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lcd.py
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#!/usr/bin/env python
import A20_GPIO as GPIO
from time import sleep
#from PIL import Image
from font import default_FONT
import struct
# Some constants / parameter
SEND_CHR = 1
SEND_CMD = 2
X_RANGE = 84
Y_RANGE = 48
DEFAULT_CONTRAST = 0xC0
LCD_CACHE_SIZE = X_RANGE*Y_RANGE/8
LCD_Memory = [0 for i in range(LCD_CACHE_SIZE)]
LCD_TEMP = [0 for i in range(X_RANGE)],[0 for i in range(Y_RANGE)]
GPIO.init();
pin_CS = GPIO.PIN_PI16 # SPI1-CS
pin_MOSI = GPIO.PIN_PI18 #SPI1- MOSI
pin_MISO = GPIO.PIN_PI19 #SPI1 MISO
pin_CLK = GPIO.PIN_PI17 #SPI1 CLK
pin_RST = GPIO.PIN_PB18 #UEXT PIN 5 LCD RESET
pin_DC = GPIO.PIN_PB19 #UEXT PIN 6 LCD DC
GPIO.setcfg(pin_CS,GPIO.OUTPUT) # SPI1-CS
GPIO.setcfg(pin_MOSI,GPIO.OUTPUT) #SPI1- MOSI
GPIO.setcfg(pin_MISO,GPIO.INPUT) #SPI1 MISO
GPIO.setcfg(pin_CLK,GPIO.OUTPUT) #SPI1 CLK
GPIO.setcfg(pin_RST,GPIO.OUTPUT) #UEXT PIN 5 LCD RESET
GPIO.setcfg(pin_DC,GPIO.OUTPUT) #UEXT PIN 6 LCD DC
def send(cmd,type):
GPIO.output(pin_CS, GPIO.LOW)
if(type == SEND_CHR):
GPIO.output(pin_DC, GPIO.HIGH)
else:
GPIO.output(pin_DC, GPIO.LOW)
SPIsendByte(cmd)
GPIO.output(pin_CS, GPIO.HIGH)
def SPIsendByte(byteTosend):
i = 0
for i in range(1,9):
if (byteTosend & 0x80):
GPIO.output(pin_MOSI, GPIO.HIGH)
else:
GPIO.output(pin_MOSI, GPIO.LOW)
#sleep(0.00001)
GPIO.output(pin_CLK, GPIO.LOW)
#sleep(0.00001)
GPIO.output(pin_CLK, GPIO.HIGH)
byteTosend = byteTosend << 1
return
def update():
x = 0
y = 0
for y in range(0,Y_RANGE/8):
send(0x80,SEND_CMD)
# send(0x40 | y, SEND_CMD)
send(0x40 | (y+1), SEND_CMD)
for x in range(X_RANGE):
send(LCD_Memory[y*X_RANGE + x],SEND_CHR)
def clear():
for i in range(len(LCD_Memory)):
LCD_Memory[i]=0
def drawPoint(x,y):
row = y/8
i = x + row * 84
LCD_Memory[i] |= 1 << (y % 8)
def drawLine(x1,y1,x2,y2):
dx=abs(x2-x1)
dy=abs(y2-y1)
if(x1 < x2): sx=1
else: sx=-1
if(y1 < y2): sy=1
else: sy=-1
err=dx-dy
while(1):
drawPoint(x1,y1)
if((x1==x2) & (y1==y2)):
break
e2 = 2*err
if(e2 > -dy):
err = err-dy
x1 = x1+sx
if(e2 < dx):
err=err+dx
y1=y1+sy
def drawRect(x1,y1,x2,y2):
drawLine(x1,y1,x1,y2)
drawLine(x1,y1,x2,y1)
drawLine(x2,y1,x2,y2)
drawLine(x1,y2,x2,y2)
def setContrast(contrast):
send(0x21,SEND_CMD)
send(0x14,SEND_CMD)
send(contrast,SEND_CMD)
send(0x20,SEND_CMD)
send(0x0C,SEND_CMD)
def write(string):
font = default_FONT
i=0
for i in string:
tmp = font[i]
for x in tmp:
send(x,SEND_CHR)
def chrXY(x, y, chr):
index=0
offset=0
i=0
font = default_FONT
if(x > X_RANGE): return
if(y > Y_RANGE): return
index=x*6+y*84
for i in range(6):
if(i==5):
LCD_Memory[index]=0
break
offset = font[chr][i]
LCD_Memory[index]=offset
index= index +1
def str(row,string):
x = 0
for i in string:
chrXY(x,row,i)
x=x+1
#update()
# Reset LCD
def init():
# SET CS HIGH
GPIO.output(pin_CS, GPIO.HIGH)
#Reset LCD
GPIO.output(pin_RST, GPIO.LOW)
sleep(1)
GPIO.output(pin_RST, GPIO.HIGH)
sleep(1)
send(0x21,SEND_CMD)
send(0xC8,SEND_CMD)
send(0x04,SEND_CMD)
send(0x40,SEND_CMD)
send(0x12,SEND_CMD)
send(0xE4,SEND_CMD)# Set Display offset line 1
send(0x45,SEND_CMD)# Set Display offset line 2: shiftet 5 pixels up and then use lines 1 to 6
send(0x20,SEND_CMD)
send(0x08,SEND_CMD)
send(0x0C,SEND_CMD)
setContrast(DEFAULT_CONTRAST)
clear()
update()