# OLED
## 成果圖
## 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)}
```
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