Step 1: Install dependencies

Debian 11 kernel 5.10 essentials

apt update && sudo apt upgrade -y
apt install build-essential -y
apt install git -y

Step 2: Install JAVA

You will need JDK 18.0.2.1 for installing and properly utilising MRAA library. To install JDK in your ROCK 4C+ please follow the steps below:

• Change directory to /usr/local

 radxa@rock-4c-plus:~$ cd /usr/local

• Create a java folder

radxa@rock-4c-plus:/usr/local$ mkdir java
mkdir: cannot create directory ‘java’: Permission denied
radxa@rock-4c-plus:/usr/local$ sudo mkdir java
[sudo] password for radxa:

• Change directory to /usr/local/java

radxa@rock-4c-plus:/usr/local$ cd java

• Download the JDK 18.0.2.1 tarball

radxa@rock-4c-plus:/usr/local/java$ sudo wget https://download.oracle.com/java/18/archive/jdk-18.0.2.1_linux-aarch64_bin.tar.gz
--2023-07-10 13:10:15--  https://download.oracle.com/java/18/archive/jdk-18.0.2.1_linux-aarch64_bin.tar.gz
Resolving download.oracle.com (download.oracle.com)... 2.23.220.73
Connecting to download.oracle.com (download.oracle.com)|2.23.220.73|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 181090510 (173M) [application/x-gzip]
Saving to: ‘jdk-18.0.2.1_linux-aarch64_bin.tar.gz’
jdk-18.0.2.1_linux-aarch64_bin.tar.gz           100%[====================================================================================================>] 172.70M  8.07MB/s    in 22s
2023-07-10 13:10:36 (7.99 MB/s) - ‘jdk-18.0.2.1_linux-aarch64_bin.tar.gz’ saved [181090510/181090510]
c
radxa@rock-4c-plus:/usr/local/java$ sudo tar xzvf jdk-18.0.2.1_linux-aarch64_bin.tar.gz
radxa@rock-4c-plus:/usr/local/java$ ls -la
total 176860
drwxr-xr-x  3 root root      4096 Jul 10 13:10 .
drwxr-xr-x 11 root root      4096 Jul 10 13:04 ..
drwxr-xr-x  9 root root      4096 Jul 10 13:11 jdk-18.0.2.1
-rw-r--r--  1 root root 181090510 Aug 16  2022 jdk-18.0.2.1_linux-aarch64_bin.tar.gz
radxa@rock-4c-plus:~$ export JAVA_HOME=/usr/local/java/jdk-18.0.2.1/
radxa@rock-4c-plus:~$ export PATH=${JAVA_HOME}/bin:$PATH

• Verify JAVA version

radxa@rock-4c-plus:~$ java -version
java version "18.0.2.1" 2022-08-18
Java(TM) SE Runtime Environment (build 18.0.2.1+1-1)
Java HotSpot(TM) 64-Bit Server VM (build 18.0.2.1+1-1, mixed mode, sharing)

Step 3: Install build dependencies

radxa@rock-4c-plus:~$ sudo apt-get install -y git build-essential swig python-dev python3-dev libnode-dev  cmake libjson-c-dev
radxa@rock-4c-plus:~$ sudo apt-get install -y libc6 libgcc1 libstdc++6 python python2.7 libpython2.7 python3.9 libpython3.8 python3-dev python3
radxa@rock-4c-plus:~$ sudo apt-get install -y libgtest-dev pkg-config cmake-data

Step 4: Install MRAA

To download the MRAA library source code open a terminal on your ROCK 4C+ board and issue the following command:

radxa@rock-4c-plus:~$ git clone -b master https://github.com/radxa/mraa.git
Cloning into 'mraa'...
remote: Enumerating objects: 13029, done.
remote: Counting objects: 100% (274/274), done.
remote: Compressing objects: 100% (176/176), done.
remote: Total 13029 (delta 161), reused 152 (delta 88), pack-reused 12755
Receiving objects: 100% (13029/13029), 3.48 MiB | 7.88 MiB/s, done.
Resolving deltas: 100% (9252/9252), done.

Step 5: Build MRAA source code

cd mraa

Once you clone the MRAA git repository as shown above, you should see a folder in your current directory called mraa.

Change directory to mraa and have a look into the content inside. There should be a file called CMakeLists.txt inside the mraa folder. Open this file and modify the following files as shown below:

• Modify the MRAA Source Code

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 250d910..a5d82cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.11)
+cmake_minimum_required (VERSION 3.13.10)
project (mraa C CXX)
 
FIND_PACKAGE (Threads REQUIRED)
@@ -142,11 +142,14 @@ set (CMAKE_SWIG_FLAGS "")
find_path (SYSTEM_USR_DIR "stdlib.h")
include_directories (${SYSTEM_USR_DIR})
 
+cmake_policy(SET CMP0078 OLD)
+cmake_policy(SET CMP0086 NEW)
+
option (BUILDDOC "Build all doc." OFF)
-option (BUILDSWIG "Build swig modules." ON)
+option (BUILDSWIG "Build swig modules." OFF)
option (BUILDSWIGPYTHON "Build swig python modules." ON)
option (BUILDSWIGNODE "Build swig node modules." ON)
-option (BUILDSWIGJAVA "Build Java API." OFF)
+option (BUILDSWIGJAVA "Build Java API." ON)
option (USBPLAT "Detection USB platform." OFF)
option (FIRMATA "Add Firmata support to mraa." OFF)
option (ONEWIRE "Add Onewire support to mraa." ON)
diff --git a/include/version.h b/include/version.h
index 47366ef..3a567a1 100644
--- a/include/version.h
+++ b/include/version.h
@@ -11,8 +11,8 @@
extern "C" {
#endif
 
-const char* gVERSION;
-const char* gVERSION_SHORT;
+extern const char* gVERSION;
+extern const char* gVERSION_SHORT;
 
#ifdef __cplusplus
}

• Build the source code

radxa@rock-4c-plus:~/mraa$ mkdir build
radxa@rock-4c-plus:~/mraa$ cd build/
radxa@rock-4c-plus:~/mraa/build$ cmake ..
radxa@rock-4c-plus:~/mraa/build$ make
radxa@rock-4c-plus:~/mraa/build$ sudo make install
radxa@rock-4c-plus:~/mraa/build$ sudo ldconfig

Step 6: MRAA test and verification

radxa@rock-4c-plus:~/mraa/build$ mraa-gpio list
01         3V3:
02          5V:
03        SDA7: GPIO I2C
04          5V:
05        SCL7: GPIO I2C
06         GND:
07    SPI2_CLK: GPIO SPI
08        TXD2: GPIO UART
09         GND:
10        RXD2: GPIO UART
11        PWM0: GPIO PWM
12    GPIO4_A3: GPIO
13        PWM1: GPIO PWM
14         GND:
15    GPIO4_C5: GPIO
16    GPIO4_D2: GPIO
17         3V3:
18    GPIO4_D4: GPIO
19 SPI1TX,TXD4: GPIO SPI  UART
20         GND:
21 SPI1RX,RXD4: GPIO SPI  UART
22    GPIO4_D5: GPIO
23     SPI1CLK: GPIO SPI
24      SPI1CS: GPIO SPI
25         GND:
26     ADC_IN0: AIO
27        SDA2: GPIO I2C
28        SCL2: GPIO I2C
29 SCL6,SPI2RX: GPIO I2C  SPI
30         GND:
31 SDA6,SPI2TX: GPIO I2C  SPI
32    GPIO3_C0: GPIO
33      SPI2CS: GPIO SPI
34         GND:
35    GPIO4_A5: GPIO
36    GPIO4_A4: GPIO
37    GPIO4_D6: GPIO
38    GPIO4_A6: GPIO
39         GND:
40    GPIO4_A7: GPIO
radxa@rock-4c-plus:~/mraa/build$

Step 7: MRAA version check

radxa@rock-4c-plus:~/mraa/build$ mraa-gpio version
Version v2.1.0-26-gd59936f on ROCK Pi 4

Summary

Congrats! If you have followed the steps above then you should have successfully installed MRAA library on your ROCK 4C+ single board computer.

MRAA library is super handy when it comes to configuring GPIO on ROCK boards.

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