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display.py

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+import machine
+import st7789py as st7789
+from config import CURRENT_CONFIG
+
+class Display:
+    def __init__(self):
+        self.tft = None
+        self.width = 240
+        self.height = 240
+        self._init_display()
+
+    def _init_display(self):
+        print(">>> Initializing Display...")
+        try:
+            pins = CURRENT_CONFIG.pins
+            spi = machine.SPI(2, baudrate=40000000, polarity=1, phase=1, 
+                              sck=machine.Pin(pins['sck']), mosi=machine.Pin(pins['mosi']))
+            
+            cs_pin = pins.get('cs')
+            cs = machine.Pin(cs_pin, machine.Pin.OUT) if cs_pin is not None else None
+            
+            rst_pin = pins.get('rst')
+            dc_pin = pins.get('dc')
+            
+            self.tft = st7789.ST7789(spi, self.width, self.height, 
+                                    reset=machine.Pin(rst_pin, machine.Pin.OUT) if rst_pin else None,
+                                    dc=machine.Pin(dc_pin, machine.Pin.OUT) if dc_pin else None,
+                                    cs=cs,
+                                    backlight=None)
+            self.tft.init()
+            self.tft.fill(st7789.BLUE)
+        except Exception as e:
+            print(f"Display error: {e}")
+            self.tft = None
+
+    def fill(self, color):
+        if self.tft:
+            self.tft.fill(color)
+
+    def fill_rect(self, x, y, w, h, color):
+        if self.tft:
+            self.tft.fill_rect(x, y, w, h, color)
+
+    def init_ui(self):
+        """初始化 UI 背景"""
+        if self.tft:
+            self.tft.fill(st7789.BLACK)
+            self.tft.fill_rect(0, 0, 240, 30, st7789.WHITE)
+
+    def update_audio_bar(self, bar_height, last_bar_height):
+        """更新音频可视化的柱状图"""
+        if not self.tft: return last_bar_height
+
+        # 确定当前颜色
+        color = st7789.GREEN
+        if bar_height > 50: color = st7789.YELLOW
+        if bar_height > 100: color = st7789.RED
+        
+        # 确定上一次颜色
+        last_color = st7789.GREEN
+        if last_bar_height > 50: last_color = st7789.YELLOW
+        if last_bar_height > 100: last_color = st7789.RED
+        
+        # 1. 如果变矮了，清除顶部多余部分
+        if bar_height < last_bar_height:
+            self.tft.fill_rect(100, 240 - last_bar_height, 40, last_bar_height - bar_height, st7789.BLACK)
+        
+        # 2. 如果颜色变了，必须重绘整个条
+        if color != last_color:
+            self.tft.fill_rect(100, 240 - bar_height, 40, bar_height, color)
+        # 3. 如果颜色没变且变高了，只绘新增部分
+        elif bar_height > last_bar_height:
+            self.tft.fill_rect(100, 240 - bar_height, 40, bar_height - last_bar_height, color)
+            
+        return bar_height