1C,0x38,0x01,0x01,0x01,0x01,
                0x01,0xFF,0xFF,0x01,0x01,0x01,0x01,0x01,0x01,0xFF,0xFF,0x01,0x00,0x00,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x00,0x00,0x02,0x02,0x02,0x02,0x02,0x82,
                0xF2,0x3F,0x07,0x02,0x1E,0xE2,0x82,0x02,0x02,0x03,0x03,0x02,0x03,0x02,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x3F,0x00,0x40,0x20,0x10,0x18,0x0C,0x06,0x03,
                0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x0E,0x1C,0x38,0x70,0x30,0x10,0x00,0x00,#快,2#

                0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0xC0,0x40,0x40,0x40,0x40,0x40,0x20,0x20,
                0x20,0x20,0x20,0x20,0x30,0x30,0x30,0x18,0x18,0x10,0x00,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x80,0xFC,0xFF,0x81,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
                0xFF,0xFF,0x82,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0xC0,0xC0,0x80,0x00,0x00,0x00,
                0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x80,0xC0,0x60,0x38,0x18,0x10,0x00,0x00,0x00,
                0xFF,0xFF,0x00,0x00,0x00,0x08,0x10,0x20,0xE0,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,
                0x00,0x00,0x10,0x08,0x04,0x06,0x03,0x01,0x00,0x00,0x00,0x08,0x10,0x10,0x30,0x70,
                0x3F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x0F,0x0F,0x00,0x00,0x00,0x00,#乐,3#
        ]
    
# 16x16汉字显示函数
def ByteOpera16x16(num,dat):
  byte= [0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80]
  if dat&byte[num]:
    return 1
  else:
    return 0

def LcdShowCh_16x16(n, x_axis, y_axis):
  for i in range(2): 
    for a in range(16): 
      for b in range(8):
        if(ByteOpera16x16(b,Chine.chine[n*32+i*16+a])): 
          oled.pixel(x_axis+a,y_axis+i*8+b,1)
        else:
          oled.pixel(x_axis+a,y_axis+i*8+b,0)
          
# 32x32汉字显示函数        
def ByteOpera16x16(num,dat):
  byte= [0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80]
  if dat&byte[num]:
    return 1
  else:
    return 0