Yunjin.jiang at 04:00, 24 September 2025

2025-09-24T04:00:49Z

Yunjin.jiang: Created page with "
= Configuration = The RK3576 bank/bit notation for GPIOs must be formed as "GPIO_" The numeric value of GPIO is calcula..."

2025-09-24T03:59:03Z

Created page with " <br/> = Configuration = The RK3576 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" The numeric value of GPIO is calcula..."

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<br/> = Configuration =

The RK3576 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<br/> </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

 

== AOM-3841 ==

{| border="1" cellpadding="1" cellspacing="1"
|-
| GPIO Number
| GPIO formed
| Numeric Representation
|-
| GPIO3
|  GPIO0_B0
| 8
|-
| GPIO4
|  GPIO4_C5
| 149
|}

= Test =

Here we take GPIO3 of AOM-3841 as an example.

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

Export GPIO3
<pre># echo 8 > /sys/class/gpio/export
</pre>

Set GPIO direction to in/out
<pre># echo "out" > /sys/class/gpio/gpio8/direction
</pre>

Set GPIO value 0/1 if GPIO pin define is output
<pre># echo 1 > /sys/class/gpio/gpio8/value
</pre>

Used as IRQ signal

Note:You have to configure GPIO to input
<pre># echo "rising" > /sys/class/gpio/gpio8/edge
</pre>

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

Unexport GPIO3
<pre># echo 8 > /sys/class/gpio/unexport
</pre>

'''Test'''

GPIO3 and GPIO4 of AOM-3841 are taken as an example:

*Connect GPIO3 and GPIO4
*Export GPIO3 and GPIO4
<pre># echo 8 > /sys/class/gpio/export
# echo 149 > /sys/class/gpio/export
</pre>

*Set GPIO3 to output
<pre># echo "out" > /sys/class/gpio/gpio8/direction
</pre>

*Set GPIO4 to input
<pre># echo "in" > /sys/class/gpio/gpio149/direction
</pre>

*Change GPIO3 to 1 and read GPIO4 value
<pre># echo 1 > /sys/class/gpio/gpio8/value
# cat /sys/class/gpio/gpio149/value
1
</pre>

*Change GPIO3 to 0 and read GPIO4 value
<pre># echo 0 > /sys/class/gpio/gpio8/value
# cat /sys/class/gpio/gpio149/value
0</pre>

← Older revision		Revision as of 04:00, 24 September 2025
Line 1:		Line 1:

−	~~<br/>~~ = Configuration =	+	= Configuration =

	The RK3576 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>"		The RK3576 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>"

How to use GPIO RK3576 - Revision history

Yunjin.jiang at 04:00, 24 September 2025

Yunjin.jiang: Created page with " = Configuration = The RK3576 bank/bit notation for GPIOs must be formed as "GPIO_" The numeric value of GPIO is calcula..."

Yunjin.jiang: Created page with "
= Configuration = The RK3576 bank/bit notation for GPIOs must be formed as "GPIO_" The numeric value of GPIO is calcula..."