LCD1602两行右移显示

你可以使用以下代码将LCD1602右移两行显示：

import time
import RPi.GPIO as GPIO

# Define GPIO to LCD mapping
LCD_RS = 7
LCD_E  = 8
LCD_D4 = 25
LCD_D5 = 24
LCD_D6 = 23
LCD_D7 = 18

# Define some device constants
LCD_WIDTH = 16    # Maximum characters per line

# Define some device commands
LCD_CLEAR_DISPLAY = 0x01
LCD_RETURN_HOME = 0x02
LCD_ENTRY_MODE_SET = 0x04
LCD_DISPLAY_ON_OFF_CONTROL = 0x08
LCD_CURSOR_DISPLAY_SHIFT = 0x10
LCD_FUNCTION_SET = 0x20
LCD_SET_CGRAM_ADDRESS = 0x40
LCD_SET_DDRAM_ADDRESS = 0x80

# Define some LCD entry mode flags
LCD_ENTRY_RIGHT = 0x00
LCD_ENTRY_LEFT = 0x02
LCD_ENTRY_SHIFT_INCREMENT = 0x01
LCD_ENTRY_SHIFT_DECREMENT = 0x00

# Define some LCD display on/off control flags
LCD_DISPLAY_ON = 0x04
LCD_DISPLAY_OFF = 0x00
LCD_CURSOR_ON = 0x02
LCD_CURSOR_OFF = 0x00
LCD_BLINK_ON = 0x01
LCD_BLINK_OFF = 0x00

# Define some LCD function set flags
LCD_8BIT_MODE = 0x10
LCD_4BIT_MODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10_DOTS = 0x04
LCD_5x8_DOTS = 0x00

def lcd_init():
  # Configure GPIO pins
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(LCD_E, GPIO.OUT)
  GPIO.setup(LCD_RS, GPIO.OUT)
  GPIO.setup(LCD_D4, GPIO.OUT)
  GPIO.setup(LCD_D5, GPIO.OUT)
  GPIO.setup(LCD_D6, GPIO.OUT)
  GPIO.setup(LCD_D7, GPIO.OUT)

  # Initialize display
  lcd_write(0x33, False) # 110011 Initialise
  lcd_write(0x32, False) # 110010 Initialise
  lcd_write(LCD_FUNCTION_SET | LCD_4BIT_MODE | LCD_2LINE | LCD_5x8_DOTS, False) # 001010 Function set
  lcd_write(LCD_DISPLAY_ON_OFF_CONTROL | LCD_DISPLAY_OFF, False) # 000010 Display off
  lcd_write(LCD_CLEAR_DISPLAY, False) # 000001 Clear display
  lcd_write(LCD_ENTRY_MODE_SET | LCD_ENTRY_LEFT | LCD_ENTRY_SHIFT_DECREMENT, False) # 000100 Entry mode set
  lcd_write(LCD_DISPLAY_ON_OFF_CONTROL | LCD_DISPLAY_ON | LCD_CURSOR_OFF | LCD_BLINK_OFF, False) # 000111 Display on

def lcd_write(bits, char_mode=False):
  # Set RS and D4-D7 pins
  GPIO.output(LCD_RS, char_mode)
  GPIO.output(LCD_D4, False)
  GPIO.output(LCD_D5, False)
  GPIO.output(LCD_D6, False)
  GPIO.output(LCD_D7, False)
  if bits&0x10==0x10:
    GPIO.output(LCD_D4, True)
  if bits&0x20==0x20:
    GPIO.output(LCD_D5, True)
  if bits&0x40==0x40:
    GPIO.output(LCD_D6, True)
  if bits&0x80==0x80:
    GPIO.output(LCD_D7, True)

  # Toggle 'Enable' pin
  time.sleep(0.0001)
  GPIO.output(LCD_E, True)
  time.sleep(0.0001)
  GPIO.output(LCD_E, False)
  time.sleep(0.0001)

  # Set D4-D7 pins
  GPIO.output(LCD_D4, False)
  GPIO.output(LCD_D5, False)
  GPIO.output(LCD_D6, False)
  GPIO.output(LCD_D7, False)
  if bits&0x01==0x01:
    GPIO.output(LCD_D4, True)
  if bits&0x02==0x02:
    GPIO.output(LCD_D5, True)
  if bits&0x04==0x04:
    GPIO.output(LCD_D6, True)
  if bits&0x08==0x08:
    GPIO.output(LCD_D7, True)

  # Toggle 'Enable' pin
  time.sleep(0.0001)
  GPIO.output(LCD_E, True)
  time.sleep(0.0001)
  GPIO.output(LCD_E, False)
  time.sleep(0.0001)

def lcd_display_string(message, line):
  # Send string to display
  message = message.ljust(LCD_WIDTH," ")

  lcd_write(LCD_SET_DDRAM_ADDRESS + line*0x40, False)
  for i in range(LCD_WIDTH):
    lcd_write(ord(message[i]),True)

if __name__ == '__main__':
  try:
    lcd_init()
    while True:
      lcd_display_string("Hello, World!", 0)
      lcd_display_string("Right Shifted", 1)
      time.sleep(2)
      for i in range(LCD_WIDTH):
        lcd_display_string(" "*i + "Right Shifted", 1)
        time.sleep(0.2)
      lcd_write(LCD_CLEAR_DISPLAY, False)
      time.sleep(1)
  except KeyboardInterrupt:
    pass
  finally:
    lcd_write(LCD_CLEAR_DISPLAY, False)
    lcd_write(LCD_DISPLAY_ON_OFF_CONTROL | LCD_DISPLAY_OFF, False)
    GPIO.cleanup()

这段代码使用了RPi.GPIO库来与树莓派的GPIO引脚进行交互，通过调用`lcd_display_string()`函数来在LCD1602上显示文本。在`lcd_display_string()`函数中，我们使用了`LCD_SET_DDRAM_ADDRESS`命令来设置LCD光标的位置，进而在指定的行上显示文本。

你可以将第15行的`LCD_D7`引脚连接到LCD1602的RS引脚上，第16行的`LCD_D6`引脚连接到LCD1602的E引脚上，第18至21行的`LCD_D4`至`LCD_D7`引脚分别连接到LCD1602的D4至D7引脚上。