1. #!/usr/bin/env python3
    2. # -*- coding: utf-8 -*-
    3. # －－－－湖南创乐博智能科技有限公司－－－－
    4. #  文件名：LCD1602.py
    5. #  版本：V2.0
    6. #  author: zhulin
    7. # 说明：液晶显示器模块
    8. #####################################################
    9. import time
    10. import smbus
    12. makerobo_BUS = smbus.SMBus(1)
    14. # IIC LCD1602 液晶模块写入字
    15. def makerobo_write_word(addr, data):
    16.     global makerobo_BLEN
    17.     makerobo_temp = data
    18.     if makerobo_BLEN == 1:
    19.         makerobo_temp |= 0x08
    20.     else:
    21.         makerobo_temp &= 0xF7
    22.     makerobo_BUS.write_byte(addr ,makerobo_temp) # 设置IIC LCD1602 液晶模块地址
    24. # IIC LCD1602 发送命令
    25. def  makerobo_send_command(comm):
    26.     # 首先发送 bit7-4 位
    27.     lcd_buf = comm & 0xF0
    28.     lcd_buf |= 0x04               # RS = 0, RW = 0, EN = 1
    29.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    30.     time.sleep(0.002)
    31.     lcd_buf &= 0xFB               # Make EN = 0
    32.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    34.     # 其次发送 bit3-0 位
    35.     lcd_buf = (comm & 0x0F) << 4
    36.     lcd_buf |= 0x04               # RS = 0, RW = 0, EN = 1
    37.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    38.     time.sleep(0.002)
    39.     lcd_buf &= 0xFB               # Make EN = 0
    40.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    42. # IIC LCD1602 发送数据
    43. def makerobo_send_data(data):
    44.     # 首先发送 bit7-4 位
    45.     lcd_buf = data & 0xF0
    46.     lcd_buf |= 0x05               # RS = 1, RW = 0, EN = 1
    47.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    48.     time.sleep(0.002)
    49.     lcd_buf &= 0xFB               # Make EN = 0
    50.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    52.     # 其次发送 bit3-0 位
    53.     lcd_buf = (data & 0x0F) << 4
    54.     lcd_buf |= 0x05               # RS = 1, RW = 0, EN = 1
    55.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    56.     time.sleep(0.002)
    57.     lcd_buf &= 0xFB               # Make EN = 0
    58.     makerobo_write_word(LCD_ADDR ,lcd_buf)
    60. # IIC LCD1602 初始化
    61. def  makerobo_init(addr, bl):
    62.     global LCD_ADDR
    63.     global makerobo_BLEN
    64.     LCD_ADDR = addr
    65.     makerobo_BLEN = bl
    66.     try:
    67.         makerobo_send_command(0x33) # 必须先初始化到8线模式
    68.         time.sleep(0.005)
    69.         makerobo_send_command(0x32) # 然后初始化为4行模式
    70.         time.sleep(0.005)
    71.         makerobo_send_command(0x28) # 2 行 & 5*7 点位
    72.         time.sleep(0.005)
    73.         makerobo_send_command(0x0C) # 启用无光标显示
    74.         time.sleep(0.005)
    75.         makerobo_send_command(0x01) # 清除显示
    76.         makerobo_BUS.write_byte(LCD_ADDR, 0x08)
    77.     except:
    78.         return False
    79.     else:
    80.         return True
    82. # LCD 1602 清空显示函数
    83. def makerobo_clear():
    84.     makerobo_send_command(0x01)  # 清除显示
    86. # LCD 1602 使能背光显示
    87. def makerobo_openlight():  
    88.     makerobo_BUS.write_byte(0x27,0x08)  # 使能背光显示命令
    89.     makerobo_BUS.close()                # 关闭总线
    91. # LCD 1602 显示函数
    92. def makerobo_write(lcd_x, lcd_y, lcd_str):
    93.     # 选择行与列
    94.     if lcd_x < 0:
    95.         lcd_x = 0
    96.     if lcd_x > 15:
    97.         lcd_x = 15
    98.     if lcd_y <0:
    99.         lcd_y = 0
    100.     if lcd_y > 1:
    101.         lcd_y = 1
    103.     # 移动光标
    104.     lcd_addr = 0x80 + 0x40 * lcd_y + lcd_x
    105.     makerobo_send_command(lcd_addr)    # 发送地址
    107.     for chr in lcd_str:                  # 获取字符串长度
    108.         makerobo_send_data(ord(chr)) # 发送显示
    110. # 程序入口
    111. if __name__ == '__main__':
    112.     makerobo_init(0x27, 1)          # 初始化显示屏
    113.     makerobo_write(4, 0, 'Hello')   # 在第一行显示Hello
    114.     makerobo_write(7, 1, 'world!')  # 在第二行显示world!