#!/usr/bin/env python # # based on code from lrvick and LiquidCrystal # lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py # LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp # Programme orienté objet from time import sleep class Adafruit_CharLCD: # commands. Pour comprendre cela nécessite le datasheet du module LCD LCD_CLEARDISPLAY = 0x01 # 0x01 implique nombre hexadécimal 01 (00000001) LCD_RETURNHOME = 0x02 # (00000010) LCD_ENTRYMODESET = 0x04 # (00000100) LCD_DISPLAYCONTROL = 0x08 # (00001000) LCD_CURSORSHIFT = 0x10 # (00010000) LCD_FUNCTIONSET = 0x20 # (00100000) LCD_SETCGRAMADDR = 0x40 # (01000000) LCD_SETDDRAMADDR = 0x80 # (10000000) # 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 # 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, pin_rs=24, pin_e=23, pins_db=[17, 18, 27, 22], GPIO = None): # Emulate the old behavior of using RPi.GPIO if we haven't been given # an explicit GPIO interface to use if not GPIO: import RPi.GPIO as GPIO # Importation du module GPIO self.GPIO = GPIO self.pin_rs = pin_rs self.pin_e = pin_e self.pins_db = pins_db self.GPIO.setwarnings(False) self.GPIO.setmode(GPIO.BCM) # Définit les pins par le nom GPIO self.GPIO.setup(self.pin_e, GPIO.OUT) # place la pin GPIO23 en sortie self.GPIO.setup(self.pin_rs, GPIO.OUT) # Place la pin GPIO 24 en sortie for pin in self.pins_db: self.GPIO.setup(pin, GPIO.OUT) # Place les pins GPIO 17, 18, 27 et 22 en sorties self.write4bits(0x33) # initialization self.write4bits(0x32) # initialization self.write4bits(0x28) # 2 line 5x7 matrix self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor self.write4bits(0x06) # shift cursor right self.displaycontrol = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF # | C'est un OU logique au niveau binaire self.displayfunction = self.LCD_4BITMODE | self.LCD_1LINE | self.LCD_5x8DOTS self.displayfunction |= self.LCD_2LINE """ Initialize to default text direction (for romance languages) """ self.displaymode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) # set the entry mode self.clear() def begin(self, cols, lines): if (lines > 1): self.numlines = lines self.displayfunction |= self.LCD_2LINE self.currline = 0 def home(self): self.write4bits(self.LCD_RETURNHOME) # set cursor position to zero self.delayMicroseconds(3000) # this command takes a long time! def clear(self): self.write4bits(self.LCD_CLEARDISPLAY) # command to clear display self.delayMicroseconds(3000) # 3000 microsecond sleep, clearing the display takes a long time def setCursor(self, col, row): self.row_offsets = [ 0x00, 0x40, 0x14, 0x54 ] if ( row > self.numlines ): row = self.numlines - 1 # we count rows starting w/0 self.write4bits(self.LCD_SETDDRAMADDR | (col + self.row_offsets[row])) def noDisplay(self): """ Turn the display off (quickly) """ self.displaycontrol &= ~self.LCD_DISPLAYON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def display(self): """ Turn the display on (quickly) """ self.displaycontrol |= self.LCD_DISPLAYON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def noCursor(self): """ Turns the underline cursor on/off """ self.displaycontrol &= ~self.LCD_CURSORON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def cursor(self): """ Cursor On """ self.displaycontrol |= self.LCD_CURSORON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def noBlink(self): """ Turn on and off the blinking cursor """ self.displaycontrol &= ~self.LCD_BLINKON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def DisplayLeft(self): """ These commands scroll the display without changing the RAM """ self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT) def scrollDisplayRight(self): """ These commands scroll the display without changing the RAM """ self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT); def leftToRight(self): """ This is for text that flows Left to Right """ self.displaymode |= self.LCD_ENTRYLEFT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode); def rightToLeft(self): """ This is for text that flows Right to Left """ self.displaymode &= ~self.LCD_ENTRYLEFT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def autoscroll(self): """ This will 'right justify' text from the cursor """ self.displaymode |= self.LCD_ENTRYSHIFTINCREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def noAutoscroll(self): """ This will 'left justify' text from the cursor """ self.displaymode &= ~self.LCD_ENTRYSHIFTINCREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def write4bits(self, bits, char_mode=False): """ Send command to LCD """ self.delayMicroseconds(1000) # 1000 microsecond sleep bits=bin(bits)[2:].zfill(8) self.GPIO.output(self.pin_rs, char_mode) for pin in self.pins_db: self.GPIO.output(pin, False) for i in range(4): if bits[i] == "1": self.GPIO.output(self.pins_db[::-1][i], True) self.pulseEnable() for pin in self.pins_db: self.GPIO.output(pin, False) for i in range(4,8): if bits[i] == "1": self.GPIO.output(self.pins_db[::-1][i-4], True) self.pulseEnable() def delayMicroseconds(self, microseconds): seconds = microseconds / float(1000000) # divide microseconds by 1 million for seconds sleep(seconds) def pulseEnable(self): self.GPIO.output(self.pin_e, False) self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns self.GPIO.output(self.pin_e, True) self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns self.GPIO.output(self.pin_e, False) self.delayMicroseconds(1) # commands need > 37us to settle def message(self, text): """ Send string to LCD. Newline wraps to second line""" for char in text: if char == '\n': #si les caractères "\n" sont rencontrés self.write4bits(0xC0) # saute sur la deuxième ligne du lcd else: self.write4bits(ord(char),True) # Si non écrit le caractère def reset(self): # Ajouter par Richard Fortier self.GPIO.cleanup() #Relache le module GPIO def loop(): lcd = Adafruit_CharLCD() while True: lcd.clear() # Efface l'écran lcd lcd.message(" LCD 1602 Test \n123456789ABCDEF") # Affiche ce message sleep(2) lcd.clear() # Efface l'écran lcd lcd.message("Bonjour, Tous !\nBonjour le monde ! :)") # Affiche ce message sleep(2) lcd.clear() # Efface l'écran lcd lcd.message("Bienvenue a --->\n adeept.com") # Affiche ce message sleep(2) def destroy(): lcd = Adafruit_CharLCD() lcd.clear() # Efface l'écran lcd lcd.reset() # Relache du module GPIO if __name__ == '__main__': # Le proramme commence ici try: loop() # Execute la fonction loop() except KeyboardInterrupt: # Si Ctrl+c sont pressé exécute destroy() # la fonction destroy()