Issues with connecting OAK-1 with imx8Plus device using Depthai

mfocka

Hi everyone,

I have created some code that speaks with the OAK-1 and then uses some ML blob to detect objects. The code works perfectly on a Windows or Ubuntu machine, but it does not work on my embedded device.

When we call for the detection (in "detection.py", line 83: `in_nn = self.q_nn.tryGet()`), we get the following error (only on the board, not on a pc): `RuntimeError: Communication exception - possible device error/misconfiguration. Original message 'Couldn't read data from stream: 'input' (X_LINK_ERROR)`.

The device is the an imx8plus running Yocto Kirkstone with kernel 5.15.52.

Does anyone know of this issue and possibly how to resolve it?

The code (can be found on GitHub):

making the device (camera.py):

    def make_device(self):
        """Create a device based on the pipeline and device info."""

        self.pipeline = dai.Pipeline()
        cam_rgb = self.pipeline.create(dai.node.ColorCamera)
        detection_nn = self.pipeline.create(dai.node.YoloDetectionNetwork)

        # Set camera output
        self.__make_output()
        # Properties
        self.__make_properties(cam_rgb)
        # Set camera input
        controlIn = self.__make_input(cam_rgb)

        nnBlobPath = str((Path(__file__).parent / Path(
            'models/yolo_v4_tiny_tf/yolo-v4-tiny-tf_openvino_2021.4_6shave.blob')).resolve().absolute())
        if not Path(nnBlobPath).exists():
            import sys
            raise FileNotFoundError(
                f'Required file/s not found, please run "{sys.executable} install_requirements.py"')

        # Network specific settings
        self.__make_nn(detection_nn, nnBlobPath)
        # Link nodes
        cam_rgb.preview.link(detection_nn.input)
        cam_rgb.preview.link(self.cam_out.input)
        detection_nn.out.link(self.xout_nn.input)
        # Connect to device and start pipeline
        self.__start_pipeline()

 def __make_nn(self, nn, nnBlobPath):
        nn.setConfidenceThreshold(0.5)
        nn.setNumClasses(80)
        nn.setCoordinateSize(4)
        nn.setAnchors([10, 14, 23, 27, 37, 58, 81, 82, 135, 169, 344, 319])
        nn.setAnchorMasks({"side26": [1, 2, 3], "side13": [3, 4, 5]})
        nn.setIouThreshold(0.5)
        nn.setBlobPath(nnBlobPath)
        nn.setNumInferenceThreads(2)
        nn.input.setBlocking(False)

# Getting detection
def get_detections(self, gui: bool):
        try:
            self.q_nn = self.device.getOutputQueue(
                name="detections", maxSize=31, blocking=False)
        except Exception as e:
            print("Error creating 'detections' output queue:", e)
            raise e

        detections = []
        while True:
            try:
                in_nn = self.q_nn.tryGet() # ERROR

jakaskerl

Hi mfocka
Do standard examples work as you would expect? Does cam_test.py work? You might get more information by running dmesg | grep -i usb.

Thanks,
Jaka

mfocka

If I edit the python file such that it only contains functions that are in the headless opencv package, then it runs fine.

I have added the adjusted python file, the output of the dmesg and a screengrab of running the "cam_test.py"

python:

import os
#os.environ["DEPTHAI_LEVEL"] = "debug"

import cv2
import numpy as np
import argparse
import collections
import time
from itertools import cycle
from pathlib import Path
import sys
import signal


def socket_type_pair(arg):
    socket, type = arg.split(',')
    if not (socket in ['rgb', 'left', 'right', 'cama', 'camb', 'camc', 'camd']):
        raise ValueError("")
    if not (type in ['m', 'mono', 'c', 'color', 't', 'tof']):
        raise ValueError("")
    is_color = True if type in ['c', 'color'] else False
    is_tof = True if type in ['t', 'tof'] else False
    return [socket, is_color, is_tof]


parser = argparse.ArgumentParser()
parser.add_argument('-cams', '--cameras', type=socket_type_pair, nargs='+',
                    default=[['rgb', True, False], ['left', False, False],
                             ['right', False, False], ['camd', True, False]],
                    help="Which camera sockets to enable, and type: c[olor] / m[ono] / t[of]. "
                    "E.g: -cams rgb,m right,c . Default: rgb,c left,m right,m camd,c")
parser.add_argument('-mres', '--mono-resolution', type=int, default=800, choices={480, 400, 720, 800},
                    help="Select mono camera resolution (height). Default: %(default)s")
parser.add_argument('-cres', '--color-resolution', default='1080', choices={'720', '800', '1080', '1012', '1200', '1520', '4k', '5mp', '12mp', '13mp', '48mp'},
                    help="Select color camera resolution / height. Default: %(default)s")
parser.add_argument('-rot', '--rotate', const='all', choices={'all', 'rgb', 'mono'}, nargs="?",
                    help="Which cameras to rotate 180 degrees. All if not filtered")
parser.add_argument('-fps', '--fps', type=float, default=30,
                    help="FPS to set for all cameras")
parser.add_argument('-isp3afps', '--isp3afps', type=int, default=0,
                    help="3A FPS to set for all cameras")
parser.add_argument('-ds', '--isp-downscale', default=1, type=int,
                    help="Downscale the ISP output by this factor")
parser.add_argument('-rs', '--resizable-windows', action='store_true',
                    help="Make OpenCV windows resizable. Note: may introduce some artifacts")
parser.add_argument('-tun', '--camera-tuning', type=Path,
                    help="Path to custom camera tuning database")
parser.add_argument('-raw', '--enable-raw', default=False, action="store_true",
                    help='Enable the RAW camera streams')
parser.add_argument('-tofraw', '--tof-raw', action='store_true',
                    help="Show just ToF raw output instead of post-processed depth")
parser.add_argument('-tofamp', '--tof-amplitude', action='store_true',
                    help="Show also ToF amplitude output alongside depth")
parser.add_argument('-tofcm', '--tof-cm', action='store_true',
                    help="Show ToF depth output in centimeters, capped to 255")
parser.add_argument('-tofmedian', '--tof-median', choices=[0,3,5,7], default=5, type=int,
                    help="ToF median filter kernel size")
parser.add_argument('-rgbprev', '--rgb-preview', action='store_true',
                    help="Show RGB `preview` stream instead of full size `isp`")

parser.add_argument('-d', '--device', default="", type=str,
                    help="Optional MX ID of the device to connect to.")

parser.add_argument('-ctimeout', '--connection-timeout', default=30000,
                    help="Connection timeout in ms. Default: %(default)s (sets DEPTHAI_CONNECTION_TIMEOUT environment variable)")

parser.add_argument('-btimeout', '--boot-timeout', default=30000,
                    help="Boot timeout in ms. Default: %(default)s (sets DEPTHAI_BOOT_TIMEOUT environment variable)")

args = parser.parse_args()

# Set timeouts before importing depthai
os.environ["DEPTHAI_CONNECTION_TIMEOUT"] = str(args.connection_timeout)
os.environ["DEPTHAI_BOOT_TIMEOUT"] = str(args.boot_timeout)
import depthai as dai

cam_list = []
cam_type_color = {}
cam_type_tof = {}
print("Enabled cameras:")
for socket, is_color, is_tof in args.cameras:
    cam_list.append(socket)
    cam_type_color[socket] = is_color
    cam_type_tof[socket] = is_tof
    print(socket.rjust(7), ':', 'tof' if is_tof else 'color' if is_color else 'mono')

print("DepthAI version:", dai.__version__)
print("DepthAI path:", dai.__file__)

cam_socket_opts = {
    'rgb'  : dai.CameraBoardSocket.CAM_A,
    'left' : dai.CameraBoardSocket.CAM_B,
    'right': dai.CameraBoardSocket.CAM_C,
    'cama' : dai.CameraBoardSocket.CAM_A,
    'camb' : dai.CameraBoardSocket.CAM_B,
    'camc' : dai.CameraBoardSocket.CAM_C,
    'camd' : dai.CameraBoardSocket.CAM_D,
}

rotate = {
    'rgb': args.rotate in ['all', 'rgb'],
    'left': args.rotate in ['all', 'mono'],
    'right': args.rotate in ['all', 'mono'],
    'cama': args.rotate in ['all', 'rgb'],
    'camb': args.rotate in ['all', 'mono'],
    'camc': args.rotate in ['all', 'mono'],
    'camd': args.rotate in ['all', 'rgb'],
}

mono_res_opts = {
    400: dai.MonoCameraProperties.SensorResolution.THE_400_P,
    480: dai.MonoCameraProperties.SensorResolution.THE_480_P,
    720: dai.MonoCameraProperties.SensorResolution.THE_720_P,
    800: dai.MonoCameraProperties.SensorResolution.THE_800_P,
    1200: dai.MonoCameraProperties.SensorResolution.THE_1200_P,
}

color_res_opts = {
    '720':  dai.ColorCameraProperties.SensorResolution.THE_720_P,
    '800':  dai.ColorCameraProperties.SensorResolution.THE_800_P,
    '1080': dai.ColorCameraProperties.SensorResolution.THE_1080_P,
    '1012': dai.ColorCameraProperties.SensorResolution.THE_1352X1012,
    '1200': dai.ColorCameraProperties.SensorResolution.THE_1200_P,
    '1520': dai.ColorCameraProperties.SensorResolution.THE_2024X1520,
    '4k':   dai.ColorCameraProperties.SensorResolution.THE_4_K,
    '5mp': dai.ColorCameraProperties.SensorResolution.THE_5_MP,
    '12mp': dai.ColorCameraProperties.SensorResolution.THE_12_MP,
    '13mp': dai.ColorCameraProperties.SensorResolution.THE_13_MP,
    '48mp': dai.ColorCameraProperties.SensorResolution.THE_48_MP,
}

def clamp(num, v0, v1):
    return max(v0, min(num, v1))

# Calculates FPS over a moving window, configurable
class FPS:
    def __init__(self, window_size=30):
        self.dq = collections.deque(maxlen=window_size)
        self.fps = 0

    def update(self, timestamp=None):
        if timestamp == None:
            timestamp = time.monotonic()
        count = len(self.dq)
        if count > 0:
            self.fps = count / (timestamp - self.dq[0])
        self.dq.append(timestamp)

    def get(self):
        return self.fps

# Start defining a pipeline
pipeline = dai.Pipeline()
# Uncomment to get better throughput
# pipeline.setXLinkChunkSize(0)

control = pipeline.createXLinkIn()
control.setStreamName('control')

xinTofConfig = pipeline.createXLinkIn()
xinTofConfig.setStreamName('tofConfig')

cam = {}
tof = {}
xout = {}
xout_raw = {}
xout_tof_amp = {}
streams = []
tofConfig = {}
for c in cam_list:
    tofEnableRaw = False
    xout[c] = pipeline.createXLinkOut()
    xout[c].setStreamName(c)
    streams.append(c)
    if cam_type_tof[c]:
        cam[c] = pipeline.create(dai.node.ColorCamera)  # .Camera
        if args.tof_raw:
            tofEnableRaw = True
        else:
            tof[c] = pipeline.create(dai.node.ToF)
            cam[c].raw.link(tof[c].input)
            tof[c].depth.link(xout[c].input)
            xinTofConfig.out.link(tof[c].inputConfig)
            tofConfig = tof[c].initialConfig.get()
            tofConfig.depthParams.freqModUsed = dai.RawToFConfig.DepthParams.TypeFMod.MIN
            tofConfig.depthParams.avgPhaseShuffle = False
            tofConfig.depthParams.minimumAmplitude = 3.0

            if args.tof_median == 0:
                tofConfig.depthParams.median = dai.MedianFilter.MEDIAN_OFF
            elif args.tof_median == 3:
                tofConfig.depthParams.median = dai.MedianFilter.KERNEL_3x3
            elif args.tof_median == 5:
                tofConfig.depthParams.median = dai.MedianFilter.KERNEL_5x5
            elif args.tof_median == 7:
                tofConfig.depthParams.median = dai.MedianFilter.KERNEL_7x7

            tof[c].initialConfig.set(tofConfig)
            if args.tof_amplitude:
                amp_name = 'tof_amplitude_' + c
                xout_tof_amp[c] = pipeline.create(dai.node.XLinkOut)
                xout_tof_amp[c].setStreamName(amp_name)
                streams.append(amp_name)
                tof[c].amplitude.link(xout_tof_amp[c].input)
    elif cam_type_color[c]:
        cam[c] = pipeline.createColorCamera()
        cam[c].setResolution(color_res_opts[args.color_resolution])
        cam[c].setIspScale(1, args.isp_downscale)
        # cam[c].initialControl.setManualFocus(85) # TODO
        if args.rgb_preview:
            cam[c].preview.link(xout[c].input)
        else:
            cam[c].isp.link(xout[c].input)
    else:
        cam[c] = pipeline.createMonoCamera()
        cam[c].setResolution(mono_res_opts[args.mono_resolution])
        cam[c].out.link(xout[c].input)
    cam[c].setBoardSocket(cam_socket_opts[c])
    # Num frames to capture on trigger, with first to be discarded (due to degraded quality)
    # cam[c].initialControl.setExternalTrigger(2, 1)
    # cam[c].initialControl.setStrobeExternal(48, 1)
    # cam[c].initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)

    # cam[c].initialControl.setManualExposure(15000, 400) # exposure [us], iso
    # When set, takes effect after the first 2 frames
    # cam[c].initialControl.setManualWhiteBalance(4000)  # light temperature in K, 1000..12000
    control.out.link(cam[c].inputControl)
    if rotate[c]:
        cam[c].setImageOrientation(dai.CameraImageOrientation.ROTATE_180_DEG)
    cam[c].setFps(args.fps)
    if args.isp3afps:
        cam[c].setIsp3aFps(args.isp3afps)

    if args.enable_raw or tofEnableRaw:
        raw_name = 'raw_' + c
        xout_raw[c] = pipeline.create(dai.node.XLinkOut)
        xout_raw[c].setStreamName(raw_name)
        streams.append(raw_name)
        cam[c].raw.link(xout_raw[c].input)
        cam[c].setRawOutputPacked(False)

if args.camera_tuning:
    pipeline.setCameraTuningBlobPath(str(args.camera_tuning))

def exit_cleanly(signum, frame):
    print("Exiting cleanly")
    cv2.destroyAllWindows()
    sys.exit(0)

signal.signal(signal.SIGINT, exit_cleanly)


# Pipeline is defined, now we can connect to the device
device = dai.Device.getDeviceByMxId(args.device)
dai_device_args = [pipeline]
if device[0]:
    dai_device_args.append(device[1])
with dai.Device(*dai_device_args) as device:
    # print('Connected cameras:', [c.name for c in device.getConnectedCameras()])
    print('Connected cameras:')
    cam_name = {}
    for p in device.getConnectedCameraFeatures():
        print(
            f' -socket {p.socket.name:6}: {p.sensorName:6} {p.width:4} x {p.height:4} focus:', end='')
        print('auto ' if p.hasAutofocus else 'fixed', '- ', end='')
        print(*[type.name for type in p.supportedTypes])
        cam_name[p.socket.name] = p.sensorName
        if args.enable_raw:
            cam_name['raw_'+p.socket.name] = p.sensorName
        if args.tof_amplitude:
            cam_name['tof_amplitude_'+p.socket.name] = p.sensorName

    print('USB speed:', device.getUsbSpeed().name)

    print('IR drivers:', device.getIrDrivers())

    q = {}
    fps_host = {}  # FPS computed based on the time we receive frames in app
    fps_capt = {}  # FPS computed based on capture timestamps from device
    for c in streams:
        q[c] = device.getOutputQueue(name=c, maxSize=4, blocking=False)
        # The OpenCV window resize may produce some artifacts
        if args.resizable_windows:
            cv2.namedWindow(c, cv2.WINDOW_NORMAL)
            cv2.resizeWindow(c, (640, 480))
        fps_host[c] = FPS()
        fps_capt[c] = FPS()

    controlQueue = device.getInputQueue('control')
    tofCfgQueue = device.getInputQueue('tofConfig')

    # Manual exposure/focus set step
    EXP_STEP = 500  # us
    ISO_STEP = 50
    LENS_STEP = 3
    DOT_STEP = 100
    FLOOD_STEP = 100
    DOT_MAX = 1200
    FLOOD_MAX = 1500

    # Defaults and limits for manual focus/exposure controls
    lensPos = 150
    lensMin = 0
    lensMax = 255

    expTime = 20000
    expMin = 1
    expMax = 33000

    sensIso = 800
    sensMin = 100
    sensMax = 1600

    dotIntensity = 0
    floodIntensity = 0

    awb_mode = cycle([item for name, item in vars(
        dai.CameraControl.AutoWhiteBalanceMode).items() if name.isupper()])
    anti_banding_mode = cycle([item for name, item in vars(
        dai.CameraControl.AntiBandingMode).items() if name.isupper()])
    effect_mode = cycle([item for name, item in vars(
        dai.CameraControl.EffectMode).items() if name.isupper()])

    ae_comp = 0
    ae_lock = False
    awb_lock = False
    saturation = 0
    contrast = 0
    brightness = 0
    sharpness = 0
    luma_denoise = 0
    chroma_denoise = 0
    control = 'none'
    show = False

    jet_custom = cv2.applyColorMap(np.arange(256, dtype=np.uint8), cv2.COLORMAP_JET)
    jet_custom[0] = [0, 0, 0]

    print("Cam:", *['     ' + c.ljust(8)
          for c in cam_list], "[host | capture timestamp]")

    capture_list = []
    while True:
        for c in streams:
            try:
                pkt = q[c].tryGet()
            except Exception as e:
                print(e)
                exit_cleanly(0, 0)
            if pkt is not None:
                fps_host[c].update()
                fps_capt[c].update(pkt.getTimestamp().total_seconds())
                width, height = pkt.getWidth(), pkt.getHeight()
                frame = pkt.getCvFrame()
                cam_skt = c.split('_')[-1]
                if cam_type_tof[cam_skt] and not (c.startswith('raw_') or c.startswith('tof_amplitude_')):
                    if args.tof_cm:
                        # pixels represent `cm`, capped to 255. Value can be checked hovering the mouse
                        frame = (frame // 10).clip(0, 255).astype(np.uint8)
                    else:
                        frame = (frame.view(np.int16).astype(float))
                        frame = cv2.normalize(frame, frame, alpha=255, beta=0, norm_type=cv2.NORM_MINMAX, dtype=cv2.CV_8U)
                        frame = cv2.applyColorMap(frame, jet_custom)
                if show:
                    txt = f"[{c:5}, {pkt.getSequenceNum():4}] "
                    txt += f"Exp: {pkt.getExposureTime().total_seconds()*1000:6.3f} ms, "
                    txt += f"ISO: {pkt.getSensitivity():4}, "
                    txt += f"Lens pos: {pkt.getLensPosition():3}, "
                    txt += f"Color temp: {pkt.getColorTemperature()} K"
                    if needs_newline:
                        print()
                        needs_newline = False
                    print(txt)
                capture = c in capture_list
                if capture:
                    capture_file_info = ('capture_' + c + '_' + cam_name[cam_socket_opts[cam_skt].name]
                         + '_' + str(width) + 'x' + str(height)
                         + '_exp_' + str(int(pkt.getExposureTime().total_seconds()*1e6))
                         + '_iso_' + str(pkt.getSensitivity())
                         + '_lens_' + str(pkt.getLensPosition())
                         + '_' + capture_time
                         + '_' + str(pkt.getSequenceNum())
                        )
                    capture_list.remove(c)
                    print()
                if c.startswith('raw_') or c.startswith('tof_amplitude_'):
                    if capture:
                        filename = capture_file_info + '_10bit.bw'
                        print('Saving:', filename)
                        frame.tofile(filename)
                    # Full range for display, use bits [15:6] of the 16-bit pixels
                    type = pkt.getType()
                    multiplier = 1
                    if type == dai.ImgFrame.Type.RAW10: multiplier = (1 << (16-10))
                    if type == dai.ImgFrame.Type.RAW12: multiplier = (1 << (16-4))
                    frame = frame * multiplier
                    # Debayer as color for preview/png
                    if cam_type_color[cam_skt]:
                        # See this for the ordering, at the end of page:
                        # https://docs.opencv.org/4.5.1/de/d25/imgproc_color_conversions.html
                        # TODO add bayer order to ImgFrame getType()
                        frame = cv2.cvtColor(frame, cv2.COLOR_BayerGB2BGR)
                else:
                    # Save YUV too, but only when RAW is also enabled (for tuning purposes)
                    if capture and args.enable_raw:
                        payload = pkt.getData()
                        filename = capture_file_info + '_P420.yuv'
                        print('Saving:', filename)
                        payload.tofile(filename)
                if capture:
                    filename = capture_file_info + '.png'
                    print('Saving:', filename)
        print("\rFPS:",
              *["{:6.2f}|{:6.2f}".format(fps_host[c].get(), fps_capt[c].get()) for c in cam_list],
              end=' ', flush=True)
        needs_newline = True


    print()

dmesg:

[    0.106724] usbcore: registered new interface driver usbfs
[    0.106760] usbcore: registered new interface driver hub
[    0.106785] usbcore: registered new device driver usb
[    0.218926] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.219168] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.219941] usbcore: registered new interface driver uas
[    0.219985] usbcore: registered new interface driver usb-storage
[    0.220051] usbcore: registered new interface driver usbserial_generic
[    0.220074] usbserial: USB Serial support registered for generic
[    0.220101] usbcore: registered new interface driver ftdi_sio
[    0.220123] usbserial: USB Serial support registered for FTDI USB Serial Device
[    0.220155] usbcore: registered new interface driver usb_serial_simple
[    0.220174] usbserial: USB Serial support registered for carelink
[    0.220192] usbserial: USB Serial support registered for zio
[    0.220213] usbserial: USB Serial support registered for funsoft
[    0.220234] usbserial: USB Serial support registered for flashloader
[    0.220252] usbserial: USB Serial support registered for google
[    0.220273] usbserial: USB Serial support registered for libtransistor
[    0.220291] usbserial: USB Serial support registered for vivopay
[    0.220310] usbserial: USB Serial support registered for moto_modem
[    0.220329] usbserial: USB Serial support registered for motorola_tetra
[    0.220352] usbserial: USB Serial support registered for nokia
[    0.220376] usbserial: USB Serial support registered for novatel_gps
[    0.220394] usbserial: USB Serial support registered for hp4x
[    0.220414] usbserial: USB Serial support registered for suunto
[    0.220432] usbserial: USB Serial support registered for siemens_mpi
[    0.220464] usbcore: registered new interface driver usb_ehset_test
[    0.232796] usbcore: registered new interface driver usbhid
[    0.232804] usbhid: USB HID core driver
[    2.330630] xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 1
[    2.354657] hub 1-0:1.0: USB hub found
[    2.368113] xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 2
[    2.375785] xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed
[    2.382369] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[    2.390862] hub 2-0:1.0: USB hub found
[    2.626376] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[    2.831652] hub 1-1:1.0: USB hub found
[    2.915041] usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
[    2.975321] hub 2-1:1.0: USB hub found
[  815.625929] usb 1-1.2: new high-speed USB device number 3 using xhci-hcd
[  855.418717] usb 1-1.2: USB disconnect, device number 3
[  856.164748] usb 2-1.2: new SuperSpeed USB device number 3 using xhci-hcd
[  856.660836] usb 2-1.2: USB disconnect, device number 3
[  856.908715] usb 1-1.2: new high-speed USB device number 4 using xhci-hcd
[ 3411.634561] usb 1-1.2: USB disconnect, device number 4
[ 3412.437928] usb 2-1.2: new SuperSpeed USB device number 4 using xhci-hcd
[ 3412.936592] usb 2-1.2: USB disconnect, device number 4
[ 3413.189887] usb 1-1.2: new high-speed USB device number 5 using xhci-hcd
[ 3458.339968] usb 1-1.2: USB disconnect, device number 5
[ 3458.987736] usb 2-1.2: new SuperSpeed USB device number 5 using xhci-hcd
[ 3459.484450] usb 2-1.2: USB disconnect, device number 5
[ 3459.731690] usb 1-1.2: new high-speed USB device number 6 using xhci-hcd
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jakaskerl

Hi mfocka
So the cam_test.py works as expected; no crashes? And I would assume all rgbcamera examples work as well?
Could you maybe try stock examples for the NN node? Something like rgb yolo (https://docs.luxonis.com/projects/api/en/latest/samples/Yolo/tiny_yolo/), just so we can make sure there isn't anything wrong with the code or the NN model.

Thanks,
Jaka

mfocka

Hi, for some reason, when I reply, I cannot send the message, so I have to do it like this.

The cam_test.py works as expected. To get an even better idea, I have created simplified code of my previous sample. As soon as I start the pipeline for the neural network, I get the X_LINK_ERROR. Even if I do not use any of the neural network's pipelines features. When I comment out the making of this pipeline, I no longer have any issues and can get video and still frames without issues. However, the complete code -- including the neural network pipeline --, works fine on my Windows and Ubuntu machine while using the same packages (respective of their OS). It only does not work on the embedded device.

I have ran the tiny_yolo sample (changing it to fit headless-opencv and using my own version of the tiny yolo) and here I have the same issue, the A.I. pipeline makes it no longer work. The full error code:
Traceback (most recent call last):

File "demo_ai.py", line 99, in <module>
    `inDet = qDet.tryGet()`
RuntimeError: Communication exception - possible device error/misconfiguration. Original message 'Couldn't read data from stream: 'nn' (X_LINK_ERROR)'

jakaskerl

mfocka
Could you use the default yolo model as well? Very strange that it works on other machines.

mfocka changing it to fit headless-opencv

What are you using headless-opencv for? Since it's one of the few differences between the board you are using and the other machines on which the examples work, it could be the culprit.

What are you using to power your device (the oak)? Have you thought about device not getting enough power when enabling the NN?

Thanks,
Jaka

mfocka

jakaskerl
Hi, I completely forgot this thread.

The issue was indeed (mostly) with the power. If I reduced the fps it started working again.
Thank you for all the help and replies, and again, my apologies for the late reply!

P.S. The reason why I am using headless is because it needs to be light-weight and there will never be a screen attached to the board, so this version is easier to run.