132 lines
4.1 KiB
Python
132 lines
4.1 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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self.en_font = '/rom/fonts/en-8x16.rfont'
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self.cn_font = '/rom/fonts/cn-22x24.bfont'
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self.vector_font = '/rom/fonts/en-32x32.hfont'
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# 前景色、背景色、提示框背景色
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self._COLORS = (0xFE19, 0x0000, 0x7800)
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def init_display(self, bl_pwm=True, buffer_size=2048):
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"""初始化液晶屏，默认2048够用且不易有内存碎片"""
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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=buffer_size,
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)
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# 初始化PWM背光控制
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if bl_pwm:
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self._backlight = PWM(Pin(5), freq=1000)
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else:
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self._backlight = Pin(5, Pin.OUT)
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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 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.SLOW):
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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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from machine import PWM
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if type(self._backlight) == PWM: # pwm设备
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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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elif _brightness == 0: # 关闭背光
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self._backlight.on()
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else: # 打开背光
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self._backlight.off()
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_brightness = 100
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self._brightness = _brightness
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return self._brightness
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def message(self, msg, x=10, y=10, fg=st7789.WHITE, bg=st7789.BLACK):
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self.tft.text(self.en_font, msg, x, y, fg, bg)
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def window(self, title=None, content=None, info=None):
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C_FG,C_BG,C_BT = self._COLORS
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self.tft.fill(C_BG)
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self.tft.rect(8, 8, 224, 224, C_FG)
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self.tft.fill_rect(9, 9, 222, 40, C_BT)
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self.tft.hline(9, 48, 222, C_FG)
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self.tft.fill_rect(9, 192, 222, 39, C_BT)
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self.tft.hline(9, 192, 222, C_FG)
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if title:
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self.tft.write(self.cn_font, title, 19, 17, C_FG, C_BT)
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if info:
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self.tft.text(self.en_font, info, 19, 204, C_FG, C_BT)
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for i, line in enumerate(content):
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if line:
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self.tft.write(self.cn_font, line, 19, 68+i*28, C_FG, C_BG)
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def portal_win(self, ssid):
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tips = [
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"> 连接热点:",
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f"> {ssid}",
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"",
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"> 自动进入配置页面",
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]
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self.window("配置设备网络连接", tips, "portal ip: 192.168.4.1")
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# 全局液晶屏实例
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display = Display()
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