HummingBoard Edge/Gate/CBi GPIO Pins Control

To control on the GPIO pins:

• The external GPIOs are available under the /sys/class/gpio folder in Linux.

• To control on the GPIO pins you need to calculate the GPIO number XX (*) and run the commands below:

# Export GPIO XX
echo XX > /sys/class/gpio/export

# Set GPIO pin Direction
echo "out" > /sys/class/gpio/gpioXX/direction
or
echo "in" > /sys/class/gpio/gpioXX/direction

# Set the value of an output pin
echo 1 > /sys/class/gpio/gpioXX/value
or
echo 0 > /sys/class/gpio/gpioXX/value

# Get the value of an input pin
cat /sys/class/gpio/gpioXX/value

# Unexport GPIO XX
echo XX > /sys/class/gpio/unexport

You can calculate the GPIO number XX: XX = linux gpio number = (gpio_bank - 1) * 32 + gpio_bit

Example: to calculate the GPIO number of pin header J1 [pin 3]

Pad Name : DISP1_DATA0

GPIO Bank = 3

GPIO bit = 9

XX = linux gpio number = (3 - 1)*32 + 9 = 73

Attached here the headers schematics

36 pin header implemented using 4 headers

Header Pin	Pad Name	GPIO name	Linux GPIO number
J21 [pin 1]	3.2V
J21 [pin 2]	5V
J21 [pin 3]	DISP1_DATA00	GPIO3_IO09	73
J21 [pin 4]	DISP1_DATA01	GPIO3_IO08	72
J21 [pin 5]	DISP1_DATA04	GPIO3_IO05	69
J21 [pin 6]	DISP1_DATA05	GPIO3_IO04	68
J23 [pin 1]	DI1_D0_CS	GPIO3_IO13	77
J23 [pin 2]	DI1_D1_CS	GPIO3_IO14	78
J23 [pin 3]	DISP1_DAT08	GPIO3_IO01	65
J23 [pin 4]	DISP1_DAT09	GPIO3_IO00	64
J23 [pin 5]	DISP1_DAT12	GPIO2_IO21	53
J23 [pin 6]	DISP1_DAT13	GPIO2_IO20	52
J23 [pin 7]	DISP1_DAT16	GPIO2_IO17	49
J23 [pin 8]	DISP1_DAT17	GPIO2_IO16	48
J23 [pin 9]	DISP1_DAT20	GPIO3_IO31	95
J23 [pin 10]	DISP1_DAT21	GPIO3_IO30	94
J23 [pin 11]	GND
J23 [pin 12]	DI1_DISP_CLK	GPIO2_IO22	54
J22 [pin 1]	DI1_PIN15	GPIO3_IO10	74
J22 [pin 2]	DISP1_DATA03	GPIO3_IO11	75
J22 [pin 3]	DISP1_DATA02	GPIO3_IO07	71
J22 [pin 4]	DISP1_DATA03	GPIO3_IO06	70
J22 [pin 5]	DISP1_DATA06	GPIO3_IO03	67
J22 [pin 6]	DISP1_DATA07	GPIO3_IO02	66
J24 [pin 1]	DI1_PIN01	GPIO3_IO15	79
J24 [pin 2]	DI1_PIN03	GPIO3_IO12	76
J24 [pin 3]	DISP1_DATA10	GPIO2_IO29	61
J24 [pin 4]	DISP1_DATA11	GPIO2_IO28	60
J24 [pin 5]	DISP1_DATA14	GPIO2_IO19	51
J24 [pin 6]	DISP1_DATA15	GPIO2_IO18	50
J24 [pin 7]	DISP1_DATA18	GPIO6_IO06	166
J24 [pin 8]	DISP1_DATA19	GPIO5_IO04	132
J24 [pin 9]	DISP1_DATA22	GPIO3_IO26	90
J24 [pin 10]	DISP1_DATA23	GPIO3_IO27	91
J24 [pin 11]	SPDIF_IN	GPIO1_IO24	24
J24 [pin 12]	SPDIF_OUT	GPIO7_IO12	204