====== GPIO ======
[[..:bpi-r2:gpio|BPI-R2-GPIO]]
===== pin-define =====

{{http://wiki.banana-pi.org/images/1/1d/R64_gpio_40.jpg|}}


^ 2nd function ^ main function ^ pin# ^ xxxxxxxxxxxxxxxxxxxxx ^ pin# ^ main function  ^ 2nd function ^
|              |            |    | {{ :bpi-r2:gpio_farbig.png?nolink |}} |    |              |              |
| | +3V3 |   1  |  ::: |  2   | +5V |  |
| GPIO 56 # | I2C1_SDA |   3  |  ::: |  4   | +5V |  |
| GPIO 55 # | I2C1_SCL |   5  |  ::: |  6   | GND |  |
| GPIO101 | PWM 7 |   7  |  ::: |  8   | UART0-TX | GPIO 59 # |
| | GND |   9  |  ::: |  10  | UART0-RX | GPIO 60 # |
| GPIO 51 # | PWM1 / UART1-TX  |  11  |  ::: |  12  |  |  |
| GPIO 52 # | PWM2 / UART1-RX |  13  |  ::: |  14  | GND |  |
| GPIO 98 # | |  15  |  ::: |  16  |  | GPIO 61 # |
| | +3V3 |  17  |  ::: |  18  |  | GPIO 62 # |
| GPIO 68 # | PWM5 / SPI1 MOSI |  19  |  ::: |  20  | GND |  |
| GPIO 69 | PWM6 / SPI1 MISO |  21  |  ::: |  22  | SPI0 CLK | GPIO 63 |
| GPIO 67 | PWM4 / SPI1 CLK |  23  |  ::: |  24  | SPI1 CS | GPIO 70 |
| | GND |  25  |  ::: |  26  | SPI0 CS | GPIO 66 |
| GPIO 58 | I2C2 SDA |  27  |  ::: |  28  | I2C2 SCL | GPIO 57 |
| GPIO 85 | |  29  |  ::: |  30  | GND |  |
| GPIO 82 | SPI0 MOSI|  31  |  ::: |  32  | SPI0 MOSI | GPIO 64 |
| | |  33  |  ::: |  34  | GND |  |
| | |  35  |  ::: |  36  | SPI0 MISO | GPIO 65 |
| GPIO 86 | |  37  |  ::: |  38  | I2S IN |  |
| | GND |  39  |  ::: |  40  | I2S OUT |  |
| |   | ::: | | | |

(# verified gpio working, 101 is blocked by pwm)

  * uart0 (dts) => Debug-Uart
  * uart1 (dts) => undefined => mt7622_uart2_2_tx_rx_pins (59/60)
  * uart2 (dts) => uart1 (gpio) => mt7622_uart2_1_tx_rx_pins (51/52)


===== Kernel 4.19 =====

<code>
root@bpi-iot-ros-ai:~# cat /sys/kernel/debug/pinctrl/10211000.pinctrl-pinctrl_mt7622/gpio-ranges
GPIO ranges handled:
0: pinctrl_mt7622 GPIOS [409 - 511] PINS [0 - 102]
root@bpi-iot-ros-ai:~# GPIO_NO=$((409+56))
root@bpi-iot-ros-ai:~# echo $GPIO_NO
465
root@bpi-iot-ros-ai:~# echo $GPIO_NO > /sys/class/gpio/export

-bash: echo: write error: Invalid argument => blocked by i2c1

#if i2c1 is disabled in dts:
root@bpi-r64:~# echo $GPIO_NO > /sys/class/gpio/export                          
root@bpi-r64:~# echo out > /sys/class/gpio/gpio${GPIO_NO}/direction             
root@bpi-r64:~# echo 1 > /sys/class/gpio/gpio${GPIO_NO}/value #led goes on
root@bpi-r64:~# echo 0 > /sys/class/gpio/gpio${GPIO_NO}/value #led goes off
</code>

The sysfs interface (/sys/class/gpio/...) needs kernel-option CONFIG_GPIO_SYSFS

==== uart ====

debug-Uart is uart0 in DTS, uart2 seems to be uart1 of gpio header...uart1 is currently not defined in dts.

==== on-board LEDs ====

needs LEDS_GPIO [=y]

there is only red and green, red seems not working

    echo 1 > /sys/class/leds/bpi-r64\:pio\:green/brightness

===== pwm =====

in linux numbering begins at 0 where on bpi documentation/gpio-header pwms starting at 1...

    * pwm1 pin 11 (GPIO 51)
    * pwm2 pin 13 (GPIO 52)
    * pwm3 fan,inverted - seems not working correctly 
    * pwm4 pin 23 (GPIO 67)
    * pwm5 pin 19 (GPIO 68)
    * pwm6 pin 21 (GPIO 69)
    * pwm7 pin7 (GPIO101) - seems not working

pwm working except 3 (2) and 7 (6) in my [[https://github.com/frank-w/BPI-R2-4.14/commits/5.7-pwm|5.7-pwm branch]]

<code>
root@bpi-r64:~# cd /sys/class/pwm/pwmchip0
root@bpi-r64:/sys/class/pwm/pwmchip0# echo 0 > export
root@bpi-r64:/sys/class/pwm/pwmchip0# cd pwm0
root@bpi-r64:/sys/class/pwm/pwmchip0/pwm0# echo 10000 > period
root@bpi-r64:/sys/class/pwm/pwmchip0/pwm0# echo 5000 > duty_cycle
root@bpi-r64:/sys/class/pwm/pwmchip0/pwm0# echo 1 > enable
</code>
==== pwm in uboot ====

pwm-patches from sam are merged in 2020-07, but to use them there is cmd_pwm needed

http://forum.banana-pi.org/t/bpi-r64-current-u-boot-support/10077/74

both Available in [[https://github.com/frank-w/u-boot/commits/2020-04-bpi-pwm|2020-04-bpi-pwm branch]]

here pwm1 (0) is defined in dts