Difference between revisions of "How to use GPIO for RK3399 RSB4710"
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gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31 | gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31 | ||
| − | E.g. | + | E.g. GPIO2_B0 becomes 72 |
RSB-4710 | RSB-4710 | ||
| Line 18: | Line 18: | ||
| GPIO formed | | GPIO formed | ||
| Numeric Representation | | Numeric Representation | ||
| − | |||
| − | |||
| − | |||
| − | |||
|- | |- | ||
| GPIO1<br/> | | GPIO1<br/> | ||
| − | | | + | | GPIO2_B0<br/> |
| − | | | + | | 72 |
|- | |- | ||
| GPIO2<br/> | | GPIO2<br/> | ||
| − | | | + | | GPIO1_C1<br/> |
| − | | | + | | 50<br/> |
|- | |- | ||
| GPIO3<br/> | | GPIO3<br/> | ||
| − | | | + | | GPIO4_A3<br/> |
| − | | | + | | 131 |
|- | |- | ||
| GPIO4<br/> | | GPIO4<br/> | ||
| − | | | + | | GPIO3_D4<br/> |
| − | | | + | | 124 |
|- | |- | ||
| GPIO5<br/> | | GPIO5<br/> | ||
| − | | | + | | GPIO4_A4<br/> |
| − | | | + | | 132 |
|- | |- | ||
| GPIO6<br/> | | GPIO6<br/> | ||
| − | | | + | | GPIO0_B0<br/> |
| − | | | + | | 8 |
| − | |||
| − | |||
| − | |||
| − | |||
|} | |} | ||
Revision as of 01:48, 7 May 2020
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_C1 |
50 |
| GPIO3 |
GPIO4_A3 |
131 |
| GPIO4 |
GPIO3_D4 |
124 |
| GPIO5 |
GPIO4_A4 |
132 |
| GPIO6 |
GPIO0_B0 |
8 |
Test
Export GPIO then you can use control GPIO from userr space through sysfs
Export GPIO0
# echo 219 > /sys/class/gpio/export
Set GPIO direction to in/out
# echo "out" > /sys/class/gpio/gpio219/direction
Set GPIO value 0/1 if GPIO pin define is output
# echo 1 > /sys/class/gpio/gpio219/value
Used as IRQ signal
Note:You have to configure GPIO to input
# echo "rising" > /sys/class/gpio/gpio219/edge
- rising: Trigger on rising edge
- falling: Trigger on falling edge
- both: Trigger on both edges
- none: Disable interrupt on both edges
Unexport GPIO0
# echo 219 > /sys/class/gpio/unexport
Test
GPIO 219 and GPIO 220 are taken as an example:
- Connect GPIO 219 and GPIO 220
- Export GPIO 219 and GPIO 220
# echo 219 > /sys/class/gpio/export # echo 220 > /sys/class/gpio/export
- Set GPIO 219 to output
# echo "out" > /sys/class/gpio/gpio219/direction
- Set GPIO 220 to input
# echo "in" > /sys/class/gpio/gpio220/direction
- Change GPIO 219 to 1 and read GPIO 220 value
# echo 1 > /sys/class/gpio/gpio219/value # cat /sys/class/gpio/gpio220/value 1
- Change GPIO 219 to 0 and read GPIO 220 value
# echo 0 > /sys/class/gpio/gpio219/value # cat /sys/class/gpio/gpio220/value 0