Difference between revisions of "Matrix - Joystick"
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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> | 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"> | <syntaxhighlight lang="bash"> | ||
$ cp modules /media/rootfs/ -r | $ cp modules /media/rootfs/ -r | ||
Line 97: | Line 97: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
− | + | Insert this TF card to your NanoPi 2, power on and run the following commands to load the driver.<br> | |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
$ cd /modules | $ cd /modules | ||
Line 103: | Line 103: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
− | + | Start the matrix-joystick program.<br> | |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
$ matrix-joystick | $ matrix-joystick | ||
</syntaxhighlight> | </syntaxhighlight> | ||
− | + | Here is what you expect to observe:<br> | |
[[File:matrix-joystick_result.png|frameless||matrix-joystick_result]] <br> | [[File:matrix-joystick_result.png|frameless||matrix-joystick_result]] <br> | ||
Revision as of 08:53, 23 February 2016
Contents
1 Introduction
- 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
- 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 Download Matrix Source Code
All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.
- 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:
Install the git utility on a PC running Ubuntu14.04
$ sudo apt-get install git
Clone the matrix code from GitHub
$ git clone https://github.com/friendlyarm/matrix.git
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
5 Connect to NanoPi 2
5.1 Hardware Connection
Please refer to the following connection diagram to connect the Matrix-Joystick to the NanoPi 2:
Connection Details:
Matrix-Joystick | |
GND | NanoPi 2 Pin14 |
5V | NanoPi 2 Pin2 |
X | Matrix-Analog_to_Digital_Converter A1 |
Y | Matrix-Analog_to_Digital_Converter A2 |
5.2 Compile Test Program
Please login the matrix hub and enter the nanopi2 branch
$ cd matrix $ git checkout nanopi2
Compile the matrix code
$ make CROSS_COMPILE=arm-linux- clean $ make CROSS_COMPILE=arm-linux- $ make CROSS_COMPILE=arm-linux- install
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.
Generated library files are under the "install/lib" directory. The test program is under the "install/usr/bin" directory.
The modules are under the "modules" directory. The driver's source code is in github: https://github.com/friendlyarm/linux-3.4.y.git
5.3 Run Test Program
Please insert a TF card which is flashed with Debian to a Linux host and mount its boot and rootfs sections.
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.
$ cp modules /media/rootfs/ -r $ cp install/lib/* /media/rootfs/lib/ -d $ cp install/usr/bin/* /media/rootfs/usr/bin/
Insert this TF card to your NanoPi 2, power on and run the following commands to load the driver.
$ cd /modules $ insmod pcf8591.ko
Start the matrix-joystick program.
$ matrix-joystick
Here is what you expect to observe:
5.4 Code Sample
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; }
6 Connect to NanoPi
6.1 Preparations
Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki: NanoPi
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.
$ 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
6.2 Hardware Connection
Please refer to the following connection diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the NanoPi
Connection Details:
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 |
6.3 Compile Test Program
Please login the matrix hub and enter the nanopi branch
$ cd matrix $ git checkout nanopi
Compile the matrix code
$ make CROSS_COMPILE=arm-linux- clean $ make CROSS_COMPILE=arm-linux- $ make CROSS_COMPILE=arm-linux- install
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.
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".
6.4 Run Test Program
Please copy the library files and test program to the NanoPi
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/ $ cp install/lib/* nanopi_rootfs/lib/ -d
Power on the NanoPi and run the following command in Debian's terminal
$ matrix-joystick
6.5 Code Sample
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; }
7 Connect to Tiny4412
7.1 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.
Note: only the Tiny4412SDK-1506 carrier board can work with this module.
7.2 Hardware Connection
Please refer to the following diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the Tiny4412
Connection Details:
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 |
7.3 Compile Test Program
Please login the Matrix hub and enter the matrix-tiny4412 branch
$ cd matrix $ git checkout tiny4412
Compile the matrix code
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean $ make CROSS_COMPILE=arm-linux-gnueabihf- $ make CROSS_COMPILE=arm-linux-gnueabihf- install
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.
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".
7.4 Run Test Program
Please copy the library files and test program to the Tiny4412
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/ $ cp install/lib/* tiny4412_rootfs/lib/ -d
Power on the Tiny4412 and run the following command in UbuntuCore's terminal
$ matrix-joystick
7.5 Code Sample
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; }
8 Connect to RaspberryPi
9 Connect to Arduino
10 Resources
11 Update Log
11.1 Feb-23-2016
- Added the description for "NanoPi 2 branch" in Section 4
- Added Section 5: Connect to NanoPi 2