Difference between revisions of "Matrix - Joystick"
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Revision as of 22:00, 5 February 2016
Contents
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.
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 |
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.
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 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.
Connect to NanoPi
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
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 |
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".
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
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;
}
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.
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
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 |
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".
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
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;
}