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lopylcd.py
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lopylcd.py
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# Minimal I2C LCD library for LoPy board
# Ported from Adafruit_Python_SSD1306 library by Dmitrii ([email protected])
# Ported to a class and stripped to 128x64 and I2C only
# by Keptenkurk (github.com/keptenkurk)
# v0.9 10/3/18
from machine import I2C
from machine import Pin
import time
class lopylcd:
# I2C OLED
i2c = None
# LCD Control constants
SSD1306_I2C_ADDRESS = 0x3C
SSD1306_SETCONTRAST = 0x81
SSD1306_DISPLAYALLON_RESUME = 0xA4
SSD1306_DISPLAYALLON = 0xA5
SSD1306_NORMALDISPLAY = 0xA6
SSD1306_INVERTDISPLAY = 0xA7
SSD1306_DISPLAYOFF = 0xAE
SSD1306_DISPLAYON = 0xAF
SSD1306_SETDISPLAYOFFSET = 0xD3
SSD1306_SETCOMPINS = 0xDA
SSD1306_SETVCOMDETECT = 0xDB
SSD1306_SETDISPLAYCLOCKDIV = 0xD5
SSD1306_SETPRECHARGE = 0xD9
SSD1306_SETMULTIPLEX = 0xA8
SSD1306_SETLOWCOLUMN = 0x00
SSD1306_SETHIGHCOLUMN = 0x10
SSD1306_SETSTARTLINE = 0x40
SSD1306_MEMORYMODE = 0x20
SSD1306_COLUMNADDR = 0x21
SSD1306_PAGEADDR = 0x22
SSD1306_COMSCANINC = 0xC0
SSD1306_COMSCANDEC = 0xC8
SSD1306_SEGREMAP = 0xA0
SSD1306_CHARGEPUMP = 0x8D
SSD1306_EXTERNALVCC = 0x1
SSD1306_SWITCHCAPVCC = 0x2
# Scrolling constants
SSD1306_ACTIVATE_SCROLL = 0x2F
SSD1306_DEACTIVATE_SCROLL = 0x2E
SSD1306_SET_VERTICAL_SCROLL_AREA = 0xA3
SSD1306_RIGHT_HORIZONTAL_SCROLL = 0x26
SSD1306_LEFT_HORIZONTAL_SCROLL = 0x27
SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = 0x29
SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL = 0x2A
# Font data. Taken from https://github.com/hsmptg/lcd/blob/master/font.py
font = [
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x5F, 0x00, 0x00,
0x00, 0x07, 0x00, 0x07, 0x00,
0x14, 0x7F, 0x14, 0x7F, 0x14,
0x24, 0x2A, 0x7F, 0x2A, 0x12,
0x23, 0x13, 0x08, 0x64, 0x62,
0x36, 0x49, 0x56, 0x20, 0x50,
0x00, 0x08, 0x07, 0x03, 0x00,
0x00, 0x1C, 0x22, 0x41, 0x00,
0x00, 0x41, 0x22, 0x1C, 0x00,
0x2A, 0x1C, 0x7F, 0x1C, 0x2A,
0x08, 0x08, 0x3E, 0x08, 0x08,
0x00, 0x80, 0x70, 0x30, 0x00,
0x08, 0x08, 0x08, 0x08, 0x08,
0x00, 0x00, 0x60, 0x60, 0x00,
0x20, 0x10, 0x08, 0x04, 0x02,
0x3E, 0x51, 0x49, 0x45, 0x3E,
0x00, 0x42, 0x7F, 0x40, 0x00,
0x72, 0x49, 0x49, 0x49, 0x46,
0x21, 0x41, 0x49, 0x4D, 0x33,
0x18, 0x14, 0x12, 0x7F, 0x10,
0x27, 0x45, 0x45, 0x45, 0x39,
0x3C, 0x4A, 0x49, 0x49, 0x31,
0x41, 0x21, 0x11, 0x09, 0x07,
0x36, 0x49, 0x49, 0x49, 0x36,
0x46, 0x49, 0x49, 0x29, 0x1E,
0x00, 0x00, 0x14, 0x00, 0x00,
0x00, 0x40, 0x34, 0x00, 0x00,
0x00, 0x08, 0x14, 0x22, 0x41,
0x14, 0x14, 0x14, 0x14, 0x14,
0x00, 0x41, 0x22, 0x14, 0x08,
0x02, 0x01, 0x59, 0x09, 0x06,
0x3E, 0x41, 0x5D, 0x59, 0x4E,
0x7C, 0x12, 0x11, 0x12, 0x7C,
0x7F, 0x49, 0x49, 0x49, 0x36,
0x3E, 0x41, 0x41, 0x41, 0x22,
0x7F, 0x41, 0x41, 0x41, 0x3E,
0x7F, 0x49, 0x49, 0x49, 0x41,
0x7F, 0x09, 0x09, 0x09, 0x01,
0x3E, 0x41, 0x41, 0x51, 0x73,
0x7F, 0x08, 0x08, 0x08, 0x7F,
0x00, 0x41, 0x7F, 0x41, 0x00,
0x20, 0x40, 0x41, 0x3F, 0x01,
0x7F, 0x08, 0x14, 0x22, 0x41,
0x7F, 0x40, 0x40, 0x40, 0x40,
0x7F, 0x02, 0x1C, 0x02, 0x7F,
0x7F, 0x04, 0x08, 0x10, 0x7F,
0x3E, 0x41, 0x41, 0x41, 0x3E,
0x7F, 0x09, 0x09, 0x09, 0x06,
0x3E, 0x41, 0x51, 0x21, 0x5E,
0x7F, 0x09, 0x19, 0x29, 0x46,
0x26, 0x49, 0x49, 0x49, 0x32,
0x03, 0x01, 0x7F, 0x01, 0x03,
0x3F, 0x40, 0x40, 0x40, 0x3F,
0x1F, 0x20, 0x40, 0x20, 0x1F,
0x3F, 0x40, 0x38, 0x40, 0x3F,
0x63, 0x14, 0x08, 0x14, 0x63,
0x03, 0x04, 0x78, 0x04, 0x03,
0x61, 0x59, 0x49, 0x4D, 0x43,
0x00, 0x7F, 0x41, 0x41, 0x41,
0x02, 0x04, 0x08, 0x10, 0x20,
0x00, 0x41, 0x41, 0x41, 0x7F,
0x04, 0x02, 0x01, 0x02, 0x04,
0x40, 0x40, 0x40, 0x40, 0x40,
0x00, 0x03, 0x07, 0x08, 0x00,
0x20, 0x54, 0x54, 0x78, 0x40,
0x7F, 0x28, 0x44, 0x44, 0x38,
0x38, 0x44, 0x44, 0x44, 0x28,
0x38, 0x44, 0x44, 0x28, 0x7F,
0x38, 0x54, 0x54, 0x54, 0x18,
0x00, 0x08, 0x7E, 0x09, 0x02,
0x18, 0xA4, 0xA4, 0x9C, 0x78,
0x7F, 0x08, 0x04, 0x04, 0x78,
0x00, 0x44, 0x7D, 0x40, 0x00,
0x20, 0x40, 0x40, 0x3D, 0x00,
0x7F, 0x10, 0x28, 0x44, 0x00,
0x00, 0x41, 0x7F, 0x40, 0x00,
0x7C, 0x04, 0x78, 0x04, 0x78,
0x7C, 0x08, 0x04, 0x04, 0x78,
0x38, 0x44, 0x44, 0x44, 0x38,
0xFC, 0x18, 0x24, 0x24, 0x18,
0x18, 0x24, 0x24, 0x18, 0xFC,
0x7C, 0x08, 0x04, 0x04, 0x08,
0x48, 0x54, 0x54, 0x54, 0x24,
0x04, 0x04, 0x3F, 0x44, 0x24,
0x3C, 0x40, 0x40, 0x20, 0x7C,
0x1C, 0x20, 0x40, 0x20, 0x1C,
0x3C, 0x40, 0x30, 0x40, 0x3C,
0x44, 0x28, 0x10, 0x28, 0x44,
0x4C, 0x90, 0x90, 0x90, 0x7C,
0x44, 0x64, 0x54, 0x4C, 0x44,
0x00, 0x08, 0x36, 0x41, 0x00,
0x00, 0x00, 0x77, 0x00, 0x00,
0x00, 0x41, 0x36, 0x08, 0x00,
0x02, 0x01, 0x02, 0x04, 0x02,
0x3C, 0x26, 0x23, 0x26, 0x3C]
def isConnected(self):
return self.SSD1306_I2C_ADDRESS in self.i2c.scan()
def command(self, *commandbytes):
senddata = bytearray([0])
for i in commandbytes:
senddata.append(i)
self.i2c.writeto(self.SSD1306_I2C_ADDRESS, senddata)
def set_contrast(self, contrast):
# Sets the contrast of the display
# Contrast should be a value between 0 and 255
if 0 <= contrast <= 255:
self.command(self.SSD1306_SETCONTRAST, contrast)
def displayOff(self):
self.command(self.SSD1306_DISPLAYOFF)
def displayOn(self):
self.command(self.SSD1306_DISPLAYON)
def clearBuffer(self):
for i in range(0, len(self.buffer)):
self.buffer[i] = 0
def addString(self, x, y, str):
symPos = self.width * y + 6 * x
for i in range(0, len(str)):
c = 5 * (ord(str[i]) - 32)
self.buffer[symPos] = self.font[c]
for j in range(1, 5):
self.buffer[symPos + j] = self.font[c + j]
symPos += 6
def drawBuffer(self):
self.command(self.SSD1306_SETLOWCOLUMN)
self.command(self.SSD1306_SETHIGHCOLUMN)
self.command(self.SSD1306_SETSTARTLINE)
# Write display buffer to physical display.
line = [0] * 17
line[0] = 0x40
for i in range(0, len(self.buffer), 16):
for p in range(0, 16):
line[p + 1] = self.buffer[i + p]
self.i2c.writeto(self.SSD1306_I2C_ADDRESS, bytearray(line))
def __init__(self, sda_pin, scl_pin):
# 128x64 I2C OLED Display
self.width = 0x80
self.height = 0x40
self.pages = 8 # height/8
self.buffer = [0]*1024 # 128*64/8
self.sda = sda_pin
self.scl = scl_pin
self.i2c = I2C(0, I2C.MASTER, pins=(self.sda, self.scl), baudrate=100000)
if self.isConnected():
self.command(self.SSD1306_DISPLAYOFF)
self.command(self.SSD1306_DISPLAYALLON_RESUME)
self.command(self.SSD1306_SETDISPLAYCLOCKDIV, 0x80)
self.command(self.SSD1306_SETMULTIPLEX, 0x3F)
self.command(self.SSD1306_SETDISPLAYOFFSET, 0x0)
self.command(self.SSD1306_SETSTARTLINE | 0x0)
self.command(self.SSD1306_CHARGEPUMP, 0x14)
self.command(self.SSD1306_MEMORYMODE, 0x00)
self.command(self.SSD1306_COLUMNADDR, 0, self.width-1)
self.command(self.SSD1306_PAGEADDR, 0, self.pages-1)
self.command(self.SSD1306_SEGREMAP | 0x1)
self.command(self.SSD1306_COMSCANDEC)
self.command(self.SSD1306_SETCOMPINS, 0x12)
self.command(self.SSD1306_SETCONTRAST, 0xCF)
self.command(self.SSD1306_SETPRECHARGE, 0xF1)
self.command(self.SSD1306_SETVCOMDETECT, 0x40)
self.command(self.SSD1306_NORMALDISPLAY)
self.command(self.SSD1306_DISPLAYON)
else:
print('Unable to find display at address ', self.SSD1306_I2C_ADDRESS)