Difference between revisions of "Matrix - Joystick"

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[[Matrix - Joystick/zh|查看中文]]
 
[[Matrix - Joystick/zh|查看中文]]
  
 +
==Introduction==
 +
[[File:Joystick01.png|thumb|Joystick]]
 +
* The matrix-joystick module is a two-axis stick module. It consists of two Sliding rheostats and one button. It has two analog outputs and one digital output. Its positional states can be measured as X and Y axis values as the calibrated resistance of the two potentiometers.
 +
* When you move the joystick the sliding rheostats' resistance will change and the corresponding x/y values will change too. When you push the joystick the SW level will turn low.
 +
 +
==Features==
 +
* X and Y axis, and one button
 +
* 2.54mm spacing pin
 +
* PCB dimension(mm): 24 X 32
 +
[[File:stkpcb.png|frameless|400px|双轴摇杆PCB]]
 +
 +
* Pin Description:
 +
{| class="wikitable"
 +
|-
 +
|Pin || Description
 +
|-
 +
|GND    || Ground
 +
|-
 +
|5V    || Supply Voltage 5V
 +
|-
 +
|SW    || Button
 +
|-
 +
|X      || X Axis
 +
|-
 +
|Y    || Y Axis
 +
|}
 +
 +
==Basic Device Operation==
 +
* It has two analog outputs and one digital output. The two analog outputs are measured as X and Y values as the calibrated resistance of the two potentiometers. The digital output is measured as Z value indicating whether or not the button is pressed. <br>
 +
* We extend all three outputs: X, Y and Z and users can use them easily.
 +
 +
 +
==Applications==
 +
The Matrix-Joystick module outputs analog signals which can be converted to digital signals with an ADC converter e.g. the Matrix-Analog_to_Digital_Converter.<br>
 +
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: [[Matrix_-_Analog_to_Digital_Converter]].<br>
 +
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix_Joystick_nanopi_m1.jpg|frameless|600px|Matrix_Joystick_nanopi_m1]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||   
 +
|-
 +
|GND    || NanoPi M1 Pin9
 +
|-
 +
|5V    || NanoPi M1 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-Joystick_nanopi_2.jpg|frameless|600px|Matrix-Joystick_nanopi_2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi 2 Pin9
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPi M2 / NanoPi 2 Fire===
 +
Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:<br>
 +
[[File:Matrix_Joystick_nanopi_m2.jpg|frameless|600px|Matrix_Joystick_nanopi_m2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi M2 Pin9
 +
|-
 +
|5V    || NanoPi M2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix_Joystick_NanoPC-T2.jpg|frameless|600px|Matrix_Joystick_NanoPC-T2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPC-T2 USB Host GND
 +
|-
 +
|5V    || NanoPC-T2 USB Host 5V
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
==Compile & Run Test Program==
 +
Boot your ARM board with Debian and copy the matrix code:
 +
<syntaxhighlight lang="bash">
 +
$ apt-get update && apt-get install git
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
If your cloning is done successfully a "matrix" directory will be generated.
 +
 +
Compile and install Matrix:
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ make && make install
 +
</syntaxhighlight>
 +
 +
Run test program:
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.<br>
 +
Here is what you should observe:<br>
 +
<syntaxhighlight lang="bash">
 +
x=1280 y=1280
 +
</syntaxhighlight>
 +
When you move the stick you will see X and Y's value changes.
 +
 +
==Code Sample==
 +
This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-joystick". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int x, y, board;
 +
   
 +
    x = y = 0;
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    for (i=0; i<PS2_READ_TIMES; i++) {
 +
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
 +
            printf("x=%4d y=%4d\n", x, y);
 +
        }
 +
    }
 +
    system("rmmod "DRIVER_MODULE);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
<!---
 +
==Download Matrix Source Code==
 +
All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git <br>
 +
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.<br>
 +
* The nanopi branch contains the matrix modules' code samples for the NanoPi
 +
* The nanopi 2 branch contains the matrix modules' code samples for the NanoPi 2
 +
* The tiny4412 branch contains the matrix modules' code samples for the Tiny4412
 +
* The raspberrypi branch contains the matrix modules' code samples for the RaspberryPi
 +
 +
Please follow the steps below to get the source code:<br>
 +
Install the git utility on a PC running Ubuntu14.04
 +
<syntaxhighlight lang="bash">
 +
$ sudo apt-get install git
 +
</syntaxhighlight>
 +
 +
Clone the matrix code from GitHub
 +
<syntaxhighlight lang="bash">
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
 +
 +
==Connect to NanoPi 2==
 +
===Hardware Connection===
 +
Please refer to the following connection diagram to connect the Matrix-Joystick to the NanoPi 2:<br>
 +
[[File:Matrix-Joystick_nanopi_2.jpg|frameless|600px|Matrix-Joystick_nanopi_2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi 2 Pin14
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Compile Test Program===
 +
Please login the matrix hub and enter the nanopi2 branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout nanopi2
 +
</syntaxhighlight>
 +
 +
Compile the matrix code
 +
<syntaxhighlight lang="bash">
 +
$ make CROSS_COMPILE=arm-linux- clean
 +
$ make CROSS_COMPILE=arm-linux-
 +
$ make CROSS_COMPILE=arm-linux- install
 +
</syntaxhighlight>
 +
Note: please make sure to install the cross compiler "arm-linux-gcc-4.9.3" on your PC, which is used to compile files for the NanoPi 2.<br>
 +
Generated library files are under the "install/lib" directory. The test program is under the "install/usr/bin" directory.<br>
 +
The modules are under the "modules" directory. The driver's source code is in github: https://github.com/friendlyarm/linux-3.4.y.git <br>
 +
 +
===Run Test Program===
 +
Please insert a TF card which is flashed with Debian to a Linux host and mount its boot and rootfs sections.<br>
 +
We assume the rootfs is mounted to /media/rootfs then please run the following commands to copy the module, library and test program to the card.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cp modules /media/rootfs/ -r
 +
$ cp install/lib/* /media/rootfs/lib/ -d
 +
$ cp install/usr/bin/* /media/rootfs/usr/bin/
 +
</syntaxhighlight>
 +
 +
Insert this TF card to your NanoPi 2, power on and run the following commands to load the driver.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cd /modules
 +
$ insmod pcf8591.ko
 +
</syntaxhighlight>
 +
 +
Start the matrix-joystick program.<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
Here is what you expect to observe:<br>
 +
[[File:matrix-joystick_result.png|frameless||matrix-joystick_result]] <br>
 +
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int x, y;
 +
 +
    x = y = 0;
 +
    for (i=0; i<PS2_READ_TIMES; i++) {
 +
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
 +
            printf("x=%4d y=%4d\n", x, y);
 +
        }
 +
    }
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 +
 +
==Connect to NanoPi==
 +
===Preparations===
 +
Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki: [[NanoPi/zh|NanoPi]] <br>
 +
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.<br>
 +
<syntaxhighlight lang="bash">
 +
$ git clone https://github.com/friendlyarm/linux-4.x.y.git
 +
$ cd linux-4.x.y
 +
$ git checkout nanopi-v4.1.y-matrix
 +
$ make nanopi_defconfig
 +
$ touch .scmversion
 +
$ make
 +
</syntaxhighlight>
 +
 +
===Hardware Connection===
 +
Please refer to the following connection diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the NanoPi <br>
 +
[[File:matrix-joystick_nanopi.jpg|frameless|600px|matrix-joystick_nanopi]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi Pin14
 +
|-
 +
|5V    || NanoPi Pin2
 +
|-
 +
|SW      || Matrix-Analog_to_Digital_Converter A2
 +
|-
 +
|X    || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y    || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 +
===Compile Test Program===
 +
Please login the matrix hub and enter the nanopi branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout nanopi
 +
</syntaxhighlight>
 +
 +
Compile the matrix code
 +
<syntaxhighlight lang="bash">
 +
$ make CROSS_COMPILE=arm-linux- clean
 +
$ make CROSS_COMPILE=arm-linux-
 +
$ make CROSS_COMPILE=arm-linux- install
 +
</syntaxhighlight>
 +
Note: please make sure to install the cross compiler "arm-linux-gcc-4.4.3" on your PC, which is used to compile files for the NanoPi-Debian.<br>
 +
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Joystick" module is "matrix-joystick".<br>
 +
 +
===Run Test Program===
 +
Please copy the library files and test program to the NanoPi
 +
<syntaxhighlight lang="bash">
 +
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
 +
$ cp install/lib/* nanopi_rootfs/lib/ -d
 +
</syntaxhighlight>
 +
 +
Power on the NanoPi and run the following command in Debian's terminal <br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
int mode = 0x0;
 +
 +
if ((devFD = pcf8591Init()) == -1) {
 +
        printf("Fail to init pcf8591 AD\n");
 +
        return -1;
 +
    }
 +
    if (pcf8591SetCtrl(devFD, PCF8591_INIT_AD_CONTROL) == -1) {
 +
        printf("Fail to Set pcf8591 control AD\n");
 +
        pcf8591DeInit(devFD);
 +
        return -1;
 +
    }
 +
 +
    int i = 0;
 +
int x, y, z;
 +
signal(SIGINT, PS2Handler);
 +
for (i=0; i<PS2_READ_TIMES; i++) {
 +
x = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL0);
 +
y = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL1);
 +
z = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL2);
 +
if (z > SW_TRIGGER) {
 +
z = 0;
 +
} else {
 +
z = 1;
 +
}
 +
printf("X=%3d Y=%3d Z=%d\n", x, y, z);
 +
sleep(1);
 +
}
 +
pcf8591DeInit(devFD);
 +
return 0;
 +
}
 +
</syntaxhighlight>
 +
 +
==Connect to Tiny4412==
 +
===Preparations===
 +
Please refer to the Tiny4412's user's manual to install a UbuntuCore on the Tiny4412 and install an appropriate cross compiler on a PC.<br>
 +
Note: only the Tiny4412SDK-1506 carrier board can work with this module.
 +
 +
===Hardware Connection===
 +
Please refer to the following diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the Tiny4412  <br>
 +
[[File:matrix-joystick_tiny4412.jpg|frameless|600px|matrix-joystick_tiny4412]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || Tiny4412 CON16 GND
 +
|-
 +
|5V    || Tiny4412 CON16 5V
 +
|-
 +
|SW      || Matrix-Analog_to_Digital_Converter A2
 +
|-
 +
|X    || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y    || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 +
===Compile Test Program===
 +
Please login the Matrix hub and enter the matrix-tiny4412 branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout tiny4412
 +
</syntaxhighlight>
 +
 +
Compile the matrix code
 +
<syntaxhighlight lang="bash">
 +
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
 +
$ make CROSS_COMPILE=arm-linux-gnueabihf-
 +
$ make CROSS_COMPILE=arm-linux-gnueabihf- install
 +
</syntaxhighlight>
 +
Note: please make sure to install the cross compiler "arm-linux-gnueabihf-gcc-4.7.3" on your PC, which is used to compile files for the Tiny4412-UbuntuCore.<br>
 +
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Joystick" module is "matrix-joystick".
 +
 +
===Run Test Program===
 +
Please copy the library files and test program to the Tiny4412
 +
<syntaxhighlight lang="bash">
 +
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
 +
$ cp install/lib/* tiny4412_rootfs/lib/ -d
 +
</syntaxhighlight>
 +
 +
Power on the Tiny4412 and run the following command in UbuntuCore's terminal
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
int mode = 0x0;
 +
 +
if ((devFD = pcf8591Init()) == -1) {
 +
        printf("Fail to init pcf8591 AD\n");
 +
        return -1;
 +
    }
 +
    if (pcf8591SetCtrl(devFD, PCF8591_INIT_AD_CONTROL) == -1) {
 +
        printf("Fail to Set pcf8591 control AD\n");
 +
        pcf8591DeInit(devFD);
 +
        return -1;
 +
    }
 +
 +
    int i = 0;
 +
int x, y, z;
 +
signal(SIGINT, PS2Handler);
 +
for (i=0; i<PS2_READ_TIMES; i++) {
 +
x = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL0);
 +
y = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL1);
 +
z = pcf8591Read(devFD, mode, PCF8591_AIN_CHANNEL2);
 +
if (z > SW_TRIGGER) {
 +
z = 0;
 +
} else {
 +
z = 1;
 +
}
 +
printf("X=%3d Y=%3d Z=%d\n", x, y, z);
 +
sleep(1);
 +
}
 +
pcf8591DeInit(devFD);
 +
return 0;
 +
}
 +
</syntaxhighlight>
 +
 +
==Connect to RaspberryPi==
 +
 +
==Connect to Arduino==
 +
--->
 +
 +
==Resources==
 +
 +
==Update Log==
 +
===Feb-23-2016===
 +
* Added the description for "NanoPi 2 branch" in Section 4
 +
* Added Section 5: Connect to NanoPi 2
 +
===June-21-2016===
 +
* Re-organized and simplified wiki
 +
<!--
 
==Introduction==
 
==Introduction==
 
[[File:Joystick01.png|thumb|Joystick]]
 
[[File:Joystick01.png|thumb|Joystick]]
 
This module consists of two Sliding rheostats and one button. When you move the joystick the sliding rheostats' resistance will change and the corresponding x/y values will change too. When you push the joystick the SW level will turn low.
 
This module consists of two Sliding rheostats and one button. When you move the joystick the sliding rheostats' resistance will change and the corresponding x/y values will change too. When you push the joystick the SW level will turn low.
  
−
==特性==
+
==Features==
−
* X和Y轴，一个按键
+
* two sliding rheostat and one button
−
* 2.54mm排针接口，接线方便，通用性强
+
* 2.54mm spacing pin
−
==使用方法==
+
 
−
===连接===
+
==How To==
−
*连接到Tiny4412 SDK (1506)
+
===Connection===
−
::1) 需要Tiny4412 SDK先连接[[Matrix - Analog to Digital Converter]]配件
+
*Connect to Tiny4412 SDK (1506)
−
::2) 然后，Joystick与[[Matrix - Analog to Digital Converter]]配件相连接：
+
::1) Please connect the Tiny4412 SDK to [[Matrix - Analog to Digital Converter]]
−
::::GND针脚接地
+
::2) Please connect the Joystick to [[Matrix - Analog to Digital Converter]]:
−
::::V针脚接5V
+
::::GND to ground
−
::::VRX针脚连接Analog to Digital Converter的AIN0针脚
+
::::V to 5V
−
::::VRY针脚连接Analog to Digital Converter的AIN1针脚
+
::::VRX to Analog to Digital Converter's AIN0
−
::::SW针脚连接Analog to Digital Converter的AIN2针脚
+
::::VRY to Analog to Digital Converter's AIN1
 +
::::SW to Analog to Digital Converter's AIN2
  
  
−
===Linux下的C示例===
+
===Code Sample in C Under Linux===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
#include <stdio.h>
 
#include <stdio.h>
Line 77: Line 534:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===编译并运行示例===
+
===Compile and Run===
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
git clone http://github.com/friendlyarm/fa-hardware.git
 
git clone http://github.com/friendlyarm/fa-hardware.git
Line 85: Line 542:
 
make
 
make
 
</syntaxhighlight>
 
</syntaxhighlight>
−
将编译生成的PS2rocker通过ftp上传到开发板上运行即可测试。
+
Copy your compiled bin to your board and you are ready to go.
 +
 
 +
==Resources==
  
−
==相关资料==
+
-->

Latest revision as of 14:03, 21 June 2016

查看中文

1 Introduction

Joystick
  • The matrix-joystick module is a two-axis stick module. It consists of two Sliding rheostats and one button. It has two analog outputs and one digital output. Its positional states can be measured as X and Y axis values as the calibrated resistance of the two potentiometers.
  • When you move the joystick the sliding rheostats' resistance will change and the corresponding x/y values will change too. When you push the joystick the SW level will turn low.

2 Features

  • X and Y axis, and one button
  • 2.54mm spacing pin
  • PCB dimension(mm): 24 X 32

双轴摇杆PCB

  • Pin Description:
Pin Description
GND Ground
5V Supply Voltage 5V
SW Button
X X Axis
Y Y Axis

3 Basic Device Operation

  • It has two analog outputs and one digital output. The two analog outputs are measured as X and Y values as the calibrated resistance of the two potentiometers. The digital output is measured as Z value indicating whether or not the button is pressed.
  • We extend all three outputs: X, Y and Z and users can use them easily.


4 Applications

The Matrix-Joystick module outputs analog signals which can be converted to digital signals with an ADC converter e.g. the Matrix-Analog_to_Digital_Converter.
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: Matrix_-_Analog_to_Digital_Converter.

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix_Joystick_nanopi_m1

Connection Details:

Matrix-Joystick
GND NanoPi M1 Pin9
5V NanoPi M1 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Joystick_nanopi_2

Connection Details:

Matrix-Joystick
GND NanoPi 2 Pin9
5V NanoPi 2 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:
Matrix_Joystick_nanopi_m2

Connection Details:

Matrix-Joystick
GND NanoPi M2 Pin9
5V NanoPi M2 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix_Joystick_NanoPC-T2

Connection Details:

Matrix-Joystick
GND NanoPC-T2 USB Host GND
5V NanoPC-T2 USB Host 5V
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

5 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code: 

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix: 

$ cd matrix
$ make && make install

Run test program: 

$ matrix-joystick

Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.
Here is what you should observe:

x=1280 y=1280

When you move the stick you will see X and Y's value changes.

6 Code Sample

This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-joystick". Here is its source code: 

int main(int argc, char ** argv)
{
    int i = 0;
    int x, y, board;
 
    x = y = 0;
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    for (i=0; i<PS2_READ_TIMES; i++) {
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
            printf("x=%4d y=%4d\n", x, y);
        }
    }
    system("rmmod "DRIVER_MODULE);
    return 0;
}

For more details about this APIs called in this code sample refer to Matrix API reference manual

7 Resources

8 Update Log

8.1 Feb-23-2016

  • Added the description for "NanoPi 2 branch" in Section 4
  • Added Section 5: Connect to NanoPi 2

8.2 June-21-2016

  • Re-organized and simplified wiki
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