Orange PI LCD test

README.md

python package pyA20 found here:

https://github.com/duxingkei33/orangepi_PC_gpio_pyH3.git

lcd_16x2-orangepi.py

#!/usr/bin/python
#--------------------------------------
#		___	___	_ ____
#	 / _ \/ _ \(_) __/__	__ __
#	/ , _/ ___/ /\ \/ _ \/ // /
# /_/|_/_/	/_/___/ .__/\_, /
#								/_/	 /___/
#
#	lcd_16x2.py
#	16x2 LCD Test Script
#
# Author : Matt Hawkins
# Date	 : 06/04/2015
#
# http://www.raspberrypi-spy.co.uk/
#
#--------------------------------------

# The wiring for the LCD is as follows:
# 1 : GND
# 2 : 5V
# 3 : Contrast (0-5V)*
# 4 : RS (Register Select)
# 5 : R/W (Read Write)			 - GROUND THIS PIN
# 6 : Enable or Strobe
# 7 : Data Bit 0						 - NOT USED
# 8 : Data Bit 1						 - NOT USED
# 9 : Data Bit 2						 - NOT USED
# 10: Data Bit 3						 - NOT USED
# 11: Data Bit 4
# 12: Data Bit 5
# 13: Data Bit 6
# 14: Data Bit 7
# 15: LCD Backlight +5V**
# 16: LCD Backlight GND

#import
#import RPi.gpio.as GPIO
from pyA20.gpio import gpio
from pyA20.gpio import port
import time

# Define gpio.to LCD mapping
# for RaspberryPi
#LCD_RS = 7
#LCD_E	= 8
#LCD_D4 = 25
#LCD_D5 = 24
#LCD_D6 = 23
#LCD_D7 = 18

# for OrangePi
LCD_RS = port.PD14 #PIN 12
LCD_E  = port.PC4  #PIN 16
LCD_D4 = port.PC7  #PIN 18
LCD_D5 = port.PA2  #PIN 22
LCD_D6 = port.PC3  #PIN 24
LCD_D7 = port.PA21 #PIN 26

# Define some device constants
LCD_WIDTH = 16		# Maximum characters per line
LCD_CHR = True
LCD_CMD = False

LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line

# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005

def main():
	# Main program block
#	gpio.setwarnings(False)
	gpio.init()											# Use BCM gpio.numbers
	gpio.setcfg(LCD_E, gpio.OUTPUT)	# E
	gpio.setcfg(LCD_RS, gpio.OUTPUT) # RS
	gpio.setcfg(LCD_D4, gpio.OUTPUT) # DB4
	gpio.setcfg(LCD_D5, gpio.OUTPUT) # DB5
	gpio.setcfg(LCD_D6, gpio.OUTPUT) # DB6
	gpio.setcfg(LCD_D7, gpio.OUTPUT) # DB7

	# Initialise display
	lcd_init()

	while True:

		# Send some test
		lcd_string("Rasbperry Pi",LCD_LINE_1)
		lcd_string("16x2 LCD Test",LCD_LINE_2)

		time.sleep(3) # 3 second delay

		# Send some text
		lcd_string("1234567890123456",LCD_LINE_1)
		lcd_string("abcdefghijklmnop",LCD_LINE_2)

		time.sleep(3) # 3 second delay

		# Send some text
		lcd_string("RaspberryPi-spy",LCD_LINE_1)
		lcd_string(".co.uk",LCD_LINE_2)

		time.sleep(3)

		# Send some text
		lcd_string("Follow me on",LCD_LINE_1)
		lcd_string("Twitter @RPiSpy",LCD_LINE_2)

		time.sleep(3)

def lcd_init():
	# Initialise display
	lcd_byte(0x33,LCD_CMD) # 110011 Initialise
	lcd_byte(0x32,LCD_CMD) # 110010 Initialise
	lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction
	lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off
	lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size
	lcd_byte(0x01,LCD_CMD) # 000001 Clear display
	time.sleep(E_DELAY)

def lcd_byte(bits, mode):
	# Send byte to data pins
	# bits = data
	# mode = True	for character
	#				False for command

	gpio.output(LCD_RS, mode) # RS

	# High bits
	gpio.output(LCD_D4, False)
	gpio.output(LCD_D5, False)
	gpio.output(LCD_D6, False)
	gpio.output(LCD_D7, False)
	if bits&0x10==0x10:
		gpio.output(LCD_D4, True)
	if bits&0x20==0x20:
		gpio.output(LCD_D5, True)
	if bits&0x40==0x40:
		gpio.output(LCD_D6, True)
	if bits&0x80==0x80:
		gpio.output(LCD_D7, True)

	# Toggle 'Enable' pin
	lcd_toggle_enable()

	# Low bits
	gpio.output(LCD_D4, False)
	gpio.output(LCD_D5, False)
	gpio.output(LCD_D6, False)
	gpio.output(LCD_D7, False)
	if bits&0x01==0x01:
		gpio.output(LCD_D4, True)
	if bits&0x02==0x02:
		gpio.output(LCD_D5, True)
	if bits&0x04==0x04:
		gpio.output(LCD_D6, True)
	if bits&0x08==0x08:
		gpio.output(LCD_D7, True)

	# Toggle 'Enable' pin
	lcd_toggle_enable()

def lcd_toggle_enable():
	# Toggle enable
	time.sleep(E_DELAY)
	gpio.output(LCD_E, True)
	time.sleep(E_PULSE)
	gpio.output(LCD_E, False)
	time.sleep(E_DELAY)

def lcd_string(message,line):
	# Send string to display

	message = message.ljust(LCD_WIDTH," ")

	lcd_byte(line, LCD_CMD)

	for i in range(LCD_WIDTH):
		lcd_byte(ord(message[i]),LCD_CHR)

if __name__ == '__main__':

	try:
		main()
	except KeyboardInterrupt:
		pass
	finally:
		lcd_byte(0x01, LCD_CMD)
		lcd_string("Goodbye!",LCD_LINE_1)
#		gpio.cleanup()