Jetson nano with emmc. how can i use 40 gpio by c++

[xinzhenren]

i use Nano module with emmc whitch is not supported by jetson-io.py to configurate 40 pins gGPIO.how can i use GPIO by c++. I use GPIO to control LED and Matrix keyboard.
I would have implemented a similar process with the official B01, using an SD card at the time.
Specific information is as follows：
BOARD编码模式
LED：15 16 18 19 21 22 23 24 26 38 40
Matrix keyboard.：7 11 12 13 29 33 35 37

[JerryChang]

hello xinzhenren,

please examine the gpio number and controlling it through driver side.
you may access GPIOs via “gpio” device labels, /sys/kernel/debug/gpio. or, you may also use the gpiofind utility for checking the gpio number,
for example,

# gpiofind SPI0_CS0
gpiochip0 19