Orange Pi 4G- IoT

Orange Pi Introduction

What is Orange Pi 4G-IoT?

It’s an open-source single-board computer. It can run Android 6.0 Image. It uses the MTK serial MT6737 SoC, and has 1GB DDR3 SDRAM.

What can I do with Orange Pi 4G-IoT?

You can use it to build...

• A computer
• A wireless server
• Games
• Music and Sounds
• HD video
• A speaker
• Android
• Scratch

Pretty much anything else, because Orange Pi 4G-IoT is open source.

Who is it for?

Orange Pi 4G-IoT is for anyone who wants to start creating with technology – not just consuming it. It's a simple, fun, useful tool that you can use to start taking control of the world around you.

Orange Pi 4G-IoT Hardware Specification

Orange Pi 4G-IoT Specification
Processor	MT6737
CPU	Quad core ARM® Cortex-A53, Main frequency up to 1.25GHz
GPU	ARM Mali-T720 MP1
Memory	1GB DDR3
Emmc	8GB EMMC Flash
Wireless	WIFI / BT / FM / GPS Four in one
Radio frequency GSM WCDMA TD-CDMA CDMA2000 FDD-LTE TDD-LTE	900/1800 (850/1900 optional)
	B1/B8 (B2/B4/B5 optional)
	/
	/
	B1/B3/B7/B20 (B2/B4/B17optional)
	B38/40/41B
Display	HD
Capacitance touch	Support
Camera	13M （25pin ZIF Connector）
Accelerometer Sensor	Support
IR Control	Support (Adapted iDroid remote controller)
Fingerprint Identification	Support
SIM Card	mini Single SIM Card
TF Card	Support hot-plugging
Audio Earphone Mic	For audio input / output
	For audio input
USB USB Host × 3 Micro USB × 1	Support OTG
	Only for writing image
LED Power Indicator LED Status Indicator LED	Red
	Green
Key	Power
HDMI	Support
Low-level peripherals 40pin Headers	1.8V, SPI × 2 , I2C × 3, UART × 2
Power DC Battery	5V 2A
	Connection through a weld plate
OS/Software
OS	Android 6.0
Programming support	C、C++、Kotlin、Java、Shell、Python
Interface definition
Size	55mm*85mm
Weight	43g
Orange Pi™ is trademark of Shenzhen Xunlong Software CO., Limited

Orange Pi 4G-IoT 40pins GPIO Specification

OrangePi(4G-IoT)
P01	VIO28_PMU
P02	DC5V
P03	SDA1	GPIO49
P04	DC5V
P05	SCL1	GPIO50
P06	GND
P07	EINT87	GPIO87
P08	UTXD2
P09	GND
P10	URXD2	GPIO57
P11	URXD1
P12	EINT8	EINT8
P13	UTXD1
P14	GND
P15	UCTS1
P16	EINT9	EINT9
P17	VIO28_PMU
P18	EINT11	EINT11
P19	SPI2_MI	EINT3
P20	GND
P21	SPI2_MO	EINT4
P22	URTS1
P23	SPI2_CK	EINT6
P24	SPI2_CS	EINT5
P25	GND
P26	EINT12
P27	SDA2	GPIO51
P28	SCL2	GPIO52
P29	SPI_CS	GPIO65
P30	GND
P31	SPI_CK	GPIO66
P32	URTS2	GPIO60
P33	SPI_MO	PA9
P34	GND
P35	SPI_MI	GPIO67
P36	UCTS2	GPIO59
P37	EINT_123	GPIO123
P38	SCL3	GPIO54
P39	GND
P40	SDA3	GPIO53

Interface instructions:

Using Method

Prepare the Hardware and Software

Hardware Requirement:

• Orange Pi 4G-IoT Development Board
• A PC for compilation with following specs:

64bit CPU
Up to 16GB RAM
UP to 40GB spare disk space
Operation system should up to Ubuntu12.04, it would be better if it is Ubuntu16.04
You could refer to Google file for more details: https://source.android.com/source/building

Software Requirement:

• Orange Pi 4G-IoT SDK
• Orange Pi 4G-IoT Firmware
• Android-image-flash-tool

Power Methods

There are two methods for power supply:

• DC （5V 2A）in for power:
• Battery in for power:

Usually use 3.7V battery to solder on the back side of the development board.

Before Usage

After receiving the product, please put the antennas of the product from the position of Pic 1 to the position of Pic 2 (or to the outside of the board), which can not be attached to the board so as not to affect the signal.

Pic 1

Pic 2

Android Compilation Environment Construction

Download SDK compression package

• Android 6.0

Download the compression packages, corresponding to OrangePi_4G-IoT_Android 6.0_V1.0.tar.gz.00, OrangePi_4G-IoT_Android 6.0_V1.0.tar.gz.01, OrangePi_4G-IoT_Android 6.0_V1.0.tar.gz.14, a total of 15 volume compression packages. After obtaining the volume compressed packages, place all the compressed packages in the same directory, such as

Create directory:
mkdir OrangePi_4G-IoT_Android6.0
Copy Volume Compression Packet:
cp -rf OrangePi_4G-IoT_Android6.0_V1.0.tar.gz.*
OrangePi_4G-IoT_Android6.0/
Merge Compression Packet:
cat OrangePi_4G-IoT_Android6.0_V1.0.tar.gz.* >
OrangePi_4G-IoT_Android6.0.tar.gz
Unzip:
tar xzvf OrangePi_4G-IoT_Android6.0.tar.gz

• Android 8.1

After downloaded compression package, you will have 11packages named x00, x01, x02, x03 ...x10.Put packages on the same directory like the following:

Create directory
mkdir OrangePi_4G-IoT_Android8.1
Copy compress package
cp -rf x00 x01 x02 ... x10
Merge compression package
cat x*>OrangePi_4G-IoT_Android8.1.tar.gz
Decompression
tar xzvf OrangePi_4G-IoT_Android8.tar.gz

Construct Compilation Environment

It could also refer to Google file: [http://source.android.com/source/initializing.html

http://source.android.com/source/initializing.html]

• Install JDK

Compilation of Android6.0 is based on JAVA7, it needs to first install OpenJDK before compilation.

Command for installing:

sudo apt-get install openjdk-7-jdk

Configure environment variable of JAVA, here is the path for installation:

/usr/lib/jvm/java-7-openjdk-amd64

It could configure on the terminal with the following command:

export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar

• Install Software Package

For Ubuntu12.04:

sudo apt-get update
sudo apt-get install git-core gnupg flex bison ccache gperf libsdl1.2-dev libesd0-dev libwxgtk2.6-dev build-essential zip curl libncurses5-dev zlib1g-dev valgrind libc6-dev lib32ncurses5-dev x11proto-core-dev libx11-dev lib32readline-gplv2-dev lib32z1-dev libgl1-mesa-dev gcc-4.4 g++-4.4 g++-4.4-multilib g++-multilib mingw32 tofrodos python-markdown libxml2-utils xsltproc wine

For Ubuntu14.04：

sudo apt-get update
sudo apt-get install git-core gnupg flex bison ccache gperf libsdl1.2-dev libesd0-dev libwxgtk2.8-dev build-essential zip curl libncurses5-dev zlib1g-dev valgrind libc6-dev lib32ncurses5-dev x11proto-core-dev libx11-dev lib32readline-gplv2-dev lib32z1-dev libgl1-mesa-dev g++-multilib g++-4.8-multilib mingw32 tofrodos python-markdown libxml2-utils xsltproc libc6-dev-i386 lib32z1 lib32ncurses5 lib32bz2-1.0 lib32readline-gplv2-dev wine

We could process to SDK compilation after finished the above.

Compilation of SDK Source Code

There are many compilation shell scripts for development.

• Android 6.0

The directory would be: SDK/code/orangepi/scripts

$ cd code/orangepi/scripts
$ ls
anr_LM.sh auto.sh clean.sh codegen.sh init_project.sh tar_img.sh

auto.sh is automatically compilation script
clean.sh automatically scavenging the compiled result script

On the directory of code/orangepi/scripts, execute the automatically compilation script:

$ ./auto.sh IoT_bd6737m_35g_b_m0_op_smt_hd720_pcb_v2 v00 eng

The meaning of the parameter is:

1. $1 project_info [eg: IoT_bd6737m_35g_b_m0_op_smt_hd720_pcb_v2]
   
2. $2 version_info [eg: v00 v01 ...]
   
3. $3 compile_mode [eng:user userdebug eng]

• Android 8.1

The directory would be: SDK/code/orangepi/scripts

$ cd code/orangepi/scripts
$ ls
anr_LM.sh auto.sh clean.sh codegen.sh init_project.sh tar_img.sh

auto.sh--scripts for automatic compilation
clean.sh--scripts for automatically cleaning the compiled result

On the directory of code/orangepi/scripts, execute automatic compilation scripts:

$ ./auto.sh IoT_k37mv1_bsp_ry_smt_hd720_pcb_v2 v00 eng

Definition of the three parameters:

1. $1 project_info [eg: IoT_k37mv1_bsp_ry_smt_hd720_pcb_v2]
   
2. $2 version_info [eg: v00 v01 ...]
   
3. $3 compile_mode [eng:user userdebug eng]
   

Execute command to compile:
source build/envsetup.sh
luncher >full_k37mv1_bsp-eng
make -j4

Module compilation
Here would take an example of only compilation launcer:
mm packages/apps/Launcher3/ or enter into directory of packages/apps/Launcher3/, execute mm
Please note that some modules depend on the relationship of package, you need to run mma.

Generated Firmware

• Android6.0

After compiled, the firmware will gather in the directory of: code/IoT_op_smt_hd720_pcb_v2, pack it and name it like the following: IoT_op_smt_hd720_pcb_v2_v00_eng_20180126140300.tar.gz

$ tree IoT_op_smt_hd720_pcb_v2 IoT_op_smt_hd720_pcb_v2
├── images
│ ├── boot.img
│ ├── cache.img
│ ├── lk.bin
│ ├── logo.bin
│ ├── MT6737M_Android_scatter.txt
│ ├── preloader_bd6737m_35g_b_m0.bin
│ ├── recovery.img
│ ├── secro.img
│ ├── system.img
│ ├── trustzone.bin
│ └── userdata.img
└── modem
├── APDB_MT6735_S01_alps-mp-m0.mp1_W17.21
├── _APDB_MT6735_S01_alps-mp-m0.mp1_W17.21.check
└── APDB_MT6735_S01_alps-mp-m0.mp1_W17.21_ENUM

Except the above method, it could also be generated into update.image via Linux_Pack_Firmware.

• Android8.1

After compiled, the firmware will gather in the directory of: code/IoT_ry_smt_hd720_pcb_v2, pack it and name it like the following: IoT_ry_smt_hd720_pcb_v2_v09_eng_20180504163653.tar.gz

$ tree IoT_op_smt_hd720_pcb_v2 IoT_op_smt_hd720_pcb_v2
├── images
│ ├── boot.img
│ ├── cache.img
│ ├── lk.bin
│ ├── logo.bin
│ ├── MT6737M_Android_scatter.txt
│ ├── preloader_k37mv1_bsp.bin
│ ├── recovery.img
│ ├── secro.img
│ ├── system.img
│ ├── trustzone.bin
│ └── userdata.img
└── modem
├── APDB_MT6735_S01_alps-mp-m0.mp1_W18.04
├── _APDB_MT6735_S01_alps-mp-m0.mp1_W18.04.check
└── APDB_MT6735_S01_alps-mp-m0.mp1_W18.04_ENUM

Android Firmware Flashing

Relevant keys and connectors for firmware flashing of Orange Pi 4G-IoT:

List of generated firmwares:
IoT_op_smt_hd720_pcb_v2
├── images
│ ├── boot.img
│ ├── cache.img
│ ├── lk.bin
│ ├── logo.bin
│ ├── MT6737M_Android_scatter.txt
│ ├── preloader_bd6737m_35g_b_m0.bin
│ ├── recovery.img
│ ├── secro.img
│ ├── system.img
│ ├── trustzone.bin
│ └── userdata.img
└── modem
├── APDB_MT6735_S01_alps-mp-m0.mp1_W17.21
├── _APDB_MT6735_S01_alps-mp-m0.mp1_W17.21.check
└── APDB_MT6735_S01_alps-mp-m0.mp1_W17.21_ENUM
You could download the packed image partition files from the official website:
http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/service-and-support/Orange-Pi-4G-IoT.html
Unzip the file with the following command:

$ tar zxvf IoT_op_smt_hd720_pcb_v2_v00_eng_20180126140300.tar.gz

You could get the file which mentioned on the list of generated files, or you could also compile it by yourself with reference of to the part of Android Compilation Environment Construction.

Supporting OS of PC:

• Windows 10
• Windows 7 (32/64 bit)
• Windows 8 (32/64 bit)
• Ubuntu10.04 / 12.04 / 14.04 (32/64bit)

Flash Tool Introduction

You could download the Smart Phone Flash Tool on the download page of Orange Pi 4G-IoT part. There are tools for Windows and Linux version, you could select a suitable version according to your PC environment.
Interface like the following:

Using method for both Windows and Linux versions are same, here will illustrate with Linux version.

Method for Image Flashing

If you cannot connect the Orange Pi 4G-IoT to the computer, pls try：
$sudo apt-get remove modemmanager
$sudo /etc/init.d/udev retstart
And then reboot the computer

Download MTK driver according to the corresponding system under Windows
Unzip Driver_Auto_Installer_EXE_v5.1453.03.rar
And then install it。

• Unzip and open flash tool

$ unzip SP_Flash_Tool_v5.1644_Linux.zip
$ cd SP_Flash_Tool_v5.1644_Linux
$ sudo ./flash_tool.sh

If it is the first time you use this software, you might receive the warn like the following. It is normal to receive this, you could click OK enter into the software. In the future you could manually specified the path of Scatter File.

• Enter into flash mode

a.Switch into Download page like the following:

b.Click choose on the right side of Scatter-loading File and select the path of Scatter File like the following:

c.After double click the selection, the partition information display section will automatically fill the path of each partition file and the absolute starting address to which they are to be flashed.

d.In the top left corner of partition information display section, there would be a drop-down menu.
Three of this options:
Format All + Download // Format all information on the partitions and re-download the selected partition
Firmware Upgrade // Update the difference on the selected partition
Download Only // Re-download no matter there is difference or not
Please note it: Usually update firmware you only need to select Firmware Upgrade, please do not select Format All + Download
It you select Format All, you will lose the calibration information which we worked before sending out products. If this situation is inadvertent, please contact the Orange Pi service and obtain the calibration parameters through the machine code, and re-flash the calibration parameters.

e.Use USB data cable to connect PC and Orange Pi, the right side of Orange Pi will be in red LED.
In this case do not need to connect DC power supply.
f.Click Download button

g.The interface would show like the following after downloaded:

h.Take of the USB cable and insert DC power supply
Wait around 5 seconds, it will display the charging interface of shutdown
When the Power button is loosened after 5 seconds, the system will start to enter the system When the updated partition is more, the first boot will take a long time (the full partition update needs 8min), please be patient.

FAQ

Android8.1 compilation tool chain uses the new Jack server to replace the old compilation tool chain.

• Configure Jack server before compilation

①Modify .jack file on the path of $HOME:

②Modify .jack-settings file on the path of $HOME:

(These two files TCP port should not be used before, and these two files and ports should be with same configure.)

③code/prebuilts/sdk/tools/ directory, execute /jack-admin kill-server and./jack-admin restart-server

• Failed to contact Jack server

If you meet the following error when compilation:
FAILED: /bin/bash -c "(prebuilts/sdk/tools/jack-admin install-server prebuilts/sdk/tools/jack-launcher.jar prebuilts/sdk/tools/jack-server-4.8.ALPHA.jar 2>&1 || (exit 0) ) && (JACK_SERVER_VM_ARGUMENTS=\"-Dfile.encoding=UTF-8 -XX:+TieredCompilation\" prebuilts/sdk/tools/jack-admin start-server 2>&1 || exit 0 ) && (prebuilts/sdk/tools/jack-admin update server prebuilts/sdk/tools/jack-server-4.8.ALPHA.jar 4.8.ALPHA 2>&1 || exit 0 ) && (prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-2.28.RELEASE.jar 2.28.RELEASE || exit 47; prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-3.36.CANDIDATE.jar 3.36.CANDIDATE || exit 47; prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-4.7.BETA.jar 4.7.BETA || exit 47 )"
Writing client settings in /home/user3/.jack-settings
Installing jack server in "/home/user3/.jack-server"

Modify: On directory of code/prebuilts/sdk/tools/, execute ./jack-admin kill-server and ./jack-admin restart-server, then re-compilation

• Out of memory error

First stop running jack server, Then execute jack-admin on the directory of kill-server prebuilts/sdk/tools to kill Jack server Then open jack-admin file, search JACK_SERVER_COMMAND on the file, then change JACK_SERVER_COMMAND="java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=$TMPDIR $JACK_SERVER_VM_ARGUMENTS -cp $LAUNCHER_JAR $LAUNCHER_NAME" into JACK_SERVER_COMMAND="java -Xmx3g -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=$TMPDIR $JACK_SERVER_VM_ARGUMENTS -cp $LAUNCHER_JAR $LAUNCHER_NAME". Which is add option of -Xmx3g.

• FAILED: setup-jack-server

FAILED: setup-jack-server
Jack server installation not found

Solution: Execute the following command on the directory of prebuilts/sdk/tools: ./jack-admin install-server jack-launcher.jar jack-server-4.11.ALPHA.jar
jack-launcher.jar, jack-server-4.11.ALPHA.jar is up to the file name on the directory of prebuilts/sdk/tools.

• Test Issue

When the sim card cannot be recognized, you need to format SD card when it could not recognize it, and need to formatting flash.

Linux Compilation Environment Construction

Get Linux Source Code

• Orange Pi Source Code Downloader

$ sudo apt-get install git
$ git clone https://github.com/orangepi-xunlong/OrangePi_Build.git
$ cd OrangePi_Build
$ ls
Build_OrangePi.sh lib README.md

• Run the Downloader

$ ./Build_OrangePi.sh

Enter the root password and press Enter

Choose 0 Build system with kernel/uboot/rootfs, enter the development board model selection interface.

Choose 23 orangepi 4G-IoT，Press Enter and start download Orange Pi 4G-IoT Linux Source Code.

The downloaded source code will be stored in the same directory as OrangePi_Build. Orange Pi 4G-IoT Linux source code directory structure is as follows

├── bootloader
├─ build.sh -> scripts/build.sh Compile the startup script
├── external Store additional configuration files and partial code
├── kernel
├── output Store the output file, generate it after compiling the source code
├── scripts
└── toolchain

6 directories, 1 file

Compilation of Linux Source Code

• Execute the compilation start up script

$ cd Orange Pi 4G-IoT
$ ./build.sh

According to the board model to choose and press Enter.

Enter the root password and press Enter, then select the function needed to execute.

The functions of each option are as follows:

• 0 Build Release Image Compile full image
• 1 Build Rootfs Compile Rootfs
• 2 Build Uboot Compile preloader and lk
• 2 Build Linux Compile kernel source code

Choose 0 Build Release Image, generate the following complete firmware package

output/images/
├── OrangePi_4g-IoT_ubuntu_xenial_server_linux3.18.19_v1.1
│ ├── boot.img
│ ├── lk.bin
│ ├── lk_emmc.bin
│ ├── lk_sd.bin
│ ├── logo.bin
│ ├── MT6737M_Android_scatter.txt
│ ├── preloader_bd6737m_35g_b_m0.bin
│ ├── rootfs.img
│ └── trustzone.bin
└── OrangePi_4g-IoT_ubuntu_xenial_server_linux3.18.19_v1.1.tar.gz

1 directory, 10 files

Android burning tool can be used to burn the above image file into flash, please refer to Android firmware burning chapter.

Also can execute 3 Install Image into EMMC option to open the burning tool for burning

Linux Firmware Flashing

Currently, Linux systems do not support modems and LCD screens.
You can only log in to the system through the serial port. After connecting to wifi, you can log in through ssh.

The previous "Android Firmware Burning" has introduced how to use the burning tool, so I won't go into details here, just open the burning tool directly.

We click on the far right of the Scatter-loading File column And select the path of Scatter File, as shown below

First disconnect the board from the PC and click the Download button

Next, use a USB download cable to connect the host's USB to the machine's MircoUSB interface. Burning completed

Start the system.
Connect the board to a 5V 3A power adapter. Connect the serial port to see the system startup.

If the onboard space is not enough, you can burn the rootfs to the TF card. Proceed as follows.烧录支
Hold the lk of the mounted TF card rootfs
Click on the content in the box below

Select lk_sd.bin in the popup window.

Click download, download is complete

Burn rootfs to TF card

Prepare a TF card above 8G and class10. After formatting. Burn roofs.img as follows

pv rootfs.img | sudo dd of=/dev/sdb bs=1M

sdb is the device file corresponding to the TF card
If it is a windows system, you can also use Win32DiskImager software to burn.
Start the system
Insert the tf card into the board and start it after power on.

Serial Debugging Tool

First need to prepare a USB to TTL serial cable, need to support 921600 baud rate The debugging serial port of 4G-iot is not brought out, so users need to fly their own wires. The solder joints of the following figure boxes are TXD and RXD of the serial port. GND, RXD and TXD need to be brought out.

Connection mode:
Board TXD Connects USB to TTL RXD
Board RXD Connecting USB to TTL TXD
Board GND Connecting USB to TTL GND

Usage based on Windows platform

In the process of using Orange Pi for project development, in order to get more debugging information, Orange Pi defaults support serial port information debugging. For developers, just prepare the materials mentioned above and can easily get serial debugging information. The serial port debugging tools used by different upper computers are similar, basically refer to the following ways to deploy. There are many tools for serial port debugging using the Windows platform. The commonly used tools are Putty. This section uses putty as an example for deployment.

• Install USB driver

Download the latest version of the driver PL2303_Prolific_DriverInstaller_v130.zip, download and extract.

Select application installation as an administrator

Waiting for installation and click.

• Download and install Putty

Putty can be downloaded from the address below, please choose the version that suits your development environment.

 https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

Double-click the downloaded putty.exe to open putty. The software interface is shown below.

• Acquisition of device information

In Windows 7, we can check whether the serial port connection is normal and the serial port device No. through Device Manager. If the device is not recognized properly, please check if the driver is installed successfully. If there is a problem with the driver installation, try using the 360 Driver Master to scan the installation driver.

• Putty configuration

Set the serial port to the corresponding port number (COM4), turn off the flow control, and set the speed to 921600.

• Start debugging serial output

When the Orange Pi is powered on, putty will automatically print the serial port log information.

Usage based on Linux platform

There is a little difference using putty between Windows platform and Linux platform. The following mainly explains the differences. All operations are based on the Ubuntu 14.04 system.

• Install and start Putty

$ sudo apt-get install putty
$ sudo putty

• Configuration Putty

The serial port number can be viewed via ls /dev/ttyUSB*
The baud rate needs to be set to 921600
And turn off flow control

Usage of GPIO

There are two methods for using GPIO:

There is a general GPIO Operation Interface under Linux, “/sys/class/gpio” 。

You could find the configuration file under the directory of “/sys/class/gpio”, the control program can be divided into four steps:
1、Configuring GPIO：

There is a file ‘export’ under the directory of “/sys/class/gpio”, ， you could invoke it to achieve configuration. This file have numbered the GPIO, or you could also download the schematic or get form this manual.

For example, the 37th pin on 40pins is GPIO123,you could enter：# echo 123 > /sys/class/gpio/export， and come back to the directory “/sys/class/gpio”，there will have a new directory “./gpio123”,which include the configuration files of in and out of the IO port.

Note ： export file have the permission of root write only. You have to execute as root the above command or executable file written in C.

2、Configuring the direction of GPIO (input and output):

Enter the command on the terminal：# echo "out" > /sys/class/gpio/gpio38/direction，which is set this GPIO as output.

3、Configuring the output level of GPIO：

Enter the command on the terminal：#echo 1 > /sys/class/gpio/gpio123/value，which is set this GPIO output high level， enter: echo "0" > /sys/class/gpio/gpio123/value for setting this GPIO output low level。

4、Shutting Down GPIO：

Enter the command on the terminal：#echo "38" > /sys/class/gpio/unexport，which could delete the GPIO configuration file，the directory ‘gpio38’ have been deleted.

Modify and Display the GPIO Status under ADB Mode

Get the Open/Close Status of GPIO : cat /sys/devices/virtual/misc/mtgpio/pin

Enter the command under ADB mode: cat /sys/devices/virtual/misc/mtgpio/pin , then it will show： pin: [mode] [pull_sel] [din] [dout] [pull en] [dir] [ies] [smt]

0:11101010

1:01101010

、、、、、、

22:1-100-10-1-1

、、、、、、、

42：00000110

Corresponding meaning per row：

IO Number：mode，pull select，input value，output value，pull enable，direction，ies

Modify the Status of GPIO：

You could get the 40pin GPIO specifications from this manual or from schematic which have been uploaded to our official website:
http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/service-and-support/Orange-Pi-4G-IoT.html
For example the 37th pin on 40pins is GPIO123,
echo -wdout123 1 > pin -This is Set the GPIO to output high

level echo -wdout123 0> pin -This is Set the GPIO to output

high level

History

Ver	Data	Author	Brief	Publish	Me
1.1	2018-01-26	Younix	Create File	2018-3-27
1.2	2018-05-10	Engineer Pan	Add Android8.1	2018-5-15
1.3	2018-10-18	Engineer Pan	Add Usage of GPIO	2018-10-19
1.4	2019-06-24	Csy	Linux source code compilation and serial port debugging	2019-06-25
1.5	2020-03-18	csy	Linux Firmware Flashing

Download the Orange Pi 4G-IoT User Manual

For more information on using the Orange Pi 4G-IoT, please see the Orange Pi 4G-IoT User Manual. (Click to download)