61-20210407华为海思Hi3516DV300的linux系统下控制GPIO口（标准linux模式点亮LED灯）
2021/4/7 15:13

https://xueqiu.com/7970718062/159110439
官井想开挖掘机
来自iPhone发布于2020-09-13 15:18
$润和软件(SZ300339)$

HiSpark AI Camera套件

l 支持鸿蒙OS、LiteOS、Linux系统，方便进行产品的原型验证和快速开发
l 板载海思Hi3516DV300芯片，内置双核Cortex-A7，最高运行评率900MHz，内置图像处理单元（ISP），内置H265/H264硬件编解码器，内置智能视频引擎（IVE），内置硬件安全引擎
l 主控芯片内置神经网络推理引擎（NNIE），8bit算力1Tops，可进行端侧AI计算
l 板载1G DDR3内存，最大传输速度1866Mbps
l 板载8G eMMC，最大传输速度
l 板载Hi3861 WiFi模组，支持IEEE 802.11 b/g/n，支持STA模式、AP模式
l 板载索尼IMX 335图像传感器，最大有效像素5.04M，视屏最高支持2592x1944@60fps

https://blog.csdn.net/cocoron/article/details/105704207
【海思篇】【Hi3516DV300】十三、添加GPIO管理接口和手动实现一个GPIO调试工具

通过/sys/class/gpio配置
#比如配置gpio0_4为输出，拉高
echo 4 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio4/direction
echo 1 > /sys/class/gpio/gpio4/value
echo 4 > /sys/class/gpio/unexport
（也就是GPIO口的编号是从0开始！）

1、找到开发板上的LED灯的GPIO号：
http://www.hihope.org/
江苏润和软件股份有限公司
http://www.hihope.org/download/download.aspx?mtt=12
HiSpark AI Camera 原理图.zip
HiSpark_AI_Hi3516D_Core_VER.B_NoValueSCH_0929.pdf

在WPS中搜索LED，很容易找到第12页的2个LED灯：
LED_light/GPIO2_3 绿色LED灯
Led_core/GPIO3_4  红色LED灯

根据经验，很容易知道每一组GPIO口有8个。
也就第0组的GPIO口是从GPIO0_0到GPIO0_7！

GPIO3_4的编号：3*8+4=28

GPIO2_3的编号：2*8+3=19

2、配置命令：
clk: Not disabling unused clocks
Waiting for root device /dev/mmcblk0p3...
mmc0: new HS200 MMC card at address 0001
mmc0: -524: cmdq: unable to set-up
mmcblk0: mmc0:0001 8GTF4R 7.28 GiB 
mmcblk0boot0: mmc0:0001 8GTF4R partition 1 4.00 MiB
mmcblk0boot1: mmc0:0001 8GTF4R partition 2 4.00 MiB
mmcblk0rpmb: mmc0:0001 8GTF4R partition 3 512 KiB
 mmcblk0: p1(uboot.bin) p2(kernel) p3(rootfs.ext4) p4(user)
EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) on device 179:3.
devtmpfs: mounted
Freeing unused kernel memory: 1024K (c0800000 - c0900000)

_ _ _ _ _ _ _ _ _ _ _ _
            \  _  _   _  _ _ ___
            / /__/ \ |_/
           / __   /  -  _ ___
          / /  / /  / /
  _ _ _ _/ /  /  \_/  \_ ______
___________\___\__________________

[RCS]: /etc/init.d/S00devs
mknod: /dev/console: File exists
mknod: /dev/ttyAMA0: File exists
mknod: /dev/null: File exists
[RCS]: /etc/init.d/S01udev
random: udevd: uninitialized urandom read (16 bytes read)
udevd[89]: starting eudev-3.2.7
[RCS]: /etc/init.d/S80network
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
Auto login as root ...
login[108]: root login on 'ttyS000'
Welcome to HiLinux.
None of nfsroot found in cmdline.
~ # hisi-femac 10010000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

~ # 
~ # 
~ # 
~ # random: fast init done
random: crng init done

~ # 
~ # 
~ # ls -l
total 0
~ # 
~ # pwd
/root
~ # 
~ # 
~ # cd /
/ # 
/ # pwd
/
/ # 
/ # 
/ # cd /sys
/sys # ls -l
total 0
drwxr-xr-x    2 root     root             0 Jan  1 06:00 block
drwxr-xr-x   19 root     root             0 Jan  1 04:12 bus
drwxr-xr-x   27 root     root             0 Jan  1 04:12 class
drwxr-xr-x    4 root     root             0 Jan  1 06:00 dev
drwxr-xr-x    5 root     root             0 Jan  1 04:12 devices
drwxr-xr-x    3 root     root             0 Jan  1 06:00 firmware
drwxr-xr-x    5 root     root             0 Jan  1 06:00 fs
drwxr-xr-x    7 root     root             0 Jan  1 06:00 kernel
drwxr-xr-x   44 root     root             0 Jan  1 06:00 module
drwxr-xr-x    2 root     root             0 Jan  1 06:00 power
/sys # 
/sys # 
/sys # cd class/
/sys/class # 
/sys/class # ls -l
total 0
drwxr-xr-x    2 root     root             0 Jan  1 04:12 bdi
drwxr-xr-x    2 root     root             0 Jan  1 04:12 block
drwxr-xr-x    2 root     root             0 Jan  1 04:12 bsg
drwxr-xr-x    2 root     root             0 Jan  1 04:12 gpio
drwxr-xr-x    2 root     root             0 Jan  1 04:12 graphics
drwxr-xr-x    2 root     root             0 Jan  1 04:12 i2c-dev
drwxr-xr-x    2 root     root             0 Jan  1 04:12 input
drwxr-xr-x    2 root     root             0 Jan  1 04:12 mdio_bus
drwxr-xr-x    2 root     root             0 Jan  1 04:12 mem
drwxr-xr-x    2 root     root             0 Jan  1 04:12 misc
drwxr-xr-x    2 root     root             0 Jan  1 04:12 mmc_host
drwxr-xr-x    2 root     root             0 Jan  1 04:12 net
drwxr-xr-x    2 root     root             0 Jan  1 04:12 phy
drwxr-xr-x    2 root     root             0 Jan  1 04:12 power_supply
drwxr-xr-x    2 root     root             0 Jan  1 04:12 rtc
drwxr-xr-x    2 root     root             0 Jan  1 04:12 scsi_device
drwxr-xr-x    2 root     root             0 Jan  1 04:12 scsi_disk
drwxr-xr-x    2 root     root             0 Jan  1 04:12 scsi_host
drwxr-xr-x    2 root     root             0 Jan  1 04:12 spi_master
drwxr-xr-x    2 root     root             0 Jan  1 04:12 spidev
drwxr-xr-x    2 root     root             0 Jan  1 04:12 tty
drwxr-xr-x    2 root     root             0 Jan  1 04:12 udc
drwxr-xr-x    2 root     root             0 Jan  1 04:12 vc
drwxr-xr-x    2 root     root             0 Jan  1 04:12 video4linux
drwxr-xr-x    2 root     root             0 Jan  1 04:12 vtconsole
/sys/class # 
/sys/class # 
/sys/class # cd gpio/
/sys/class/gpio # 
/sys/class/gpio # ls -l
total 0
--w-------    1 root     root          4096 Jan  1 04:12 export
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip0 -> ../../devices/platform/soc/120d0000.gpio_chip/gpio/gpiochip0
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip16 -> ../../devices/platform/soc/120d2000.gpio_chip/gpio/gpiochip16
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip24 -> ../../devices/platform/soc/120d3000.gpio_chip/gpio/gpiochip24
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip32 -> ../../devices/platform/soc/120d4000.gpio_chip/gpio/gpiochip32
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip40 -> ../../devices/platform/soc/120d5000.gpio_chip/gpio/gpiochip40
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip48 -> ../../devices/platform/soc/120d6000.gpio_chip/gpio/gpiochip48
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip56 -> ../../devices/platform/soc/120d7000.gpio_chip/gpio/gpiochip56
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip64 -> ../../devices/platform/soc/120d8000.gpio_chip/gpio/gpiochip64
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip72 -> ../../devices/platform/soc/120d9000.gpio_chip/gpio/gpiochip72
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip8 -> ../../devices/platform/soc/120d1000.gpio_chip/gpio/gpiochip8
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip80 -> ../../devices/platform/soc/120da000.gpio_chip/gpio/gpiochip80
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip88 -> ../../devices/platform/soc/120db000.gpio_chip/gpio/gpiochip88
--w-------    1 root     root          4096 Jan  1 04:12 unexport
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # echo 28 > export 
/sys/class/gpio # 
/sys/class/gpio # ls -l
total 0
--w-------    1 root     root          4096 Jan  1 06:00 export
lrwxrwxrwx    1 root     root             0 Jan  1 06:00 gpio28 -> ../../devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip0 -> ../../devices/platform/soc/120d0000.gpio_chip/gpio/gpiochip0
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip16 -> ../../devices/platform/soc/120d2000.gpio_chip/gpio/gpiochip16
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip24 -> ../../devices/platform/soc/120d3000.gpio_chip/gpio/gpiochip24
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip32 -> ../../devices/platform/soc/120d4000.gpio_chip/gpio/gpiochip32
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip40 -> ../../devices/platform/soc/120d5000.gpio_chip/gpio/gpiochip40
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip48 -> ../../devices/platform/soc/120d6000.gpio_chip/gpio/gpiochip48
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip56 -> ../../devices/platform/soc/120d7000.gpio_chip/gpio/gpiochip56
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip64 -> ../../devices/platform/soc/120d8000.gpio_chip/gpio/gpiochip64
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip72 -> ../../devices/platform/soc/120d9000.gpio_chip/gpio/gpiochip72
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip8 -> ../../devices/platform/soc/120d1000.gpio_chip/gpio/gpiochip8
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip80 -> ../../devices/platform/soc/120da000.gpio_chip/gpio/gpiochip80
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip88 -> ../../devices/platform/soc/120db000.gpio_chip/gpio/gpiochip88
--w-------    1 root     root          4096 Jan  1 04:12 unexport
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # cd gpio28/
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # ls -l
total 0
-rw-r--r--    1 root     root          4096 Jan  1 06:00 active_low
lrwxrwxrwx    1 root     root             0 Jan  1 06:00 device -> ../../../gpiochip3
-rw-r--r--    1 root     root          4096 Jan  1 06:00 direction
-rw-r--r--    1 root     root          4096 Jan  1 06:00 edge
drwxr-xr-x    2 root     root             0 Jan  1 06:00 power
lrwxrwxrwx    1 root     root             0 Jan  1 06:00 subsystem -> ../../../../../../../class/gpio
-rw-r--r--    1 root     root          4096 Jan  1 06:00 uevent
-rw-r--r--    1 root     root          4096 Jan  1 06:00 value
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cat directi
on 
in
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo out > 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo out > 
direction 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cat directi
on 
out
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cat value 
0
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo 1 > va
lue
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo 0 > va
lue
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 #

/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cd /sys/cla
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cd /sys/cla
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # cd /sys/cla
ss/gpio/
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # ls -l
total 0
--w-------    1 root     root          4096 Jan  1 06:00 export
lrwxrwxrwx    1 root     root             0 Jan  1 06:00 gpio28 -> ../../devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip0 -> ../../devices/platform/soc/120d0000.gpio_chip/gpio/gpiochip0
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip16 -> ../../devices/platform/soc/120d2000.gpio_chip/gpio/gpiochip16
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip24 -> ../../devices/platform/soc/120d3000.gpio_chip/gpio/gpiochip24
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip32 -> ../../devices/platform/soc/120d4000.gpio_chip/gpio/gpiochip32
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip40 -> ../../devices/platform/soc/120d5000.gpio_chip/gpio/gpiochip40
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip48 -> ../../devices/platform/soc/120d6000.gpio_chip/gpio/gpiochip48
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip56 -> ../../devices/platform/soc/120d7000.gpio_chip/gpio/gpiochip56
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip64 -> ../../devices/platform/soc/120d8000.gpio_chip/gpio/gpiochip64
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip72 -> ../../devices/platform/soc/120d9000.gpio_chip/gpio/gpiochip72
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip8 -> ../../devices/platform/soc/120d1000.gpio_chip/gpio/gpiochip8
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip80 -> ../../devices/platform/soc/120da000.gpio_chip/gpio/gpiochip80
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip88 -> ../../devices/platform/soc/120db000.gpio_chip/gpio/gpiochip88
--w-------    1 root     root          4096 Jan  1 04:12 unexport
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # echo 19 > export 
/sys/class/gpio # 
/sys/class/gpio # ls -l
total 0
--w-------    1 root     root          4096 Jan  1 06:04 export
lrwxrwxrwx    1 root     root             0 Jan  1 06:04 gpio19 -> ../../devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19
lrwxrwxrwx    1 root     root             0 Jan  1 06:00 gpio28 -> ../../devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip0 -> ../../devices/platform/soc/120d0000.gpio_chip/gpio/gpiochip0
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip16 -> ../../devices/platform/soc/120d2000.gpio_chip/gpio/gpiochip16
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip24 -> ../../devices/platform/soc/120d3000.gpio_chip/gpio/gpiochip24
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip32 -> ../../devices/platform/soc/120d4000.gpio_chip/gpio/gpiochip32
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip40 -> ../../devices/platform/soc/120d5000.gpio_chip/gpio/gpiochip40
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip48 -> ../../devices/platform/soc/120d6000.gpio_chip/gpio/gpiochip48
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip56 -> ../../devices/platform/soc/120d7000.gpio_chip/gpio/gpiochip56
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip64 -> ../../devices/platform/soc/120d8000.gpio_chip/gpio/gpiochip64
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip72 -> ../../devices/platform/soc/120d9000.gpio_chip/gpio/gpiochip72
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip8 -> ../../devices/platform/soc/120d1000.gpio_chip/gpio/gpiochip8
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip80 -> ../../devices/platform/soc/120da000.gpio_chip/gpio/gpiochip80
lrwxrwxrwx    1 root     root             0 Jan  1 04:12 gpiochip88 -> ../../devices/platform/soc/120db000.gpio_chip/gpio/gpiochip88
--w-------    1 root     root          4096 Jan  1 04:12 unexport
/sys/class/gpio # 
/sys/class/gpio # 
/sys/class/gpio # cd gpio19/
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # ls -l
total 0
-rw-r--r--    1 root     root          4096 Jan  1 06:04 active_low
lrwxrwxrwx    1 root     root             0 Jan  1 06:04 device -> ../../../gpiochip2
-rw-r--r--    1 root     root          4096 Jan  1 06:04 direction
-rw-r--r--    1 root     root          4096 Jan  1 06:04 edge
drwxr-xr-x    2 root     root             0 Jan  1 06:04 power
lrwxrwxrwx    1 root     root             0 Jan  1 06:04 subsystem -> ../../../../../../../class/gpio
-rw-r--r--    1 root     root          4096 Jan  1 06:04 uevent
-rw-r--r--    1 root     root          4096 Jan  1 06:04 value
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cat directi
on 
in
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # echo out > 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # echo out > 
direction 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cat directi
on 
out
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cat value 
0
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # echo 1 > va
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # echo 1 > va
lue 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # 
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cd ../gpio1
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cd /sys/cla
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cd /sys/cla
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cd /sys/cla
/sys/devices/platform/soc/120d2000.gpio_chip/gpiochip2/gpio/gpio19 # cd /sys/cla
ss/gpio/gpio28/
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo 1 > va
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # echo 1 > va
lue 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 # 
/sys/devices/platform/soc/120d3000.gpio_chip/gpiochip3/gpio/gpio28 #

参考资料：
（linux系统）
https://blog.csdn.net/qq_29858649/article/details/115346735
HI3516DV300 GPIO操作

https://blog.csdn.net/u012478275/article/details/94125742
海思芯片上GPIO操作

（鸿蒙系统）
https://bbs.elecfans.com/jishu_1990090_1_1.html
[讨论] 手把手教你如何烧录Hi3516DV300鸿蒙开发板（HiSpark AI Camera）！

https://bbs.elecfans.com/jishu_1998420_1_1.html
[文章] 【HarmonyOS HiSpark AI Camera试用连载 】终于把灯点亮了

https://bbs.elecfans.com/jishu_2012800_1_1.html
[资料] Harmony应用编程之GPIO编程踩坑小记

https://harmonyos.51cto.com/posts/2752
#2020征文-开发板#【Hi3516DV300试用 】GPIO编程踩坑小记

https://bbs.elecfans.com/jishu_1996485_1_1.html
[经验] 【HarmonyOS HiSpark Wi-Fi IoT 套件】第四篇：驱动LED灯

https://bbs.elecfans.com/jishu_2004129_1_1.html
[经验] 【HarmonyOS HiSpark Wi-Fi IoT套件】鸿蒙HiSpark Wi-Fi IoT开发套件试用04（点亮LED灯）

https://bbs.elecfans.com/jishu_2007024_1_1.html
[经验] 【HarmonyOS HiSpark Wi-Fi IoT 套件】LED灯闪烁

https://bbs.elecfans.com/jishu_2007043_1_1.html
[讨论] 【HarmonyOS HiSpark Wi-Fi IoT 套件】GPIO操作体验

https://bbs.elecfans.com/jishu_1998959_1_1.html
[经验] 【HarmonyOS HiSpark Wi-Fi IoT 套件】3-编写简单GPIO程序

https://zhuanlan.zhihu.com/p/257938114
在Linux环境下,Hi3516DV300开发板搭载鸿蒙OS实现一个简单的Helloworld程序

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