---
# System prepended metadata

title: OLED

---

# OLED
## 成果圖
![](https://i.imgur.com/kjmS8Ld.jpg)

## 主程式
```python=
from machine import Pin, I2C, SoftI2C, SPI, SoftSPI
import chen_ming_ssd1306 as ssd1306
from myfont import words

i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=200000)
display = ssd1306.SSD1306_I2C(128, 64, i2c)
buf1 = [words[each] for each in '國立東華大學']
buf2 = [words[each] for each in '許廷綸']
#中文寬高16
display.write_font(buf1, 0, 0)
display.write_font(buf2, 0, 16)
display.show()
```
## OLED驅動
參考至 https://github.com/micropython/micropython-esp32/blob/esp32/drivers/display/ssd1306.py
```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)


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)
        fb = framebuf.FrameBuffer(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
        self.framebuf = fb
        # Provide methods for accessing FrameBuffer graphics primitives. This is a
        # workround because inheritance from a native class is currently unsupported.
        # http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
        self.fill = fb.fill
        self.pixel = fb.pixel
        self.hline = fb.hline
        self.vline = fb.vline
        self.line = fb.line
        self.rect = fb.rect
        self.fill_rect = fb.fill_rect
        self.text = fb.text
        self.scroll = fb.scroll
        self.blit = fb.blit
        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)
```
## 中文驅動
參考至 https://hackmd.io/@PaoyungChang/mpy_ming_py_march
```python=
import ssd1306
from framebuf import FrameBuffer, MONO_HMSB

def write_font(display, wordsBuf, x, y, invert=False):
    for buf in wordsBuf:
        if invert: # 反白
            buf = [b^0xff for b in buf]
        width = len(buf) // 2 #判斷字寬
        fbuf = FrameBuffer(bytearray(buf), width, 16, MONO_HMSB)
        display.blit(fbuf, x, y, 0)
        x += width
        if x > 128:
            break

class SSD1306_I2C(ssd1306.SSD1306_I2C):
	def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False):
		super().__init__(width, height, i2c, addr, external_vcc)

	def write_font(self, wordsBuf, x, y, invert=False):
		write_font(self, wordsBuf, x, y, invert)

class SSD1306_SPI(ssd1306.SSD1306_SPI):
	def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
		super().__init__( width, height, spi, dc, res, cs, external_vcc)

	def write_font(self, wordsBuf, x, y, invert=False):
		write_font(self, wordsBuf, x, y, invert)
        
```
## 中文文檔
參考至 https://hackmd.io/@PaoyungChang/mpy_ming_py_prelude
    & https://hackmd.io/@LHB-0222/2022micropython#micropython-SSD1306%E4%BD%BF%E7%94%A8%E7%B4%80%E9%8C%84
提取已建立好的中文文檔，得到我們所需的中文字
最後結果:(國立東華大學)
```python=
words={'國': (0, 0, 4, 64, 252, 255, 4, 74, 4, 82, 244, 95, 4, 66, 244, 90, 148, 74, 244, 68, 4, 84, 244, 90, 4, 81, 4, 64, 252, 127, 4, 64), 
'立': (0, 0, 64, 0, 128, 0, 128, 32, 254, 127, 0, 0, 8, 24, 16, 8, 16, 8, 48, 4, 32, 4, 32, 4, 32, 2, 0, 66, 254, 255, 0, 0), 
'東': (0, 0, 0, 3, 0, 65, 254, 255, 0, 1, 248, 63, 8, 33, 248, 63, 8, 33, 248, 63, 128, 1, 64, 7, 32, 25, 24, 225, 6, 65, 0, 1), 
'華': (0, 0, 32, 8, 254, 254, 32, 8, 0, 0, 252, 63, 0, 1, 16, 17, 124, 125, 16, 17, 0, 1, 252, 127, 0, 1, 240, 31, 0, 1, 0, 1), 
'大': (0, 0, 0, 3, 0, 1, 0, 1, 0, 65, 254, 255, 0, 1, 0, 1, 128, 1, 128, 2, 64, 4, 64, 4, 32, 8, 16, 16, 8, 224, 6, 64), 
'學': (0, 0, 168, 34, 24, 121, 136, 34, 56, 56, 136, 34, 56, 57, 136, 34, 252, 255, 4, 64, 226, 47, 0, 4, 252, 127, 0, 2, 128, 3, 0, 1), 
'許': (0, 0, 4, 6, 24, 2, 16, 34, 126, 127, 0, 9, 60, 9, 128, 8, 60, 72, 128, 255, 36, 8, 124, 8, 36, 8, 36, 8, 60, 8, 36, 8), 
'廷': (0, 0, 32, 32, 124, 120, 32, 15, 16, 8, 16, 8, 40, 40, 124, 127, 36, 8, 32, 8, 36, 8, 24, 72, 144, 255, 40, 0, 196, 0, 2, 255), 
'綸': (0, 0, 24, 24, 8, 12, 4, 18, 52, 33, 146, 94, 78, 128, 136, 64, 148, 255, 178, 74, 174, 74, 128, 127, 170, 74, 170, 74, 170, 122, 130, 32)}
```
