xref: /freebsd/share/man/man4/uftdi.4 (revision a9d84a2ba7b4f96cea914b6142e93ae71373dcb7)

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.Dd March 31, 2014
.Dt UFTDI 4
.Os
.Sh NAME
.Nm uftdi
.Nd USB support for serial adapters based on the FTDI family of USB
serial adapter chips.
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device usb"
.Cd "device ucom"
.Cd "device uftdi"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
uftdi_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for various serial adapters based on the
following FTDI chips:
.Pp
.Bl -bullet -compact
.It
FT8U100AX
.It
FT8U232AM
.It
FT8U232BM
.It
FT232R
.It
FT2232C
.It
FT2232D
.It
FT2232H
.It
FT4232H
.It
FT230X
.El
.Pp
The device is accessed through the
.Xr ucom 4
driver which makes it behave like a
.Xr tty 4 .
.Pp
Many of the supported chips provide additional functionality
such as bitbang mode and the MPSSE engine for serial bus emulation.
The
.Nm
driver provides access to that functionality with the following
.Xr ioctl 2
calls, defined in
.In dev/usb/uftdiio.h :
.Bl -tag -width indent
.It Dv UFTDIIOC_RESET_IO Pq Vt int
Reset the channel to its default configuration, flush RX and TX FIFOs.
.It Dv UFTDIIOC_RESET_RX Pq Vt int
Flush the RX FIFO.
.It Dv UFTDIIOC_RESET_TX Pq Vt int
Flush the TX FIFO.
.It Dv UFTDIIOC_SET_BITMODE Pq Vt "struct uftdi_bitmode"
Put the channel into the operating mode specified in
.Va mode ,
and set the pins indicated by ones in
.Va iomask
to output mode.
The
.Va mode
must be one of the
.Va uftdi_bitmodes
values.
.Bd -literal
enum uftdi_bitmodes
{
	UFTDI_BITMODE_ASYNC = 0,
	UFTDI_BITMODE_MPSSE = 1,
	UFTDI_BITMODE_SYNC = 2,
	UFTDI_BITMODE_CPU_EMUL = 3,
	UFTDI_BITMODE_FAST_SERIAL = 4,
	UFTDI_BITMODE_CBUS = 5,
	UFTDI_BITMODE_NONE = 0xff,
};

struct uftdi_bitmode
{
	uint8_t mode;
	uint8_t iomask;
};
.Ed
.Pp
Manuals and application notes published by FTDI describe these
modes in detail.
To use most of these modes, you first put the channel into
the desired mode, then you
.Xr read 2
and
.Xr write 2
data which either reflects pin state or is interpreted
as MPSSE commands and parameters, depending on the mode.
.It Dv UFTDIIOC_GET_BITMODE Pq Vt "struct uftdi_bitmode"
Return the state of the bitbang pins at the time of the call in the
.Va iomask
member.
The
.Va mode
member is unused.
.It Dv UFTDIIOC_SET_ERROR_CHAR Pq Vt int
Set the character which is inserted into the buffer to mark
the point of an error such as FIFO overflow.
.It Dv UFTDIIOC_SET_EVENT_CHAR Pq Vt int
Set the character which causes a partial FIFO full of data
to be returned immediately even if the FIFO is not full.
.It Dv UFTDIIOC_SET_LATENCY Pq Vt int
Set the amount of time to wait for a full FIFO,
in milliseconds.
If more than this much time elapses without receiving a new
character, any characters in the FIFO are returned.
.It Dv UFTDIIOC_GET_LATENCY Pq Vt int
Get the current value of the latency timer.
.It Dv UFTDIIOC_GET_HWREV Pq Vt int
Get the hardware revision number.
This is the
.Va bcdDevice
value from the
.Va usb_device_descriptor .
.Sh HARDWARE
The
.Nm
driver supports the following adapters:
.Pp
.Bl -bullet -compact
.It
B&B Electronics USB->RS422/485 adapter
.It
Elexol USB MOD1 and USB MOD3
.It
HP USB-Serial adapter shipped with some HP laptops
.It
Inland UAS111
.It
QVS USC-1000
.It
Buffalo PC-OP-RS / Kurouto-shikou KURO-RS universal remote
.It
Prologix GPIB-USB Controller
.El
.Sh SEE ALSO
.Xr tty 4 ,
.Xr ucom 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Fx 4.8
from
.Nx 1.5 .