error: failed to read cfg item 3703: Input/Output Error

[pklapperich]

I sometimes get errors when reading CP2102 devices. I get the same errors when trying to write the NAME field. I haven't tried any other changes.

$ sudo cp210x-cfg -m 10c4:ea60
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
error: failed to read cfg item 3703: Input/Output Error
Serial: 55f11b71d8cdbac69d77ac99e08c527b
$ sudo cp210x-cfg -m 10c4:ea60
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
Name: CP2102N USB to UART Bridge Controller
Serial: 55f11b71d8cdbac69d77ac99e08c527b
$ sudo cp210x-cfg -m 10c4:ea60 -N FOO10R200
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
error: failed to set cfg item 3703: Pipe error
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
error: failed to read cfg item 3703: Input/Output Error
Serial: 55f11b71d8cdbac69d77ac99e08c527b

[cz172638]

i tried set serial on linkit 7697 which has cp2102n.
further investigation led to
https://www.silabs.com/documents/public/application-notes/AN978-cp210x-usb-to-uart-api-specification.pdf
and https://www.silabs.com/documents/public/application-notes/an976-cp2102-3-4-9-to-cp2102n-porting-guide.pdf and https://www.silabs.com/documents/public/application-notes/AN721.pdf

AN978 satements:
CP210x_SetConfig() Programs the entire configuration of a CP2102N device.
CP210x_GetConfig() Gets the entire configuration of a CP2102N device as a byte array.
CP210x_GetXXXXXXX() calls usually works also on CP2102N, but some only on non-N versions.

also contains full description of CP2102N configuration array.

btw it would be worth to poke at https://github.com/remakeelectric/cp210xmanufacturing

[irrwisch1]

I forked the project and added support for the newer cp2102n chips
https://github.com/irrwisch1/cp210x-cfg