Sending updates to external screen + RGB LCD

2026-08-16 14:23:18 +02:00
parent 2276c1742a
commit fd00c9a89d
11 changed files with 367 additions and 24 deletions
@@ -0,0 +1,102 @@
+import time
+import sys
+from sensors.lock import grove_lock
+
+if sys.platform == 'uwp':
+    import winrt_smbus as smbus
+    bus = smbus.SMBus(1)
+else:
+    import smbus
+    import RPi.GPIO as GPIO
+    rev = GPIO.RPI_REVISION
+    if rev == 2 or rev == 3:
+        bus = smbus.SMBus(1)
+    else:
+        bus = smbus.SMBus(0)
+
+# Device I2C addresses
+DISPLAY_RGB_ADDR = 0x62
+DISPLAY_TEXT_ADDR = 0x3e
+
+
+def setRGB(r, g, b, brightness=1.0):
+    """Set backlight to (R,G,B) with optional brightness level (0.0 to 1.0)."""
+    brightness = max(0.0, min(1.0, float(brightness)))
+
+    r_scaled = int(max(0, min(255, r * brightness)))
+    g_scaled = int(max(0, min(255, g * brightness)))
+    b_scaled = int(max(0, min(255, b * brightness)))
+
+    with grove_lock:
+        try:
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 0, 0)
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 1, 0)
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 0x08, 0xaa)
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 4, r_scaled)
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 3, g_scaled)
+            bus.write_byte_data(DISPLAY_RGB_ADDR, 2, b_scaled)
+        except OSError:
+            pass
+
+
+def textCommand(cmd):
+    """Send command to display (internal use)."""
+    bus.write_byte_data(DISPLAY_TEXT_ADDR, 0x80, cmd)
+
+
+def setText(text):
+    """Set display text (\n for second line or auto wrap)."""
+    with grove_lock:
+        try:
+            textCommand(0x01)  # Clear display
+            time.sleep(0.05)
+            textCommand(0x08 | 0x04)  # Display on, no cursor
+            textCommand(0x28)  # 2 lines
+            time.sleep(0.05)
+            
+            count = 0
+            row = 0
+            for c in text:
+                if c == '\n' or count == 16:
+                    count = 0
+                    row += 1
+                    if row == 2:
+                        break
+                    textCommand(0xc0)
+                    if c == '\n':
+                        continue
+                count += 1
+                bus.write_byte_data(DISPLAY_TEXT_ADDR, 0x40, ord(c))
+                time.sleep(0.001)  # Small pacing delay to prevent LCD buffer overflow
+        except OSError:
+            pass
+
+
+def setText_norefresh(text):
+    """Update display text without full screen erase."""
+    with grove_lock:
+        try:
+            textCommand(0x02)  # Return home
+            time.sleep(0.05)
+            textCommand(0x08 | 0x04)  # Display on, no cursor
+            textCommand(0x28)  # 2 lines
+            time.sleep(0.05)
+            
+            count = 0
+            row = 0
+            while len(text) < 32:  # Clear rest of screen space
+                text += ' '
+            for c in text:
+                if c == '\n' or count == 16:
+                    count = 0
+                    row += 1
+                    if row == 2:
+                        break
+                    textCommand(0xc0)
+                    if c == '\n':
+                        continue
+                count += 1
+                bus.write_byte_data(DISPLAY_TEXT_ADDR, 0x40, ord(c))
+                time.sleep(0.001)  # Small pacing delay to prevent LCD buffer overflow
+        except OSError:
+            pass