ssd1306.py

esp32、8266等microPython设备的显示屏驱动代码，可用于I2C及SPI
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#MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruitimport time
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)class SSD1306:def __init__(self, width, height, external_vcc):self.width = widthself.height = heightself.external_vcc = external_vccself.pages = self.height // 8# Note the subclass must initialize self.framebuf to a framebuffer.# This is necessary because the underlying data buffer is different# between I2C and SPI implementations (I2C needs an extra byte).self.poweron()self.init_display()def init_display(self):for cmd in (SET_DISP | 0x00, # off# address settingSET_MEM_ADDR, 0x00, # horizontal# resolution and layoutSET_DISP_START_LINE | 0x00,SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0SET_MUX_RATIO, self.height - 1,SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0SET_DISP_OFFSET, 0x00,SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,# timing and driving schemeSET_DISP_CLK_DIV, 0x80,SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,SET_VCOM_DESEL, 0x30, # 0.83*Vcc# displaySET_CONTRAST, 0xff, # maximumSET_ENTIRE_ON, # output follows RAM contentsSET_NORM_INV, # not inverted# charge pumpSET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,SET_DISP | 0x01): # onself.write_cmd(cmd)self.fill(0)self.show()def poweroff(self):self.write_cmd(SET_DISP | 0x00)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 = 0x1 = self.width - 1if self.width == 64:# displays with width of 64 pixels are shifted by 32x0 += 32x1 += 32self.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_framebuf()def fill(self, col):self.framebuf.fill(col)def pixel(self, x, y, col):self.framebuf.pixel(x, y, col)def scroll(self, dx, dy):self.framebuf.scroll(dx, dy)def text(self, string, x, y, col=1):self.framebuf.text(string, x, y, col)class SSD1306_I2C(SSD1306):def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):self.i2c = i2cself.addr = addrself.temp = bytearray(2)# Add an extra byte to the data buffer to hold an I2C data/command byte# to use hardware-compatible I2C transactions.  A memoryview of the# buffer is used to mask this byte from the framebuffer operations# (without a major memory hit as memoryview doesn't copy to a separate# buffer).self.buffer = bytearray(((height // 8) * width) + 1)self.buffer[0] = 0x40  # Set first byte of data buffer to Co=0, D/C=1self.framebuf = framebuf.FrameBuffer1(memoryview(self.buffer)[1:], width, height)super().__init__(width, height, external_vcc)def write_cmd(self, cmd):self.temp[0] = 0x80 # Co=1, D/C#=0self.temp[1] = cmdself.i2c.writeto(self.addr, self.temp)def write_framebuf(self):# Blast out the frame buffer using a single I2C transaction to support# hardware I2C interfaces.self.i2c.writeto(self.addr, self.buffer)def poweron(self):passclass SSD1306_SPI(SSD1306):def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):self.rate = 10 * 1024 * 1024dc.init(dc.OUT, value=0)res.init(res.OUT, value=0)cs.init(cs.OUT, value=1)self.spi = spiself.dc = dcself.res = resself.cs = csself.buffer = bytearray((height // 8) * width)self.framebuf = framebuf.FrameBuffer1(self.buffer, width, height)super().__init__(width, height, external_vcc)def write_cmd(self, cmd):self.spi.init(baudrate=self.rate, polarity=0, phase=0)self.cs.high()self.dc.low()self.cs.low()self.spi.write(bytearray([cmd]))self.cs.high()def write_framebuf(self):self.spi.init(baudrate=self.rate, polarity=0, phase=0)self.cs.high()self.dc.high()self.cs.low()self.spi.write(self.buffer)self.cs.high()def poweron(self):self.res.high()time.sleep_ms(1)self.res.low()time.sleep_ms(10)self.res.high()

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