Difference between revisions of "How to use GPIO"

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−
=== Configuration/Test ===
 
  
−
==== Configuration ====
+
= Configuration =
  
−
The RK3288 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" 
+
The RK3399 bank/bit notation for GPIOs must be formed&nbsp;as&nbsp;"GPIO<GPIO_bank>_<gpio_bit>"&nbsp;
  
 
The numeric value of GPIO&nbsp;is calculated as follows:
 
The numeric value of GPIO&nbsp;is calculated as follows:
−
<pre>32 x (gpio_bank) + gpio_bit - 8
+
<pre>32 x (gpio_bank) + gpio_bit
 
</pre>
 
</pre>
  
−
Group GPIO0 only 24 gpios,So each GPIO Num subtracts 8.
+
gpio_bit&nbsp;: A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31
 +
 
 +
E.g. GPIO2_B0&nbsp;becomes 72
 +
 
 +
== ROM-5780 ==
 +
 
 +
{| border="1" cellpadding="0" cellspacing="1" width="500"
 +
|-
 +
|
 +
GPIO Number
 +
 
 +
|
 +
GPIO formed
 +
 
 +
|
 +
Numeric Representation
 +
 
 +
|-
 +
|
 +
GPIO0
 +
 
 +
|
 +
GPIO1_A2
  
−
gpio_bit&nbsp;: A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31
+
|
 +
34
 +
 
 +
|-
 +
|
 +
GPIO1
  
−
E.g. GPIO2_A4 becomes 60
+
|
 +
GPIO1_A3
  
−
RSB-4680
+
|
 +
35
  
−
{| cellspacing="1" cellpadding="1" border="1"
 
 
|-
 
|-
−
| GPIO Number
+
|  
−
| GPIO formed
+
GPIO2
−
| Numeric Representation
+
 
 +
|  
 +
GPIO1_B1
 +
 
 +
|  
 +
41
 +
 
 
|-
 
|-
−
| GPIO0
+
|  
−
| GPIO7_A3<br/>
+
GPIO3
−
| 219<br/>
+
 
 +
|
 +
GPIO1_B2
 +
 
 +
|
 +
42
 +
 
 +
|-
 +
|
 +
GPIO4
 +
 
 +
|  
 +
GPIO1_B5
 +
 
 +
|  
 +
45
 +
 
 
|-
 
|-
−
| GPIO1<br/>
+
|  
−
| GPIO7_A4<br/>
+
GPIO5
−
| 220<br/>
+
 
 +
|  
 +
GPIO1_C2
 +
 
 +
|  
 +
50
 +
 
 
|-
 
|-
−
| GPIO2<br/>
+
|  
−
| GPIO7_A5<br/>
+
GPIO6
−
| 221<br/>
+
 
 +
|  
 +
GPIO1_C4
 +
 
 +
|  
 +
52
 +
 
 
|-
 
|-
−
| GPIO3<br/>
+
|  
−
| GPIO7_C5<br/>
+
GPIO7
−
| 237<br/>
+
 
 +
|  
 +
GPIO1_C6
 +
 
 +
|  
 +
54
 +
 
 
|-
 
|-
−
| GPIO4<br/>
+
|  
−
| GPIO8_A2<br/>
+
GPIO8
−
| 250<br/>
+
 
 +
|  
 +
GPIO1_C7
 +
 
 +
|  
 +
55
 +
 
 
|-
 
|-
−
| GPIO5<br/>
+
|  
−
| GPIO8_A3<br/>
+
GPIO9
−
| 251<br/>
+
 
 +
|  
 +
GPIO2_A2
 +
 
 +
|  
 +
66
 +
 
 
|-
 
|-
−
| GPIO6<br/>
+
|  
−
| GPIO8_A0<br/>
+
GPIO10
−
| 248<br/>
+
 
 +
|  
 +
GPIO2_A3
 +
 
 +
|  
 +
67
 +
 
 
|-
 
|-
−
| GPIO7<br/>
+
|  
−
| GPIO8_A1<br/>
+
GPIO11
−
| 249
+
 
 +
|  
 +
GPIO4_C5
 +
 
 +
|  
 +
149
 +
 
 
|}
 
|}
  
−
Test
+
= 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 userr space through sysfs
 
Export GPIO then you can use control GPIO from userr space through sysfs
  
−
Export GPIO0
+
Export GPIO1
−
<pre># echo 219 > /sys/class/gpio/export
+
<pre># echo 72 > /sys/class/gpio/export
 
</pre>
 
</pre>
  
 
Set GPIO direction to in/out
 
Set GPIO direction to in/out
−
<pre># echo "out" > /sys/class/gpio/gpio219/direction
+
<pre># echo "out" > /sys/class/gpio/gpio72/direction
 
</pre>
 
</pre>
  
 
Set GPIO value 0/1 if GPIO pin define is output
 
Set GPIO value 0/1 if GPIO pin define is output
−
<pre>#  echo 1 > /sys/class/gpio/gpio219/value
+
<pre>#  echo 1 > /sys/class/gpio/gpio72/value
 
</pre>
 
</pre>
  
Line 75: Line 168:
  
 
Note:You have to configure GPIO to input
 
Note:You have to configure GPIO to input
−
<pre>#  echo "rising" > /sys/class/gpio/gpio219/edge
+
<pre>#  echo "rising" > /sys/class/gpio/gpio72/edge
 
</pre>
 
</pre>
  
−
*rising: Trigger on rising edge
+
*rising: Trigger on rising edge  
−
*falling: Trigger on falling edge
+
*falling: Trigger on falling edge  
−
*both: Trigger on both edges
+
*both: Trigger on both edges  
−
*none: Disable interrupt on both edges
+
*none: Disable interrupt on both edges  
  
−
Unexport GPIO0
+
Unexport GPIO1
−
<pre># echo 219 > /sys/class/gpio/unexport
+
<pre># echo 72 > /sys/class/gpio/unexport
 
</pre>
 
</pre>
  
−
==== Test ====
+
'''Test'''
  
−
GPIO 219 and GPIO 220 are taken as an example:
+
GPIO1 and GPIO2 are taken as an example:
  
−
*Connect GPIO 219 and GPIO 220
+
*Connect GPIO1 and GPIO2
−
*Export GPIO 219 and GPIO 220
+
*Export GPIO1 and GPIO2
−
<pre># echo 219 > /sys/class/gpio/export
+
<pre># echo 72 > /sys/class/gpio/export
−
# echo 220 > /sys/class/gpio/export
+
# echo 50 > /sys/class/gpio/export
 
</pre>
 
</pre>
  
−
*Set GPIO 219 to output
+
*Set GPIO 1 to output  
−
<pre># echo "out" > /sys/class/gpio/gpio219/direction
+
<pre># echo "out" > /sys/class/gpio/gpio72/direction
 
</pre>
 
</pre>
  
−
*Set GPIO 220 to input
+
*Set GPIO 2 to input  
−
<pre># echo "in" > /sys/class/gpio/gpio220/direction
+
<pre># echo "in" > /sys/class/gpio/gpio50/direction
 
</pre>
 
</pre>
  
−
*Change GPIO 219 to 1 and read GPIO 220 value
+
*Change GPIO1 to 1 and read GPIO2value
−
<pre># echo 1 > /sys/class/gpio/gpio219/value
+
<pre># echo 1 > /sys/class/gpio/gpio72/value
−
# cat /sys/class/gpio/gpio220/value
+
# cat /sys/class/gpio/gpio50/value  
 
1
 
1
 
</pre>
 
</pre>
  
−
*Change GPIO 219 to 0 and read GPIO 220 value
+
*Change GPIO1&nbsp;to 0 and read GPIO2&nbsp;value  
−
<pre># echo 0 > /sys/class/gpio/gpio219/value
+
<pre># echo 0 > /sys/class/gpio/gpio72/value
−
# cat /sys/class/gpio/gpio220/value
+
# cat /sys/class/gpio/gpio50/value  
 
0</pre>
 
0</pre>
 +
 +
&nbsp;

Revision as of 09:07, 1 March 2023

Configuration

The RK3399 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" 

The numeric value of GPIO is calculated as follows: 

32 x (gpio_bank) + gpio_bit

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

E.g. GPIO2_B0 becomes 72

ROM-5780

GPIO Number

GPIO formed

Numeric Representation

GPIO0

GPIO1_A2

34

GPIO1

GPIO1_A3

35

GPIO2

GPIO1_B1

41

GPIO3

GPIO1_B2

42

GPIO4

GPIO1_B5

45

GPIO5

GPIO1_C2

50

GPIO6

GPIO1_C4

52

GPIO7

GPIO1_C6

54

GPIO8

GPIO1_C7

55

GPIO9

GPIO2_A2

66

GPIO10

GPIO2_A3

67

GPIO11

GPIO4_C5

149

Test

Here we take GPIO1 of 4710 as an example.3710 and 5780 are similar to set up.

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

Export GPIO1 

# echo 72 > /sys/class/gpio/export

Set GPIO direction to in/out 

# echo "out" > /sys/class/gpio/gpio72/direction

Set GPIO value 0/1 if GPIO pin define is output 

#  echo 1 > /sys/class/gpio/gpio72/value

Used as IRQ signal

Note:You have to configure GPIO to input 

#  echo "rising" > /sys/class/gpio/gpio72/edge
  • rising: Trigger on rising edge
  • falling: Trigger on falling edge
  • both: Trigger on both edges
  • none: Disable interrupt on both edges

Unexport GPIO1 

# echo 72 > /sys/class/gpio/unexport

Test

GPIO1 and GPIO2 are taken as an example:

  • Connect GPIO1 and GPIO2
  • Export GPIO1 and GPIO2 
# echo 72 > /sys/class/gpio/export
# echo 50 > /sys/class/gpio/export
  • Set GPIO 1 to output 
# echo "out" > /sys/class/gpio/gpio72/direction
  • Set GPIO 2 to input 
# echo "in" > /sys/class/gpio/gpio50/direction
  • Change GPIO1 to 1 and read GPIO2value 
# echo 1 > /sys/class/gpio/gpio72/value
# cat /sys/class/gpio/gpio50/value 
1
  • Change GPIO1 to 0 and read GPIO2 value 
# echo 0 > /sys/class/gpio/gpio72/value
# cat /sys/class/gpio/gpio50/value 
0

 

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