93 lines
2.5 KiB
Python
93 lines
2.5 KiB
Python
"""
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液晶屏管理模块 - 单例模式实现
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提供液晶屏的统一初始化和管理接口，确保整个系统中只有一个液晶屏实例。
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适用于ESP8266等内存有限的平台。
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"""
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import gc
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import st7789
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class Display:
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"""液晶屏管理类 - 单例模式"""
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_instance = None
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_initialized = False
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def __new__(cls):
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"""单例模式实现"""
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if cls._instance is None:
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cls._instance = super(Display, cls).__new__(cls)
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return cls._instance
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def __init__(self):
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"""初始化液晶屏，只在第一次调用时执行"""
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if not self._initialized:
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self.tft = None
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self._backlight = None
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self._brightness = 80 # 默认亮度80%
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self._initialized = True
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def init_display(self):
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"""初始化液晶屏"""
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try:
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from machine import PWM, SPI, Pin
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# 初始化显示屏
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self.tft = st7789.ST7789(
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SPI(1, 40_000_000, polarity=1),
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240,
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240,
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dc=Pin(0, Pin.OUT),
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reset=Pin(2, Pin.OUT),
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buffer_size=0,
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)
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# 初始化PWM背光控制
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self._backlight = PWM(Pin(5), freq=1000)
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self.brightness(self._brightness)
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# 初始化并清屏
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self.tft.init()
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gc.collect()
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self.tft.fill(st7789.BLACK)
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print("液晶屏初始化成功")
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return True
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except Exception as e:
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print(f"液晶屏初始化失败: {e}")
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self.tft = None
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self._backlight = None
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return False
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def is_ready(self):
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"""检查液晶屏是否已初始化"""
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return self.tft is not None
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def driver(self):
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"""获取液晶屏对象"""
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return self.tft
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def clear(self, color=st7789.BLACK):
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"""清屏"""
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self.tft.fill(color)
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def show_jpg(self, filename, x=0, y=0, mode=st7789.FAST):
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"""显示JPG图片"""
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self.tft.jpg(filename, x, y, mode)
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def brightness(self, _brightness=-1):
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"""设置背光亮度 (0-100)"""
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if _brightness >= 0 and _brightness <= 100:
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# 将0-100范围映射到0-1023 (PWM占空比)
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duty = int(1023 * (100 - _brightness) / 100)
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self._backlight.duty(duty)
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self._brightness = _brightness
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return self._brightness
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# 全局液晶屏实例
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display = Display()
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