====== GPIO ======

{{ :en:bpi-r2pro:r2pro_gpio.png?nolink |}}

^ Sparefunction ^ Mainfunction ^ pin# ^ xxxxxxxxxxxxxxxxxxxxx ^ pin# ^ Mainfunction  ^ Sparefunction ^
|              |            |    | {{ :en:bpi-r2pro:gpio_farbig_r2pro.png?nolink |}} |    |              |              |
| -             | 3V3           |   1  |  ::: |  2   | 5V             | -             |
| I2C5_SDA M0   | GPIO3 B4 (12)   |   3  |  ::: |  4   | 5V             | -             |
| I2C5 SCL M0   | GPIO3 B3 (11) |   5  |  ::: |  6   | GND            | -             |
| PWM10         | GPIO3 B5 (13) |   7  |  ::: |  8   | GPIO0 C1 (17)  | UART0 TX      |
| -             | GND           |   9  |  ::: |  10  | GPIO0 C0 (16)  | UART0 RX      |
| UART7 TX      | GPIO3 C4 (20) |  11  |  ::: |  12  | GPIO4 D2 (26)  |               |
| UART7 RX      | GPIO3 C5 (21) |  13  |  ::: |  14  | GND            | -             |
| PWM11         | GPIO3 B6 (14) |  15  |  ::: |  16  | GPIO0 C4 (20)  | UART0 RTS     |
| -             | 3V3           |  17  |  ::: |  18  | GPIO0 C7 (23)  | UART0 CTS     |
| SPI3_MO, PWM15 | GPIO4 C3 (19) |  19  |  ::: |  20  | GND           | -             |
| SPI3_MI, PWM12, UART9 TX | GPIO4 C5 (21)  |  21  |  ::: |  22  | GPIO4 C4 (20)  | SPDIF TX  |
| SPI3_CK, PWM14  | GPIO4 C2 (18) |  23  |  ::: |  24  | GPIO4 C6 (22)  | PWM13, UART9 RX |
| -             | GND           |  25  |  ::: |  26  | GPIO3 C3 (19)  |               |
|               | GPIO1 A4 (4)  |  27  |  ::: |  28  | GPIO3 C1 (17)  |               |
|               | GPIO1 B0 (8)  |  29  |  ::: |  30  | GND            | -             |
|               | GPIO1 B1 (9)  |  31  |  ::: |  32  | GPIO3 A7 (7)   |               |
|               | GPIO1 B2 (10) |  33  |  ::: |  34  | GND            | -             |
|               | GPIO0 A0 (0)  |  35  |  ::: |  36  | GPIO3 A2 (2)   |               |
|               | GPIO2 D6 (30) |  37  |  ::: |  38  | GPIO0 A6 (6)   |               |
| -             | GND           |  39  |  ::: |  40  | GPIO0 B7 (15)  |               |
| | |   | ::: | | | |


There are four gpio controllers (gpio0-3) with four banks (A-D) of 8 gpios each (0-7).

https://elixir.bootlin.com/linux/latest/source/include/dt-bindings/pinctrl/rockchip.h

PWM 10-15 / UART 0+7+9 / I2C5 / SPI3 have to be enabled in dts
===== gpiolib =====

https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/

  apt install gpiod

Gpioset only sets gpio while running, so run with wait and press ctrl+z to stop process (running bg will end it and reset gpio)

This will set gpio 6 on first controller (0):

  # gpioset -m wait 0 6=1
  ^Z[1]+  Stopped

===== pwm =====

[[..:bpi-r2:gpio#pwm|PWM (bpi-r2)]]

each pwm enabled gets its own pwmchip-node where it can be enabled with "echo 0"

if the pwms of fan (8) and all on gpio header enabled (10-15) we get /sys/class/pwm/pwmchip0 - 6

example for pwm10 (pin 7) with 1 Hz blinking (values for period and duty_cycle in ns)

  # echo 0 > /sys/class/pwm/pwmchip1/export
  # echo 1000000000 > /sys/class/pwm/pwmchip1/pwm0/period
  # echo 500000000 > /sys/class/pwm/pwmchip1/pwm0/duty_cycle
  # echo 1 > /sys/class/pwm/pwmchip1/pwm0/enable

===== thermal =====

  root@bpi-r2pro:~# cat /sys/class/thermal/thermal_zone0/type
  cpu-thermal
  root@bpi-r2pro:~# cat /sys/class/thermal/thermal_zone0/temp
  43125
  root@bpi-r2pro:~# cat /sys/class/thermal/thermal_zone1/type
  gpu-thermal
  root@bpi-r2pro:~# cat /sys/class/thermal/thermal_zone1/temp
  43750
===== saradc =====

  cat /sys/devices/platform/fe720000.saradc/iio:device0/in_voltage2_raw