148 lines
4.5 KiB
Python
148 lines
4.5 KiB
Python
# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
|
|
|
|
from micropython import const
|
|
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)
|
|
|
|
# Subclassing FrameBuffer provides support for graphics primitives
|
|
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
|
|
class SSD1306(framebuf.FrameBuffer):
|
|
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)
|
|
super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
|
|
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 poweron(self):
|
|
self.write_cmd(SET_DISP | 0x01)
|
|
|
|
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)
|
|
|
|
|
|
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()
|
|
|
|
|
|
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
|
|
import time
|
|
self.res(1)
|
|
time.sleep_ms(1)
|
|
self.res(0)
|
|
time.sleep_ms(10)
|
|
self.res(1)
|
|
super().__init__(width, height, external_vcc)
|
|
|
|
def write_cmd(self, cmd):
|
|
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
|
|
self.cs(1)
|
|
self.dc(0)
|
|
self.cs(0)
|
|
self.spi.write(bytearray([cmd]))
|
|
self.cs(1)
|
|
|
|
def write_data(self, buf):
|
|
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
|
|
self.cs(1)
|
|
self.dc(1)
|
|
self.cs(0)
|
|
self.spi.write(buf)
|
|
self.cs(1)
|