Difference between revisions of "Matrix - Button"

From FriendlyELEC WiKi
Jump to: navigation, search
(→‎Applications)
 
(41 intermediate revisions by 5 users not shown)
Line 1: Line 1:
 
[[Matrix - Button/zh|查看中文]]
 
[[Matrix - Button/zh|查看中文]]
  
−
[[File:Maker.jpg]]
+
==Introduction==
 +
[[File:Btn01.jpg|thumb|Button]]
 +
* The Matrix-Button module is used to detect button events.
 +
* If the button is not pressed S will output high otherwise S will output low.
  
−
{| width="100%"
+
==Features==
−
|  • [[Button 01]]  ||   • [[Button 01]]   ||   • [[Button 01]]
+
* 3 PIN interface
 +
* PCB dimension (mm): 8 x 24
 +
[[File:btn002.png | frameless|400px|BTN-01.PCB]]
 +
 
 +
* Pin Description:
 +
{| class="wikitable"
 +
|-
 +
|Pin || Description
 +
|-
 +
|S    || GPIO
 +
|-
 +
|V    || Supply Voltage 5V
 +
|-
 +
|G    || Ground
 
|}
 
|}
  
−
Test
+
==Basic Device Operation==
 +
* The Matrix-Button is an instant(non self-lock) button. The button's status can be read from pin S in the 3-pin 2.54 mm spacing pin header.
 +
* If the button is not pressed S will output high otherwise S will output low.
 +
 
 +
==Applications==
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix-Button_nanopi_m1.jpg|frameless|600px|Matrix-Button_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPi M1
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-Button_nanopi_2.jpg|frameless|600px|Matrix-Button_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPi 2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===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-Button_nanopi_m2.jpg|frameless|600px|Matrix-Button_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPi M2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix-Button_NanoPC-T2.jpg|frameless|600px|Matrix-Button_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPC-T2
 +
|-
 +
|S    || Pin15
 +
|-
 +
|V    || Pin29
 +
|-
 +
|G    || Pin30
 +
|}
 +
 
 +
==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-gpio_int
 +
</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">
 +
Waiting event...
 +
Device[0] value is 1
 +
</syntaxhighlight>
 +
When you press the button an event will be detected.
 +
 
 +
==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-gpio_int". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i, board;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(dev)];
 +
 
 +
    if ((board = boardInit()) < 0)
 +
        printf("Fail to init board\n");
 +
   
 +
    if (argc == 2) {
 +
        dev[0].pin = atoi(argv[1]);
 +
    }
 +
    printf("Using GPIO_PIN(%d)\n", dev[0].pin);
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    if (board == BOARD_NANOPI_T2)
 +
        dev[0].pin = GPIO_PIN(15);
 +
    if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Waiting event...\n");
 +
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(dev))) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("dev[%d] value: %d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(devFD);
 +
    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-Button to the NanoPi 2:<br>
 +
[[File:Matrix-Button_nanopi_2.jpg|frameless|600px|Matrix-Button_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPi 2     
 +
|-
 +
|S  || Pin7
 +
|-
 +
|V  || Pin4
 +
|-
 +
|G  || Pin6
 +
|}
 +
===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 NanoPi2.<br>
 +
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Button" module is "matrix-button".<br>
 +
The driver is under the modules directory and its 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 driver, 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.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cd /modules
 +
$ insmod matrix_gpio_int.ko
 +
</syntaxhighlight>
 +
 
 +
Start the matrix-button program<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-button
 +
</syntaxhighlight>
 +
 
 +
Here is what you should expect:<br>
 +
[[File:matrix-button_result.png|frameless|600px|matrix-button_result]]
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
static struct sensor button[] = {
 +
        {
 +
                GPIO_PIN(7),
 +
                IRQ_TYPE_EDGE_FALLING,
 +
        }
 +
};
 +
int main(int argc, char ** argv)
 +
{
 +
    int i;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(button)];
 +
    int devFD = -1;
 +
 
 +
    if (argc == 2) {
 +
        button[0].pin = atoi(argv[1]);
 +
    }
 +
   
 +
    printf("Using GPIO_PIN(%d)\n", button[0].pin);
 +
    if ((devFD =sensorInit(button, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Press the button...\n");
 +
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("Button[%d]:%d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(devFD);
 +
    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]] & [[How_to_build_the_Compiling_Environment/zh|How to Build the Compiling Environment]] <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>
 +
A newly generated zImage will be under arch/arm/boot/. You can replace the one under "sd-fuse_nanopi/prebuilt" with this new image file.
 +
 
 +
===Hardware Connection===
 +
Please refer to the following connection diagram to connect the Matrix-Button to the NanoPi <br>
 +
[[File:matrix-button_nanopi.jpg|frameless|600px|matrix-button_nanopi]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || NanoPi     
 +
|-
 +
|S  || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G      || Pin6
 +
|}
 +
 
 +
===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-Button" module is "matrix-button".<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 these files to the card.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cp install/lib/* /media/rootfs/lib/ -d
 +
$ cp install/usr/bin/* /media/rootfs/usr/bin/
 +
</syntaxhighlight>
 +
 
 +
Insert this TF card to your NanoPi, power on and run the following commands.<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-button
 +
</syntaxhighlight>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(button)];
 +
    int devFD = -1;
 +
 
 +
    printf("Using pin GPIO_PIN1\n");
 +
    if ((devFD =sensorInit(button, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Press the button...\n");
 +
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("Button[%d]:%d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(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-Button to the Tiny4412 <br>
 +
[[File:matrix-button_tiny4412.jpg|frameless|600px|matrix-button_tiny4412]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Button || Tiny4412
 +
|-
 +
|S  || GPIO1 S
 +
|-
 +
|V    || GPIO1  5V
 +
|-
 +
|G  || GPIO1 GND
 +
|}
 +
 
 +
===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-Button" module is "matrix-button".
 +
 
 +
===Run Test Program===
 +
Please insert an SD card which is flashed with UbuntuCore 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 these files the card.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cp install/usr/bin/* /media/rootfs/usr/bin/
 +
$ cp install/lib/* /media/rootfs/lib/ -d
 +
</syntaxhighlight>
 +
 
 +
Insert this card to your Tiny4412, power on and run the following command to start the Matrix-Button test program。<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-button
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to a Tiny4412.
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(button)];
 +
    int devFD = -1;
 +
 +
    printf("Using pin GPIO_PIN1\n");
 +
    if ((devFD =sensorInit(button, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Press the button...\n");
 +
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("Button[%d]:%d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(devFD);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 
 +
==Connect to RaspberryPi==
 +
 
 +
==Connect to Arduino==
 +
--->
 +
 
 +
==Resources==
 +
 
 +
==Update Log==
 +
===Feb-19-2016===
 +
* In section 4 added NanoPi 2 branch
 +
* In section 5.2 added the driver and its source code's locations
 +
 
 +
===June-17-2016===
 +
* Re-organized and simplified wiki
 +
 
 +
<!--
 +
 
 +
==Introduction==
 +
[[Image:Btn.png|thumb|按键]]
 +
The Matrix-Button is an instant(non self-lock) button. The button's status can be read from pin S in the 3-pin 2.54 mm spacing pin header. If the button is not pressed S will output high otherwise S will output low.
 +
 
 +
==Features==
 +
* Instant, non self-lock
 +
* Tiny, easy to be used in various situations
 +
* 2.54mm spacing pin
 +
 
 +
==How To==
 +
===Connection===
 +
*Connect to Tiny4412 SDK (1506)
 +
::Connect the module's pin S to GPIO PIN1, pin V to 5V and pin G grounded
 +
 
 +
===Code Sample in C Under Linux===
 +
<syntaxhighlight lang="c">
 +
#include <stdio.h>
 +
#include "libfahw.h"
 +
 
 +
static struct sensor button[] = {
 +
        {
 +
                TINY4412_GPIO_PIN1,
 +
                IRQ_TYPE_EDGE_FALLING,
 +
        }
 +
};
 +
 
 +
int main(void)
 +
{
 +
    int i;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(button)];
 +
    int devFD = -1;
 +
    if ((devFD =sensorInit(button, ARRAY_SIZE(button))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Press the button...\n");
 +
    if (( retSize = sensorRead(devFD, value, ARRAY_SIZE(button)) ) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("Button[%d]:%d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(devFD);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 
 +
===Compile and Run===
 +
<syntaxhighlight lang="bash">
 +
git clone http://github.com/friendlyarm/fa-hardware.git
 +
cd fa-hardware
 +
cd demo
 +
cd matrix-button
 +
make
 +
</syntaxhighlight>
 +
Copy your compiled bin to your board and you are ready to go.
 +
 
 +
==Resources==
 +
 
 +
-->

Latest revision as of 10:31, 19 June 2016

查看中文

1 Introduction

Button
  • The Matrix-Button module is used to detect button events.
  • If the button is not pressed S will output high otherwise S will output low.

2 Features

  • 3 PIN interface
  • PCB dimension (mm): 8 x 24

BTN-01.PCB

  • Pin Description:
Pin Description
S GPIO
V Supply Voltage 5V
G Ground

3 Basic Device Operation

  • The Matrix-Button is an instant(non self-lock) button. The button's status can be read from pin S in the 3-pin 2.54 mm spacing pin header.
  • If the button is not pressed S will output high otherwise S will output low.

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-Button_nanopi_m1

Connection Details:

Matrix-Button NanoPi M1
S Pin7
V Pin4
G Pin6

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Button_nanopi_2

Connection Details:

Matrix-Button NanoPi 2
S Pin7
V Pin4
G Pin6

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-Button_nanopi_m2

Connection Details:

Matrix-Button NanoPi M2
S Pin7
V Pin4
G Pin6

4.4 Connect to NanoPC-T2

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

Connection Details:

Matrix-Button NanoPC-T2
S Pin15
V Pin29
G Pin30

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-gpio_int

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:

Waiting event...
Device[0] value is 1

When you press the button an event will be detected.

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-gpio_int". Here is its source code: 

int main(int argc, char ** argv)
{
    int i, board;
    int retSize = -1;
    char value[ARRAY_SIZE(dev)];
 
    if ((board = boardInit()) < 0)
        printf("Fail to init board\n");
 
    if (argc == 2) {
        dev[0].pin = atoi(argv[1]);
    }
    printf("Using GPIO_PIN(%d)\n", dev[0].pin);
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    if (board == BOARD_NANOPI_T2)
        dev[0].pin = GPIO_PIN(15);
    if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) {
        printf("Fail to init sensor\n");
        return -1;
    }
    printf("Waiting event...\n");
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(dev))) == -1) {
        printf("Fail to read sensors\n");
    }
    if (retSize > 0) {
        i = 0;
        for (i=0; i<retSize; i++) {
            printf("dev[%d] value: %d\n", i, value[i]);
        }
    }
    sensorDeinit(devFD);
    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-19-2016

  • In section 4 added NanoPi 2 branch
  • In section 5.2 added the driver and its source code's locations

8.2 June-17-2016

  • Re-organized and simplified wiki


Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_Button&oldid=6108"