Exception: Failed to connect to ESP32: Timed out waiting for packet header



  • Trying to upgrade the firmware I get the error in the topic.

    The lopy is placed in the expansion board, led at the same end as usb.
    G23 and GND are connected.
    I have read/write access to the usb-serial device it presents itself as.

    Any ideas?



  • @chrisq, good to know you pulled a Macgyver and it worked :) . I'm proceeding to to close this thread now as it was solved.



  • @abilio Mystery solved!
    A paperclip worked as well, and I now found the original jumper lodged in a corner of the bubble bag.
    Thanks for all the help, I think I'm good to go now :)



  • Yes @chrisq, we've just found that was the cause for another user (see here). Can you place a jumper on TX and retry. If you don't have spare jumpers, you can take out the one that says BAT and use it to test.



  • @Xykon Thank you for the reply!

    Below is the result.
    I did just notice, however, that my expansion board did not come with a jumper on the "TX" pins, while in the picture docs.pycom.io it seems to be there. Could that be the issue?

    
    python2 bin/updater.py -f firmware/lopy_0.9.1.b1_868.bin -p /dev/ttyUSB0
    Namespace(file='firmware/lopy_0.9.1.b1_868.bin', port='/dev/ttyUSB0')
    Connecting...
    Exception: Failed to connect to ESP32: Timed out waiting for packet header, on line 75
    
    

  • administrators

    Can you check with a terminal program that you get this output when you reset the board while the G23/GND wire is connected?

    rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
    waiting for download
    

    Can you post the full output from the updater when you run it manually?

    bin/updater.py -f firmware/lopy_0.9.1.b1_868.bin -p /dev/ttyUSB0
    

    Make sure to use the correct file for your region (868/915).



  • @abilio The lopy shows up when scanning for wifi ap's (unless there's someone else in the office who also got one :) ).



  • @abilio Yes



  • In case it's useful:

    [ 8032.623635] usb 2-2: new full-speed USB device number 20 using xhci_hcd
    [ 8032.807496] ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
    [ 8032.807536] usb 2-2: Detected FT-X
    [ 8032.807724] usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0
    
     chrisq@berber   ~  lsusb
    Bus 002 Device 020: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO)
    
     chrisq@berber   ~  groups
    adm disk uucp log rfkill video audio floppy input power users docker chrisq
    
     chrisq@berber   ~  ls -la /dev/ttyUSB0
    crw-rw---- 1 root uucp 188, 0 Oct 31 15:29 /dev/ttyUSB0
    
    lsusb -vvv
    
      bcdUSB               2.00
      bDeviceClass            0
      bDeviceSubClass         0
      bDeviceProtocol         0
      bMaxPacketSize0         8
      idVendor           0x0403 Future Technology Devices International, Ltd
      idProduct          0x6015 Bridge(I2C/SPI/UART/FIFO)
      bcdDevice           10.00
      iManufacturer           1
      iProduct                2
      iSerial                 3
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           32
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0
        bmAttributes         0x80
          (Bus Powered)
        MaxPower               90mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           2
          bInterfaceClass       255 Vendor Specific Class
          bInterfaceSubClass    255 Vendor Specific Subclass
          bInterfaceProtocol    255 Vendor Specific Protocol
          iInterface              2
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0040  1x 64 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x02  EP 2 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0040  1x 64 bytes
            bInterval               0
    
    
    


  • @chrisq Do you have the jumpers in the expansion board?



  • @abilio Thank you for the quick reply.
    Yes, the led is blinking blue about every 4 seconds without the wire.



  • Hi @chrisq, can you confirm the LED blinking if you turn the board on without the wire?


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