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lcd1602.py
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lcd1602.py
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from machine import I2C, Pin
import time
class LCD1602(object):
#commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80
#flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00
#flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00
#flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00
#flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00
def __init__(self, i2c, lines, dotsize, lcd_addr=0x3E):
self.i2c = i2c
self.lcd_address = lcd_addr
self.line = lines
self.currline = 0;
self.display_control = self.LCD_DISPLAYON
if (lines > 1):
self.display_control |= self.LCD_2LINE
#for some 1 line displays you can select a 10 pixel high font
if (dotsize != 0 & lines == 1):
self.display_control |= self.LCD_5x10DOTS
#SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
#according to datasheet, we need at least 40ms after power rises above 2.7V
#before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
time.sleep_ms(50)
#this is according to the hitachi HD44780 datasheet
#page 45 figure 23
#Send function set command sequence
self.command(self.LCD_FUNCTIONSET | self.display_control)
time.sleep_us(4500) #wait more than 4.1ms
#second try
self.command(self.LCD_FUNCTIONSET | self.display_control)
time.sleep_us(150)
#third go
self.command(self.LCD_FUNCTIONSET | self.display_control)
#finally, set # lines, font size, etc.
self.command(self.LCD_FUNCTIONSET | self.display_control)
#turn the display on with no cursor or blinking default
self.display_mode = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF
self.display()
#clear it off
self.clear()
#Initialize to default text direction (for romance languages)
self.display_mode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT
#set the entry mode
self.command(self.LCD_ENTRYMODESET | self.display_mode)
def clear(self):
self.command(self.LCD_CLEARDISPLAY) #clear display, set cursor position to zero
time.sleep_ms(2) #this command takes a long time!
def home(self):
self.command(self.LCD_RETURNHOME) #set cursor position to zero
time.sleep_ms(2) #this command takes a long time!
def setCursor(self, col, row):
col = (col | 0x80) if row == 0 else (col | 0xc0)
self.command(col)
#Turn the display on/off (quickly)
def no_display(self):
self.display_control &= ~self.LCD_DISPLAYON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def display(self):
self.display_control |= self.LCD_DISPLAYON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
#Turns the underline cursor on/off
def no_cursor(self):
self.display_control &= ~self.LCD_CURSORON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def cursor(self):
self.display_control |= self.LCD_CURSORON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
#Turn on and off the blinking cursor
def no_blink(self):
self.display_control &= ~self.LCD_BLINKON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def blink(self):
self.display_control |= self.LCD_BLINKON
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def autoscroll(self):
self.display_control |= self.LCD_ENTRYSHIFTINCREMENT
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def no_autoscroll(self):
self.display_control &= ~self.LCD_ENTRYSHIFTINCREMENT
self.command(self.LCD_DISPLAYCONTROL | self.display_control)
def create_char(self, location, charmap):
location &= 0x07
self.command(LCD_SETCGRAMADDR | (location << 3))
dta = bytearray([charmap])
self.i2c.writeto_mem(self.address, 0x40, dta)
def command(self, command):
command = bytearray([command])
self.i2c.writeto_mem(self.lcd_address, 0x80, command)
def write(self, command):
command = bytearray([command])
self.i2c.writeto_mem(self.lcd_address, 0x40, command)
def print(self, text):
for char in text:
self.write(ord(char))
class LCD1602_RGB(LCD1602):
# color define
WHITE = 0
RED = 1
GREEN = 2
BLUE = 3
REG_RED = 0x04 # pwm2
REG_GREEN = 0x03 # pwm1
REG_BLUE = 0x02 # pwm0
REG_MODE1 = 0x00
REG_MODE2 = 0x01
REG_OUTPUT = 0x08
def __init__(self, i2c, lines, dotsize, lcd_addr=0x3E, rgb_addr=0x62):
self.rgb_address = rgb_addr
LCD1602.__init__(self, i2c, lines, dotsize, lcd_addr)
#backlight init
self.set_reg(0, 0)
self.set_reg(1, 0)
self.set_reg(0x08, 0xAA) #all led control by pwm
self.set_rgb(255, 255, 255)
def set_reg(self, addr, value):
value = bytearray([value])
self.i2c.writeto_mem(self.rgb_address, addr, bytearray([]))
self.i2c.writeto_mem(self.rgb_address, addr, value)
def set_rgb(self, red, green, blue):
r = int(red)
g = int(green)
b = int(blue)
self.set_reg(self.REG_RED, r)
self.set_reg(self.REG_GREEN, g)
self.set_reg(self.REG_BLUE, b)
def set_color(self, color):
if(color == 0):
self.set_rgb(255, 255, 255)
elif(color == 1):
self.set_rgb(255, 0, 0)
elif(color == 2):
self.set_rgb(0, 255, 0)
elif(color == 3):
self.set_rgb(0, 0, 255)
else:
return