mirror of
https://github.com/KevinMidboe/Node-Com-Handler.git
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170 lines
4.2 KiB
Python
170 lines
4.2 KiB
Python
#!/usr/bin/python
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#--------------------------------------
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# ___ ___ _ ____
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# / _ \/ _ \(_) __/__ __ __
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# / , _/ ___/ /\ \/ _ \/ // /
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# /_/|_/_/ /_/___/ .__/\_, /
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# /_/ /___/
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#
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# lcd_i2c.py
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# LCD test script using I2C backpack.
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# Supports 16x2 and 20x4 screens.
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#
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# Author : Matt Hawkins
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# Date : 20/09/2015
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#
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# http://www.raspberrypi-spy.co.uk/
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#
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# Copyright 2015 Matt Hawkins
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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#--------------------------------------
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import smbus
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import time
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from socket import *
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host = '10.0.0.41'
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port = 12000
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clientSocket = socket(AF_INET, SOCK_DGRAM)
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# Define some device parameters
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I2C_ADDR = 0x27 # I2C device address
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LCD_WIDTH = 20 # Maximum characters per line
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# Define some device constants
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LCD_CHR = 1 # Mode - Sending data
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LCD_CMD = 0 # Mode - Sending command
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LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
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LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
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LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line
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LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line
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LCD_BACKLIGHT = 0x08 # On
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#LCD_BACKLIGHT = 0x00 # Off
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ENABLE = 0b00000100 # Enable bit
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# Timing constants
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E_PULSE = 0.0005
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E_DELAY = 0.0005
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#Open I2C interface
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#bus = smbus.SMBus(0) # Rev 1 Pi uses 0
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bus = smbus.SMBus(1) # Rev 2 Pi uses 1
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def lcd_init():
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# Initialise display
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lcd_byte(0x33,LCD_CMD) # 110011 Initialise
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lcd_byte(0x32,LCD_CMD) # 110010 Initialise
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lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction
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lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off
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lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size
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lcd_byte(0x01,LCD_CMD) # 000001 Clear display
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time.sleep(E_DELAY)
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def lcd_byte(bits, mode):
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# Send byte to data pins
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# bits = the data
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# mode = 1 for data
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# 0 for command
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bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT
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bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT
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# High bits
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bus.write_byte(I2C_ADDR, bits_high)
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lcd_toggle_enable(bits_high)
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# Low bits
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bus.write_byte(I2C_ADDR, bits_low)
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lcd_toggle_enable(bits_low)
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def lcd_toggle_enable(bits):
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# Toggle enable
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time.sleep(E_DELAY)
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bus.write_byte(I2C_ADDR, (bits | ENABLE))
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time.sleep(E_PULSE)
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bus.write_byte(I2C_ADDR,(bits & ~ENABLE))
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time.sleep(E_DELAY)
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def lcd_string(message,line):
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# Send string to display
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message = message.ljust(LCD_WIDTH," ")
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lcd_byte(line, LCD_CMD)
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for i in range(LCD_WIDTH):
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lcd_byte(ord(message[i]),LCD_CHR)
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def callApollo():
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clientSocket.sendto('i2c', (host, port))
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clientSocket.settimeout(5.0)
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message, address = clientSocket.recvfrom(1024)
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message = message.split('$')
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message.reverse()
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return message
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def main():
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# Main program block
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# Initialise display
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lcd_init()
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while True:
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# Send some test
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message = callApollo()
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lcd_string(message.pop(), LCD_LINE_1)
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lcd_string(message.pop(), LCD_LINE_2)
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lcd_string(message.pop(), LCD_LINE_3)
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lcd_string(message.pop(), LCD_LINE_4)
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time.sleep(9)
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lcd_string('', LCD_LINE_1)
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lcd_string('', LCD_LINE_2)
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lcd_string('', LCD_LINE_3)
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lcd_string('', LCD_LINE_4)
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try:
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lcd_string(message.pop(), LCD_LINE_1)
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lcd_string(message.pop(), LCD_LINE_2)
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lcd_string(message.pop(), LCD_LINE_3)
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lcd_string(message.pop(), LCD_LINE_4)
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except:
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pass
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time.sleep(9)
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# Send some more text
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lcd_string("PU 27/05 Eksamen",LCD_LINE_1)
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lcd_string("MMI 01/06 Eksamen",LCD_LINE_2)
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lcd_string("DB 04/06 Eksamen", LCD_LINE_3)
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lcd_string("KTN 08/06 Eksamen",LCD_LINE_4)
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time.sleep(9)
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if __name__ == '__main__':
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try:
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main()
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except KeyboardInterrupt:
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pass
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finally:
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lcd_byte(0x01, LCD_CMD)
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