camtestcolor: crashes when displaying in color

ThomasFarstrike · ThomasFarstrike · commit cb2376e53820 · 2025-05-14T15:55:14.000+02:00
diff --git a/internal_filesystem/apps/com.example.camtestnew/assets/camtestcolor.py b/internal_filesystem/apps/com.example.camtestnew/assets/camtestcolor.py
@@ -0,0 +1,73 @@
+# This works with copy-paste
+# It also works like this:
+# import mpos
+# mpos.apps.execute_script("apps/com.example.camtestnew/assets/camtestnew.py", True, False, True)
+# import mpos
+# mpos.apps.execute_script_new_thread("apps/com.example.camtestnew/assets/camtestnew.py", True, False, True)
+
+
+width=240
+height=240
+
+import time
+
+th.disable()
+
+
+from camera import Camera, GrabMode, PixelFormat, FrameSize, GainCeiling
+cam = Camera(
+    data_pins=[12,13,15,11,14,10,7,2],
+    vsync_pin=6,
+    href_pin=4,
+    sda_pin=21,
+    scl_pin=16,
+    pclk_pin=9,
+    xclk_pin=8,
+    xclk_freq=20000000,
+    powerdown_pin=-1,
+    reset_pin=-1,
+    #pixel_format=PixelFormat.RGB565,
+    #pixel_format=PixelFormat.GRAYSCALE,
+    #pixel_format=PixelFormat.YUV420,
+    pixel_format=PixelFormat.YUV422, # works
+    frame_size=FrameSize.R240X240,
+    grab_mode=GrabMode.LATEST 
+)
+
+
+
+image = lv.image(lv.screen_active())
+image.align(lv.ALIGN.LEFT_MID, 0, 0)
+image.set_rotation(900)
+
+# Create image descriptor once
+image_dsc = lv.image_dsc_t({
+    "header": {
+        "magic": lv.IMAGE_HEADER_MAGIC,
+        "w": width,
+        "h": height,
+        "stride": width,
+        "cf": lv.COLOR_FORMAT.I422
+    },
+    'data_size': width * height,
+    'data': None # Will be updated per frame
+})
+image.set_src(image_dsc)
+
+
+
+for i in range(100):
+    print(f"iteration {i}")
+    image_dsc.data = cam.capture()  # Returns memoryview
+    image.set_src(image_dsc)
+    #image.invalidate()
+    lv.task_handler()
+    time.sleep_ms(5) # seems to need more than 0 or 1 ms, otherwise there's almost never a new image...
+    lv.tick_inc(5)
+
+
+print("cleanup")
+cam.deinit()
+
+
+th.enable()
