ROM-6881 How to use GPIO - Revision history

Xingxing.li at 06:58, 3 January 2024

2024-01-03T06:58:36Z

Xingxing.li at 06:53, 3 January 2024

2024-01-03T06:53:01Z

Xingxing.li at 06:52, 3 January 2024

2024-01-03T06:52:13Z

Xingxing.li at 05:44, 3 January 2024

2024-01-03T05:44:23Z

Xingxing.li: Created page with " = Configuration = The RK3588 bank/bit notation for GPIOs must be formed as "GPIO_" The numeric value of GPIO is calculated as foll..."

2023-11-27T01:44:03Z

Created page with " = Configuration = The RK3588 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" The numeric value of GPIO is calculated as foll..."

New page

= Configuration =

The RK3588 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
</pre>

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

E.g. GPIO3_A0 becomes 96

== ROM-6881 ==

{| border="1" cellpadding="1" cellspacing="1"
|-
| GPIO Number
| GPIO formed
| Numeric Representation
|-
| GPIO0
| Ext-GPIO0 P00
| 493
|-
| GPIO1
| Ext-GPIO0 P01
| 494
|-
| GPIO2
| Ext-GPIO0 P02
| 495
|-
| GPIO3
| Ext-GPIO0 P03
| 496
|-
| GPIO4
| Ext-GPIO0 P04
| 497
|-
| GPIO5
| GPIO4_B5
| 141
|-
| GPIO6
| Ext-GPIO0 P05
| 498
|-
| GPIO7
| Ext-GPIO0 P06
| 499
|-
| GPIO8
| Ext-GPIO0 P07
| 500
|-
| GPIO9
| GPIO4_A0
| 128
|-
| GPIO10
| GPIO3_C0
| 112
|-
| GPIO11
| GPIO3_C1
| 113
|}

= Test =

Here we take GPIO0 of ROM-6881 as an example.

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

Export GPIO0
<pre># echo 493 > /sys/class/gpio/export
</pre>

Set GPIO direction to in/out
<pre># echo "out" > /sys/class/gpio/gpio493/direction
</pre>

Set GPIO value 0/1 if GPIO pin define is output
<pre># echo 1 > /sys/class/gpio/gpio493/value
</pre>

Used as IRQ signal

Note:You have to configure GPIO to input
<pre># echo "rising" > /sys/class/gpio/gpio493/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 493 > /sys/class/gpio/unexport
</pre>

'''Test'''

GPIO0 and GPIO1 are taken as an example:

*Connect GPIO0 and GPIO1
*Export GPIO0 and GPIO1
<pre># echo 493 > /sys/class/gpio/export
# echo 494 > /sys/class/gpio/export
</pre>

*Set GPIO0 to output
<pre># echo "out" > /sys/class/gpio/gpio493/direction
</pre>

*Set GPIO2 to input
<pre># echo "in" > /sys/class/gpio/gpio494/direction
</pre>

*Change GPIO0 to 1 and read GPIO1 value
<pre># echo 1 > /sys/class/gpio/gpio493/value
# cat /sys/class/gpio/gpio494/value
1
</pre>

*Change GPIO0 to 0 and read GPIO1 value
<pre># echo 0 > /sys/class/gpio/gpio493/value
# cat /sys/class/gpio/gpio494/value
0</pre>

@@ Line 112: / Line 112: @@
 == GPIO Test ==
-GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1
+. GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1
 *'''Export GPIO0&nbsp;and GPIO1'''
@@ Line 134: / Line 134: @@
 # cat /sys/class/gpio/gpio494/value
 </pre>

@@ Line 75: / Line 75: @@
 . Short-circuit GPIO signals on CN9 with cable
-[[File:SOM-DB2510 CN9.PNG]]
+[[File:SOM-DB2510 CN9.PNG|RTENOTITLE]]
-= Test =
+== Test ==
 Here we take GPIO0&nbsp;of ROM-6881 as an example.

@@ Line 1: / Line 1: @@
-= Configuration =
+== Configuration ==
 The RK3588 bank/bit notation for GPIOs must be formed&nbsp;as&nbsp;"GPIO<GPIO_bank>_<gpio_bit>"&nbsp;
@@ Line 68: / Line 68: @@
 | style="width: 186px;" | 113
 |}
 = Test =
@@ Line 86: / Line 94: @@
 <pre>#  echo 1 > /sys/class/gpio/gpio493/value
 </pre>
 Unexport GPIO0
@@ Line 103: / Line 110: @@
 *none: Disable interrupt on both edges
-'''GPIO Test'''
+== GPIO Test ==
 GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1

@@ Line 14: / Line 14: @@
 == ROM-6881 ==
-{| border="1" cellpadding="1" cellspacing="1"
+{| border="1" cellpadding="1" cellspacing="1" style="width: 411px;"
 |-
 | GPIO Number
-| GPIO formed
+| style="width: 123px;" | GPIO formed
-| Numeric Representation
+| style="width: 186px;" | Numeric Representation
 |-
 | GPIO0
-| Ext-GPIO0 P00
+| style="width: 123px;" | Ext-GPIO0 P00
-| 493
+| style="width: 186px;" | 493
 |-
 | GPIO1
-| Ext-GPIO0 P01
+| style="width: 123px;" | Ext-GPIO0 P01
-| 494
+| style="width: 186px;" | 494
 |-
 | GPIO2
-| Ext-GPIO0 P02
+| style="width: 123px;" | Ext-GPIO0 P02
-| 495
+| style="width: 186px;" | 495
 |-
 | GPIO3
-| Ext-GPIO0 P03
+| style="width: 123px;" | Ext-GPIO0 P03
-| 496
+| style="width: 186px;" | 496
 |-
 | GPIO4
-| Ext-GPIO0 P04
+| style="width: 123px;" | Ext-GPIO0 P04
-| 497
+| style="width: 186px;" | 497
 |-
 | GPIO5
-| GPIO4_B5
+| style="width: 123px;" | GPIO4_B5
-| 141
+| style="width: 186px;" | 141
 |-
 | GPIO6
-| Ext-GPIO0 P05
+| style="width: 123px;" | Ext-GPIO0 P05
-| 498
+| style="width: 186px;" | 498
 |-
 | GPIO7
-| Ext-GPIO0 P06
+| style="width: 123px;" | Ext-GPIO0 P06
-| 499
+| style="width: 186px;" | 499
 |-
 | GPIO8
-| Ext-GPIO0 P07
+| style="width: 123px;" | Ext-GPIO0 P07
-| 500
+| style="width: 186px;" | 500
 |-
 | GPIO9
-| GPIO4_A0
+| style="width: 123px;" | GPIO4_A0
-| 128
+| style="width: 186px;" | 128
 |-
 | GPIO10
-| GPIO3_C0
+| style="width: 123px;" | GPIO3_C0
-| 112
+| style="width: 186px;" | 112
 |-
 | GPIO11
-| GPIO3_C1
+| style="width: 123px;" | GPIO3_C1
-| 113
+| style="width: 186px;" | 113
 |}
@@ Line 73: / Line 73: @@
 Here we take GPIO0&nbsp;of ROM-6881 as an example.
-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
@@ Line 85: / Line 85: @@
 Set GPIO value 0/1 if GPIO pin define is output
 <pre>#  echo 1 > /sys/class/gpio/gpio493/value
 </pre>
@@ Line 98: / Line 103: @@
 *none: Disable interrupt on both edges
-Unexport GPIO0
+'''GPIO Test'''
-'''Test'''
+GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1
-GPIO0&nbsp;and GPIO1&nbsp;are taken as an example:
+*'''Export GPIO0&nbsp;and GPIO1'''
 <pre># echo 493 > /sys/class/gpio/export
 # echo 494 > /sys/class/gpio/export
 </pre>
-*Set GPIO0&nbsp;to output
+*'''Set GPIO0 to output and GPIO1 to input'''
 <pre># echo "out" > /sys/class/gpio/gpio493/direction
 </pre>
-*Set GPIO2&nbsp;to input
+*'''Change GPIO0&nbsp;to 1 and read GPIO1 value'''
 <pre># echo 1 > /sys/class/gpio/gpio493/value
 # cat /sys/class/gpio/gpio494/value
@@ Line 126: / Line 123: @@
 </pre>
-*Change GPIO0&nbsp;to 0 and read GPIO1&nbsp;value
+*'''Change GPIO0&nbsp;to 0 and read GPIO1&nbsp;value'''
 <pre># echo 0 > /sys/class/gpio/gpio493/value
 # cat /sys/class/gpio/gpio494/value
 </pre>