Updates to the build process
Moved the extensions into wiringPi from gpio and made it more general purpose more so that RTB and anything else can dymanically add devices into wiringPi. Changes to GPIO to updates for the SPI and I2C module loads Added gpio unload for SPI and I2C. Added a new way to setup SPI - by passing the mode in. Support for the new Pi2 thing too
This commit is contained in:
Gordon Henderson
79
gpio/gpio.1
79
gpio/gpio.1
@@ -1,4 +1,4 @@
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.TH "GPIO" "March 2013" "Command-Line access to Raspberry Pi's GPIO"
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.TH "GPIO" "January 2015" "Command-Line access to Raspberry Pi's GPIO"
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.SH NAME
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gpio \- Command-line access to Raspberry Pi's GPIO
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@@ -21,7 +21,7 @@ gpio \- Command-line access to Raspberry Pi's GPIO
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.B ...
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.PP
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.B gpio
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.B readall/reset
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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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@@ -156,16 +156,6 @@ The readall command is usable with an extension module (via the -x parameter),
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but it's unable to determine pin modes or states, so will perform both a
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digital and analog read on each pin in-turn.
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.TP
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.B reset
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Resets the GPIO - As much as it's possible to do. All pins are set to
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input mode and all the internal pull-up/down resistors are disconnected
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(tristate mode).
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The reset command is usable with an extension module (via the -x parameter),
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but it's limited to turning the pin into input mode (if applicable) and
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removing any pull up/down resistor.
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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. The pin needs to be put
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@@ -182,6 +172,8 @@ 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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The ALT modes can also be set using \fIalt0\fR, \fIalt1\fR, ... \fIalt5\fR.
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.TP
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.B unexportall
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Un-Export all the GPIO pins in the /sys/class/gpio directory.
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@@ -257,12 +249,30 @@ on the associated /dev/ entries so that the current user has access to
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them. Optionally it will set the I2C baudrate to that supplied in Kb/sec
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(or as close as the Pi can manage) The default speed is 100Kb/sec.
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Note that on a Pi with a recent 3.18 kernel with the device-tree structure
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enable, the load may fail until you add:
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.I dtparam=i2c=on
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into \fB/boot/config.txt\fR to allow user use of the I2C bus.
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.TP
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.B load spi [buffer size in KB]
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.B load spi
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This loads the spi drivers into the kernel and changes the permissions
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on the associated /dev/ entries so that the current user has access to
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them. Optionally it will set the SPI buffer size to that supplied. The
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default is 4KB.
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them. It used to have the ability to change the buffer size from the
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default of 4096 bytes to an arbitary value, however for some time the
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Pi Foundation have compiled the SPI device driver into the kernel and
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this has fixed the buffer size. The way to change it now is to edit
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the /boot/cmdline.txt file and add on spdev.bufsiz=8192 to set it to
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e.g. 8192 bytes then reboot.
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Note that on a Pi with a recent 3.18 kernel with the device-tree structure
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enable, the load may fail until you add:
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.I dtparam=spi=on
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into \fB/boot/config.txt\fR to allow user use of the I2C bus.
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.TP
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.B gbr
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@@ -280,41 +290,12 @@ 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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.SH "WiringPi vs. BCM_GPIO Pin numbering"
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.SH "WiringPi vs. BCM_GPIO Pin numbering vs. Physical pin numbering"
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.PP
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.TS
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c c c c l.
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WiringPi GPIO-r1 GPIO-r2 P1-Phys Function
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_
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0 17 17 11
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1 18 18 12 (PWM)
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2 21 27 13
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3 22 22 15
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4 23 23 16
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5 24 24 18
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6 25 25 22
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7 4 4 7
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8 0 2 3 I2C: SDA0
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9 1 3 5 I2C: SCL0
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10 8 8 24 SPI: CE0
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11 7 7 26 SPI: CE1
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12 10 10 19 SPI: MOSI
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13 9 9 21 SPI: MISO
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14 11 11 23 SPI: SCLK
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15 14 14 8 TxD
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16 15 16 10 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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Note that "r1" and "r2" above refers to the board revision. Normally
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wiringPi detects the correct board revision with use for it's own
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numbering scheme, but if you are using a Revision 2 board with some
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of the pins which change numbers between revisions you will need
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to alter your software.
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The quickest way to get a list of the pin differences is to run the command
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.TP
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gpio readall
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.SH FILES
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@@ -361,7 +342,7 @@ Please report bugs to <projects@drogon.net>
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.SH COPYRIGHT
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Copyright (c) 2012-2013 Gordon Henderson
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Copyright (c) 2012-2015 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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