Difference between revisions of "Matrix - Compact Kit B"

Revision as of 03:12, 23 May 2016

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1 Introduction

• 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

• 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

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:

5.5 测试蜂鸣器

将蜂鸣器的跳线接到ON，执行以下命令控制蜂鸣器：

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

运行效果如下：

可以听到蜂鸣器在响，默认输出的PWM频率为1KHz，占用比为50%。

5.6 控制LED

以LED1为例，执行以下命令控制LED：

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

1表示点亮LED1,0表示熄灭LED1。

5.7 读按键值

以KEY1为例，执行以下命令读取按键值：

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

当KEY1按下时value=0，KEY1弹起时value=1。

5.8 测试AD转换

执行以下命令获得Channel0的AD转换值：

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

通过旋转可调电阻可以改变AD转换值，运行效果如下：

5.9 测试指南针

执行以下命令获得当前方向：

$ matrix-compass

通过改变开发板的朝向可以获得不同的方向值，运行效果如下：

5.10 测试温度传感器

执行以下命令操作温度传感器：

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

gpio=72表示使用引脚GPIOC8，72是该引脚在Linux里的索引号。
运行效果如下：

5.11 测试红外接收头

执行以下命令操作红外接收头：

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

gpio=92表示使用引脚GPIOC28，92是该引脚在Linux里的索引号。
成功加载驱动后，会在/dev/input/目录下生成一个event设备节点，这里假设生成的设备节点为event1。

开源软件input-utils可以读取event设备的数据，它的使用方法如下：

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

1表示读设备节点event1。

用一个普通的遥控器往模块发送数据，可看到运行效果如下：

5.12 通过Python控制

6 与NanoPi连接使用

7 与Tiny4412连接使用

8 与RaspberryPi连接使用

9 与Arduino连接使用

10 相关资料

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