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257 lines
6.8 KiB
Groff
257 lines
6.8 KiB
Groff
.\" $NetBSD: uftdi.4,v 1.5 2002/02/07 03:15:08 ross Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Lennart Augustsson.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 6, 2015
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.Dt UFTDI 4
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.Os
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.Sh NAME
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.Nm uftdi
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.Nd USB support for serial adapters based on the FTDI family of USB
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serial adapter chips.
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device usb"
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.Cd "device ucom"
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.Cd "device uftdi"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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uftdi_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for various serial adapters based on the
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following FTDI chips:
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.Pp
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.Bl -bullet -compact
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.It
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FT8U100AX
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.It
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FT8U232AM
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.It
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FT8U232BM
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.It
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FT232R
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.It
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FT2232C
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.It
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FT2232D
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.It
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FT2232H
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.It
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FT4232H
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.It
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FT230X
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.El
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.Pp
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The device is accessed through the
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.Xr ucom 4
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driver which makes it behave like a
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.Xr tty 4 .
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.Pp
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Many of the supported chips provide additional functionality
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such as bitbang mode and the MPSSE engine for serial bus emulation.
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The
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.Nm
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driver provides access to that functionality with the following
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.Xr ioctl 2
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calls, defined in
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.In dev/usb/uftdiio.h :
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.Bl -tag -width indent
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.It Dv UFTDIIOC_RESET_IO Pq Vt int
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Reset the channel to its default configuration, flush RX and TX FIFOs.
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.It Dv UFTDIIOC_RESET_RX Pq Vt int
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Flush the RX FIFO.
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.It Dv UFTDIIOC_RESET_TX Pq Vt int
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Flush the TX FIFO.
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.It Dv UFTDIIOC_SET_BITMODE Pq Vt "struct uftdi_bitmode"
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Put the channel into the operating mode specified in
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.Va mode ,
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and set the pins indicated by ones in
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.Va iomask
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to output mode.
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The
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.Va mode
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must be one of the
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.Va uftdi_bitmodes
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values.
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Setting
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.Va mode
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to
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.Dv UFTDI_BITMODE_NONE
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returns the channel to standard UART mode.
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.Bd -literal
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enum uftdi_bitmodes
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{
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UFTDI_BITMODE_ASYNC = 0,
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UFTDI_BITMODE_MPSSE = 1,
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UFTDI_BITMODE_SYNC = 2,
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UFTDI_BITMODE_CPU_EMUL = 3,
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UFTDI_BITMODE_FAST_SERIAL = 4,
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UFTDI_BITMODE_CBUS = 5,
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UFTDI_BITMODE_NONE = 0xff,
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};
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struct uftdi_bitmode
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{
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uint8_t mode;
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uint8_t iomask;
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};
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.Ed
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.Pp
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Manuals and application notes published by FTDI describe these
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modes in detail.
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To use most of these modes, you first put the channel into
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the desired mode, then you
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.Xr read 2
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and
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.Xr write 2
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data which either reflects pin state or is interpreted
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as MPSSE commands and parameters, depending on the mode.
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.It Dv UFTDIIOC_GET_BITMODE Pq Vt "struct uftdi_bitmode"
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Return the current bitbang mode in the
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.Va mode
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member, and the state of the DBUS0..DBUS7 pins at the time
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of the call in the
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.Va iomask
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member.
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The pin state can be read while the chip is in any mode, including
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.Dv UFTDI_BITMODE_NONE
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(UART) mode.
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.It Dv UFTDIIOC_SET_ERROR_CHAR Pq Vt int
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Set the character which is inserted into the buffer to mark
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the point of an error such as FIFO overflow.
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.It Dv UFTDIIOC_SET_EVENT_CHAR Pq Vt int
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Set the character which causes a partial FIFO full of data
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to be returned immediately even if the FIFO is not full.
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.It Dv UFTDIIOC_SET_LATENCY Pq Vt int
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Set the amount of time to wait for a full FIFO,
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in milliseconds.
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If more than this much time elapses without receiving a new
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character, any characters in the FIFO are returned.
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.It Dv UFTDIIOC_GET_LATENCY Pq Vt int
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Get the current value of the latency timer.
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.It Dv UFTDIIOC_GET_HWREV Pq Vt int
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Get the hardware revision number.
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This is the
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.Va bcdDevice
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value from the
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.Va usb_device_descriptor .
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.It Dv UFTDIIOC_READ_EEPROM Pq Vt "struct uftdi_eeio"
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Read one or more words from the configuration eeprom.
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The FTDI chip performs eeprom I/O in 16-bit words.
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Set
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.Va offset
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and
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.Va length
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to values evenly divisible by two before the call, and the
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.Va data
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array will contain the requested values from eeprom after the call.
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.Bd -literal
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struct uftdi_eeio
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{
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uint16_t offset;
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uint16_t length;
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uint16_t data[64];
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};
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.Ed
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.Pp
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The FT232R chip has an internal eeprom.
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An external serial eeprom is optional on other FTDI chips.
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The eeprom may contain 64, 128, or 256 words,
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depending on the part used.
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Multiple calls may be needed to read or write the larger parts.
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When no eeprom is present, all words in the returned data are 0xffff.
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An erased eeprom also reads as all 0xffff.
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.It Dv UFTDIIOC_WRITE_EEPROM Pq Vt "struct uftdi_eeio"
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Write one or more words to the configuration eeprom.
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The
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.Va uftdi_eeio
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values are as described for
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.Dv UFTDIIOC_READ_EEPROM .
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.Pp
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The FTDI chip does a blind write to the eeprom, and it will appear
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to succeed even when no eeprom is present.
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To ensure a good write you must read back and verify the data.
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It is
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.Em not
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necessary to erase before writing.
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Any position within the eeprom can be overwritten at any time.
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.It Dv UFTDIIOC_ERASE_EEPROM Pq Vt int
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Erase the entire eeprom.
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This is useful primarily for test and debugging, as there is no
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need to erase before writing.
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To help prevent accidental erasure caused by calling the wrong
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ioctl, you must pass the special value
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.Dv UFTDI_CONFIRM_ERASE
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as the argument to this ioctl.
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.El
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.Sh HARDWARE
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The
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.Nm
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driver supports the following adapters:
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.Pp
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.Bl -bullet -compact
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.It
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B&B Electronics USB->RS422/485 adapter
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.It
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Elexol USB MOD1 and USB MOD3
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.It
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HP USB-Serial adapter shipped with some HP laptops
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.It
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Inland UAS111
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.It
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QVS USC-1000
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.It
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Buffalo PC-OP-RS / Kurouto-shikou KURO-RS universal remote
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.It
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Prologix GPIB-USB Controller
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.El
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.Sh SEE ALSO
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.Xr tty 4 ,
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.Xr ucom 4 ,
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.Xr usb 4
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.Sh HISTORY
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The
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.Nm
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driver
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appeared in
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.Fx 4.8
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from
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.Nx 1.5 .
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