Created
March 14, 2018 14:50
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Liquid Crystal library for Pi
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| import LiquidCrystalPi as display | |
| # LCD = display.LCD(29, 31, 33, 35, 37, 38) # for GPIO BOARD | |
| LCD = display.LCD(5, 6, 13, 19, 26, 20) # for GPIO BCM | |
| LCD.begin(16, 2) | |
| LCD.clear() | |
| LCD.write("Test") | |
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| _rs_pin = None | |
| _rw_pin = None | |
| _enable_pin = None | |
| _data_pins = [None]*4 | |
| _numlines = 0 | |
| _displayfunction = 0 | |
| _displaycontrol = 0 | |
| _row_offsets = [None]*4 | |
| class LCD: | |
| import RPi.GPIO as GPIO | |
| import time as time | |
| def __init__(self, rs, enable, d0, d1, d2, d3): | |
| global _rs_pin, _enable_pin, _data_pins | |
| _rs_pin = rs | |
| _enable_pin = enable | |
| _data_pins[0] = d0 | |
| _data_pins[1] = d1 | |
| _data_pins[2] = d2 | |
| _data_pins[3] = d3 | |
| self.GPIO.setup(_rs_pin, self.GPIO.OUT) | |
| self.GPIO.setup(_enable_pin, self.GPIO.OUT) | |
| self.begin(16, 1) | |
| def begin(self, cols, lines): | |
| global _displayfunction, _numlines, _displacontrol, _displaymode | |
| if lines > 1: | |
| _displayfunction |= 0x08 | |
| _numlines = lines | |
| self.setRowOffsets(0x00, 0x40, 0x00 + cols, 0x40 + cols) | |
| self.time.sleep(0.05) | |
| self.GPIO.output(_rs_pin, 0) | |
| self.GPIO.output(_enable_pin, 0) | |
| self.write4bits(0x03) | |
| self.time.sleep(0.0041) | |
| self.write4bits(0x03) | |
| self.time.sleep(0.0041) | |
| self.write4bits(0x03) | |
| self.time.sleep(0.00015) | |
| self.write4bits(0x02) | |
| self.command(0x20 | _displayfunction) | |
| _displaycontrol = 0x04 | 0x00 | 0x00 | |
| self.display() | |
| self.clear() | |
| _displaymode = 0x02 | 0x00 | |
| self.command(0x04 | _displaymode) | |
| def setRowOffsets(self,row0,row1,row2,row3): | |
| _row_offsets[0] = row0; | |
| _row_offsets[1] = row1; | |
| _row_offsets[2] = row2; | |
| _row_offsets[3] = row3; | |
| def clear(self): | |
| self.command(1) | |
| self.time.sleep(0.002) | |
| def home(self): | |
| self.command(2) | |
| self.time.sleep(0.002) | |
| def nextline(self): | |
| self.command(192) | |
| self.time.sleep(0.002) | |
| def moveright(self): | |
| self.command(20) | |
| self.time.sleep(0.002) | |
| def moveleft(self): | |
| self.command(16) | |
| self.time.sleep(0.002) | |
| def display(self): | |
| global _displaycontrol | |
| _displaycontrol |= 0x04 | |
| self.command(0x08 | _displaycontrol) | |
| def command(self,value): | |
| self.send(value, 0) | |
| def write(self,value): | |
| char = list(value) | |
| for i in range (0, len(char)): | |
| self.send(ord(char[i]), 1) | |
| def send(self,value, mode): | |
| global _rs_pin | |
| self.GPIO.output(_rs_pin, mode) | |
| self.write4bits(value >> 4) | |
| self.write4bits(value) | |
| def pulseEnable(self): | |
| self.GPIO.output(_enable_pin, 0) | |
| self.time.sleep(0.000001) | |
| self.GPIO.output(_enable_pin, 1) | |
| self.time.sleep(0.000001) | |
| self.GPIO.output(_enable_pin, 0) | |
| self.time.sleep(0.0001) | |
| def write4bits(self,value): | |
| for i in range(0,4): | |
| self.GPIO.setup(_data_pins[i], self.GPIO.OUT) | |
| self.GPIO.output(_data_pins[i], (value >> i) & 0x01) | |
| self.pulseEnable() |
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