Difference between revisions of "Matrix - LED"

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[[Matrix - LED/zh|查看中文]]
 
[[Matrix - LED/zh|查看中文]]
  
−
==介绍==
+
==Introduction==
 
[[File:led01.png|thumb|LED]]
 
[[File:led01.png|thumb|LED]]
−
一个直径为5mm的LED，3-Pin 2.54mm排针，V接电源，G接地，S信号通过一个三极管放大控制LED的导通或关闭。您可以向S输出静态的高低电平信号，也可以输出变化的PWM信号，信号电平可以是3.3V或5V。当您向S输出高电平时LED以最大亮度发光，低电平就完全熄灭，可变占空比的PWM信号可以调节发光的亮度。我们提供红、绿、蓝三种颜色的配件供您购买。
+
[[File:led02.png|thumb|LED]]
 +
[[File:led03.png|thumb|LED]]
 +
The Matrix-LED is an LED module with three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.
 +
 +
==Features==
 +
* GPIO/PWM interface, 3.3/5V, PWM brightness control
 +
* Small, easy to be used in various situations
 +
* 2.54 mm spacing pin
 +
* PCB Dimension(mm): 8 x 24
 +
[[File:led02pcb.png | frameless|400px|LED-01.PCB]]
  
−
==特性==
+
* Pin Description:
−
* GPIO或PWM控制，3.3/5V电平，亮度通过PWM可调
+
{| class="wikitable"
−
* 体积小巧， 带固定孔，方便嵌入到外壳
+
|-
−
* 2.54mm排针接口，接线方便，通用性强
+
|Pin || Description
 +
|-
 +
|S    || GPIO
 +
|-
 +
|V    || Supply Voltage 5V
 +
|-
 +
|G    || Ground
 +
|}
  
−
==使用方法==
+
==Basic Device Operation==
−
===连接===
+
The module has three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.
−
*连接到Tiny4412 SDK (1506)
+
−
::将配件S针脚连接到GPIO PIN1, V接5V，G接地
+
  
−
===Linux下的C示例===
+
==Applications==
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix-LED_nanopi_m1.jpg|frameless|600px|Matrix-LED_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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-LED_nanopi_2.jpg|frameless|600px|Matrix-LED_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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-LED_nanopi_m2.jpg|frameless|600px|Matrix-LED_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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-LED_NanoPC-T2.jpg|frameless|600px|Matrix-LED_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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_out
 +
</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">
 +
1: gpio status change
 +
2: gpio status change
 +
3: gpio status change
 +
4: gpio status change
 +
5: gpio status change
 +
</syntaxhighlight>
 +
The LED will be blinking continuously.
 +
 
 +
==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_out". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int pin = GPIO_PIN(7);
 +
    int i, value, board;
 +
    int ret = -1;
 +
   
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
    if (board == BOARD_NANOPI_T2)
 +
        pin = GPIO_PIN(15);
 +
   
 +
    if (argc == 2)
 +
        pin = GPIO_PIN(atoi(argv[1]));
 +
    if ((ret = exportGPIOPin(pin)) == -1) { 
 +
        printf("exportGPIOPin(%d) failed\n", pin);
 +
    }
 +
    if ((ret = setGPIODirection(pin, GPIO_OUT)) == -1) {
 +
        printf("setGPIODirection(%d) failed\n", pin);
 +
    }
 +
    for (i = 0; i < STATUS_CHANGE_TIMES; i++) {
 +
        if (i % 2) {
 +
            value = GPIO_HIGH;
 +
        } else {
 +
            value = GPIO_LOW;
 +
        }
 +
        if ((ret = setGPIOValue(pin, value)) > 0) {
 +
            printf("%d: GPIO_PIN(%d) value is %d\n", i+1, pin, value);
 +
        } else {
 +
            printf("setGPIOValue(%d) failed\n", pin);
 +
        }
 +
        sleep(1);
 +
    }
 +
    unexportGPIOPin(pin);
 +
    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-LED to the NanoPi 2:<br>
 +
[[File:Matrix-LED_nanopi_2.jpg|frameless|600px|Matrix-LED_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || NanoPi
 +
|-
 +
|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 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 command to test.<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-led
 +
</syntaxhighlight>
 +
Here is what you expect to observe:<br>
 +
[[File:matrix-led_result.png|frameless|600px|matrix-led_result]] <br>
 +
You can observe that the LED is flashing.
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int ledPin = GPIO_PIN(7);
 +
    int i = 0;
 +
    int ret = -1;
 +
 
 +
    if ((ret = exportGPIOPin(ledPin)) == -1) { 
 +
        printf("exportGPIOPin(%d) failed\n", ledPin);
 +
    }
 +
    if ((ret = setGPIODirection(ledPin, GPIO_OUT)) == -1) {
 +
        printf("setGPIODirection(%d) failed\n", ledPin);
 +
    }
 +
 
 +
    for (i = 0; i < LED_BLINK_TIMES; i++) {
 +
        if (i % 2) {
 +
            ret = setGPIOValue(ledPin, GPIO_HIGH);
 +
        } else {
 +
            ret = setGPIOValue(ledPin, GPIO_LOW);
 +
        }
 +
        if (ret == -1) {
 +
            printf("setGPIOValue(%d) failed\n", ledPin);
 +
        }
 +
        printf("LED blinking times %d\n", i);
 +
        sleep(1);
 +
    }
 +
    unexportGPIOPin(ledPin);
 +
    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-LED to the NanoPi <br>
 +
[[File:matrix-led_nanopi.jpg|frameless|600px|matrix-led_nanopi]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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-LED" module is "matrix-led".<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-led
 +
</syntaxhighlight>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int ledPin = GPIO_PIN1;
 +
    int i = 0;
 +
    int ret = -1;
 +
 
 +
    if ((ret = exportGPIOPin(ledPin)) == -1) { 
 +
        printf("exportGPIOPin(%d) failed\n", ledPin);
 +
    }
 +
    if ((ret = setGPIODirection(ledPin, GPIO_OUT)) == -1) {
 +
        printf("setGPIODirection(%d) failed\n", ledPin);
 +
    }
 +
 
 +
    for (i = 0; i < LED_BLINK_TIMES; i++) {
 +
        if (i % 2) {
 +
            ret = setGPIOValue(ledPin, GPIO_HIGH);
 +
        } else {
 +
            ret = setGPIOValue(ledPin, GPIO_LOW);
 +
        }
 +
        if (ret == -1) {
 +
            printf("setGPIOValue(%d) failed\n", ledPin);
 +
        }
 +
        printf("LED blinking times %d\n", i);
 +
        sleep(1);
 +
    }
 +
    unexportGPIOPin(ledPin);
 +
    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-LED to the Tiny4412 <br>
 +
[[File:matrix-led_tiny4412.jpg|frameless|600px|matrix-led_tiny4412]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-LED || 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-LED" module is "matrix-led".
 +
 
 +
===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 <br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-led
 +
</syntaxhighlight>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int ledPin = GPIO_PIN1;
 +
    int i = 0;
 +
    int ret = -1;
 +
 
 +
    if ((ret = exportGPIOPin(ledPin)) == -1) { 
 +
        printf("exportGPIOPin(%d) failed\n", ledPin);
 +
    }
 +
    if ((ret = setGPIODirection(ledPin, GPIO_OUT)) == -1) {
 +
        printf("setGPIODirection(%d) failed\n", ledPin);
 +
    }
 +
 
 +
    for (i = 0; i < LED_BLINK_TIMES; i++) {
 +
        if (i % 2) {
 +
            ret = setGPIOValue(ledPin, GPIO_HIGH);
 +
        } else {
 +
            ret = setGPIOValue(ledPin, GPIO_LOW);
 +
        }
 +
        if (ret == -1) {
 +
            printf("setGPIOValue(%d) failed\n", ledPin);
 +
        }
 +
        printf("LED blinking times %d\n", i);
 +
        sleep(1);
 +
    }
 +
    unexportGPIOPin(ledPin);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 
 +
==Connect to RaspberryPi==
 +
 
 +
==Connect to Arduino==
 +
--->
 +
 
 +
==Resources==
 +
 
 +
==Update Log==
 +
===Feb-18-2016===
 +
* 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==
 +
[[File:led01.png|thumb|LED]]
 +
[[File:led02.png|thumb|LED]]
 +
[[File:led03.png|thumb|LED]]
 +
On this module we put a 5mm LED and extend all pins to a 3-Pin 2.54mm spacing pin header. Pin V is power, G is grounded and S is data which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances. We provide red, green and white LED modules.
 +
 
 +
==Features==
 +
* GPIO/PWM interface, 3.3/5V, PWM brightness control
 +
* 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, V to 5V and G grounded
 +
 
 +
===Code Sample in C Under Linux===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
#include <stdio.h>
 
#include <stdio.h>
Line 53: Line 509:
 
</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 61: Line 517:
 
make
 
make
 
</syntaxhighlight>
 
</syntaxhighlight>
−
将编译生成的LED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 14:36, 21 June 2016

查看中文

1 Introduction

LED
LED
LED

The Matrix-LED is an LED module with three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.

2 Features

  • GPIO/PWM interface, 3.3/5V, PWM brightness control
  • Small, easy to be used in various situations
  • 2.54 mm spacing pin
  • PCB Dimension(mm): 8 x 24

LED-01.PCB

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

3 Basic Device Operation

The module has three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-LED_nanopi_m1

Connection Details:

Matrix-LED 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-LED_nanopi_2

Connection Details:

Matrix-LED 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-LED_nanopi_m2

Connection Details:

Matrix-LED 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-LED_NanoPC-T2

Connection Details:

Matrix-LED 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_out

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:

1: gpio status change
2: gpio status change
3: gpio status change
4: gpio status change
5: gpio status change

The LED will be blinking continuously.

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_out". Here is its source code: 

int main(int argc, char ** argv) 
{
    int pin = GPIO_PIN(7); 
    int i, value, board;
    int ret = -1;
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
    if (board == BOARD_NANOPI_T2)
        pin = GPIO_PIN(15);
 
    if (argc == 2)
        pin = GPIO_PIN(atoi(argv[1]));
    if ((ret = exportGPIOPin(pin)) == -1) {   
        printf("exportGPIOPin(%d) failed\n", pin);
    }
    if ((ret = setGPIODirection(pin, GPIO_OUT)) == -1) {
        printf("setGPIODirection(%d) failed\n", pin);
    }
    for (i = 0; i < STATUS_CHANGE_TIMES; i++) {
        if (i % 2) {
            value = GPIO_HIGH;
        } else {
            value = GPIO_LOW;
        }
        if ((ret = setGPIOValue(pin, value)) > 0) {
            printf("%d: GPIO_PIN(%d) value is %d\n", i+1, pin, value);
        } else {
            printf("setGPIOValue(%d) failed\n", pin);
        }
        sleep(1);
    }
    unexportGPIOPin(pin);
    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-18-2016

  • 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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