Difference between revisions of "How to use GPIO RK3568"
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== RSB-4810 == | == RSB-4810 == | ||
+ | |||
+ | {| cellspacing="1" cellpadding="1" border="1" | ||
+ | |- | ||
+ | | GPIO Number | ||
+ | | GPIO formed | ||
+ | | Numeric Representation | ||
+ | |- | ||
+ | | GPIO1<br/> | ||
+ | | GPIO3_A0<br/> | ||
+ | | 96 | ||
+ | |- | ||
+ | | GPIO2<br/> | ||
+ | | GPIO3_A2<br/> | ||
+ | | 98 | ||
+ | |- | ||
+ | | GPIO3<br/> | ||
+ | | GPIO3_A3<br/> | ||
+ | | 99 | ||
+ | |- | ||
+ | | GPIO4<br/> | ||
+ | | GPIO3_A4<br/> | ||
+ | | 100 | ||
+ | |- | ||
+ | | GPIO5<br/> | ||
+ | | GPIO3_A5<br/> | ||
+ | | 101 | ||
+ | |- | ||
+ | | GPIO6<br/> | ||
+ | | GPIO3_A6<br/> | ||
+ | | 102 | ||
+ | |} | ||
+ | |||
+ | == ROM-5880== | ||
{| cellspacing="1" cellpadding="1" border="1" | {| cellspacing="1" cellpadding="1" border="1" |
Revision as of 03:07, 12 April 2023
Contents
Configuration
The RK3568 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. GPIO3_A0 becomes 96
RSB-4810
GPIO Number | GPIO formed | Numeric Representation |
GPIO1 |
GPIO3_A0 |
96 |
GPIO2 |
GPIO3_A2 |
98 |
GPIO3 |
GPIO3_A3 |
99 |
GPIO4 |
GPIO3_A4 |
100 |
GPIO5 |
GPIO3_A5 |
101 |
GPIO6 |
GPIO3_A6 |
102 |
ROM-5880
GPIO Number | GPIO formed | Numeric Representation |
GPIO1 |
GPIO3_A0 |
96 |
GPIO2 |
GPIO3_A2 |
98 |
GPIO3 |
GPIO3_A3 |
99 |
GPIO4 |
GPIO3_A4 |
100 |
GPIO5 |
GPIO3_A5 |
101 |
GPIO6 |
GPIO3_A6 |
102 |
Test
Here we take GPIO1 of 4810 as an example.
Export GPIO then you can use control GPIO from userr space through sysfs
Export GPIO1
# echo 96 > /sys/class/gpio/export
Set GPIO direction to in/out
# echo "out" > /sys/class/gpio/gpio96/direction
Set GPIO value 0/1 if GPIO pin define is output
# echo 1 > /sys/class/gpio/gpio96/value
Used as IRQ signal
Note:You have to configure GPIO to input
# echo "rising" > /sys/class/gpio/gpio96/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 96 > /sys/class/gpio/unexport
Test
GPIO1 and GPIO2 are taken as an example:
- Connect GPIO1 and GPIO2
- Export GPIO1 and GPIO2
# echo 96 > /sys/class/gpio/export # echo 98 > /sys/class/gpio/export
- Set GPIO 1 to output
# echo "out" > /sys/class/gpio/gpio96/direction
- Set GPIO 2 to input
# echo "in" > /sys/class/gpio/gpio98/direction
- Change GPIO1 to 1 and read GPIO2value
# echo 1 > /sys/class/gpio/gpio96/value # cat /sys/class/gpio/gpio98/value 1
- Change GPIO1 to 0 and read GPIO2 value
# echo 0 > /sys/class/gpio/gpio96/value # cat /sys/class/gpio/gpio98/value 0