FTDI USB Serial Device disconnects

Installing and Using OpenWrt
1

I've connected a FTDI USB Serial Device to my OpenWRT router in order to have a EnOcean system available via ser2net. It works for 1 or 2 transmitted messages and after that the USB device is disconnect and reconnects directly after that.

dmesg output:

[   93.766246] usb 1-1: new full-speed USB device number 3 using ehci-platform
[   93.983528] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[   93.990487] usb 1-1: Detected FT232R
[   94.008800] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[  121.372505] usb 1-1: USB disconnect, device number 3
[  121.377852] ftdi_sio ttyUSB0: error from flowcontrol urb
[  121.383738] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[  121.392482] ftdi_sio 1-1:1.0: device disconnected
[  121.774425] usb 1-1: new full-speed USB device number 4 using ehci-platform
[  121.993489] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[  122.000452] usb 1-1: Detected FT232R
[  122.016947] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[  682.270238] usb 1-1: USB disconnect, device number 4
[  682.275553] ftdi_sio ttyUSB0: error from flowcontrol urb
[  682.281644] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[  682.290430] ftdi_sio 1-1:1.0: device disconnected
[  682.667408] usb 1-1: new full-speed USB device number 5 using ehci-platform
[  682.886467] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[  682.893417] usb 1-1: Detected FT232R
[  682.920796] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[  729.912960] usb 1-1: USB disconnect, device number 5
[  729.921380] ftdi_sio ttyUSB0: error from flowcontrol urb
[  729.927286] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[  729.936001] ftdi_sio 1-1:1.0: device disconnected
[  730.316898] usb 1-1: new full-speed USB device number 6 using ehci-platform
[  730.534504] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[  730.541463] usb 1-1: Detected FT232R
[  730.558785] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0

kmod-usb-serial-ftdi and kmod-usb-serial are installed. OpenWRT 24.10.1 on a Archer TP-Link C7 v2.

Any ideas?

2

it will not help you, but looks like it is a known problem for years

3

Well the same connection works on a debian workstation, but fails on OpenWRT.

4

tried putting a powered hub between the router and the FT232Rs ?

1 Like
5

No, I don't own one. You think the power is too low?

Tried it with a Linksys EA7300 v2 with the same result and error message.

6

it could be an issue ... PCs are obviously beefier, power wise.

7

The issue were two defect cables... Sorry for bothering you and thanks for your ideas. It works as expected with a good cable.

8

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.