How to use GPIO - Revision history

Xingxing.li at 00:50, 6 June 2023

2023-06-06T00:50:34Z

Xingxing.li at 07:07, 1 March 2023

2023-03-01T07:07:36Z

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Xingxing.li at 01:59, 22 October 2021

2021-10-22T01:59:17Z

Zhengguang.yang at 07:38, 27 April 2018

2018-04-27T07:38:55Z

Zhengguang.yang: Created page with "=== Configuration/Test === ==== Configuration ==== The general-purpose interface combines eight general-purpose input/output (GPIO) banks. Each GPIO module provides 32 dedi..."

2018-04-27T01:48:53Z

Created page with "=== Configuration/Test === ==== Configuration ==== The general-purpose interface combines eight general-purpose input/output (GPIO) banks. Each GPIO module provides 32 dedi..."

New page

=== Configuration/Test ===

==== Configuration ====

The general-purpose interface combines eight general-purpose input/output (GPIO) banks.

Each GPIO module provides 32 dedicated general-purpose pins with input and output capabilities; thus, the general-purpose interface supports up to 256 (8 × 32) pins.

The numeric value of GPIO is calculated as follows:
<pre>32 x (gpio_bank - 1) + gpio_bit</pre>

ROM-7510

{| style="width: 500px;" cellpadding="1" cellspacing="1" border="1"
|-
| GPIO Number
| Linux OS(/sys/class/gpio/)
| Default direction
|-
| GPIO0
| gpio97 
| in 
|-
| GPIO1 
| gpio218 
| in 
|-
| GPIO2 
| gpio98 
| in 
|-
| GPIO3 
| gpio219 
| in 
|-
| GPIO4 
| gpio100 
| in 
|-
| GPIO5 
| gpio68 
| in 
|-
| GPIO6 
| gpio101 
| in 
|-
| GPIO7 
| gpio69 
| in
|}

Test

Export GPIO then you can use control GPIO from userr space through sysfs

Export GPIO0
<pre># echo 97 > /sys/class/gpio/export
</pre>

Set GPIO direction to in/out
<pre># echo "out" > /sys/class/gpio/gpio97/direction
</pre>

Set GPIO value 0/1 if GPIO pin define is output
<pre># echo 1 > /sys/class/gpio/gpio219/value
</pre>

Used as IRQ signal

Note:You have to configure GPIO to input
<pre># echo "rising" > /sys/class/gpio/gpio97/edge
</pre>

*rising: Trigger on rising edge
*falling: Trigger on falling edge
*both: Trigger on both edges
*none: Disable interrupt on both edges

Unexport GPIO0
<pre># echo 97 > /sys/class/gpio/unexport
</pre>

==== Test ====

GPIO 97 and GPIO 218 are taken as an example:

*Connect GPIO 97 and GPIO 218
*Export GPIO 97 and GPIO 218
<pre># echo 97 > /sys/class/gpio/export
# echo 218 > /sys/class/gpio/export
</pre>

*Set GPIO 97 to output
<pre># echo "out" > /sys/class/gpio/gpio97/direction
</pre>

*Set GPIO 218 to input
<pre># echo "in" > /sys/class/gpio/gpio218/direction
</pre>

*Change GPIO 97 to 1 and read GPIO 218 value
<pre># echo 1 > /sys/class/gpio/gpio97/value
# cat /sys/class/gpio/gpio218/value
1
</pre>

*Change GPIO 97 to 0 and read GPIO 218 value
<pre># echo 0 > /sys/class/gpio/gpio97/value
# cat /sys/class/gpio/gpio218/value
0
</pre>

@@ Line 146: / Line 146: @@
 |}
 = Test =
-Here we take GPIO1 of 4710 as an example.3710 and 5780 are&nbsp;similar to set up.
+'''Export GPIO then you can use control GPIO from user space through sysfs.'''
-Export GPIO1
+Export GPIO0
-<pre># echo 72 > /sys/class/gpio/export
+<pre># echo 34 > /sys/class/gpio/export
 </pre>
 Set GPIO direction to in/out
-<pre># echo "out" > /sys/class/gpio/gpio72/direction
+<pre># echo "out" > /sys/class/gpio/gpio34/direction
 </pre>
 Set GPIO value 0/1 if GPIO pin define is output
-<pre>#  echo 1 > /sys/class/gpio/gpio72/value
+<pre>#  echo 1 > /sys/class/gpio/gpio34/value
 </pre>
@@ Line 168: / Line 167: @@
 Note:You have to configure GPIO to input
-<pre>#  echo "rising" > /sys/class/gpio/gpio72/edge
+<pre>#  echo "rising" > /sys/class/gpio/gpio34/edge
 </pre>
@@ Line 176: / Line 175: @@
 *none: Disable interrupt on both edges
-Unexport GPIO1
+Unexport GPIO0
-<pre># echo 72 > /sys/class/gpio/unexport
+<pre># echo 34 > /sys/class/gpio/unexport
 </pre>
 '''Test'''
-GPIO1 and GPIO2 are taken as an example:
+GPIO0 and GPIO1 are taken as an example:
-*Connect GPIO1 and GPIO2
+*Connect GPIO0 and GPIO1
-*Export GPIO1 and GPIO2
+*Export GPIO0 and GPIO1
-<pre># echo 72 > /sys/class/gpio/export
+<pre># echo 34 > /sys/class/gpio/export
-# echo 50 > /sys/class/gpio/export
+# echo 35 > /sys/class/gpio/export
 </pre>
 *Set GPIO 1 to output
-<pre># echo "out" > /sys/class/gpio/gpio72/direction
+<pre># echo "out" > /sys/class/gpio/gpio34/direction
 </pre>
 *Set GPIO 2 to input
-<pre># echo "in" > /sys/class/gpio/gpio50/direction
+<pre># echo "in" > /sys/class/gpio/gpio35/direction
 </pre>
-*Change GPIO1 to 1 and read GPIO2value
+*Change GPIO 0 to 1 and read GPIO 2 value
-<pre># echo 1 > /sys/class/gpio/gpio72/value
+<pre># echo 1 > /sys/class/gpio/gpio34/value
-# cat /sys/class/gpio/gpio50/value
+# cat /sys/class/gpio/gpio35/value
 </pre>
-*Change GPIO1&nbsp;to 0 and read GPIO2&nbsp;value
+*Change GPIO 0&nbsp;to 0 and read GPIO 2&nbsp;value
-<pre># echo 0 > /sys/class/gpio/gpio72/value
+<pre># echo 0 > /sys/class/gpio/gpio34/value
-# cat /sys/class/gpio/gpio50/value
+# cat /sys/class/gpio/gpio35/value
 </pre>
 </pre>

@@ Line 3: / Line 3: @@
 ==== Configuration ====
-The general-purpose interface combines eight general-purpose input/output (GPIO) banks.
+The RK3288 bank/bit notation for GPIOs must be formed&nbsp;as&nbsp;"GPIO&lt;GPIO_bank&gt;_&lt;gpio_bit&gt;"&nbsp;
-Each GPIO module provides 32 dedicated general-purpose pins with input and output capabilities; thus, the general-purpose interface supports up to 256 (8 × 32) pins.
+The numeric value of GPIO&nbsp;is calculated as follows:
-The numeric value of GPIO&nbsp;is calculated as follows:
+E.g. GPIO2_A4 becomes 60
-ROM-7510
+RSB-4680
-{| cellpadding="1" cellspacing="1" border="1" style="width: 500px;"
+{| cellspacing="1" cellpadding="1" border="1"
 |-
 | GPIO Number
-| Linux OS(/sys/class/gpio/)
+| GPIO formed
-| Default direction
+| Numeric Representation
 |-
 | GPIO0
-| gpio97<br/>
+| GPIO7_A3<br/>
-| in<br/>
+| 219<br/>
 |-
 | GPIO1<br/>
-| gpio218<br/>
+| GPIO7_A4<br/>
-| in<br/>
+| 220<br/>
 |-
 | GPIO2<br/>
-| gpio98<br/>
+| GPIO7_A5<br/>
-| in<br/>
+| 221<br/>
 |-
 | GPIO3<br/>
-| gpio219<br/>
+| GPIO7_C5<br/>
-| in<br/>
+| 237<br/>
 |-
 | GPIO4<br/>
-| gpio100<br/>
+| GPIO8_A2<br/>
-| in<br/>
+| 250<br/>
 |-
 | GPIO5<br/>
-| gpio68<br/>
+| GPIO8_A3<br/>
-| in<br/>
+| 251<br/>
 |-
 | GPIO6<br/>
-| gpio101<br/>
+| GPIO8_A0<br/>
-| in<br/>
+| 248<br/>
 |-
 | GPIO7<br/>
-| gpio69<br/>
+| GPIO8_A1<br/>
-| in
+| 249
 |}
@@ Line 56: / Line 61: @@
 Export GPIO0
-<pre># echo 97 > /sys/class/gpio/export
+<pre># echo 219 > /sys/class/gpio/export
 </pre>
 Set GPIO direction to in/out
-<pre># echo "out" > /sys/class/gpio/gpio97/direction
+<pre># echo "out" > /sys/class/gpio/gpio219/direction
 </pre>
 Set GPIO value 0/1 if GPIO pin define is output
-<pre>#  echo 1 > /sys/class/gpio/gpio97/value
+<pre>#  echo 1 > /sys/class/gpio/gpio219/value
 </pre>
@@ Line 70: / Line 75: @@
 Note:You have to configure GPIO to input
-<pre>#  echo "rising" > /sys/class/gpio/gpio97/edge
+<pre>#  echo "rising" > /sys/class/gpio/gpio219/edge
 </pre>
@@ Line 79: / Line 84: @@
 Unexport GPIO0
-<pre># echo 97 > /sys/class/gpio/unexport
+<pre># echo 219 > /sys/class/gpio/unexport
 </pre>
 ==== Test ====
-GPIO&nbsp;97 and GPIO&nbsp;218 are taken as an example:
+GPIO 219 and GPIO 220 are taken as an example:
-*Connect GPIO&nbsp;97 and GPIO 218
+*Connect GPIO 219 and GPIO 220
-*Export GPIO&nbsp;97 and GPIO 218
+*Export GPIO 219 and GPIO 220
-<pre># echo 97 > /sys/class/gpio/export
+<pre># echo 219 > /sys/class/gpio/export
-# echo 218 > /sys/class/gpio/export
+# echo 220 > /sys/class/gpio/export
 </pre>
-*Set GPIO&nbsp;97 to output
+*Set GPIO 219 to output
-<pre># echo "out" > /sys/class/gpio/gpio97/direction
+<pre># echo "out" > /sys/class/gpio/gpio219/direction
 </pre>
-*Set GPIO 218 to input
+*Set GPIO 220 to input
-<pre># echo "in" > /sys/class/gpio/gpio218/direction
+<pre># echo "in" > /sys/class/gpio/gpio220/direction
 </pre>
-*Change GPIO&nbsp;97 to 1 and read GPIO&nbsp;218 value
+*Change GPIO 219 to 1 and read GPIO 220 value
-<pre># echo 1 > /sys/class/gpio/gpio97/value
+<pre># echo 1 > /sys/class/gpio/gpio219/value
-# cat /sys/class/gpio/gpio218/value
+# cat /sys/class/gpio/gpio220/value
 </pre>
-*Change GPIO&nbsp;97 to 0 and read GPIO 218 value
+*Change GPIO 219 to 0 and read GPIO 220 value
-<pre># echo 0 > /sys/class/gpio/gpio97/value
+<pre># echo 0 > /sys/class/gpio/gpio219/value
-# cat /sys/class/gpio/gpio218/value
+# cat /sys/class/gpio/gpio220/value
 </pre>