Re: pyserial.tools.list_port improvement for FreeBSD

By the way, most of develkits use USB-TO-UART chip that have unusable
serial number because with many boards having the same VID:PID and
serial number it is not possible to distinguish them o_O

It would be nice to add chip customization to pyserial :-)

I found two kinda broken old utilities to update CP2102 USB-TO-UART
chips that may serve as reference point :-)

C: https://github.com/DiUS/cp210x-cfg
Python: https://github.com/cederom/cp210x-program

The first one uses LibUSB 1.0. After minor tweaks on FreeBSD I made it
to compile, work, and burn the new serial.. maybe I will create a Port
for this nice utility :-)

From what I read this is one time only operation but that is okay I
will add random stuff :-)

% ./cp210x-cfg
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: 0001

% dd if=/dev/random count=1M | md5
1048576+0 records in
1048576+0 records out
76f24aad88225fedf7260bb4f54c525d
536870912 bytes transferred in 3.788303 secs (141718053 bytes/sec)

% ./cp210x-cfg -h
Syntax:
cp210x-cfg [-h ] |
           [-m vid:pid] [-d bus:dev]
           [ -l | [-V vid] [-P pid] [-F flush] [-M mode] [-N name] [-S serial]]

  -h            This help
  -m vid:pid    Find and use first device with vid:pid
  -d bus:dev    Find and use device at bus:dev
  -l            List all CP210x devices connected
  -V vid        Program the given Vendor ID
  -P pid        Program the given Product ID
  -F flush      Program the given buffer flush bitmap (CP2105 only)
  -M mode       Program the given SCI/ECI mode (CP2105 only)
  -N name       Program the given product name string
  -S serial     Program the given serial string

Unless the -d option is used, the first found CP210x device is used.
If no programming options are used, the current values are printed.


% ./cp210x-cfg -S 76f24aad88225fedf7260bb4f54c525d
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: 76f24aad88225fedf7260bb4f54c525d

% ./cp210x-cfg
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: 76f24aad88225fedf7260bb4f54c525d


I would not be myself not to try write serial again knowing it it
supposedly one time only operation :-)

% ./cp210x-cfg -S CeDeROM76f24aad88225fedf7260bb4f54c525d
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: CeDeROM76f24aad88225fedf7260bb4f54c525d

% ./cp210x-cfg
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: CeDeROM76f24aad88225fedf7260bb4f54c525d

% ./cp210x-cfg -S ESP32DEVKITC-CDR-76f24aad88225fedf7260bb4f54c525d
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: ESP32DEVKITC-CDR-76f24aad88225fedf7260bb4f54c525d

% ./cp210x-cfg
ID 10c4:ea60 @ bus 000, dev 007: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: ESP32DEVKITC-CDR-76f24aad88225fedf7260bb4f54c525d

Very cool, looks like this chip has Flash not the OTP and we can
assign whatever serial string we want :-)

Have a good weekend folks :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info