72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
# MicroPython SSD1306 OLED driver, I2C interface
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from micropython import const
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import framebuf
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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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class SSD1306_I2C(framebuf.FrameBuffer):
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def __init__(self, width, height, i2c, addr=0x3C):
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self.width = width
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self.height = height
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self.i2c = i2c
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self.addr = addr
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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 write_cmd(self, cmd):
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self.i2c.writeto(self.addr, bytearray([0x80, cmd]))
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def write_data(self, buf):
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self.i2c.writeto(self.addr, bytearray([0x40]) + buf)
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def init_display(self):
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for cmd in (
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SET_DISP | 0x00,
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SET_MEM_ADDR, 0x00,
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SET_DISP_START_LINE | 0x00,
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SET_SEG_REMAP | 0x01,
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SET_MUX_RATIO, self.height - 1,
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SET_COM_OUT_DIR | 0x08,
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SET_DISP_OFFSET, 0x00,
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SET_COM_PIN_CFG, 0x12,
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SET_DISP_CLK_DIV, 0x80,
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SET_PRECHARGE, 0xF1,
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SET_VCOM_DESEL, 0x30,
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SET_CONTRAST, 0xFF,
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SET_ENTIRE_ON,
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SET_NORM_INV,
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SET_CHARGE_PUMP, 0x14,
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SET_DISP | 0x01,
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):
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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 show(self):
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self.write_cmd(SET_COL_ADDR)
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self.write_cmd(0)
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self.write_cmd(self.width - 1)
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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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