Changes between Version 6 and Version 7 of gpio

Timestamp:

09/27/2018 11:12:48 PM (6 years ago)

Author:

Tim Harvey

Comment:

updated formatting

gpio

@@ -63 +63 @@
 Here are some example use cases for using gpio-class via sysfs:
  * to see gpio names, config (direction), and current state: (requires debugfs kernel support and fs mounted)
-{{{
+{{{#!bash
 cat /sys/kernel/debug/gpio
 }}}
  * to export a GPIO that is available to userspace (ie provided by a gpio controller, not in-use by a kernel driver, and not already exported):
-{{{
+{{{#!bash
 echo 5 > /sys/class/gpio/export # export gpio5 (will create /sys/class/gpio/gpio5 and configure as input)
 echo out > /sys/class/gpio/gpio5/direction # make it an output
@@ -73 +73 @@
 }}}
  * to see the direction of a gpio via sysfs (only allowed for GPIO's configured as bi-directional)
-{{{
+{{{#!bash
 cat /sys/class/gpio/gpio5/direction  ;# in/out
 }}}
  * to set the direction of a gpio via sysfs (only allowed for GPIO's configured as bi-directional)
-{{{
+{{{#!bash
 echo out > /sys/class/gpio/gpio5/direction ;# set as output
 echo in > /sys/class/gpio/gpio5/direction ;# set as input
 }}}
  * to see the state of a gpio via sysfs
-{{{
+{{{#!bash
 cat /sys/class/gpio/gpio5/value  ;# show current state (0=low, any other value than 0=high)
 }}}
  * to set the state of a gpio via sysfs
-{{{
+{{{#!bash
 echo 0 > /sys/class/gpio/gpio5/value  ;# assert low
 echo 1 > /sys/class/gpio/gpio5/value  ;# assert high
@@ -100 +100 @@
 If debugfs is enabled in the kernel (as it is on Gateworks BSP's) you can see a nice table of GPIO mapping via {{{/sys/kernel/debug/gpio}}}. Some examples:
  * GW5400:
-{{{
+{{{#!bash
 # cat /sys/kernel/debug/gpio 
 GPIOs 0-31, platform/209c000.gpio, 209c000.gpio:
@@ -129 +129 @@
   * Note that this does not show GPIO's that are not used by Linux drivers such as USB HUB reset, Ethernet PHY reset, etc.
  * GW2388:
-{{{
+{{{#!bash
 # cat /sys/kernel/debug/gpio 
 GPIOs 0-31, cns3xxx_gpio0:
@@ -147 +147 @@
 }}}
  * GW2387:
-{{{
+{{{#!bash
 # cat /sys/kernel/debug/gpio 
 GPIOs 0-31, cns3xxx_gpio0:
@@ -169 +169 @@
  * Ventana:
   - IMX6 GPIOs: The IMX6 has 7 32bit GPIO controllers for a possible 224 fast ARM based GPIO's
-   - GPIO1_IO[0-31]: gpio0-gpio31
-   - GPIO2_IO[0-31]: gpio32-gpio63
-   - GPIO3_IO[0-31]: gpio64-gpio95
-   - GPIO4_IO[0-31]: gpio96-gpio127
-   - GPIO5_IO[0-31]: gpio128-gpio159
-   - GPIO6_IO[0-31]: gpio160-gpio191
-   - GPIO7_IO[0-31]: gpio192-gpio223
+   - GPIO1_IO![0-31]: gpio0-gpio31
+   - GPIO2_IO![0-31]: gpio32-gpio63
+   - GPIO3_IO![0-31]: gpio64-gpio95
+   - GPIO4_IO![0-31]: gpio96-gpio127
+   - GPIO5_IO![0-31]: gpio128-gpio159
+   - GPIO6_IO![0-31]: gpio160-gpio191
+   - GPIO7_IO![0-31]: gpio192-gpio223
   - [wiki:gsc GSC] GPIOs:
-   - GSC_GPIO_P0[0-7]: gpio240-gpio247
-   - GSC_GPIO_P1[0-7]: gpio247-gpio255
+   - GSC_GPIO_P0![0-7]: gpio240-gpio247
+   - GSC_GPIO_P1![0-7]: gpio247-gpio255
   - additional i2c based GPIO port-expanders present on some boards would begin at gpio116
  * Laguna:
   - cns3xxx GPIOs: The CNS3xxx has 2 32bit GPIO controllers for a possible 64 fast ARM based GPIO's
-   - GPIOA[0-31]: gpio0-gpio31
-   - GPIOB[0-31]: gpio32-gpio63
+   - GPIOA![0-31]: gpio0-gpio31
+   - GPIOB![0-31]: gpio32-gpio63
   - [wiki:gsc GSC] GPIOs:
-   - GSC_GPIO_P0[0-7]: gpio100-gpio107
-   - GSC_GPIO_P1[0-7]: gpio108-gpio115
+   - GSC_GPIO_P0![0-7]: gpio100-gpio107
+   - GSC_GPIO_P1![0-7]: gpio108-gpio115
   - additional i2c based GPIO port-expanders present on some boards would begin at gpio116
 
@@ -193 +193 @@
  * Laguna GPIOA8 would be the 9th IO on the GPIOA controller (the first is GPIOA0) thus map to gpio 0+8 = gpio-8
  * Laguna GPIOB1 would be the 2nd IO on the GPIOB controller thus map to gpio 32+2 = gpio-34
- * Ventana GPIO[1]:DIO16 is GPIO block 1 IO 16 thus maps to gpio0 + 16 (or 0*32+16) = gpio-16
- * Ventana GPIO[2]:DIO9 is GPIO block 2 IO 9 thus maps to gpio32 + 9 (or 1*32+9) = gpio-41
+ * Ventana GPIO![1]:DIO16 is GPIO block 1 IO 16 thus maps to gpio0 + 16 (or 0*32+16) = gpio-16
+ * Ventana GPIO![2]:DIO9 is GPIO block 2 IO 9 thus maps to gpio32 + 9 (or 1*32+9) = gpio-41
  * Equation: Ventana GPIO<x>__IO<y> is GPIO block x IO y thus maps to: gpio-((x-1)*32)+y
 
@@ -364 +364 @@
 
 Example usage (block until interrupt rising and falling edge interrupt occurs on gpio-100):
-{{{
+{{{#!bash
 root@OpenWrt:/# ./gpio-poll 100 both
 monitoring /sys/class/gpio/gpio100/value for interrupt using poll()