141 lines
4.3 KiB
Python
141 lines
4.3 KiB
Python
# (c) Copyright 2018 by Coinkite Inc. This file is covered by license found in COPYING-CC.
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#
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# ssd1306.py - MicroPython SSD1306 OLED driver, I2C and SPI interfaces
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#
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# Copied from ../external/micropython/drivers/display/ssd1306.py
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#
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import time
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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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self.buffer = bytearray(1024)
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assert len(self.buffer) == 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, 0xF0,
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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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SPI_RATE = const(40000000) # max chip can do, still slower than display limit tho
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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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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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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=SPI_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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try:
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self.spi.write(bytearray([cmd]))
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except:
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print("SPI[cmd]: %r" % self.spi)
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self.cs(1)
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def write_data(self, buf):
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self.spi.init(baudrate=SPI_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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try:
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self.spi.write(buf)
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except:
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print("SPI[data]: %r" % self.spi)
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self.cs(1)
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