物联网开发笔记（85） |
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物联网开发笔记（85）
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一、目的 这一节我们学习如何使用我们的ESP32开发板来学习通过I2C控制0.91寸OLED液晶屏。 二、环境 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 def LcdShowCh_32x32(n, x_axis, y_axis): for i in range(4): for a in range(32): for b in range(8): if(ByteOpera16x16(b,Chine.chine[n*128+i*32+a])): oled.pixel(x_axis+a,y_axis+i*8+b,1) else: oled.pixel(x_axis+a,y_axis+i*8+b,0) def main(): oled.contrast(155) #0-255 #亮度调节函数 #oled.text("HappyNewYear",0,0) #oled.show() while True: for i in range(4): LcdShowCh_32x32(i,i*32,0) oled.show() if __name__ == "__main__": main()演示效果
五、购买地址 https://item.taobao.com/item.htm?spm=a1z09.2.0.0.51922e8d2uqrYB&id=562145367495&_u=1p01rch224d 0.91寸（4管脚）屏幕资料下载链接： https://pan.baidu.com/s/1jZKWGmQdRcsto-OdbnPmbg 提取码：386h |
https://item.taobao.com/item.htm?spm=a1z09.2.0.0.51922e8d2uqrYB&id=562145367495&_u=1p01rch224d【本文地址】
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