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147 lines
4.5 KiB
147 lines
4.5 KiB
# MicroPython SSD1306 OLED driver, I2C and SPI interfaces |
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from micropython import const |
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import framebuf |
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# register definitions |
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SET_CONTRAST = const(0x81) |
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SET_ENTIRE_ON = const(0xa4) |
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SET_NORM_INV = const(0xa6) |
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SET_DISP = const(0xae) |
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SET_MEM_ADDR = const(0x20) |
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SET_COL_ADDR = const(0x21) |
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SET_PAGE_ADDR = const(0x22) |
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SET_DISP_START_LINE = const(0x40) |
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SET_SEG_REMAP = const(0xa0) |
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SET_MUX_RATIO = const(0xa8) |
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SET_COM_OUT_DIR = const(0xc0) |
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SET_DISP_OFFSET = const(0xd3) |
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SET_COM_PIN_CFG = const(0xda) |
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SET_DISP_CLK_DIV = const(0xd5) |
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SET_PRECHARGE = const(0xd9) |
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SET_VCOM_DESEL = const(0xdb) |
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SET_CHARGE_PUMP = const(0x8d) |
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# Subclassing FrameBuffer provides support for graphics primitives |
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# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html |
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class SSD1306(framebuf.FrameBuffer): |
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def __init__(self, width, height, external_vcc): |
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self.width = width |
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self.height = height |
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self.external_vcc = external_vcc |
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self.pages = self.height // 8 |
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self.buffer = bytearray(self.pages * self.width) |
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super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB) |
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self.init_display() |
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def init_display(self): |
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for cmd in ( |
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SET_DISP | 0x00, # off |
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# address setting |
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SET_MEM_ADDR, 0x00, # horizontal |
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# resolution and layout |
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SET_DISP_START_LINE | 0x00, |
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SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0 |
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SET_MUX_RATIO, self.height - 1, |
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SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0 |
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SET_DISP_OFFSET, 0x00, |
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SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12, |
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# timing and driving scheme |
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SET_DISP_CLK_DIV, 0x80, |
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SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1, |
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SET_VCOM_DESEL, 0x30, # 0.83*Vcc |
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# display |
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SET_CONTRAST, 0xff, # maximum |
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SET_ENTIRE_ON, # output follows RAM contents |
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SET_NORM_INV, # not inverted |
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# charge pump |
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SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14, |
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SET_DISP | 0x01): # on |
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self.write_cmd(cmd) |
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self.fill(0) |
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self.show() |
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def poweroff(self): |
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self.write_cmd(SET_DISP | 0x00) |
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def poweron(self): |
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self.write_cmd(SET_DISP | 0x01) |
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def contrast(self, contrast): |
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self.write_cmd(SET_CONTRAST) |
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self.write_cmd(contrast) |
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def invert(self, invert): |
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self.write_cmd(SET_NORM_INV | (invert & 1)) |
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def show(self): |
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x0 = 0 |
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x1 = self.width - 1 |
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if self.width == 64: |
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# displays with width of 64 pixels are shifted by 32 |
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x0 += 32 |
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x1 += 32 |
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self.write_cmd(SET_COL_ADDR) |
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self.write_cmd(x0) |
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self.write_cmd(x1) |
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self.write_cmd(SET_PAGE_ADDR) |
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self.write_cmd(0) |
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self.write_cmd(self.pages - 1) |
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self.write_data(self.buffer) |
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class SSD1306_I2C(SSD1306): |
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def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False): |
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self.i2c = i2c |
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self.addr = addr |
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self.temp = bytearray(2) |
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super().__init__(width, height, external_vcc) |
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def write_cmd(self, cmd): |
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self.temp[0] = 0x80 # Co=1, D/C#=0 |
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self.temp[1] = cmd |
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self.i2c.writeto(self.addr, self.temp) |
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def write_data(self, buf): |
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self.temp[0] = self.addr << 1 |
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self.temp[1] = 0x40 # Co=0, D/C#=1 |
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self.i2c.start() |
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self.i2c.write(self.temp) |
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self.i2c.write(buf) |
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self.i2c.stop() |
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class SSD1306_SPI(SSD1306): |
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def __init__(self, width, height, spi, dc, res, cs, external_vcc=False): |
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self.rate = 10 * 1024 * 1024 |
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dc.init(dc.OUT, value=0) |
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res.init(res.OUT, value=0) |
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cs.init(cs.OUT, value=1) |
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self.spi = spi |
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self.dc = dc |
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self.res = res |
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self.cs = cs |
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import time |
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self.res(1) |
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time.sleep_ms(1) |
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self.res(0) |
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time.sleep_ms(10) |
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self.res(1) |
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super().__init__(width, height, external_vcc) |
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def write_cmd(self, cmd): |
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self.spi.init(baudrate=self.rate, polarity=0, phase=0) |
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self.cs(1) |
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self.dc(0) |
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self.cs(0) |
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self.spi.write(bytearray([cmd])) |
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self.cs(1) |
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def write_data(self, buf): |
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self.spi.init(baudrate=self.rate, polarity=0, phase=0) |
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self.cs(1) |
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self.dc(1) |
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self.cs(0) |
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self.spi.write(buf) |
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self.cs(1)
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