在Linux系統(tǒng)有如下報錯，或導致串口號異常變化

[235788.049659] usb usb3-port9: disabled by hub (EMI?), re-enabling...

[235788.049664] usb 3-9: USB disconnect, device number 5

[235788.050135] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050138] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050139] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050139] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050154] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050155] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050157] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050158] usb_ch9344 3-9:1.0: usb_bulk_msg(send) failed, err -19

[235788.050389] usb_ch9344 3-9:1.0: ch9344 usb device disconnect.

[235788.273149] usb 3-9: new high-speed USB device number 30 using xhci_hcd

[235788.399455] usb 3-9: New USB device found, idVendor=1a86, idProduct=55d9, bcdDevice= 1.36

[235788.399460] usb 3-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0

[235788.399461] usb 3-9: Product: USB2.0 To Multi Serial Ports

[235788.399463] usb 3-9: Manufacturer: wch.cn

[235788.402262] usb_ch9344 3-9:1.0: ttyCH9344USB from 8 - 15: ch9344 device attached.

各路大神，有遇到過的嗎

您好，如上信息提示和硬件工作狀態(tài)有關，即USB通訊不穩(wěn)定導致。出現(xiàn)串口變號的根本原因是：打開串口節(jié)點的時候USB硬件發(fā)生了物理掉線。

可檢查設計原理圖和PCB，如外部使用了延長線連接，那么可嘗試縮短線材/使用帶屏蔽線材等。