初始化提交

boards/default_src/micropython/origin/build/lib/i2clcd.py

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+"""
+LCD1602、LCD2004_I2C
+
+Micropython library for the I2C(LCD1602、LCD2004)
+=======================================================
+
+#Preliminary composition                20221117
+
+dahanzimin From the Mixly Team 
+"""
+from time import sleep_ms
+from micropython import const
+
+LCD_DAT     = const(0x01)               # Mode - Sending data
+LCD_CMD     = const(0x00)               # Mode - Sending command
+LCD_LINES   = (0x80, 0xC0, 0x94, 0xD4)
+
+class LCD():
+    def __init__(self, i2c_bus, i2c_addr=0x27, lcd_width=16):
+        self._device = i2c_bus
+        self._address = i2c_addr
+        self._lcd_width = lcd_width
+        self._backlight = True
+        self._last_data = 0x00
+
+        for i in [0x30, 0x30, 0x30,0x20]:
+            self._i2c_write(i)
+            sleep_ms(1)
+        for i in [0x28, 0x0C, 0x06]:
+            self.write_byte(i , LCD_CMD)
+        self.clear()
+
+    def _i2c_write(self, data , pulse_en=True):
+        """write one byte to I2C bus"""
+        self._last_data = data
+        self._device.writeto(self._address,data.to_bytes(1, 'little'))
+        sleep_ms(0)
+        if pulse_en :
+            self._device.writeto(self._address,(data | 0b00000100).to_bytes(1, 'little'))
+            sleep_ms(0)
+            self._device.writeto(self._address,(data & ~0b00000100).to_bytes(1, 'little'))
+            sleep_ms(0)
+
+    def write_byte(self, data, mode):
+        """write one byte to LCD"""
+        data_H = (data & 0xF0) | self._backlight * 0x08 | mode
+        data_L = ((data << 4) & 0xF0) | self._backlight * 0x08 | mode
+        self._i2c_write(data_H)
+        self._i2c_write(data_L)
+
+    def clear(self):
+        """Clear the display and reset the cursor position"""
+        self.write_byte(0x01, LCD_CMD)
+        sleep_ms(1)
+
+    def backlight(self, on_off):
+        """ Set whether the LCD backlight is on or off"""
+        self._backlight = on_off & 0x01
+        i2c_data = (self._last_data & 0xF7) + self._backlight * 0x08
+        self._i2c_write(i2c_data,pulse_en=False)
+
+    def shows(self, text, line=0, column=0, center=False):
+        '''Character display'''
+        text = str(text).encode('ascii')
+        column=(self._lcd_width-len(text))//2 if center else column
+        self.write_byte(LCD_LINES[line] + column, LCD_CMD)
+        for b in text:
+            self.write_byte(0x0C+0*0x02+0*0x01, LCD_CMD)
+            self.write_byte(b, LCD_DAT)
+
+    def print(self, text, line=0, column=0, delay=500):
+        '''Print Effect Character Display'''
+        text = str(text).encode('ascii')
+        self.write_byte(LCD_LINES[line] + column, LCD_CMD)
+        for b in text:
+            self.write_byte(0x0C+1*0x02+1*0x01, LCD_CMD)
+            sleep_ms(delay)
+            self.write_byte(b, LCD_DAT)
+        sleep_ms(delay)