MicroPython ESP32ssd1306驱动0.96“I2C屏幕汉字显示示例

Posted 2022-08-30 perseverance52

【MicroPython ESP32】ssd1306驱动0.96“I2C屏幕汉字显示示例

---

• 本示例基于Thonny平台开发。
• 效果演示
  

所需模块micropython-ssd1306模块

中文下载站：https://www.cnpython.com/pypi/micropython-ssd1306/download
官方下载站：https://pypi.org/project/micropython-ssd1306/

也可以不下载，将下面的代码拷贝下来，保存名为ssd1306.py,将文件保存到MicroPythonESP32设备上。

• ssd1306.py源码

# 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)

汉字取模说明

• 取模工具：pctolcd2002
• 取模方式：
  
• UTF-8字符编码转换网站：
• http://www.mytju.com/classcode/tools/encode_utf8.asp
  

主程序代码

from machine import Pin, I2C
from ssd1306 import SSD1306_I2C 

i2c = I2C(1,scl=Pin(22), sda=Pin(21),freq=100000)
OLED= SSD1306_I2C(128, 64, i2c, addr =0x3c)

#中文汉字.0xE5B58C 0xE585A5 0xE5BC8F 是 UTF-8字符编码转16进制
# 16X16点阵取模，阴码，行列式，顺向;
fonts= 
    0xE5B58C:
    [0x01,0x21,0x21,0x3F,0x00,0x22,0x22,0xFF,0x22,0x22,0x3E,0x22,0x22,0x3E,0x22,0x00,
     0x00,0x08,0x08,0xF8,0x20,0x20,0x3E,0x42,0x94,0x10,0x10,0x10,0x28,0x28,0x44,0x82],  # 嵌
    
    0xE585A5:
    [0x04,0x02,0x01,0x01,0x01,0x02,0x02,0x02,0x04,0x04,0x08,0x08,0x10,0x20,0x40,0x80,
     0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x40,0x40,0x20,0x20,0x10,0x10,0x08,0x06],  # 入
    
    0xE5BC8F:
    [0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x3E,0x08,0x08,0x08,0x08,0x0F,0x78,0x20,0x00,
     0x48,0x44,0x44,0x40,0xFE,0x40,0x40,0x40,0x40,0x40,0x20,0x22,0x12,0x0A,0x06,0x02],  # 式
    
    0xE5ADA6:
    [0x22,0x11,0x11,0x00,0x7F,0x40,0x80,0x1F,0x00,0x01,0xFF,0x01,0x01,0x01,0x05,0x02,
     0x08,0x08,0x10,0x20,0xFE,0x02,0x04,0xE0,0x40,0x80,0xFE,0x00,0x00,0x00,0x00,0x00],  # 学
    
    0xE4B9A0:
    [0x00,0x7F,0x00,0x00,0x08,0x04,0x02,0x02,0x00,0x01,0x0E,0x70,0x20,0x00,0x00,0x00,
     0x00,0xF8,0x08,0x08,0x08,0x08,0x08,0x08,0x68,0x88,0x08,0x08,0x08,0x08,0x50,0x20],  # 习
    



#汉字显示遍历
def chinese(ch_str, x_axis, y_axis): 
   offset_ = 0 
   for k in ch_str: 
       code = 0x00  # 将中文转成16进制编码 
       data_code = k.encode("utf-8")
       code |= data_code[0] << 16
       code |= data_code[1] << 8
       code |= data_code[2]
       byte_data = fonts[code]
       for y in range(0, 16):
           a_ = bin(byte_data[y]).replace('0b', '')
           while len(a_) < 8:
               a_ = '0'+ a_
           b_ = bin(byte_data[y+16]).replace('0b', '')
           while len(b_) < 8:
               b_ = '0'+ b_
           for x in range(0, 8):
               OLED.pixel(x_axis + offset_ + x,    y+y_axis, int(a_[x]))   
               OLED.pixel(x_axis + offset_ + x +8, y+y_axis, int(b_[x]))   
       offset_ += 16
       
chinese('嵌入式学习',20,0)
OLED.text('Perseverance',15,20)
OLED.text('Hello world',10,36)
OLED.show()