You've already forked MicroPythonOS
mirror of
https://github.com/m5stack/MicroPythonOS.git
synced 2026-05-20 11:51:27 -07:00
Thomas Farstrike
311 lines
12 KiB
Python
311 lines
12 KiB
Python
# This code grabs images from the camera in RGB565 format (2 bytes per pixel)
|
|
# and sends that to the QR decoder if QR decoding is enabled.
|
|
# The QR decoder then converts the RGB565 to grayscale, as that's what quirc operates on.
|
|
# It would be slightly more efficient to capture the images from the camera in L8/grayscale format,
|
|
# or in YUV format and discarding the U and V planes, but then the image will be gray (not great UX)
|
|
# and the performance impact of converting RGB565 to grayscale is probably minimal anyway.
|
|
|
|
import lvgl as lv
|
|
|
|
try:
|
|
import webcam
|
|
except Exception as e:
|
|
print(f"Info: could not import webcam module: {e}")
|
|
|
|
from mpos.apps import Activity
|
|
import mpos.time
|
|
|
|
class CameraApp(Activity):
|
|
|
|
width = 240
|
|
height = 240
|
|
|
|
status_label_text = "No camera found."
|
|
status_label_text_searching = "Searching QR codes...\n\nHold still and try varying scan distance (10-20cm) and QR size (6-12cm). Ensure proper lighting."
|
|
status_label_text_found = "Decoding QR..."
|
|
|
|
cam = None
|
|
current_cam_buffer = None # Holds the current memoryview to prevent garbage collection
|
|
|
|
image = None
|
|
image_dsc = None
|
|
scanqr_mode = None
|
|
use_webcam = False
|
|
keepliveqrdecoding = False
|
|
|
|
capture_timer = None
|
|
|
|
# Widgets:
|
|
qr_label = None
|
|
qr_button = None
|
|
snap_button = None
|
|
status_label = None
|
|
status_label_cont = None
|
|
|
|
def onCreate(self):
|
|
self.scanqr_mode = self.getIntent().extras.get("scanqr_mode")
|
|
main_screen = lv.obj()
|
|
main_screen.set_style_pad_all(0, 0)
|
|
main_screen.set_style_border_width(0, 0)
|
|
main_screen.set_size(lv.pct(100), lv.pct(100))
|
|
main_screen.set_scrollbar_mode(lv.SCROLLBAR_MODE.OFF)
|
|
close_button = lv.button(main_screen)
|
|
close_button.set_size(60,60)
|
|
close_button.align(lv.ALIGN.TOP_RIGHT, 0, 0)
|
|
close_label = lv.label(close_button)
|
|
close_label.set_text(lv.SYMBOL.CLOSE)
|
|
close_label.center()
|
|
close_button.add_event_cb(lambda e: self.finish(),lv.EVENT.CLICKED,None)
|
|
self.snap_button = lv.button(main_screen)
|
|
self.snap_button.set_size(60, 60)
|
|
self.snap_button.align(lv.ALIGN.RIGHT_MID, 0, 0)
|
|
self.snap_button.add_flag(lv.obj.FLAG.HIDDEN)
|
|
self.snap_button.add_event_cb(self.snap_button_click,lv.EVENT.CLICKED,None)
|
|
snap_label = lv.label(self.snap_button)
|
|
snap_label.set_text(lv.SYMBOL.OK)
|
|
snap_label.center()
|
|
self.qr_button = lv.button(main_screen)
|
|
self.qr_button.set_size(60, 60)
|
|
self.qr_button.add_flag(lv.obj.FLAG.HIDDEN)
|
|
self.qr_button.align(lv.ALIGN.BOTTOM_RIGHT, 0, 0)
|
|
self.qr_button.add_event_cb(self.qr_button_click,lv.EVENT.CLICKED,None)
|
|
self.qr_label = lv.label(self.qr_button)
|
|
self.qr_label.set_text(lv.SYMBOL.EYE_OPEN)
|
|
self.qr_label.center()
|
|
# Initialize LVGL image widget
|
|
self.image = lv.image(main_screen)
|
|
self.image.align(lv.ALIGN.LEFT_MID, 0, 0)
|
|
# Create image descriptor once
|
|
self.image_dsc = lv.image_dsc_t({
|
|
"header": {
|
|
"magic": lv.IMAGE_HEADER_MAGIC,
|
|
"w": self.width,
|
|
"h": self.height,
|
|
"stride": self.width * 2,
|
|
"cf": lv.COLOR_FORMAT.RGB565
|
|
#"cf": lv.COLOR_FORMAT.L8
|
|
},
|
|
'data_size': self.width * self.height * 2,
|
|
'data': None # Will be updated per frame
|
|
})
|
|
self.image.set_src(self.image_dsc)
|
|
self.status_label_cont = lv.obj(main_screen)
|
|
self.status_label_cont.set_size(lv.pct(66),lv.pct(60))
|
|
self.status_label_cont.align(lv.ALIGN.LEFT_MID, lv.pct(5), 0)
|
|
self.status_label_cont.set_style_bg_color(lv.color_white(), 0)
|
|
self.status_label_cont.set_style_bg_opa(66, 0)
|
|
self.status_label_cont.set_style_border_width(0, 0)
|
|
self.status_label = lv.label(self.status_label_cont)
|
|
self.status_label.set_text("No camera found.")
|
|
self.status_label.set_long_mode(lv.label.LONG_MODE.WRAP)
|
|
self.status_label.set_width(lv.pct(100))
|
|
self.status_label.center()
|
|
self.setContentView(main_screen)
|
|
|
|
def onResume(self, screen):
|
|
self.cam = init_internal_cam()
|
|
if self.cam:
|
|
self.image.set_rotation(900) # internal camera is rotated 90 degrees
|
|
else:
|
|
print("camera app: no internal camera found, trying webcam on /dev/video0")
|
|
try:
|
|
self.cam = webcam.init("/dev/video0")
|
|
self.use_webcam = True
|
|
except Exception as e:
|
|
print(f"camera app: webcam exception: {e}")
|
|
if self.cam:
|
|
print("Camera app initialized, continuing...")
|
|
self.set_image_size()
|
|
self.capture_timer = lv.timer_create(self.try_capture, 100, None)
|
|
self.status_label_cont.add_flag(lv.obj.FLAG.HIDDEN)
|
|
if self.scanqr_mode:
|
|
self.start_qr_decoding()
|
|
else:
|
|
self.qr_button.remove_flag(lv.obj.FLAG.HIDDEN)
|
|
self.snap_button.remove_flag(lv.obj.FLAG.HIDDEN)
|
|
else:
|
|
print("No camera found, stopping camera app")
|
|
if self.scanqr_mode:
|
|
self.finish()
|
|
|
|
|
|
def onStop(self, screen):
|
|
print("camera app backgrounded, cleaning up...")
|
|
if self.capture_timer:
|
|
self.capture_timer.delete()
|
|
if self.use_webcam:
|
|
webcam.deinit(self.cam)
|
|
elif self.cam:
|
|
self.cam.deinit()
|
|
# Power off, otherwise it keeps using a lot of current
|
|
try:
|
|
from machine import Pin, I2C
|
|
i2c = I2C(1, scl=Pin(16), sda=Pin(21)) # Adjust pins and frequency
|
|
#devices = i2c.scan()
|
|
#print([hex(addr) for addr in devices]) # finds it on 60 = 0x3C after init
|
|
camera_addr = 0x3C # for OV5640
|
|
reg_addr = 0x3008
|
|
reg_high = (reg_addr >> 8) & 0xFF # 0x30
|
|
reg_low = reg_addr & 0xFF # 0x08
|
|
power_off_command = 0x42 # Power off command
|
|
i2c.writeto(camera_addr, bytes([reg_high, reg_low, power_off_command]))
|
|
except Exception as e:
|
|
print(f"Warning: powering off camera got exception: {e}")
|
|
print("camera app cleanup done.")
|
|
|
|
def set_image_size(self):
|
|
disp = lv.display_get_default()
|
|
target_h = disp.get_vertical_resolution()
|
|
target_w = target_h
|
|
if target_w == self.width and target_h == self.height:
|
|
print("Target width and height are the same as native image, no scaling required.")
|
|
return
|
|
print(f"scaling to size: {target_w}x{target_h}")
|
|
scale_factor_w = round(target_w * 256 / self.width)
|
|
scale_factor_h = round(target_h * 256 / self.height)
|
|
print(f"scale_factors: {scale_factor_w},{scale_factor_h}")
|
|
self.image.set_size(target_w, target_h)
|
|
#self.image.set_scale(max(scale_factor_w,scale_factor_h)) # fills the entire screen but cuts off borders
|
|
self.image.set_scale(min(scale_factor_w,scale_factor_h))
|
|
|
|
def qrdecode_one(self):
|
|
try:
|
|
import qrdecode
|
|
import utime
|
|
before = utime.ticks_ms()
|
|
result = qrdecode.qrdecode_rgb565(self.current_cam_buffer, self.width, self.height)
|
|
after = utime.ticks_ms()
|
|
#result = bytearray("INSERT_QR_HERE", "utf-8")
|
|
if not result:
|
|
self.status_label.set_text(self.status_label_text_searching)
|
|
else:
|
|
print(f"SUCCESSFUL QR DECODE TOOK: {after-before}ms")
|
|
result = remove_bom(result)
|
|
result = print_qr_buffer(result)
|
|
print(f"QR decoding found: {result}")
|
|
if self.scanqr_mode:
|
|
self.setResult(True, result)
|
|
self.finish()
|
|
else:
|
|
self.status_label.set_text(result) # in the future, the status_label text should be copy-paste-able
|
|
self.stop_qr_decoding()
|
|
except ValueError as e:
|
|
print("QR ValueError: ", e)
|
|
self.status_label.set_text(self.status_label_text_searching)
|
|
except TypeError as e:
|
|
print("QR TypeError: ", e)
|
|
self.status_label.set_text(self.status_label_text_found)
|
|
except Exception as e:
|
|
print("QR got other error: ", e)
|
|
|
|
def snap_button_click(self, e):
|
|
print("Picture taken!")
|
|
import os
|
|
try:
|
|
os.mkdir("data")
|
|
except OSError:
|
|
pass
|
|
try:
|
|
os.mkdir("data/images")
|
|
except OSError:
|
|
pass
|
|
if self.current_cam_buffer is not None:
|
|
filename=f"data/images/camera_capture_{mpos.time.epoch_seconds()}_{self.width}x{self.height}_RGB565.raw"
|
|
try:
|
|
with open(filename, 'wb') as f:
|
|
f.write(self.current_cam_buffer)
|
|
print(f"Successfully wrote current_cam_buffer to {filename}")
|
|
except OSError as e:
|
|
print(f"Error writing to file: {e}")
|
|
|
|
def start_qr_decoding(self):
|
|
print("Activating live QR decoding...")
|
|
self.keepliveqrdecoding = True
|
|
self.qr_label.set_text(lv.SYMBOL.EYE_CLOSE)
|
|
self.status_label_cont.remove_flag(lv.obj.FLAG.HIDDEN)
|
|
self.status_label.set_text(self.status_label_text_searching)
|
|
|
|
def stop_qr_decoding(self):
|
|
print("Deactivating live QR decoding...")
|
|
self.keepliveqrdecoding = False
|
|
self.qr_label.set_text(lv.SYMBOL.EYE_OPEN)
|
|
self.status_label_text = self.status_label.get_text()
|
|
if self.status_label_text in (self.status_label_text_searching or self.status_label_text_found): # if it found a QR code, leave it
|
|
self.status_label_cont.add_flag(lv.obj.FLAG.HIDDEN)
|
|
|
|
def qr_button_click(self, e):
|
|
if not self.keepliveqrdecoding:
|
|
self.start_qr_decoding()
|
|
else:
|
|
self.stop_qr_decoding()
|
|
|
|
def try_capture(self, event):
|
|
#print("capturing camera frame")
|
|
try:
|
|
if self.use_webcam:
|
|
self.current_cam_buffer = webcam.capture_frame(self.cam, "rgb565")
|
|
elif self.cam.frame_available():
|
|
self.current_cam_buffer = self.cam.capture()
|
|
if self.current_cam_buffer and len(self.current_cam_buffer):
|
|
self.image_dsc.data = self.current_cam_buffer
|
|
#image.invalidate() # does not work so do this:
|
|
self.image.set_src(self.image_dsc)
|
|
if not self.use_webcam:
|
|
self.cam.free_buffer() # Free the old buffer
|
|
if self.keepliveqrdecoding:
|
|
self.qrdecode_one()
|
|
except Exception as e:
|
|
print(f"Camera capture exception: {e}")
|
|
|
|
|
|
# Non-class functions:
|
|
def init_internal_cam():
|
|
try:
|
|
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,
|
|
frame_size=FrameSize.R240X240,
|
|
grab_mode=GrabMode.LATEST
|
|
)
|
|
#cam.init() automatically done when creating the Camera()
|
|
#cam.reconfigure(frame_size=FrameSize.HVGA)
|
|
#frame_size=FrameSize.HVGA, # 480x320
|
|
#frame_size=FrameSize.QVGA, # 320x240
|
|
#frame_size=FrameSize.QQVGA # 160x120
|
|
cam.set_vflip(True)
|
|
return cam
|
|
except Exception as e:
|
|
print(f"init_cam exception: {e}")
|
|
return None
|
|
|
|
def print_qr_buffer(buffer):
|
|
try:
|
|
# Try to decode buffer as a UTF-8 string
|
|
result = buffer.decode('utf-8')
|
|
# Check if the string is printable (ASCII printable characters)
|
|
if all(32 <= ord(c) <= 126 for c in result):
|
|
return result
|
|
except Exception as e:
|
|
pass
|
|
# If not a valid string or not printable, convert to hex
|
|
hex_str = ' '.join([f'{b:02x}' for b in buffer])
|
|
return hex_str.lower()
|
|
|
|
# Byte-Order-Mark is added sometimes
|
|
def remove_bom(buffer):
|
|
bom = b'\xEF\xBB\xBF'
|
|
if buffer.startswith(bom):
|
|
return buffer[3:]
|
|
return buffer
|