HD44780_sys_1.py 文件源码

def __init__(self):

        if gv.SYSTEM_MODE == 1 and (gv.USE_HD44780_16x2_LCD or gv.USE_HD44780_20x4_LCD):

            # Timing constants
            self.E_PULSE = 0.0005
            self.E_DELAY = 0.0005

            self.display_called = False
            self.temp_display = False

            if gv.IS_DEBIAN:
                self.thread_sleep = 0.05
            else:
                self.thread_sleep = 0.1

            self.timeout_init = 2  # default timeout reset time
            self.timeout_length = self.timeout_init  # initial timeout length (timeout_custom will override)

            self.STRING_1 = ''
            self.STRING_2 = ''
            self.STRING_3 = ''
            self.STRING_4 = ''
            self.STRING_1_PRIORITY = ''
            self.STRING_2_PRIORITY = ''
            self.STRING_3_PRIORITY = ''
            self.STRING_4_PRIORITY = ''

            self.loop_alive = True

            if gv.IS_DEBIAN:
                import RPi.GPIO as GPIO
                from RPLCD import CursorMode
                from RPLCD import CharLCD

                self.lcd = CharLCD(pin_rs=gv.GPIO_LCD_RS, pin_rw=None, pin_e=gv.GPIO_LCD_E,
                                   pins_data=[gv.GPIO_LCD_D4, gv.GPIO_LCD_D5, gv.GPIO_LCD_D6, gv.GPIO_LCD_D7],
                                   numbering_mode=GPIO.BCM, cols=gv.LCD_COLS, rows=gv.LCD_ROWS, charmap='A00')

                self.lcd.clear()

                # Hide the cursor
                self.lcd._set_cursor_mode(CursorMode.hide)

                # Fill the display with blank spaces
                for i in xrange(1, gv.LCD_ROWS+1):
                    self.lcd_string(' ', i)

                # Write custom codes to the LCD
                self.lcd.create_char(1, lcdcc.block)
                self.lcd.create_char(2, lcdcc.pause)
                self.lcd.create_char(3, lcdcc.voice_button_on)
                self.lcd.create_char(4, lcdcc.voice_button_off)
                self.lcd.create_char(5, lcdcc.block2)
                self.lcd.create_char(6, lcdcc.loading_hour_glass)

        self.LCDThread = threading.Thread(target=self.lcd_main)
        self.LCDThread.daemon = True
        self.LCDThread.start()