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ssd1306.py
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ssd1306.py
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# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
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)
SET_HWSCROLL_OFF = const(0x2e)
SET_HWSCROLL_ON = const(0x2f)
SET_HWSCROLL_RIGHT = const(0x26)
SET_HWSCROLL_LEFT = const(0x27)
#SET_HWSCROLL_VR = const(0x29)
#SET_HWSCROLL_VL = const(0x2a)
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
self.buffer = bytearray(self.pages * self.width)
self.framebuf = framebuf.FrameBuffer1(self.buffer, self.width, self.height)
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_data(self.buffer)
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)
self.show()
def clear(self):
self.fill(0)
self.show()
def hw_scroll_off(self):
self.write_cmd(SET_HWSCROLL_OFF) # turn off scroll
def hw_scroll_h(self, direction=True): # default to scroll right
self.write_cmd(SET_HWSCROLL_OFF) # turn off hardware scroll per SSD1306 datasheet
if not direction:
self.write_cmd(SET_HWSCROLL_LEFT)
self.write_cmd(0x00) # dummy byte
self.write_cmd(0x07) # start page = page 7
self.write_cmd(0x00) # frequency = 5 frames
self.write_cmd(0x00) # end page = page 0
else:
self.write_cmd(SET_HWSCROLL_RIGHT)
self.write_cmd(0x00) # dummy byte
self.write_cmd(0x00) # start page = page 0
self.write_cmd(0x00) # frequency = 5 frames
self.write_cmd(0x07) # end page = page 7
self.write_cmd(0x00)
self.write_cmd(0xff)
self.write_cmd(SET_HWSCROLL_ON) # activate scroll
"""
# This is for the diagonal scroll, it shows wierd actifacts on the lcd!!
def hw_scroll_diag(self, direction=True): # default to scroll verticle and right
self.write_cmd(SET_HWSCROLL_OFF) # turn off hardware scroll per SSD1306 datasheet
if not direction:
self.write_cmd(SET_HWSCROLL_VL)
self.write_cmd(0x00) # dummy byte
self.write_cmd(0x07) # start page = page 7
self.write_cmd(0x00) # frequency = 5 frames
self.write_cmd(0x00) # end page = page 0
self.write_cmd(self.height)
else:
self.write_cmd(SET_HWSCROLL_VR)
self.write_cmd(0x00) # dummy byte
self.write_cmd(0x00) # start page = page 0
self.write_cmd(0x00) # frequency = 5 frames
self.write_cmd(0x07) # end page = page 7
self.write_cmd(self.height)
self.write_cmd(0x00)
self.write_cmd(0xff)
self.write_cmd(SET_HWSCROLL_ON) # activate scroll
"""
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)
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_data(self, buf):
self.temp[0] = self.addr << 1
self.temp[1] = 0x40 # Co=0, D/C#=1
self.i2c.start()
self.i2c.write(self.temp)
self.i2c.write(buf)
self.i2c.stop()
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
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_data(self, buf):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs.high()
self.dc.high()
self.cs.low()
self.spi.write(buf)
self.cs.high()
def poweron(self):
self.res.high()
time.sleep_ms(1)
self.res.low()
time.sleep_ms(10)
self.res.high()