.\" Copyright (c) 2018-2020 Robin Getz
.\" Copyright (c) 2018-2020 Analog Devices Inc.
.\"
.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, see
.\" <http://www.gnu.org/licenses/>.
.\" %%%LICENSE_END
.\"
.TH iio_writedev 1 "05 April 2024" "libiio-0.25" "LibIIO Utilities"
.IX iio_writedev_
.SH NAME
iio_writedev \- write buffers on an IIO device
.SH SYNOPSIS
.B iio_writedev
[
.I options
]
[-t <trigger>] [-T <timeout-ms>] [-b <buffer-size>] [-s <samples>] <iio_device> [<channel> ...]
.SH DESCRIPTION
.B iio_reg
is a utility for writing buffers from connected IIO devices.

.SH OPTIONS
.TP
.B \-h, \-\-help
Tells
.I iio_writedev
to display some help, and then quit.
.TP
.B \-V, \-\-version
Prints the version information for this particular copy of
.I iio_writedev
and the version of the libiio library it is using. This is useful for knowing if the version of the library and
.I iio_writedev
on your system are up to date. This is also useful when reporting bugs.
.TP
.B \-S, \-\-scan [backends]
Scan for available IIO contexts, optional arg of specific backend(s) 'ip', 'usb' or 'ip:usb'.
Specific options for USB include Vendor ID, Product ID to limit scanning to specific devices 'usb=0456,b673'.
vid,pid are hexadecimal numbers (no prefix needed), "*" (match any for pid only)
If no argument is given, it checks all that are available.
.TP
.B \-t \-\-trigger
Use the specified trigger, if needed on the specified channel
.TP
.B \-b \-\-buffer-size
Size of the capture buffer. Default is 256.
.TP
.B \-s \-\-samples
Number of samples (not bytes) to capture, 0 = infinite. Default is 0.
.TP
.B \-T \-\-timeout
Buffer timeout in milliseconds. 0 = no timeout. Default is 0.
.TP
.B \-c \-\-cyclic
Use cyclic buffer mode.
.TP
.B \-u, \-\-uri
The Uniform Resource Identifier
.I (uri)
for connecting to devices, can be one of:
.RS
.IP ip:[address]
network address, either numeric (192.168.0.1) or network hostname
.IP ip:
blank, if compiled with zeroconf support, will find an IIO device on network
.IP usb:[device:port:instance]
normally returned from
.B iio_writedev -S
.IP serial:[port],[baud],[settings]
which are controlled, and need to match the iiod (or tinyiiod) on the other end of the serial port.
.RS
.IP [port]
is something like '/dev/ttyUSB0' on Linux, and 'COM4' on Windows.
.IP [baud]
is is normally one of 110, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200 [default], 128000 or 256000, but can vary system to system.
.IP [settings]
would normally be configured as '8n1' this is controlled by:
.RS
.IP data_bits:
(5, 6, 7, 8 [default], or 9)
.IP parity_bits:
('n' none [default], 'o' odd, 'e' even, 'm' mark, or 's' space)
.IP stop_bits:
(1 [default, or 2)
.IP flow_control:
('0' none [default], 'x' Xon Xoff, 'r' RTSCTS, or 'd' DTRDSR)
.RE
.RE
.IP local:
with no address part.
.RE

.SH RETURN VALUE
If the specified device is not found, a non-zero exit code is returned.

.SH "USAGE"
.PP 
You use iio_writedev in the same way you use many of the other libiio utilities.
You should specify a IIO device, and the specific channel to write. Since this is a write, channels must be output.
If no channel is provided, iio_writedev will write to all output channels.
If no device is provided, iio_writedev will print a few examples:
.RS
.B \f(CWiio_writedev -a\fP
.br
Using auto-detected IIO context at URI "usb:3.10.5"
.br
Example : iio_writedev -u usb:3.10.5 -b 256 -s 1024 cf-ad9361-dds-core-lpc voltage0
.br
Example : iio_writedev -u usb:3.10.5 -b 256 -s 1024 cf-ad9361-dds-core-lpc voltage1
.br
Example : iio_writedev -u usb:3.10.5 -b 256 -s 1024 cf-ad9361-dds-core-lpc voltage2
.br
Example : iio_writedev -u usb:3.10.5 -b 256 -s 1024 cf-ad9361-dds-core-lpc voltage3
.br
Example : iio_writedev -u usb:3.10.5 -b 256 -s 1024 cf-ad9361-dds-core-lpc
.RE
.PP
This sends 1024 samples of I and Q data to the USB attached AD9361. data is taking from standard in, in a binary format.
.RS
.B \f(CWiio_writedev \-a \-s 1024 cf-ad9361-dds-core-lpc voltage0 voltage1 < ./samples.dat\fP
.RE


.SH "SEE ALSO"
.ad l
.BR iio_attr (1),
.BR iio_info (1),
.BR iio_readdev (1),
.BR iio_reg (1),
.BR iio_writedev (1),
.BR libiio (3)
.PP
libiio home page:
.BR \%https://wiki.analog.com/resources/tools-software/linux-software/libiio
.PP
libiio code:
.BR \%https://github.com/analogdevicesinc/libiio
.PP
Doxygen for libiio
.BR \%https://analogdevicesinc.github.io/libiio/
.SH BUGS
All bugs are tracked at:
.BR \%https://github.com/analogdevicesinc/libiio/issues