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• #22527 SomaSom551 újonc

  Új Válasz 2016-09-02 16:27:50 #22527

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  SomaSom551

  újonc

  Sziasztok!
  Vettem egy 16x2 LCD-t A Raspberry Pi 2-hez és ebben kéne segítenetek,
  na szóval az lenne a probléma hogy I2C-vel akarom megcsinálni tehát I2C-interfészt használnék és minden kébelt jól dugtam be, kipróbáltam működike ezzel a kóddal: (python)
  #!/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 = 0x27 # 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):
# 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)

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__':

try:
main()
except KeyboardInterrupt:
pass
finally:
lcd_byte(0x01, LCD_CMD)

  De valamiért nem működött később rá jöttem hogy azt írta a kódba át kell írni a GPIO mappingot de ezt nem tudom hogy kell, ha valaki tud kérem segítsen!
  Ha modellszám kell írjatok!
  Előre is köszi!
  (L:/dl/upc/2016-09/02/593104_ti2tcfomncifhdxc_img_20160902_160913_1.jpg)[kép](/L)
  (L:/dl/upc/2016-09/02/593104_ovcfiwxiisfds4qy_img_20160902_160927_1.jpg)[kép](/L)
  [kép]

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