-.TH "GPIO" "14 June 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
+.TH "GPIO" "21st October 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
.SH NAME
gpio \- Command-line access to Raspberry Pi and PiFace GPIO
.PP
.B gpio
.B [ \-g ]
-.B read/write/pwm/mode ...
+.B read/write/wb/pwm/mode ...
.PP
.B gpio
.B [ \-p ]
-.B read/write/mode
+.B read/write/wb
.B ...
.PP
.B gpio
+.B readall
+.PP
+.B gpio
.B unexportall/exports
.PP
.B gpio
range
.PP
.B gpio
-.B load \ i2c/spi
+.B load \ i2c/spi ...
.PP
.B gpio
.B gbr
diagnostic purposes, but can be used in shell scripts for general if
somewhat slow control of the GPIO pins.
+It can also control the IO's on the PiFace IO board and load the SPI and I2C
+kernel modules if required.
+
Additionally, it can be used to set the exports in the \fI/sys/class/gpio\fR
system directory to allow subsequent programs to use the \fR/sys/class/gpio\fR
interface without needing to be run as root.
.TP
.B \-v
-Output the current version
+Output the current version including the board revision of the Raspberry Pi.
.TP
.B \-g
Use the BCM_GPIO pins numbers rather than wiringPi pin numbers.
+\fINOTE:\fR The BCM_GPIO pin numbers are always used with the
+export and edge commands.
.TP
.B \-p
Use the PiFace interface board and its corresponding pin numbers.
.TP
-.B read
+.B read <pin>
Read the digital value of the given pin and print 0 or 1 to represent the
respective logic levels.
.TP
-.B write
-Write the given value (0 or 1) to the pin.
+.B write <pin> <value>
+Write the given value (0 or 1) to the pin. You need to set the pin
+to output mode first.
+
+.TP
+.B wb <value>
+Write the given byte to the 8 main GPIO pins. You can prefix it with 0x
+to specify a hexadecimal number. You need to set pins to output mode
+first.
+
+.TP
+.B readall
+Output a table of all GPIO pins values. The values represent the actual values read
+if the pin is in input mode, or the last value written if the pin is in output
+mode.
.TP
-.B pwm
+.B pwm <pin> <value>
Write a PWM value (0-1023) to the given pin.
.TP
-.B mode
+.B mode <pin> <mode>
Set a pin into \fIinput\fR, \fIoutput\fR or \fIpwm\fR mode. Can also
use the literals \fIup\fR, \fIdown\fR or \fItri\fR to set the internal
pull-up, pull-down or tristate (off) controls.
Change the PWM range register. The default is 1024.
.TP
-.B load i2c/spi
-This loads the i2c or the spi drivers into the system and changes the permissions on
-the associated /dev/ entries so that the current user has access to them.
+.B load i2c [baudrate]
+This loads the i2c or drivers into the kernel and changes the permissions
+on the associated /dev/ entries so that the current user has access to
+them. Optionally it will set the I2C baudrate to that supplied (or as
+close as the Pi can manage) The default speed is 100Kb/sec.
+
+.TP
+.B load spi [buffer size in KB]
+This loads the the spi drivers into the kernel and changes the permissions
+on the associated /dev/ entries so that the current user has access to
+them. Optionally it will set the SPI buffer size to that supplied. The
+default is 4KB.
.TP
.B gbr
The board jumpers need to be in-place to do this operation.
-.SH "WiringPi vs. GPIO Pin numbering"
+.SH "WiringPi vs. BCM_GPIO Pin numbering"
.PP
.TS
20 - 31
.TE
+Note that "r1" and "r2" above refers to the board revision. Normally
+wiringPi detects the correct board revision with use for it's own
+numbering scheme, but if you are using a Revision 2 board with some
+of the pins which change numbers between revisions you will need
+to alter your software.
+
.SH FILES
.TP 2.2i
.SH "REPORTING BUGS"
-
Report bugs to <projects@drogon.net>
+
Please report bugs to <projects@drogon.net>
.SH COPYRIGHT
Copyright (c) 2012 Gordon Henderson
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+.SH TRADEMARKS AND ACKNOWLEDGEMENTS
+
+Raspberry Pi is a trademark of the Raspberry Pi Foundation. See
+http://raspberrypi.org/ for full details.
~ianmdlvl / wiringPi.git / blobdiff