【树莓派教程】——I2c驱动 1602 LCD DF创客社区

凌风清羽 发表于 2016-1-9 14:31:17

【树莓派教程】——I2c驱动 1602 LCD

本帖最后由凌风清羽于 2016-1-25 20:00 编辑

1.1602LCD 就是16（字符）x2(行)
2.树莓派默认I2c是关闭的，在/dev 中我们不能发现设备
vi /etc/modprobe.d/raspi-blacklist.conf
# blacklist spi and i2c by default (many users don't need them)
#blacklist spi-bcm2708
#blacklist i2c-bcm2708注释掉代表使用
vi/etc/modules
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

snd-bcm2835
i2c-bcm2708
i2c-dev
3.查看设备
lsmod

4.安装工具
apt-get install i2c-tools python-smbus
5.查看设备地址
i2cdetect -y 1
设备地址就是0x27
6示例代码logx.py
import logging
#print on log file
logging.basicConfig(level=logging.INFO,
            format='%(asctime)s <%(levelname)s> %(filename)s : %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S',
            filename='trace.log',
            filemode='a')#w a
#print on screem
console = logging.StreamHandler()
console.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s <%(levelname)s> %(filename)s : %(message)s')
console.setFormatter(formatter)
logging.getLogger('').addHandler(console)
if __name__ == '__main__':
   #CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET
   logging.critical('This is critical message')
   logging.error('This is error message')
   logging.warning('This is warning message')
   logging.info('This is info message')
   logging.debug('This is debug message')
   #logging.notset('This is notset message')

LCD1602.py
import time
import smbus
import logx
import logging
BUS = smbus.SMBus(1)
LCD_ADDR = 0x27
BLEN = 1 #turn on/off background light

def turn_light(key):
   global BLEN
   BLEN = key
   if key ==1 :
            BUS.write_byte(LCD_ADDR ,0x08)
            logging.info('LCD executed turn on BLight')
   else:
            BUS.write_byte(LCD_ADDR ,0x00)
            logging.info('LCD executed turn off BLight')

def write_word(addr, data):
   global BLEN
   temp = data
   if BLEN == 1:
            temp |= 0x08
   else:
            temp &= 0xF7
   BUS.write_byte(addr ,temp)

def send_command(comm):
   # Send bit7-4 firstly
   buf = comm & 0xF0
   buf |= 0x04             # RS = 0, RW = 0, EN = 1
   write_word(LCD_ADDR ,buf)
   time.sleep(0.002)
   buf &= 0xFB             # Make EN = 0
   write_word(LCD_ADDR ,buf)

   # Send bit3-0 secondly
   buf = (comm & 0x0F) << 4
   buf |= 0x04             # RS = 0, RW = 0, EN = 1
   write_word(LCD_ADDR ,buf)
   time.sleep(0.002)
   buf &= 0xFB             # Make EN = 0
   write_word(LCD_ADDR ,buf)

def send_data(data):
   # Send bit7-4 firstly
   buf = data & 0xF0
   buf |= 0x05             # RS = 1, RW = 0, EN = 1
   write_word(LCD_ADDR ,buf)
   time.sleep(0.002)
   buf &= 0xFB             # Make EN = 0
   write_word(LCD_ADDR ,buf)

   # Send bit3-0 secondly
   buf = (data & 0x0F) << 4
   buf |= 0x05             # RS = 1, RW = 0, EN = 1
   write_word(LCD_ADDR ,buf)
   time.sleep(0.002)
   buf &= 0xFB             # Make EN = 0
   write_word(LCD_ADDR ,buf)

def init_lcd():
   try:
            send_command(0x33) # Must initialize to 8-line mode at first
            time.sleep(0.005)
            send_command(0x32) # Then initialize to 4-line mode
            time.sleep(0.005)
            send_command(0x28) # 2 Lines & 5*7 dots
            time.sleep(0.005)
            send_command(0x0C) # Enable display without cursor
            time.sleep(0.005)
            send_command(0x01) # Clear Screen
            logging.info('LCD init over')
            BUS.write_byte(LCD_ADDR ,0x08)
            logging.info('LCD turning on BLight')
   except:
            return False
   else:
            return True

def clear_lcd():
   send_command(0x01) # Clear Screen

def print_lcd(x, y, str):
   if x < 0:
            x = 0
   if x > 15:
            x = 15
   if y <0:
            y = 0
   if y > 1:
            y = 1

   # Move cursor
   addr = 0x80 + 0x40 * y + x
   send_command(addr)

   for chr in str:
            send_data(ord(chr))

if __name__ == '__main__':
   init_lcd()
   print_lcd(0, 0, 'Hello, DFRobot！！！')
   print_lcd(8, 1, 'By lingfeng')

lcdtest.py
#!/user/bin/env python

import smbus
import time
import sys
import LCD1602 as LCD
import logx
import logging

if __name__ == '__main__':
   LCD.init_lcd()
   time.sleep(2)
   LCD.print_lcd(0,0,'Hello DFRobot！')
   LCD.print_lcd(1,1,'local time')
   logging.info('wait 2 seconds')
   LCD.turn_light(1)
   logging.info('turn on Light')
   time.sleep(5)
   while True:
            nowtime = time.strftime('%m-%d %H:%M:%S',time.localtime(time.time()))
            hourtime = time.strftime('%H',time.localtime(time.time()))
            mintime = time.strftime('%M',time.localtime(time.time()))
            sectime = time.strftime('%S',time.localtime(time.time()))
            LCD.print_lcd(1,1,nowtime)
            if mintime == '59':
                     if sectime == '00':
                           LCD.turn_light(1)
                     elif sectime== '59':
                           LCD.turn_light(0)
            time.sleep(1)

上图难，上图难于上青天~~~网速好了再发图

凌风清羽 发表于 2016-1-9 15:14:29

想问一下大家发帖的时候图片上传的速度怎么样~~~

dsweiliang 发表于 2016-1-9 15:54:22

图挂了

孙毅发表于 2016-1-9 16:36:53

图片看不到啊。。。。我上传的时候，速度还能接受啊，就是有时候自己拍的照片大小可能会超过限制，得自己找软件重新保存下才行。

孙毅发表于 2016-1-9 16:40:23

另外，你的1602的屏幕什么样子，我最近买了几个 IIC的 OLED，点亮进行中。。。

凌风清羽 发表于 2016-1-9 16:42:19

孙毅发表于 2016-1-9 16:40
另外，你的1602的屏幕什么样子，我最近买了几个 IIC的 OLED，点亮进行中。。。 ...

上不了图啊，就是DF那款，只是单独拆下来的1602 ，最便宜的那种
https://www.dfrobot.com.cn/goods-372.html

孙毅发表于 2016-1-9 16:45:01

凌风清羽发表于 2016-1-9 16:42
上不了图啊，就是DF那款，只是单独拆下来的1602 ，最便宜的那种
https://www.dfrobot.com.cn/goods-372.ht ...

哦哦哦~~~了解了 {:5_168:}

凌风清羽 发表于 2016-1-9 17:35:32

吼吼吼，终于有图了~~~

凌风清羽 发表于 2016-1-9 17:37:53

以后无论是拍照还是截图都要留出给DF放水印的位置

凌风清羽 发表于 2016-1-9 17:37:55

以后无论是拍照还是截图都要留出给DF放水印的位置

dsweiliang 发表于 2016-1-9 20:18:01

能显示中文么

大连林海 发表于 2016-1-9 20:41:50

{:5_182:}

凌风清羽 发表于 2016-1-9 22:27:29

dsweiliang 发表于 2016-1-9 20:18
能显示中文么

没有中文字库啊{:5_195:}

dsweiliang 发表于 2016-1-10 12:31:39

凌风清羽发表于 2016-1-9 22:27
没有中文字库啊

有字库就行？

凌风清羽 发表于 2016-1-10 14:58:33

dsweiliang 发表于 2016-1-10 12:31
有字库就行？

当道理上是这样的，我下次可以发一个自定义显示图形的帖子

凌风清羽 发表于 2016-1-10 14:58:34

dsweiliang 发表于 2016-1-10 12:31
有字库就行？

当道理上是这样的，我下次可以发一个自定义显示图形的帖子

丄帝De咗臂 发表于 2016-1-10 19:58:44

这么多代码呢

Ash 发表于 2016-1-11 15:48:16

凌风清羽发表于 2016-1-9 17:37
以后无论是拍照还是截图都要留出给DF放水印的位置
哈哈哈哈悟出经验了 {:5_198:}

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【树莓派教程】——I2c驱动 1602 LCD