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Gordon Henderson
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Philip Howard
Philip Howard
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gpio/gpio.1
79
gpio/gpio.1
@@ -1,4 +1,4 @@
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.TH "GPIO" "14 June 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
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.TH "GPIO" "21st October 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
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.SH NAME
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gpio \- Command-line access to Raspberry Pi and PiFace GPIO
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@@ -17,6 +17,9 @@ gpio \- Command-line access to Raspberry Pi and PiFace GPIO
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.B ...
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.PP
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.B gpio
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.B readall
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.PP
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.B gpio
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.B unexportall/exports
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.PP
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.B gpio
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@@ -48,9 +51,9 @@ channel value
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.SH DESCRIPTION
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.B GPIO
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is a swiss army knofe of a command line tool to allow the user easy
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is a swiss army knife of a command line tool to allow the user easy
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access to the GPIO pins on the Raspberry Pi and the SPI A/D and D/A
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convertors on the Gertboard. It's designed for simple testing and
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converters on the Gertboard. It's designed for simple testing and
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diagnostic purposes, but can be used in shell scripts for general if
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somewhat slow control of the GPIO pins.
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@@ -62,7 +65,7 @@ interface without needing to be run as root.
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.TP
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.B \-v
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Output the current version
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Output the current version including the board revision of the Raspberry Pi.
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.TP
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.B \-g
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@@ -73,20 +76,26 @@ Use the BCM_GPIO pins numbers rather than wiringPi pin numbers.
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Use the PiFace interface board and its corresponding pin numbers.
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.TP
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.B read
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.B read <pin>
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Read the digital value of the given pin and print 0 or 1 to represent the
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respective logic levels.
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.TP
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.B write
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.B write <pin> <value>
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Write the given value (0 or 1) to the pin.
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.TP
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.B pwm
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.B readall
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Output a table of all GPIO pins values. The values represent the actual values read
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if the pin is in input mode, or the last value written if the pin is in output
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mode.
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.TP
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.B pwm <pin> <value>
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Write a PWM value (0-1023) to the given pin.
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.TP
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.B mode
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.B mode <pin> <mode>
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Set a pin into \fIinput\fR, \fIoutput\fR or \fIpwm\fR mode. Can also
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use the literals \fIup\fR, \fIdown\fR or \fItri\fR to set the internal
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pull-up, pull-down or tristate (off) controls.
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@@ -122,7 +131,7 @@ the direction to input and set the edge interrupt method to \fInone\fR,
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above and note that \fBBCM_GPIO\fR pin number is used not not wiringPi pin
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numbering.
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Like the export commands abovem ownership is set to that of the
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Like the export commands above, ownership is set to that of the
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calling user, allowing subsequent access from user programs without
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requiring root/sudo.
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@@ -155,7 +164,7 @@ the associated /dev/ entries so that the current user has access to them.
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.B gbr
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channel
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This reads the analog to digital convertor on the Gertboard on the given
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This reads the analog to digital converter on the Gertboard on the given
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channel. The board jumpers need to be in-place to do this operation.
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.TP
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@@ -163,7 +172,7 @@ channel. The board jumpers need to be in-place to do this operation.
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channel value
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This writes the supplied value to the output channel on the Gertboards
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SPI digital to analogue convertor.
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SPI digital to analogue converter.
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The board jumpers need to be in-place to do this operation.
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@@ -171,26 +180,30 @@ The board jumpers need to be in-place to do this operation.
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.PP
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.TS
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r r l.
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WiringPi GPIO Function
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r r r l.
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WiringPi GPIO-r1 GPIO-r2 Function
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_
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0 17
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1 18 (PWM)
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2 21
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3 22
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4 23
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5 24
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6 25
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7 4
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8 0 SDA0
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9 1 SCL0
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10 8 SPI CE0
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11 7 SPI CE1
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12 10 SPI MOSI
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13 9 SPI MISO
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14 11 SPI SCLK
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15 14 TxD
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16 15 RxD
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0 17 17
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1 18 18 (PWM)
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2 21 27
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3 22 22
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4 23 23
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5 24 24
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6 25 25
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7 4 4
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8 0 2 I2C: SDA0
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9 1 3 I2C: SCL0
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10 8 8 SPI: CE0
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11 7 7 SPI: CE1
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12 10 10 SPI: MOSI
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13 9 9 SPI: MISO
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14 11 11 SPI: SCLK
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15 14 14 TxD
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16 15 16 RxD
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17 - 28
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18 - 29
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19 - 30
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20 - 31
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.TE
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.SH FILES
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@@ -234,10 +247,14 @@ Gordon Henderson
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.SH "REPORTING BUGS"
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Report bugs to <projects@drogon.net>
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Please report bugs to <projects@drogon.net>
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.SH COPYRIGHT
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Copyright (c) 2012 Gordon Henderson
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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.SH TRADEMARKS AND ACKNOWLEDGEMENTS
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Raspberry Pi is a trademark of the Raspberry Pi Foundation.
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