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camtest: rework
This commit is contained in:
Thomas Farstrike
@@ -9,20 +9,51 @@ height = 240
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# Variable to hold the current memoryview to prevent garbage collection
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current_cam_buffer = None
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image_dsc = None
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image = None
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qr_label = None
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cont = lv.obj(appscreen)
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cont.set_style_pad_all(0, 0)
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cont.set_style_border_width(0, 0)
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cont.set_size(lv.pct(100), lv.pct(100))
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cont.set_scrollbar_mode(lv.SCROLLBAR_MODE.OFF)
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def print_qr_buffer(buffer):
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try:
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# Try to decode buffer as a UTF-8 string
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result = buffer.decode('utf-8')
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# Check if the string is printable (ASCII printable characters)
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if all(32 <= ord(c) <= 126 for c in result):
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return result
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except Exception as e:
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pass
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# If not a valid string or not printable, convert to hex
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hex_str = ' '.join([f'{b:02x}' for b in buffer])
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return hex_str.lower()
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# Byte-Order-Mark is added sometimes
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def remove_bom(buffer):
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bom = b'\xEF\xBB\xBF'
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if buffer.startswith(bom):
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return buffer[3:]
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return buffer
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def qrdecode_live():
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# Image dimensions
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buffer_size = width * height # 240 * 240 = 57600 bytes
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while keepgoing and keepliveqrdecoding:
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try:
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import qrdecode
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result = qrdecode.qrdecode(current_cam_buffer, width, height)
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result = remove_bom(result)
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result = print_qr_buffer(result)
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print(f"QR decoding found: {result}")
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except Exception as e:
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print("QR decode error: ", e)
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time.sleep_ms(500)
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def close_button_click(e):
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global keepgoing
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print("Close button clicked")
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keepgoing = False
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snap_button = lv.button(cont)
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snap_button.set_size(60, 60)
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snap_button.align(lv.ALIGN.RIGHT_MID, 0, 0)
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snap_label = lv.label(snap_button)
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snap_label.set_text(lv.SYMBOL.OK)
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snap_label.center()
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def snap_button_click(e):
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print("Picture taken!")
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@@ -41,43 +72,6 @@ def snap_button_click(e):
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except OSError as e:
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print(f"Error writing to file: {e}")
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snap_button.add_event_cb(snap_button_click,lv.EVENT.CLICKED,None)
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qr_button = lv.button(cont)
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qr_button.set_size(60, 60)
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qr_button.align(lv.ALIGN.BOTTOM_RIGHT, 0, 0)
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qr_label = lv.label(qr_button)
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qr_label.set_text(lv.SYMBOL.EYE_OPEN)
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qr_label.center()
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def process_qr_buffer(buffer):
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try:
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# Try to decode buffer as a UTF-8 string
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result = buffer.decode('utf-8')
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# Check if the string is printable (ASCII printable characters)
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if all(32 <= ord(c) <= 126 for c in result):
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return result
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except Exception as e:
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pass
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# If not a valid string or not printable, convert to hex
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hex_str = ' '.join([f'{b:02x}' for b in buffer])
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return hex_str.lower()
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def qrdecode_live():
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# Image dimensions
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buffer_size = width * height # 240 * 240 = 57600 bytes
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while keepgoing and keepliveqrdecoding:
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try:
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import qrdecode
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result = qrdecode.qrdecode(current_cam_buffer, width, height)
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if result.startswith('\ufeff'): # Remove BOM (\ufeff) from the start of the decoded string, if present
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result = result[1:]
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result = process_qr_buffer(result)
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print(f"QR decoding found: {result}")
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except Exception as e:
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print("QR decode error: ", e)
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time.sleep_ms(500)
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def qr_button_click(e):
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global keepliveqrdecoding, qr_label
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@@ -96,79 +90,9 @@ def qr_button_click(e):
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keepliveqrdecoding = False
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qr_label.set_text(lv.SYMBOL.EYE_OPEN)
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qr_button.add_event_cb(qr_button_click,lv.EVENT.CLICKED,None)
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close_button = lv.button(cont)
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close_button.set_size(60,60)
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close_button.align(lv.ALIGN.TOP_RIGHT, 0, 0)
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close_label = lv.label(close_button)
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close_label.set_text(lv.SYMBOL.CLOSE)
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close_label.center()
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def close_button_click(e):
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global keepgoing
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print("Close button clicked")
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keepgoing = False
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close_button.add_event_cb(close_button_click,lv.EVENT.CLICKED,None)
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from camera import Camera, GrabMode, PixelFormat, FrameSize, GainCeiling
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try:
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cam = Camera(
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data_pins=[12,13,15,11,14,10,7,2],
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vsync_pin=6,
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href_pin=4,
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sda_pin=21,
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scl_pin=16,
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pclk_pin=9,
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xclk_pin=8,
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xclk_freq=20000000,
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powerdown_pin=-1,
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reset_pin=-1,
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#pixel_format=PixelFormat.RGB565,
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pixel_format=PixelFormat.GRAYSCALE,
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frame_size=FrameSize.R240X240,
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grab_mode=GrabMode.LATEST
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)
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#cam.init() automatically done when creating the Camera()
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except Exception as e:
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print(f"Exception while initializing camera: {e}")
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#cam.reconfigure(frame_size=FrameSize.HVGA)
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#frame_size=FrameSize.HVGA, # 480x320
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#frame_size=FrameSize.QVGA, # 320x240
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#frame_size=FrameSize.QQVGA # 160x120
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cam.set_vflip(True)
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# Initialize LVGL image widget
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image = lv.image(cont)
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image.align(lv.ALIGN.LEFT_MID, 0, 0)
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image.set_rotation(900)
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# Create image descriptor once
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image_dsc = lv.image_dsc_t({
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"header": {
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"magic": lv.IMAGE_HEADER_MAGIC,
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"w": width,
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"h": height,
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"stride": width ,
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#"cf": lv.COLOR_FORMAT.RGB565
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"cf": lv.COLOR_FORMAT.L8
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},
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'data_size': width * height,
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'data': None # Will be updated per frame
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})
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# Set initial image source (optional, can be set in try_capture)
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image.set_src(image_dsc)
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def try_capture():
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global current_cam_buffer
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global current_cam_buffer, image_dsc, image
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if cam.frame_available():
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# Get new memoryview from camera
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new_cam_buffer = cam.capture() # Returns memoryview
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@@ -187,15 +111,89 @@ def try_capture():
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cam.free_buffer() # Free the old buffer
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current_cam_buffer = new_cam_buffer # Store new buffer reference
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# Initial capture
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try_capture()
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while appscreen == lv.screen_active() and keepgoing is True:
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try_capture()
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time.sleep_ms(100) # Allow for the MicroPython REPL to still work. Reducing it doesn't seem to affect the on-display FPS.
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def build_ui():
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global image, image_dsc,qr_label
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cont = lv.obj(appscreen)
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cont.set_style_pad_all(0, 0)
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cont.set_style_border_width(0, 0)
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cont.set_size(lv.pct(100), lv.pct(100))
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cont.set_scrollbar_mode(lv.SCROLLBAR_MODE.OFF)
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close_button = lv.button(cont)
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close_button.set_size(60,60)
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close_button.align(lv.ALIGN.TOP_RIGHT, 0, 0)
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close_label = lv.label(close_button)
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close_label.set_text(lv.SYMBOL.CLOSE)
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close_label.center()
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close_button.add_event_cb(close_button_click,lv.EVENT.CLICKED,None)
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snap_button = lv.button(cont)
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snap_button.set_size(60, 60)
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snap_button.align(lv.ALIGN.RIGHT_MID, 0, 0)
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snap_label = lv.label(snap_button)
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snap_label.set_text(lv.SYMBOL.OK)
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snap_label.center()
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snap_button.add_event_cb(snap_button_click,lv.EVENT.CLICKED,None)
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qr_button = lv.button(cont)
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qr_button.set_size(60, 60)
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qr_button.align(lv.ALIGN.BOTTOM_RIGHT, 0, 0)
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qr_label = lv.label(qr_button)
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qr_label.set_text(lv.SYMBOL.EYE_OPEN)
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qr_label.center()
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qr_button.add_event_cb(qr_button_click,lv.EVENT.CLICKED,None)
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# Initialize LVGL image widget
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image = lv.image(cont)
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image.align(lv.ALIGN.LEFT_MID, 0, 0)
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image.set_rotation(900)
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# Create image descriptor once
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image_dsc = lv.image_dsc_t({
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"header": {
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"magic": lv.IMAGE_HEADER_MAGIC,
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"w": width,
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"h": height,
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"stride": width ,
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#"cf": lv.COLOR_FORMAT.RGB565
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"cf": lv.COLOR_FORMAT.L8
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},
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'data_size': width * height,
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'data': None # Will be updated per frame
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})
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image.set_src(image_dsc)
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try:
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# time.sleep(1) doesn't help
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from camera import Camera, GrabMode, PixelFormat, FrameSize, GainCeiling
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cam = Camera(
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data_pins=[12,13,15,11,14,10,7,2],
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vsync_pin=6,
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href_pin=4,
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sda_pin=21,
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scl_pin=16,
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pclk_pin=9,
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xclk_pin=8,
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xclk_freq=20000000,
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powerdown_pin=-1,
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reset_pin=-1,
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#pixel_format=PixelFormat.RGB565,
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pixel_format=PixelFormat.GRAYSCALE,
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frame_size=FrameSize.R240X240,
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grab_mode=GrabMode.LATEST
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)
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#cam.init() automatically done when creating the Camera()
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#cam.reconfigure(frame_size=FrameSize.HVGA)
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#frame_size=FrameSize.HVGA, # 480x320
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#frame_size=FrameSize.QVGA, # 320x240
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#frame_size=FrameSize.QQVGA # 160x120
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cam.set_vflip(True)
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build_ui()
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while appscreen == lv.screen_active() and keepgoing is True:
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try_capture()
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time.sleep_ms(100) # Allow for the MicroPython REPL to still work. Reducing it doesn't seem to affect the on-display FPS.
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print("App backgrounded, deinitializing camera...")
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cam.deinit()
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show_launcher()
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except Exception as e:
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print(f"Exception: {e}")
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print("App backgrounded, deinitializing camera...")
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cam.deinit()
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show_launcher()
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