-.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
.B ...
.PP
.B gpio
+.B readall
+.PP
+.B gpio
.B unexportall/exports
.PP
.B gpio
.SH DESCRIPTION
.B GPIO
-is a swiss army knofe of a command line tool to allow the user easy
+is a swiss army knife of a command line tool to allow the user easy
access to the GPIO pins on the Raspberry Pi and the SPI A/D and D/A
-convertors on the Gertboard. It's designed for simple testing and
+converters on the Gertboard. It's designed for simple testing and
diagnostic purposes, but can be used in shell scripts for general if
somewhat slow control of the GPIO pins.
.TP
.B \-v
-Output the current version
+Output the current version including the board revision of the Raspberry Pi.
.TP
.B \-g
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
+.B write <pin> <value>
Write the given value (0 or 1) to the pin.
.TP
-.B pwm
+.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 <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.
above and note that \fBBCM_GPIO\fR pin number is used not not wiringPi pin
numbering.
-Like the export commands abovem ownership is set to that of the
+Like the export commands above, ownership is set to that of the
calling user, allowing subsequent access from user programs without
requiring root/sudo.
.B gbr
channel
-This reads the analog to digital convertor on the Gertboard on the given
+This reads the analog to digital converter on the Gertboard on the given
channel. The board jumpers need to be in-place to do this operation.
.TP
channel value
This writes the supplied value to the output channel on the Gertboards
-SPI digital to analogue convertor.
+SPI digital to analogue converter.
The board jumpers need to be in-place to do this operation.
.PP
.TS
-r r l.
-WiringPi GPIO Function
+r r r l.
+WiringPi GPIO-r1 GPIO-r2 Function
_
-0 17
-1 18 (PWM)
-2 21
-3 22
-4 23
-5 24
-6 25
-7 4
-8 0 SDA0
-9 1 SCL0
-10 8 SPI CE0
-11 7 SPI CE1
-12 10 SPI MOSI
-13 9 SPI MISO
-14 11 SPI SCLK
-15 14 TxD
-16 15 RxD
+0 17 17
+1 18 18 (PWM)
+2 21 27
+3 22 22
+4 23 23
+5 24 24
+6 25 25
+7 4 4
+8 0 2 I2C: SDA0
+9 1 3 I2C: SCL0
+10 8 8 SPI: CE0
+11 7 7 SPI: CE1
+12 10 10 SPI: MOSI
+13 9 9 SPI: MISO
+14 11 11 SPI: SCLK
+15 14 14 TxD
+16 15 16 RxD
+17 - 28
+18 - 29
+19 - 30
+20 - 31
.TE
.SH FILES
.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.