GPIO Driver - Revision history

FabienM at 15:41, 12 December 2011

2011-12-12T15:41:48Z

FabienM at 07:46, 11 October 2011

2011-10-11T07:46:39Z

FabienM at 07:46, 11 October 2011

2011-10-11T07:46:12Z

FabienM at 07:45, 11 October 2011

2011-10-11T07:45:50Z

FabienM: /* Driver usage */

2011-01-18T17:26:41Z

‎Driver usage

JulienB: /* Examples */

2010-02-15T14:45:10Z

‎Examples

JulienB: /* Examples: */

2010-02-15T14:38:00Z

‎Examples:

JulienB: Be more precise for interrupts

2009-11-01T09:16:24Z

Be more precise for interrupts

JulienB: move ioctl C interface before /proc one

2009-10-29T11:31:54Z

move ioctl C interface before /proc one

JulienB: some precisions

2009-10-29T11:30:29Z

some precisions

← Older revision		Revision as of 15:41, 12 December 2011
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−	{{~~Note~~\| This article describe the method to use gpio with armadeus '''version < 4.0'''. To use gpio on armadeus '''version 4.0''' or more see [[GPIOlib]]}}	+	{{Warning\| This article describe the method to use gpio with armadeus '''version < 4.0'''. To use gpio on armadeus '''version 4.0''' or more see [[GPIOlib]]}}

← Older revision		Revision as of 07:46, 11 October 2011
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−	{{Note\| This article describe the ~~methode~~ to use gpio with armadeus '''version < 4.0'''. To use gpio on armadeus '''version 4.0''' or more see [[GPIOlib]]}}	+	{{Note\| This article describe the method to use gpio with armadeus '''version < 4.0'''. To use gpio on armadeus '''version 4.0''' or more see [[GPIOlib]]}}

← Older revision		Revision as of 07:46, 11 October 2011
Line 1:		Line 1:
−	{{Note\| This article describe the methode to use gpio with armadeus version < 4.0. To use gpio on armadeus version 4.0 or more see [[GPIOlib]]}}	+	{{Note\| This article describe the methode to use gpio with armadeus '''version < 4.0'''. To use gpio on armadeus '''version 4.0''' or more see [[GPIOlib]]}}

← Older revision		Revision as of 07:45, 11 October 2011
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		+	{{Note\| This article describe the methode to use gpio with armadeus version < 4.0. To use gpio on armadeus version 4.0 or more see [[GPIOlib]]}}
		+
		+
	On this page, you will find all the informations needed to use the Armadeus GPIO driver.		On this page, you will find all the informations needed to use the Armadeus GPIO driver.

← Older revision		Revision as of 17:26, 18 January 2011
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	== Driver usage ==		== Driver usage ==
		+
		+	=== As_devices ===
		+
		+	GPIO can be use with library [[AsDevices]].

	=== Directly with shell commands (through /proc & /dev filesystem) ===		=== Directly with shell commands (through /proc & /dev filesystem) ===

@@ Line 69: / Line 69: @@
   # echo -ne "\x00" > /dev/gpio/PD31
   # echo -ne "\x01" > /dev/gpio/PD31
 </pre>

@@ Line 33: / Line 33: @@
 # ''/proc/drivers/gpio/portXpullup'': (de)activate i.MX internal pull-up for that GPIO
-====Examples:====
+====Examples====
 * Configure IO-Pin 31 of port A (LCD_OE_ACD on the APF27) as GPIO (not reversible):
 <pre class="apf">

@@ Line 30: / Line 30: @@
 # use ''/proc/drivers/gpio/portXdir'' to read (with ''cat'') or set (with ''echo'') pin direction (where X is your port name)
 # then use ''/proc/drivers/gpio/portX'' to read (with ''cat'') or write (with ''echo'') pin status
-# ''/proc/drivers/gpio/portXirq'': configure if GPIO should be used as an interruptible one (ie blocking read)
+# ''/proc/drivers/gpio/portXirq'': to configure GPIO as an interrupt (blocking read); 0-> no interrupt, 1-> rising edge, 2-> falling edge, 3-> both edges
 # ''/proc/drivers/gpio/portXpullup'': (de)activate i.MX internal pull-up for that GPIO

@@ Line 100: / Line 100: @@
 * A test script is available in ''target/test/'' : [http://armadeus.git.sourceforge.net/git/gitweb.cgi?p=armadeus/armadeus;a=blob;f=target/test/test_gpio.sh;h=e2e54e855aeb25b0f0cbae5915930e9f904861dc;hb=HEAD test_gpio.sh]
 === Directly with C program: /proc filesystem===
-{{Note|For performance please use IOCTL instead (see next chapter)}}
+{{Note|For performance please use IOCTL instead (see above)}}
 After inserting the GPIO module, /proc entries are created in the
@@ Line 148: / Line 160: @@
      return (0);
 </source>
 == Links ==

@@ Line 1: / Line 1: @@
 On this page, you will find all the informations needed to use the Armadeus GPIO driver.
 ==Compilation==
-Done by default starting from Armadeus-3.0 release. See [[Talk:GPIO_Driver]] to know how.
+Since Armadeus-3.0 release, gpio driver is compiled and installed by default in rootfs. See [[Talk:GPIO_Driver]] to know how.
-==Installation==
+You have 2 modules:
-When compiled, you will have 2 modules:
 * gpio: this is the main driver. It should be loaded first and will allow you to easily control GPIO pins from user space,
 * ppdev: this is an extension driver to add PPDEV emulation to gpio.ko. This way you will be able to emulate a standard parallel port on one GPIO port (to connect a textual LCD, for example).
-{{Note|The parallel port driver (ppdev) will only work on [[APF9328]] based systems !}}
+{{Note|The parallel port driver (ppdev) will only work on [[APF9328]] based systems for now !}}
 ===Loading driver===
@@ Line 26: / Line 26: @@
 === Directly with shell commands (through /proc & /dev filesystem) ===
-GPIO driver is configurable through /proc interface:
+GPIO driver is usable through its /proc interface:
-* use ''/proc/drivers/gpio/portXmode'' to configure a pin as a gpio (with ''echo'') and  where X is your port name: A, B, C or D (E,F for apf27)
+# use ''/proc/drivers/gpio/portXmode'' to configure a pin as a gpio (with ''echo'') and  where X is your port name: A, B, C or D (E,F for apf27)
-* use ''/proc/drivers/gpio/portXdir'' to read (with ''cat'') or set (with ''echo'') pin direction (where X is your port name)
+# use ''/proc/drivers/gpio/portXdir'' to read (with ''cat'') or set (with ''echo'') pin direction (where X is your port name)
-* then use ''/proc/drivers/gpio/portX'' to read (with ''cat'') or write (with ''echo'') pin status
+# then use ''/proc/drivers/gpio/portX'' to read (with ''cat'') or write (with ''echo'') pin status
-* ''/proc/drivers/gpio/portXirq'': configure if GPIO should be used as an interruptible one (ie blocking read)
+# ''/proc/drivers/gpio/portXirq'': configure if GPIO should be used as an interruptible one (ie blocking read)
-* ''/proc/drivers/gpio/portXpullup'': (de)activate i.MXL internal pull-up for that GPIO
+# ''/proc/drivers/gpio/portXpullup'': (de)activate i.MX internal pull-up for that GPIO
 ====Examples:====