Matrix - Compact Kit B

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1 Introduction

Matrix-Compact Kit B.png
  • The Matrix Compact Kit B is a FriendlyARM developed compact board with various hardware resources, interfaces and ports. It contains user keys, LEDs, buzzer, ADC, compass, temperature sensor, IR receiver and TFT interface. It works with FriendlyARM's NanoPi 2 Fire and NanoPi M2 via its 40 pin male connector and is compatible with Raspberry Pi and Arduino boards. In addition you can connect various devices to its IO pin-header.

2 Features

Matrix - Compact Kit B contains the following components:

  • 0.9 TFT LCD
  • 3 x Switch
  • 4 x 5mm LED
  • Buzzer
  • ADC
  • Potentiometer
  • 40pin Female Connector
  • 4pin pin-header – I2C
  • 4pin pin-header – UART
  • 3pin double pin-header – 3.3V and GND
  • 18B20 Temperature Sensor
  • IR Receiver
  • 10 x 3pin pin-header – 3 x AIO & 7 x DIO (two can be configured to PWM and four can be configured to SPI)
  • Compass

3 Dimensional Diagram and Pin Description

  • PCB Dimension(mm):64 x 40

Matrix-Compact Kit B PCB.png

  • 40 pin female connector's pin description
Pin# Name Pin# Name
1 SYS_3.3V 2 VDD_5V
3 I2C0_SDA 4 VDD_5V
5 I2C0_SCL 6 DGND
7 GPIOD8/PPM 8 UART3_TXD/GPIOD21
9 DGND 10 UART3_RXD/GPIOD17
11 UART4_TX/GPIOB29 12 GPIOD1/PWM0
13 GPIOB30 14 DGND
15 GPIOB31 16 GPIOC14/PWM2
17 SYS_3.3V 18 GPIOB27
19 SPI0_MOSI/GPIOC31 20 DGND
21 SPI0_MISO/GPIOD0 22 UART4_RX/GPIOB28
23 SPI0_CLK/GPIOC29 24 SPI0_CS/GPIOC30
25 DGND 26 GPIOB26
27 I2C1_SDA 28 I2C1_SCL
29 GPIOC8 30 DGND
31 GPIOC7 32 GPIOC28
33 GPIOC13/PWM1 34 DGND
35 SPI2_MISO/GPIOC11 36 SPI2_CS/GPIOC10
37 AliveGPIO3 38 SPI2_MOSI/GPIOC12
39 DGND 40 SPI2_CLK/GPIOC9
  • 30 pin header's pin description
Pin# Name Pin# Name Pin# Name
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_Pi33
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
18B20 and IR Receiver's Layout
  • DS18B20 and IR receiver's pin description
Module Pin# Name Pin# Name Pin# Name
18B20 1 VDD_5V 2 DATA 3 GND
IR Receiver 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 Fire

5.1 Hardware Connection

Refer to the following connection diagram to connect the Matrix-Compact_Kit_B to the NanoPi 2 Fire
Matrix-Compact_Kit_B_nanopi2

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 Fire, 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:
03

5.5 Test Buzzer

Jump the buzzer to "ON" and run the following commands:

$ cd /modules
$ insmod matrix_pwm.ko
$ matrix-buzzer

Here is what you expect to observe:
matrix-buzzer_result
You will hear the buzzer beeping and the PWM's default frequency is 1KHz and the duty cycle is 50%.

5.6 Access LED

LED CPU GPIO Linux ID(used in the Linux Kernel) ID on the Compact Kit B board
Red LED1 GPIOB28 60 28
Green LED2 GPIOC7 71 31
Blue LED3 ALIVEGPIO3 163 37
Yellow LED4 GPIOC11 75 35

Take LED1 as an example, run the following commands:

$ cd /sys/class/gpio/
$ echo 60 > export
$ echo out > gpio60/direction
$ echo 1 > gpio60/value

"1" turns on LED1 and "0" turns off LED1.

5.7 Read User Key Value

User Key CPU GPIO Linux ID(used in the Linux Kernel) ID on the Compact Kit B board
KEY1 GPIOC10 74 36
KEY2 GPIOC12 76 38
KEY3 GPIOC9 73 40

Take KEY1 as an example run the following commands:

$ cd /sys/class/gpio/
$ echo 74 > export
$ echo in > gpio74/direction
$ cat gpio74/value

When KEY1 is pressed "value" is 0 otherwise "value" is 1.

5.8 Test AD

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

$ cd /modules
$ insmod pcf8591.ko
$ matrix-adc

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

5.9 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:
matrix-cpt_kit_result_cps

5.10 Test Temperature Sensor

Run the following commands to test the temperature sensor:

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

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

5.11 Test IR Receiver

Run the following commands to test the IR receiver:

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

gpio=92 means pin GPIOC28 is used. 92 is the index number used in the Linux kernel.
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:
matrix-ir_receiver_result

5.12 Code Samples in Python

6 Connect to NanoPi

7 Connect to Tiny4412

8 Connect to Raspberry Pi

9 Connect to Arduino

10 Resources

11 Update Log

11.1 May-23-2016

  • Released English version