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Man Pages
UCHCOM(4) FreeBSD Kernel Interfaces Manual UCHCOM(4)

uchcom
WinChipHead CH341/CH340 serial adapter driver

To compile this driver into the kernel, place the following lines in your kernel configuration file:
device usb
device ucom
device uchcom

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

uchcom_load="YES"

The uchcom driver provides support for the WinChipHead CH341/CH340 USB-to-RS-232 Bridge chip.

The device is accessed through the ucom(4) driver which makes it behave like a tty(4).

The uchcom driver supports the following adapters:

  • HL USB-RS232

/dev/ttyU*
for callin ports
/dev/ttyU*.init
 
/dev/ttyU*.lock
corresponding callin initial-state and lock-state devices

/dev/cuaU*
for callout ports
/dev/cuaU*.init
 
/dev/cuaU*.lock
corresponding callout initial-state and lock-state devices

tty(4), ucom(4), usb(4)

The uchcom driver first appeared in NetBSD. The first FreeBSD release to include it was FreeBSD 8.0.

Actually, this chip seems unable to drive other than 8 data bits and 1 stop bit line.
April 26, 2017 FreeBSD 13.1-RELEASE

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