204 lines
6.0 KiB
Groff
204 lines
6.0 KiB
Groff
.\" Copyright (c) 2018 by S.F.T. Inc.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd "15 April 2018"
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.Dt spi 8
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.Os
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.Sh NAME
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.Nm spi
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.Nd communicate on SPI bus with slave devices
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar device
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.Op Fl d Ar r|w|rw
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.Op Fl m Ar mode
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.Op Fl s Ar max-speed
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.Op Fl c Ar count
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.Op Fl C Ar cmd_bytes
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.Op Fl A
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.Op Fl b
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.Op Fl L
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.Op Fl v
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.Nm
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.Op Fl i
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.Op Fl f Ar device
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.Op Fl v
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.Nm
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.Op Fl h
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.Sh DESCRIPTION
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The
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.Nm
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utility can be used to perform raw data transfers
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.Pq read, write, or simultaneous read/write
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with devices on the SPI bus, via the
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.Xr spigen 4
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device.
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.Pp
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Each
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.Xr spigen 4
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device is associated with a specific
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.Sq chip select
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.Pq cs
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pin on the spibus, and therefore needs to be specified.
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If no device name is specified on the command line,
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.Nm
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assumes
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.Sq spigen0.0 .
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.Pp
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For more information on the spigen device, see
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.Xr spigen 4 .
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.Pp
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The options are as follows:
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.Bl -tag -width ".Fl f Ar device"
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.It Fl A
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Specifies ASCII mode.
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Both read and write data is input and output as
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2-character hexadecimal values, optionally separated by white space,
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such as 00 01 02 etc.
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When combined with the
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.Sq -b
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flag, the data on stdin remains a sequence of ASCII hexadecimal
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byte values, but the output reverts to binary mode.
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.It Fl b
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Binary
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.Pq output
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mode.
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Only has an effect when
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.Sq -A
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has been specified.
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Reverts the output back to binary
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.Pq rather than ASCII ,
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while leaving the input format as-is.
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Use in combination with
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.Sq -A
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to allow using something like
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.Sq echo
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to pass hexadecimal values to the SPI device, but output the received data
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on stdout as binary.
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.It Fl C Ar command bytes
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Sends one or more
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.Sq command
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bytes, skipping any bytes read-in during the transfer.
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The byte values should be specified as a quoted parameter, similar to the
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format for data on stdin for
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.Sq -A ,
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that is, 2 character hexadecimal values, optionally separated by white space.
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An SPI device will typically require that a command be sent, followed by
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bytes of data.
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You can use this option to send the command without receiving any data bytes
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during the command sequence.
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.It Fl c Ar count
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The total number of bytes to transfer as a decimal integer.
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If a write or a read/write transaction is being performed, and fewer than
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this number of bytes are read in from stdin, the remaining bytes will be
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sent with a value of
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.Sq 0 .
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If the length can be determined from the input file size, you can use a
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.Sq count
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value of
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.Sq -1
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to base the transfer on the input file's size.
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.It Fl d Ar r|w|rw
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Transfer direction: Use
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.Sq r
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for read,
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.Sq w for write, and
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.Sq rw
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for simultaneous read and write.
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.It Fl f Ar device
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SPI device to use
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.Pq default is /dev/spigen0 .
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.It Fl h
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Print help text to stderr, explaining the command line options.
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.It Fl i
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Displays information about the SPI device to stderr.
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Whenever this flag is specified, no data is read or written, and the mode
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and clock speed are not changed.
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.It Fl L
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LSB bit order.
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The default is MSB, i.e., the highest order bit is
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transmitted first.
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Specifying -L caused the LSB to be transmitted and read first.
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.It Fl m Ar 0 - 3
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SPI mode, 0 through 3.
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This defines the clock phase and timing with respect to reading and writing
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data, as per the SPI specification.
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.It Fl s Ar speed
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Specify the maximum speed, in Hz, for the SPI clock.
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The bus will operate at its highest available speed which does not
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exceed this maximum.
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.It Fl v
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Specifies Verbose mode.
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Diagnostics and information are written to stderr.
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You can specify
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.Sq -v
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more than once to increase verbosity.
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.El
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.Sh EXAMPLES
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Here are a few examples of using the spi utility:
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.Bl -bullet
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.It
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Get information about the default SPI device
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.Pp
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spi -i
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.It
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Set the maximum clock speed to 200Khz and the mode to 3 on spigen0.1, but do
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not transmit nor receive any data
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.Pp
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spi -f spigen0.1 -s 200000 -m 3
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.It
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Send a command sequence consisting of 2 bytes, and read 2 additional bytes
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from the SPI device, using the current mode and speed on the default device
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.Pp
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spi -d r -C "00 01" -c 2
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.It
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Transmit a byte value of 5, and receive 2 bytes, displaying their values as
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2-byte ASCII hexadecimal, with mode 2, and a maximum clock speed of 500khz.
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.Pp
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echo "05" | spi -A -d rw -m 2 -s 500000 -c 2
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.It
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Send a binary file, and output the SPI result through
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.Sq od
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as hexadecimal bytes, using the current maximum clock speed and SPI mode.
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.Pp
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spi -d rw -c -1 <input_file.bin | od -An -t x1
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.It
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Send 2 bytes of data, receive a total of 4 bytes, and output the SPI result
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as binary data, piped through
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.Sq od ,
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displaying it as two hexadecimal unsigned short integer values.
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.Pp
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echo "00 01" | spi -A -b -d rw -c 4 | od -t x2
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.It
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Query the manufacturer ID and size from a standard spiflash device, by
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sending the command byte 0x9f and displaying the 3-byte reply in ASCII hex.
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.Pp
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spi -f spigen0.0 -m 0 -s 1000000 -d r -c 3 -A -C 9f
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.El
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.Pp
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.Sh SEE ALSO
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.Xr spigen 4
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