IoTGateway/BSP/Android/Gettingstarted/How to use GPIO for rk - Revision history

Xingxing.li at 02:29, 26 October 2021

2021-10-26T02:29:58Z

Wei.zeng at 01:29, 11 April 2018

2018-04-11T01:29:51Z

Wei.zeng at 02:44, 16 November 2017

2017-11-16T02:44:13Z

Wei.zeng: Created page with "=== Configuration/Test === ==== Configuration ==== The RK3288 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" The num..."

2017-11-16T02:42:56Z

Created page with "=== Configuration/Test === ==== Configuration ==== The RK3288 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" The num..."

New page

=== Configuration/Test ===

==== Configuration ====

The RK3288 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" 

The numeric value of GPIO is calculated as follows:
<pre>32 x (gpio_bank) + gpio_bit - 8
</pre>

Group GPIO0 only 24 gpios,So each GPIO Num subtracts 8.

gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31

E.g. GPIO2_A4 becomes 60

===== RSB-4680 =====

{| style="width:500px" cellspacing="1" cellpadding="1" border="1"
|-
| GPIO Number
| GPIO formed
| Numeric Representation
|-
| GPIO0
| GPIO7_A3 
| 219 
|-
| GPIO1 
| GPIO7_A4 
| 220 
|-
| GPIO2 
| GPIO7_A5 
| 221 
|-
| GPIO3 
| GPIO7_C5 
| 237 
|-
| GPIO4 
| GPIO8_A2 
| 250 
|-
| GPIO5 
| GPIO8_A3 
| 251 
|-
| GPIO6 
| GPIO8_A0 
| 248 
|-
| GPIO7 
| GPIO8_A1 
| 249
|}

Test

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

Export GPIO 27
<pre># echo 27 > /sys/class/gpio/export
</pre>

Set GPIO direction to in/out
<pre># echo "out" > /sys/class/gpio/gpio27/direction
</pre>

Set GPIO value 0/1 if GPIO pin define is output
<pre># echo 1 > /sys/class/gpio/gpio27/value
</pre>

Used as IRQ signal

Note:You have to configure GPIO to input
<pre># echo "rising" > /sys/class/gpio/gpio27/edge
</pre>

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

Unexport GPIO 27
<pre># echo 27 > /sys/class/gpio/unexport
</pre>

==== Test ====

GPIO 27 and GPIO 29 are taken as an example:

*Connect GPIO 27 and GPIO 29
*Export GPIO 27 and GPIO 29
<pre># echo 27 /sys/class/gpio/export
# echo 29 /sys/class/gpio/export
</pre>

*Set GPIO 27 to output
<pre># echo "out" > /sys/class/gpio/gpio27/direction
</pre>

*Set GPIO 29 to input
<pre># echo "in" > /sys/class/gpio/gpio29/direction
</pre>

*Change GPIO 27 to 1 and read GPIO 29 value
<pre># echo 1 > /sys/class/gpio/gpio27/value
# cat /sys/class/gpio/gpio29/value
1
</pre>

*Change GPIO 27 to 0 and read GPIO 29 value
<pre># echo 0 > /sys/class/gpio/gpio27/value
# cat /sys/class/gpio/gpio29/value
0
</pre>

@@ Line 17: / Line 17: @@
 RSB-4680
-{| style="width:500px" cellspacing="1" cellpadding="1" border="1"
+{| cellspacing="1" cellpadding="1" border="1"
 |-
 | GPIO Number
@@ Line 114: / Line 114: @@
 <pre># echo 0 > /sys/class/gpio/gpio219/value
 # cat /sys/class/gpio/gpio220/value
 </pre>

@@ Line 60: / Line 60: @@
 Export GPIO then you can use control GPIO from userr space through sysfs
-Export GPIO 27
+Export GPIO0
-<pre># echo 27 > /sys/class/gpio/export
+<pre># echo 219 > /sys/class/gpio/export
 </pre>
 Set GPIO direction to in/out
-<pre># echo "out" > /sys/class/gpio/gpio27/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/gpio27/value
+<pre>#  echo 1 > /sys/class/gpio/gpio219/value
 </pre>
@@ Line 75: / Line 75: @@
 Note:You have to configure GPIO to input
-<pre>#  echo "rising" > /sys/class/gpio/gpio27/edge
+<pre>#  echo "rising" > /sys/class/gpio/gpio219/edge
 </pre>
@@ Line 83: / Line 83: @@
 *none: Disable interrupt on both edges
-Unexport GPIO 27
+Unexport GPIO0
-<pre># echo 27 > /sys/class/gpio/unexport
+<pre># echo 219 > /sys/class/gpio/unexport
 </pre>
 ==== Test ====
-GPIO 27 and GPIO 29 are taken as an example:
+GPIO 219 and GPIO 220 are taken as an example:
-*Connect GPIO 27 and GPIO 29
+*Connect GPIO 219 and GPIO 220
-*Export GPIO 27 and GPIO 29
+*Export GPIO 219 and GPIO 220
-<pre># echo 27 /sys/class/gpio/export
+<pre># echo 219 > /sys/class/gpio/export
-# echo 29 /sys/class/gpio/export
+# echo 220 > /sys/class/gpio/export
 </pre>
-*Set GPIO 27 to output
+*Set GPIO 219 to output
-<pre># echo "out" > /sys/class/gpio/gpio27/direction
+<pre># echo "out" > /sys/class/gpio/gpio219/direction
 </pre>
-*Set GPIO 29 to input
+*Set GPIO 220 to input
-<pre># echo "in" > /sys/class/gpio/gpio29/direction
+<pre># echo "in" > /sys/class/gpio/gpio220/direction
 </pre>
-*Change GPIO 27 to 1 and read GPIO 29 value
+*Change GPIO 219 to 1 and read GPIO 220 value
-<pre># echo 1 > /sys/class/gpio/gpio27/value
+<pre># echo 1 > /sys/class/gpio/gpio219/value
-# cat /sys/class/gpio/gpio29/value
+# cat /sys/class/gpio/gpio220/value
 </pre>
-*Change GPIO 27 to 0 and read GPIO 29 value
+*Change GPIO 219 to 0 and read GPIO 220 value
-<pre># echo 0 > /sys/class/gpio/gpio27/value
+<pre># echo 0 > /sys/class/gpio/gpio219/value
-# cat /sys/class/gpio/gpio29/value
+# cat /sys/class/gpio/gpio220/value
 </pre>

@@ Line 11: / Line 11: @@
 Group GPIO0 only 24 gpios,So each GPIO Num subtracts 8.
-gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31
+gpio_bit&nbsp;: A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31
 E.g. GPIO2_A4 becomes 60
 RSB-4680
 {| style="width:500px" cellspacing="1" cellpadding="1" border="1"