How to use GPIO for RK3399 RSB4710
From ESS-WIKI
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
RSB-4710
| GPIO Number | GPIO formed | Numeric Representation |
| GPIO1 |
GPIO2_B0 |
72 |
| GPIO2 |
GPIO1_C2 |
50 |
| |
|
|
| GPIO4 |
GPIO3_D4 |
124 |
| GPIO5 |
GPIO4_A4 |
132 |
| GPIO6 |
GPIO0_B0 |
8 |
Note：
GPIO3 is used to mute speak in later version.
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
|
RSB-3710
| GPIO Number | GPIO formed | Numeric Representation |
| GPIO1 |
EXP1_0 |
504 |
| GPIO2 |
EXP1_1 |
505 |
| GPIO3 |
EXP1_2 |
506 |
| GPIO4 |
EXP1_3 |
507 |
| GPIO5 |
EXP2_0 |
496 |
| GPIO6 |
EXP2_1 |
497 |
| GPIO7 |
EXP2_2 |
498 |
| GPIO8 |
EXP2_3 |
499 |
| GPIO9 |
EXP2_4 |
500 |
| GPIO10 |
EXP2_5 |
501 |
| GPIO11 |
EXP2_6 |
502 |
| GPIO12 |
EXP2_7 |
503 |
Note：
RSB-3710 uses two i2c GPIO expenders.
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