Difference between revisions of "Matrix - Compact Kit"

Revision as of 13:50, 29 March 2016

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1 Introduction

• The Matrix-Compact Kit is a compact board with various hardware resources, interfaces and ports. It includes user keys, LED, buzzer, ADC, compass, temperature sensor, IR receiver, TFT port and etc. This board can be connected to the NanoPi, NanoPi 2 and Raspberry Pi via its 40 pin header. In addition you can connect other external modules to its GPIOs.

2 Features

Matrix - Compact Kit has the following onboard resources:

• 0.9 TFT LCD

• 3 x tact switch

• 4 x 5mm LED

• Buzzer

• ADC

• Potentiometer

• 40 pin female connector

• 4 pin header - I2C interface

• 4 pin header - UART interface

• 3 pin double row pin-header - 3.3V and GND

• DS18B20 temperature sensor

• IR receiver

• 10 x 3 pin header - 3 x AIO, 7 x DIO (two of them can be configured to PWM and four of them can be configured to SPI)

• Compass

3 Dimensional Diagram and Pin Description

• PCB Dimension (mm):

Matrix-Compact_Kit Interface

• 40 pin female connector's pin description

Pin#	Name	Pin#	Name
1	VDD_SYS_3.3V	2	VDD_5V
3	I2C0_SDA	4	VDD_5V
5	I2C0_SCL	6	DGND
7	GPIOB28	8	UART3_TXD
9	DGND	10	UART3_RXD
11	GPIOB29	12	GPIOB26
13	GPIOB30	14	DGND
15	GPIOB31	16	PWM2
17	VDD_SYS_3.3V	18	GPIOB27
19	SPI0_MOSI	20	DGND
21	SPI0_MISO	22	PWM0
23	SPI0_CLK	24	SPI0_CS
25	DGND	26	PWM1
27	I2C1_SDA	28	I2C1_SCL
29	GPIOC8	30	DGND
31	SPI2_CLK	32	GPIOC28
33	SPI2_CS	34	DGND
35	SPI2_MOSI	36	GPIOC7
37	SPI2_MISO	38	ALIVEGPIO2
39	DGND	40	ALIVEGPIO3

Matrix-Compact_Kit Interface

• 30 pin header's pin description

Ch#	G	Ch#	V	Ch#	S
1	GND	2	VDD_5V	3	A1_PCF
4	GND	5	VDD_5V	6	A2_PCF
7	GND	8	VDD_5V	9	A3_PCF
10	GND	11	VDD_5V	12	D1_Pi11
13	GND	14	VDD_5V	15	D2_Pi26
16	GND	17	VDD_5V	18	D3_Pi16
19	GND	20	VDD_5V	21	D4_Pi19
22	GND	23	VDD_5V	24	D5_Pi21
25	GND	26	VDD_5V	27	D6_Pi23
28	GND	29	VDD_5V	30	D7_Pi24

DS18B20 and IR receiver's interface

• DS18B20 and IR receiver's pin description

Pin#	Name	Pin#	Name	Pin#	Name
1	VDD_5V	2	DATA	3	GND
1	DATA	2	GND	3	VDD_5V

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 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;

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

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

5.2 Compile Test Program

Login to 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: 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 Copy Test Program

Insert a TF card which is flashed with Debian into a Linux host and mount its boot and rootfs sections.
We assume the rootfs is mounted to /media/rootfs then 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/

5.4 Test LCD

Insert this TF card to your NanoPi 2, power on and run the following commands.

$ cd /modules
$ insmod fbtft_device.ko name=matrix-st7735s gpios=dc:58,reset:63,cs:59
$ sudo FRAMEBUFFER=/dev/fb-st7735s startx &

"fbtft_device" is the LCD's driver.After it is loaded the LCD will be initialized.
"startx" sets the LCD to the output device. Here is what you should expect:

5.5 Access LED

We used LED1 as an example. Run the following commands to access LED1:

$ cd /sys/class/gpio/
$ echo 74 > export
$ echo out > gpio74/direction
$ echo 1 > gpio74/value

1 indicates LED on and 0 indicates LED1 off.

5.6 Test Key

We used KEY1 as an example. Running the following commands reads its value:

$ cd /sys/class/gpio/
$ echo 71 > export
$ echo in > gpio71/direction
$ cat gpio71/value

After you press KEY1 the value will be 0. After it is released the value will be 1.

5.7 Test AD

Run the following command to get Channel 0's value:

$ matrix-adc

When you turn the resistor the AD value will change. Here is what you should expect:

5.8 Test Compass

Run the following command to activate the compass:

$ matrix-compass

When you change the module's direction you will get a changing value. Here is what you should expect:

5.9 Test Temperature Sensor

Refer to the following connection diagram to connect the Matrix-Compact_Kit to the DS18B20 temperature sensor:

Run the following commands:

$ cd /modules
$ insmod w1-gpio.ko
$ insmod w1-gpio-board gpio=72
$ matrix-temp_sensor

gpio=72 means pin GPIOC8 is used. 72 is the index number in Linux.
Here is what you should expect:

5.10 Test IR Receiver

Refer to the following connection diagram to connect the Matrix-Compact_Kit to the VS1833B IR receiver:

Run the following commands:

$ cd /modules
$ insmod matrix_ir_recv.ko gpio=92

gpio=92 means pin GPIOC28 is used. 92 is the index number in Linux.
After the driver is successfully loaded a device node will be generated under /dev/input/. We assume it is event1 in our example.

An open source utility "input-utils" can be used to read a device's data. Here is how to do it:

$ apt-get install input-utils
$ input-events 1

1 stands for device node event1。

If you send data to the IR receiver with a remote control you will be able to see this:

5.11 Code Samples in Python

The Python version is 2.7.9 in the following samples
Install the Python libraries and modules:

$ apt-get install Python-dev
$ apt-get install libi2c-dev

The python code is in our github:

$ git clone https://github.com/friendlyarm/matrix-python.git

After it is done a matrix-python directory will be generated.

Access LED：

$ cd matrix-python/Matrix.GPIO
$ python setup.py install
$ python test/matrix_output.py 33

The red LED will be flashing.

Read KEY1：

$ cd matrix-python/Matrix.GPIO
$ python setup.py install
$ python test/matrix_input.py 36

When you press KEY1 "value" will be set to 0. When you release KEY1 "value" will be set to 1.

Test AD:

$ cd matrix-python/modules
$ insmod pcf8591.ko
$ cd ../Matrix.pcf8591
$ python setup.py install
$ python test/matrix_adc.py

When you change the resistor AD value will be changed accordingly.

Test Compass:

$ cd matrix-python/Matrix.I2C
$ python setup.py install
$ python test/matrix_compass.py

When you rotate the compass you will get changing direction values

6 Connect to NanoPi

7 Connect to Tiny4412

8 Connect to RaspberryPi

9 Connect to Arduino

10 Resources

• [Schematic](Matrix - Compact Kit-Schematic.pdf)
• [Schematic](Matrix - Compact Kit-Schematic.pdf)

11 Update Log

11.1 Feb-17-2016

• Added 5.9, 5.10 and 5.11

11.2 Feb-24-2016

• Added the driver's source code location in Section 5.2

11.3 Mar-21-2016

• Corrected typo in Section 5.9
• Added lib installation steps in Section 5.11

11.4 Mar-29-2016

• Corrected expression errors