MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruit

import 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 = width self.height = height self.external_vcc = external_vcc self.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 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.height == 32 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 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_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 = i2c self.addr = addr self.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=1
    self.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#=0
    self.temp[1] = cmd
    self.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):
    pass

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 self.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()

Verunchikc / proyecto-Buikuan

SSD1306 #14

MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruit

register definitions

Note the subclass must initialize self.framebuf to a framebuffer.

Add an extra byte to the data buffer to hold an I2C data/command byte