Difference between revisions of "Matrix - 3-Axis Digital Accelerometer"

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==Introduction==
 
==Introduction==
 
[[File:3AD.png|thumb|3-Axis Digital Accelerometer]]
 
[[File:3AD.png|thumb|3-Axis Digital Accelerometer]]
−
三轴重力加速度主要功能是用作测量x\y\z方向上的速度，可利用测量到的速度计算当前角度。模块可以使用IIC或SPI进行通信。此配件搭载了一颗ADXL345芯片。ADXL345是Anolog Device公司的三轴数字重力传感器，13-bit精度，采集范围可以是+-2g，+-4g，+-8g和+-16g，通讯方式为SPI或I2C。配件采用5V供电，PCB上的电源转换芯片输出3.3V给ADXL345。
+
* This module measures the static acceleration of gravity in three axis x, y and z resulting from motion or shock.
 +
* Its digital interface is IIC or SPI.
 +
* It is integrated with an ADXL345 chip with high resolution (13-bit) measurement at ±2g, ±4g, ±8g and ±16g.
 +
* The module is powered by 5V and converts 5V to 3.3V to ADXL345.
  
−
This module measures the static acceleration of gravity in three axis x, y and z resulting from motion or shock. Its digital interface is IIC or SPI. It is integrated with an ADXL345 chip which collects  . The module is powered by 5V and converts 5V to 3.3V to ADXL345
+
==Features==
 +
* I2C, 3.3V
 +
* 13-bit, up to +-16g
 +
* 2.54mm spacing pin interface
 +
* PCB dimension(mm): 16 x 32
 +
[[File:adxpcb.png|frameless|400px|重力加速度PCB]]
 +
 
 +
* Pin Description: <br>
 +
{| class="wikitable"
 +
|-
 +
|Pin || Description     
 +
|-
 +
|INT2    || Interrupt
 +
|-
 +
|INT1    || Interrupt
 +
|-
 +
|CS      || Enable
 +
|-
 +
|SCL    || I2C SCL
 +
|-
 +
|SDA    || I2C SDA
 +
|-
 +
|SDO    || Set Slave Address
 +
|-
 +
|5V        || Supply Voltage 5V
 +
|-
 +
|GND    || Ground
 +
|}
 +
 
 +
==Basic Device Operation==
 +
* The ADXL345 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is acces-sible through either a SPI (3- or 4-wire) or I2C digital interface.
 +
* The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli-cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 mg/LSB) enables measurement of inclination changes less than 1.0°.
 +
* The ADXL345 conforms to the UM1024 I2C Specification. It supports standard (100 kHz) and fast (400 kHz) data transfer modes. If the CS is tied high it will be in the I2C mode. If the CS or ALT ADDRESS pin is floating or unconnected the state will be unknown.
 +
* The module's I2C connection diagram is as follows:
 +
[[File:三轴重力.png|frameless|400px|三轴重力加速度]]
 +
 
 +
<!---
 +
==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 matrix-nanopi branch contains the matrix modules' code samples for the NanoPi
 +
* The matrix-nanopi2 branch contains the matrix modules' code samples for the NanoPi 2
 +
* The matrix-tiny4412 branch contains the matrix modules' code samples for the Tiny4412;
 +
* The matrix-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.
 +
--->
 +
 
 +
==Applications==
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix-3_Axis_Digital_Accelerometer_nanopi_m1.jpg|frameless|600px|Matrix-3_Axis_Digital_Accelerometer_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPi M1     
 +
|-
 +
|INT2    || NC
 +
|-
 +
|INT1    || NC
 +
|-
 +
|CS      || Pin2
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SDO    || High, it is connected to the GPIO pin-header's 3.3V
 +
|-
 +
|5V      || Pin4
 +
|-
 +
|GND    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-3_Axis_Digital_Accelerometer_nanopi_2.jpg|frameless|600px|Matrix-3_Axis_Digital_Accelerometer_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPi 2     
 +
|-
 +
|INT2    || NC
 +
|-
 +
|INT1    || NC
 +
|-
 +
|CS      || Pin2
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SDO    || High, it is connected to the GPIO pin-header's 3.3V
 +
|-
 +
|5V      || Pin4
 +
|-
 +
|GND    || 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-3_Axis_Digital_Accelerometer_nanopi_M2.jpg|frameless|600px|Matrix-3_Axis_Digital_Accelerometer_nanopi_M2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPi M2     
 +
|-
 +
|INT2    || NC
 +
|-
 +
|INT1    || NC
 +
|-
 +
|CS      || Pin2
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SDO    || High, it is connected to the GPIO pin-header's 3.3V
 +
|-
 +
|5V      || Pin4
 +
|-
 +
|GND    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix-3_Axis_Digital_Accelerometer_NanoPC-T2.jpg|frameless|600px|Matrix-3_Axis_Digital_Accelerometer_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPC-T2
 +
|-
 +
|INT2    || NC
 +
|-
 +
|INT1    || NC
 +
|-
 +
|CS      || USB Host 5V
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin6
 +
|-
 +
|SDO    || USB Host 5V
 +
|-
 +
|5V      || Pin29
 +
|-
 +
|GND    || Pin30
 +
|}
 +
 
 +
 
 +
<!---
 +
==Connect to NanoPi 2==
 +
===Hardware Connection===
 +
Please refer to the following connection diagram to connect the Matrix-3_Axis_Digital_Accelerometer to the NanoPi 2:<br>
 +
[[File:Matrix-3_Axis_Digital_Accelerometer_nanopi_2.jpg|frameless|600px|Matrix-3_Axis_Digital_Accelerometer_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPi 2     
 +
|-
 +
|INT2    || Not Connected
 +
|-
 +
|INT1    || Not Connected
 +
|-
 +
|CS      || Pin2, High
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SDO    || Pin2
 +
|-
 +
|5V      || Pin4
 +
|-
 +
|GND    || 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. The modules are under the "modules" 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>
 +
--->
 +
 
 +
==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-accelerometer
 +
</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">
 +
The position is (-6, 3, 236)
 +
</syntaxhighlight>
 +
 
 +
<!---
 +
===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 adxl34x.ko
 +
$ insmod adxl34x-i2c.ko
 +
</syntaxhighlight>
 +
 
 +
Start the matrix-accelerometer program.<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-accelerometer
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to a NanoPi 2.<br>
 +
Here is what you should expect:<br>
 +
[[File:matrix-accelerometer_result.png|frameless|600px|matrix-accelerometer_result]]
 +
--->
 +
 
 +
==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-3_axis_digital_accelerometer". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    char position[BUF_SIZE];
 +
    int board;
 +
   
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    system("modprobe adxl34x");
 +
    system("modprobe adxl34x-i2c");
 +
    memset(position, 0, BUF_SIZE);
 +
    if (adxl34xRead(position) > 0) {
 +
        printf("The position is %s", position);
 +
    } else {
 +
        printf("Fail to get position\n");       
 +
    }
 +
    system("rmmod adxl34x-i2c");
 +
    system("rmmod adxl34x");
 +
   
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
 
 +
<!---
 +
==Connect to NanoPi==
 +
===Preparations===
 +
You need to install a Debian on the NanoPi and have a PC which has an appropriate cross compiler ready. For details you can refer to wiki:[[NanoPi/zh|NanoPi]]
 +
 
 +
===Hardware Connection===
 +
Please refer to the following diagrams to connect "Matrix-3_Axis_Digital_Accelerometer" to the NanoPi <br>
 +
[[File:matrix-3_axis_digital_accelerometer_nanopi.jpg|frameless|600px|matrix-3_axis_digital_accelerometer_nanopi]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || NanoPi     
 +
|-
 +
|INT2    || Floating
 +
|-
 +
|INT1    || Floating
 +
|-
 +
|CS      || Pin1
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SDO    || Pin2
 +
|-
 +
|5V       || Pin4
 +
|-
 +
|GND    || Pin6
 +
|}
 +
 
 +
===Compile Test Program===
 +
Please login the Matrix git and enter the matrix-nanopi branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout matrix-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-3_Axis_Digital_Accelerometer" module is "matrix-3_axis_digital_accelerometer".<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>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to a NanoPi.
 +
<syntaxhighlight lang="bash">
 +
$ matrix-3_axis_digital_accelerometer
 +
</syntaxhighlight>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    char position[BUF_SIZE];
 +
    memset(position, 0, BUF_SIZE);
 +
   
 +
    if (adxl34xRead(position) > 0) {
 +
        printf("Get position: %s", position);
 +
    } else {
 +
        printf("Fail to get position\n");       
 +
    }
 +
    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-3_Axis_Digital_Accelerometer to the Tiny4412 <br>
 +
[[File:matrix-3_axis_digital_accelerometer_tiny4412.jpg|frameless|600px|matrix-3_axis_digital_accelerometer_tiny4412]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-3_Axis_Digital_Accelerometer || Tiny4412     
 +
|-
 +
|INT2    || Floating
 +
|-
 +
|INT1    || Floating
 +
|-
 +
|CS      || CON16 5V
 +
|-
 +
|SCL    || CON18 SCL
 +
|-
 +
|SDA    || CON18 SDA
 +
|-
 +
|SDO    || CON14 5V
 +
|-
 +
|5V        || CON18 5V
 +
|-
 +
|GND    || CON18 GND
 +
|}
 +
 
 +
===Compile Test Program===
 +
Please login the Matrix hub and enter the matrix-tiny4412 branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout matrix-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-3_Axis_Digital_Accelerometer" module is "matrix-3_axis_digital_accelerometer".<br>
 +
 
 +
===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>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to a Tiny4412.
 +
<syntaxhighlight lang="bash">
 +
$ matrix-3_axis_digital_accelerometer
 +
</syntaxhighlight>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    char position[BUF_SIZE];
 +
    memset(position, 0, BUF_SIZE);
 +
   
 +
    if (adxl34xRead(position) > 0) {
 +
        printf("Get position: %s", position);
 +
    } else {
 +
        printf("Fail to get position\n");       
 +
    }
 +
    return 0;
 +
}
 +
 
 +
</syntaxhighlight>
 +
 
 +
==Connect to RaspberryPi==
 +
 
 +
==Connect to Arduino==
 +
--->
 +
 
 +
==Resources==
 +
[http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf ADXL345.pdf]
 +
 
 +
 
 +
==Update Log==
 +
===Feb-23-2016===
 +
* Changed CS pin spec in Section 5.1
 +
* Added driver's source code location in Section 5.2
 +
 
 +
===June-17-2016===
 +
* Re-organized and simplified wiki
 +
 
 +
 
 +
 
 +
 
 +
 
 +
<!--
  
  
Line 15: Line 484:
 
==How To==
 
==How To==
 
===Connection===
 
===Connection===
−
*Connect Tiny4412 SDK (1506)
+
*Connect to Tiny4412 SDK (1506)
 
::GND:  Ground
 
::GND:  Ground
 
::VCC:  5V
 
::VCC:  5V
−
::INT2：N/A
+
::INT2: NC, empty pin
−
::INT1: N/A
+
::INT1: NC, empty pin
 
::CS:  5V
 
::CS:  5V
 
::SCL:  I2C SCL
 
::SCL:  I2C SCL
Line 58: Line 527:
  
 
==Resources==
 
==Resources==
 +
 +
-->

Latest revision as of 10:22, 19 June 2016

查看中文

1 Introduction

3-Axis Digital Accelerometer
  • This module measures the static acceleration of gravity in three axis x, y and z resulting from motion or shock.
  • Its digital interface is IIC or SPI.
  • It is integrated with an ADXL345 chip with high resolution (13-bit) measurement at ±2g, ±4g, ±8g and ±16g.
  • The module is powered by 5V and converts 5V to 3.3V to ADXL345.

2 Features

  • I2C, 3.3V
  • 13-bit, up to +-16g
  • 2.54mm spacing pin interface
  • PCB dimension(mm): 16 x 32

重力加速度PCB

  • Pin Description:
Pin Description
INT2 Interrupt
INT1 Interrupt
CS Enable
SCL I2C SCL
SDA I2C SDA
SDO Set Slave Address
5V Supply Voltage 5V
GND Ground

3 Basic Device Operation

  • The ADXL345 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is acces-sible through either a SPI (3- or 4-wire) or I2C digital interface.
  • The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli-cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 mg/LSB) enables measurement of inclination changes less than 1.0°.
  • The ADXL345 conforms to the UM1024 I2C Specification. It supports standard (100 kHz) and fast (400 kHz) data transfer modes. If the CS is tied high it will be in the I2C mode. If the CS or ALT ADDRESS pin is floating or unconnected the state will be unknown.
  • The module's I2C connection diagram is as follows:

三轴重力加速度


4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-3_Axis_Digital_Accelerometer_nanopi_m1

Connection Details:

Matrix-3_Axis_Digital_Accelerometer NanoPi M1
INT2 NC
INT1 NC
CS Pin2
SCL Pin5
SDA Pin3
SDO High, it is connected to the GPIO pin-header's 3.3V
5V Pin4
GND Pin6

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-3_Axis_Digital_Accelerometer_nanopi_2

Connection Details:

Matrix-3_Axis_Digital_Accelerometer NanoPi 2
INT2 NC
INT1 NC
CS Pin2
SCL Pin5
SDA Pin3
SDO High, it is connected to the GPIO pin-header's 3.3V
5V Pin4
GND 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-3_Axis_Digital_Accelerometer_nanopi_M2

Connection Details:

Matrix-3_Axis_Digital_Accelerometer NanoPi M2
INT2 NC
INT1 NC
CS Pin2
SCL Pin5
SDA Pin3
SDO High, it is connected to the GPIO pin-header's 3.3V
5V Pin4
GND Pin6

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix-3_Axis_Digital_Accelerometer_NanoPC-T2

Connection Details:

Matrix-3_Axis_Digital_Accelerometer NanoPC-T2
INT2 NC
INT1 NC
CS USB Host 5V
SCL Pin5
SDA Pin6
SDO USB Host 5V
5V Pin29
GND 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-accelerometer

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:

The position is (-6, 3, 236)


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-3_axis_digital_accelerometer". Here is its source code: 

int main(int argc, char ** argv) 
{
    char position[BUF_SIZE];
    int board;
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    system("modprobe adxl34x");
    system("modprobe adxl34x-i2c");
    memset(position, 0, BUF_SIZE);
    if (adxl34xRead(position) > 0) {
        printf("The position is %s", position);
    } else {
        printf("Fail to get position\n");        
    }
    system("rmmod adxl34x-i2c");
    system("rmmod adxl34x");
 
    return 0;
}

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


7 Resources

ADXL345.pdf


8 Update Log

8.1 Feb-23-2016

  • Changed CS pin spec in Section 5.1
  • Added driver's source code location in Section 5.2

8.2 June-17-2016

  • Re-organized and simplified wiki




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