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I am trying to connect ESP-Prog to Raspberry Pi Model 3B. The Pi is back-powered by 5V power supply connected to the hat on the Pi. By default, serial port /dev/ttyUSB1 is connected for Espressif device and I am able to program using serial bootloader. At times, there seems to be flow control error happening and either no serial port is recognized or suddenly it displays another serial port(other than the one which has been used from the beginning of the program).

On looking at the dmesg logs, I see the below error:

[  847.976410] ftdi_sio ttyUSB1: error from flowcontrol urb
[  847.976630] ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1
[  847.976678] ftdi_sio 1-1.5:1.1: device disconnected
[  848.933836] usb 1-1.5: new high-speed USB device number 35 using dwc_otg
[  849.064285] usb 1-1.5: device descriptor read/all, error -71
[  849.383831] usb 1-1.5: new high-speed USB device number 36 using dwc_otg
[  849.514646] usb 1-1.5: New USB device found, idVendor=0403, idProduct=6010, bcdD

Wondering if anyone else has encountered similar issue. If so, how did you fix/ work-around?

  • Verify that you are using the same serial settings on both ends of the serial port (parity, data bits, stop bits, and flow control). – HiredMind Jul 30 at 14:06
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First thing to try is separately powering the Pi, using a recommended supply to make sure it's getting enough. Then do some research on the vendor/device id and dwc_otg.

Dave

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