132 lines
4.2 KiB
Python
132 lines
4.2 KiB
Python
# MicroPython SSD1306 OLED I2C driver
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from micropython import const
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import framebuf
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import utime
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SSD1306_I2C_ADDR = 0x3C
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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, # display off
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# address setting
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SET_MEM_ADDR,
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0x00, # horizontal
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# resolution and layout
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SET_DISP_START_LINE, # start at line 0
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SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
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SET_MUX_RATIO,
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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,
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0x00,
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SET_COM_PIN_CFG,
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0x02 if self.width > 2 * self.height else 0x12,
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# timing and driving scheme
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SET_DISP_CLK_DIV,
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0x80,
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SET_PRECHARGE,
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0x22 if self.external_vcc else 0xF1,
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SET_VCOM_DESEL,
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0x30, # 0.83*Vcc
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# display
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SET_CONTRAST,
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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,
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0x10 if self.external_vcc else 0x14,
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SET_DISP | 0x01, # display on
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): # 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)
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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 rotate(self, rotate):
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self.write_cmd(SET_COM_OUT_DIR | ((rotate & 1) << 3))
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self.write_cmd(SET_SEG_REMAP | (rotate & 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=SSD1306_I2C_ADDR, external_vcc=False):
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if i2c == None:
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raise ValueError("I2C object 'SSD1306' needed as argument!")
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self._i2c = i2c
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utime.sleep_ms(200)
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i2cModules = self._i2c.scan()
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if addr not in i2cModules:
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error = "Unable to find module 'SSD1306' at address " + str(hex(addr)) + ". Please check connections with the board.\n"
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error += "[Info] I2C address.es detected: " + str([hex(a) for a in i2cModules])
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raise ValueError(error)
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self._addr = addr
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self.temp = bytearray(2)
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self.write_list = [b"\x40", None] # Co=0, D/C#=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.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.write_list[1] = buf
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self._i2c.writevto(self._addr, self.write_list)
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