-
Notifications
You must be signed in to change notification settings - Fork 0
/
TCN_lcd.py
267 lines (214 loc) · 6.99 KB
/
TCN_lcd.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
# Credit for this code goes to "natbett" of the Raspberry Pi Forum 18/02/13
# https://www.raspberrypi.org/forums/viewtopic.php?t=34261&p=378524
# Before running this code make sure to run sudo i2cdetect -y 1
# and match the LCD address of your device
#import smbus
#from time import *
# LCD Address
#ADDRESS = 0x3f
# commands
#LCD_CLEARDISPLAY = 0x01
#LCD_RETURNHOME = 0x02
#LCD_ENTRYMODESET = 0x04
#LCD_DISPLAYCONTROL = 0x08
#LCD_CURSORSHIFT = 0x10
#LCD_FUNCTIONSET = 0x20
#LCD_SETCGRAMADDR = 0x40
#LCD_SETDDRAMADDR = 0x80
# 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
#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
# flags for backlight control
#LCD_BACKLIGHT = 0x08
#LCD_NOBACKLIGHT = 0x00
#En = 0b00000100 # Enable bit
#Rw = 0b00000010 # Read/Write bit
#Rs = 0b00000001 # Register select bit
#class i2c_device:
# def __init__(self, addr, port=1):
# self.addr = addr
# self.bus = smbus.SMBus(port)
# Write a single command
# def write_cmd(self, cmd):
# self.bus.write_byte(self.addr, cmd)
# sleep(0.0001)
#class lcd:
#initializes objects and lcd
# def __init__(self):
# self.lcd_device = i2c_device(ADDRESS)
# self.lcd_write(0x03)
# self.lcd_write(0x03)
# self.lcd_write(0x03)
# self.lcd_write(0x02)
# self.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)
# self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)
# self.lcd_write(LCD_CLEARDISPLAY)
# self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)
#sleep(0.0001)
# clocks EN to latch command
# def lcd_strobe(self, data):
# self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)
#sleep(.0005)
# self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))
#sleep(.0001)
# def lcd_write_four_bits(self, data):
# self.lcd_device.write_cmd(data | LCD_BACKLIGHT)
# self.lcd_strobe(data)
# write a command to lcd
# def lcd_write(self, cmd, mode=0):
# self.lcd_write_four_bits(mode | (cmd & 0xF0))
# self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))
# put string function
# def lcd_display_string(self, string, line):
# if line == 1:
# self.lcd_write(0x80)
# if line == 2:
# self.lcd_write(0xC0)
# if line == 3:
# self.lcd_write(0x94)
# if line == 4:
# self.lcd_write(0xD4)
# for char in string:
# self.lcd_write(ord(char), Rs)
# clear lcd and set to home
# def lcd_clear(self):
# self.lcd_write(LCD_CLEARDISPLAY)
# self.lcd_write(LCD_RETURNHOME)
#def show_string(string,line = 1):
# l = lcd()
# if type(string) != str:
# print("wrong input type , input must be 'string'")
# else:
# l.lcd_display_string(string,line)
#def clear():
# l = lcd()
# l.lcd_clear()
#display = lcd()
#display.lcd_display_string("RaspiNews - 16x2", 1)
#display.lcd_display_string("I2C LCD Demo..", 2)
#!/usr/bin/python
#--------------------------------------
# ___ ___ _ ____
# / _ \/ _ \(_) __/__ __ __
# / , _/ ___/ /\ \/ _ \/ // /
# /_/|_/_/ /_/___/ .__/\_, /
# /_/ /___/
#
# lcd_i2c.py
# LCD test script using I2C backpack.
# Supports 16x2 and 20x4 screens.
#
# Author : Matt Hawkins
# Date : 20/09/2015
#
# http://www.raspberrypi-spy.co.uk/
#
# Copyright 2015 Matt Hawkins
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#--------------------------------------
import smbus
import time
# Define some device parameters
I2C_ADDR = 0x3f # I2C device address
LCD_WIDTH = 16 # Maximum characters per line
# Define some device constants
LCD_CHR = 1 # Mode - Sending data
LCD_CMD = 0 # Mode - Sending command
LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line
LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line
LCD_BACKLIGHT = 0x08 # On
#LCD_BACKLIGHT = 0x00 # Off
ENABLE = 0b00000100 # Enable bit
# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005
#Open I2C interface
#bus = smbus.SMBus(0) # Rev 1 Pi uses 0
bus = smbus.SMBus(1) # Rev 2 Pi uses 1
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 = the data
# mode = 1 for data
# 0 for command
bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT
bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT
# High bits
bus.write_byte(I2C_ADDR, bits_high)
lcd_toggle_enable(bits_high)
# Low bits
bus.write_byte(I2C_ADDR, bits_low)
lcd_toggle_enable(bits_low)
def lcd_toggle_enable(bits):
# Toggle enable
time.sleep(E_DELAY)
bus.write_byte(I2C_ADDR, (bits | ENABLE))
time.sleep(E_PULSE)
bus.write_byte(I2C_ADDR,(bits & ~ENABLE))
time.sleep(E_DELAY)
def lcd_string(message,line): # line is either 1 or 2 for us
# 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)
#=========== Example function ==============
def main():
# Main program block
# Initialise display
lcd_init()
while True:
# Send some test
lcd_string("RPiSpy <",LCD_LINE_1)
lcd_string("I2C LCD <",LCD_LINE_2)
time.sleep(3)
# Send some more text
lcd_string("> RPiSpy",LCD_LINE_1)
lcd_string("> I2C LCD",LCD_LINE_2)
time.sleep(3)
if __name__ == '__main__':
main()