Difference between revisions of "Matrix - I2C LCD1602"

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* IIC Module PCB dimension(mm): 16 x 42  
 
* IIC Module PCB dimension(mm): 16 x 42  
 
* LCD1602 PCB dimension (mm): 36 x 80
 
* LCD1602 PCB dimension (mm): 36 x 80
−
[[File:lpdpcb.png|frameless|400px|IIC模块PCB]]
+
[[File:lpdpcb.png|frameless|400px|IIC Module PCB]]
 
[[File:lcdpcb.png|frameless|400px|LCD1602 PCB]]
 
[[File:lcdpcb.png|frameless|400px|LCD1602 PCB]]
  
Line 30: Line 30:
 
|}
 
|}
  
−
==工作原理==
+
==Basic Device Operation==
−
===PCF8574工作原理===
+
===PCF8574===
−
* PCF8574模块为i2c并行口扩展电路，即对输入的i2c字节数据实现8位并行io输出（P0-P7），因此开发板可以可以通过i2c总线实现io扩展。
+
* The PCF8574 has I2C parallel expansion. It has an 8bit (P0 - P7) I2C interface.
−
* PCF8574需要与i2c总线进行通信，由i2c总线特性可以知道i2c总线传输数据到该模块时必须有该模块的器件地址。本模块使用的PCF8574芯片型号为PCF8574T，其地址为如下图所示：
+
* The PCF8574 communicates with a master via I2C. The PCF8574's chip model is PCF8574T whose address specification is as follows:
 
[[File:pcf8574.png|frameless|400px|PCF8574]]
 
[[File:pcf8574.png|frameless|400px|PCF8574]]
−
* 由模块的原理图可以看出A2-A0全部置1，则7位器件地址为0x27（0100111），RW默认为0，此时模块为写模式。
+
* If A2 - A0 are all set to 1 the 7bit address will be 0x27(0100111). By default RW is 0 and it is in the write mode.
−
* 这时打开i2c-0设备并设置好器件地址了，便可以成功对模块进行写操作了。
+
* In the write mode after opening the i2c-0 device and setting up its address the master can write data to it.
−
* 当要对模块进行读操作需要把模块设置为读模式（RW改置1），由于这里没有用到，不详细介绍，具体可以参看PCF8574的datasheet。
+
* If you need to read data from it you will need to set the module to the read mode (RW set to 1). Please refer to the PCF8574's datasheet for more details.
  
−
===LCD1602工作原理===
+
===LCD1602===
−
* 由模块的原理图可以看出PCF8574模块的输出引脚P0-P7与LCD模块的引脚连接如下图：
+
* The connection diagram between the PCF8574 module and the LCD module is as follows:
 
[[File:1602.png|frameless|400px|1602]]
 
[[File:1602.png|frameless|400px|1602]]
−
* RS为指令/数据控制位，RW为读/写控制位，E为使能位（边沿触发），BL为背光灯控制位，D4-D7为数据位。
+
* RS is instruction/data register selection. RW is read/write selection. E is enable signal(edge triggering). BL is back light control. D4-D7 are data bits.
−
* 由于LCD用到四个数据位，因此只能使用4线来驱动。通过指令表我们可以对LCD进行写指令设置LCD的工作转态，但这里的指令/数据（DB7-DB0）是八位的，而LCD却是4线驱动，因此每次写指令/数据时是先写高四位（DB7-DB4），再写低四位（DB3-DB0）。
+
* The LCD module is controlled by four data bits through which we can send instructions to control its state. Because it has eight instruction/data bits (DB7 - DB0) when writing each instruction/data we need to write the most significant four bits DB7 - DB4 first and then the least significant four bits DB3 - DB0.
−
* 注意：LCD内置了192个常用字模，存放在CGROM，所以我们在显示字符A时可以直接写入“A”，此外LCD还有8个允许用户自定义的字符产生的RAM，称为CGRAM，这里由于没有涉及到所以不介绍，有兴趣的用户可以去了解一下。
+
* Note: the LCD module has 192 most commonly used characters stored in CGROM. When we write a common character e.g "A" it will directly display "A". In addition it can store up to eight user defined characters in RAM called CGRAM.
  
−
==下载Matrix源码==
+
==Applications==
−
Matrix配件相关的代码是完全开源的，统一由一个仓库进行管理：git://github.com/friendlyarm/matrix.git <br>
+
===Connect to NanoPi M1===
−
该仓库里不同的分支代表着Matrix配件所支持的不同开发板。<br>
+
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
−
* nanopi分支包含了Matrix对NanoPi的支持；
+
[[File:Matrix-I2C_LCD1602_nanopi_m1.jpg|frameless|600px|Matrix-I2C_LCD1602_nanopi_m1]]
−
* tiny4412分支包含了Matrix对Tiny4412的支持；
+
−
* raspberrypi分支包含了Matrix对RaspberryPi的支持；
+
  
−
在主机PC上安装git，以Ubuntu14.04为例
+
Connection Details
 +
{| class="wikitable"
 +
|-
 +
|Matrix-I2C_LCD1602 || NanoPi M1   
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|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-I2C_LCD1602_nanopi_2.jpg|frameless|600px|Matrix-I2C_LCD1602_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-I2C_LCD1602 || NanoPi 2   
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|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-I2C_LCD1602_nanopi_m2.jpg|frameless|600px|Matrix-I2C_LCD1602_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-I2C_LCD1602 || NanoPi M2
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|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-I2C_LCD1602_NanoPC-T2.jpg|frameless|600px|Matrix-I2C_LCD1602_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-I2C_LCD1602 || NanoPC-T2
 +
|-
 +
|SDA    || Pin6
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|5V    || Pin29
 +
|-
 +
|GND    || 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-lcd1602
 +
</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>
 +
[[File:matrix-lcd1602_result.png|frameless|600px|matrix-lcd1602_result]] <br>
 +
The LCD will show the following two lines:<br>
 +
"  B&G Char LCD"    <br>
 +
"--by FriendlyARM" <br>
 +
If the LCD doesn't show them clearly you can adjust the resistor to highlight the characters.
 +
 
 +
==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-i2c_lcd1602". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int devFD, board;
 +
    int i2cDev = 0;
 +
   
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    if (argc == 2)
 +
        i2cDev = atoi(argv[1]);
 +
    if ((devFD = LCD1602Init(i2cDev)) == -1) {
 +
        printf("Fail to init LCD1602\n");
 +
        return -1;
 +
    }
 +
    if (LCD1602Clear(devFD) == -1) {
 +
        printf("Fail to Clear\n");
 +
    }
 +
    printf("clearing LCD1602\n");
 +
    sleep(1);
 +
    if (LCD1602DispLines(devFD, "  B&G Char LCD", "--by FriendlyARM") == -1) {
 +
        printf("Fail to Display String\n");
 +
    }
 +
    printf("displaying LCD1602\n");
 +
    LCD1602DeInit(devFD);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
 
 +
==Connect to Arduino Board==
 +
===Preparations===
 +
Make sure your Arduino board can work. Here is a reference link - https://www.arduino.cc/en/Guide/HomePage <br>
 +
Here we tried the Arduino Uno.
 +
 
 +
===Hardware Connection===
 +
Refer to the following diagram to connect the Matrix-I2C_LCD1602 to an Arduino Uno<br>
 +
[[File:matrix-i2c_lcd1602_arduino.jpg|frameless|600px|matrix-i2c_lcd1602_arduino]]
 +
 
 +
===Compile & Run Test Program===
 +
All the matrix modules' code samples for Arduino are maintained on GitHub - https://github.com/friendlyarm/matrix-arduino.git <br>
 +
Clone the matrix code from GitHub
 +
<syntaxhighlight lang="bash">
 +
$ git clone git://github.com/friendlyarm/matrix-arduino.git
 +
</syntaxhighlight>
 +
If this is successful a "matrix-arduino" directory will be generated, which will contain all the matrix modules' code samples.
 +
 
 +
Copy the entire directory "matrix-i2c_lcd1602" to "Arduino_IDE/libraries"
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix-arduino
 +
$ cp matrix-i2c_lcd1602 Arduino_IDE/libraies -r
 +
</syntaxhighlight>
 +
 
 +
Start Arduino IDE <br>
 +
Click on File->Examples->matrix-i2c_lcd1602->displaychar and run the test program.<br>
 +
Click on upload and run the test program.<br>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
#include <Wire.h>
 +
#include <LiquidCrystal_I2C.h>
 +
 
 +
// set the LCD address to 0x27 for a 16 chars and 2 line display
 +
LiquidCrystal_I2C lcd(0x27,16,2); 
 +
 
 +
void setup()
 +
{
 +
  lcd.init();                       
 +
  lcd.backlight();
 +
  lcd.setCursor(2, 0);
 +
  lcd.print("B&G Char LCD");
 +
  lcd.setCursor(0, 1);
 +
  lcd.println("--by FriendlyARM");
 +
}
 +
 
 +
void loop()
 +
{
 +
}
 +
</syntaxhighlight>
 +
 
 +
<!---
 +
==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
 +
 
 +
Install the git utility on a PC running Ubuntu14.04
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ sudo apt-get install git
 
$ sudo apt-get install git
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
克隆Matrix配件代码仓库
+
Clone the matrix code from GitHub
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
$ git clone git://github.com/friendlyarm/matrix.git
+
$ git clone https://github.com/friendlyarm/matrix.git
 
</syntaxhighlight>
 
</syntaxhighlight>
−
克隆完成后会得到一个matrix目录，里面存放着所有Matrix配件的代码。
+
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
  
−
==与NanoPi连接使用==
+
==Connect to NanoPi 2==
−
===准备工作===
+
===Hardware Connection===
−
在NanoPi上运行Debian系统，然后在主机PC上安装并使用相应的编译器。参考wiki：[[NanoPi/zh|NanoPi]] <br>
+
Please refer to the following connection diagram to connect the Matrix-I2C_LCD1602 to the NanoPi 2:<br>
−
注意：必须使用nanopi-v4.1.y-matrix分支编译出来的内核。<br>
+
[[File:Matrix-I2C_LCD1602_nanopi_2.jpg|frameless|600px|Matrix-I2C_LCD1602_nanopi_2]]
−
下载NanoPi内核源代码并编译
+
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-I2C_LCD1602 || NanoPi     
 +
|-
 +
|SDA    || Pin3
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|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.<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-lcd1602
 +
</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-lcd1602_result.png|frameless|600px|matrix-lcd1602_result]] <br>
 +
The LCD shows the following two lines:<br>
 +
"  B&G Char LCD"    <br>
 +
"--by FriendlyARM"
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int devFD;
 +
    if ((devFD = LCD1602Init()) == -1) {
 +
        printf("Fail to init LCD1602\n");
 +
        return -1;
 +
    }
 +
 
 +
    if (LCD1602Clear(devFD) == -1) {
 +
        printf("Fail to Clear\n");
 +
        return -1;
 +
    }
 +
    printf("clearing LCD1602\n");
 +
    sleep(1);
 +
   
 +
    if (LCD1602DispLines(devFD, "  B&G Char LCD", "--by FriendlyARM") == -1) {
 +
        printf("Fail to Display String\n");
 +
        return -1;
 +
    }
 +
    printf("displaying LCD1602\n");
 +
    LCD1602DeInit(devFD);
 +
    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">
 
<syntaxhighlight lang="bash">
 
$ git clone https://github.com/friendlyarm/linux-4.x.y.git
 
$ git clone https://github.com/friendlyarm/linux-4.x.y.git
Line 78: Line 346:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-I2C_LCD1602和NanoPi <br>
+
 
 +
Please refer to the following connection diagram to connect the Matrix-I2C_LCD1602 to the NanoPi <br>
 
[[File:matrix-i2c_lcd1602_nanopi.jpg|frameless|600px|matrix-i2c_lcd1602_nanopi]]
 
[[File:matrix-i2c_lcd1602_nanopi.jpg|frameless|600px|matrix-i2c_lcd1602_nanopi]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
Line 96: Line 365:
 
|}
 
|}
  
−
===编译测试程序===
+
===Compile Test Program===
−
进入Matrix代码仓库，切换到nanopi分支
+
Please login the matrix hub and enter the nanopi branch
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 103: Line 372:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
编译Matrix配件代码
+
Compile the matrix code
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ make CROSS_COMPILE=arm-linux- clean
 
$ make CROSS_COMPILE=arm-linux- clean
Line 109: Line 378:
 
$ make CROSS_COMPILE=arm-linux- install
 
$ make CROSS_COMPILE=arm-linux- install
 
</syntaxhighlight>
 
</syntaxhighlight>
−
注意：请确保你的主机PC当前使用的交叉编译器为NanoPi-Debian配套的arm-linux-gcc-4.4.3。<br>
+
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>
−
编译出来的库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-I2C_LCD1602对应的测试程序为matrix-lcd1602。<br>
+
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-I2C_LCD1602" module is "matrix-lcd1602".<br>
  
−
===运行测试程序===
+
===Run Test Program===
−
拷贝库文件和测试程序到NanoPi的文件系统上
+
Please copy the library files and test program to the NanoPi
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
 
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
Line 119: Line 388:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
然后启动NanoPi，在Debian的shell终端中执行如下命令运行模块Matrix-I2C_LCD1602的测试程序 <br>
+
Power on the NanoPi and run the following command in Debian's terminal <br>
−
注意：此模块并不支持热插拔，启动系统前需要确保硬件正常连接。
+
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">
 
<syntaxhighlight lang="bash">
 
$ matrix-lcd1602
 
$ matrix-lcd1602
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
int main(int argc, char ** argv)
 
int main(int argc, char ** argv)
Line 152: Line 421:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
==与Tiny4412连接使用==
+
==Connect to Tiny4412==
−
===准备工作===
+
===Preparations===
−
参考Tiny4412光盘里的《友善之臂Ubuntu使用手册》，在Tiny4412上运行UbuntuCore系统，然后在主机PC上安装并使用相应的编译器。<br>
+
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>
−
注意：只能使用Tiny4412SDK-1506的底板。
+
Note: only the Tiny4412SDK-1506 carrier board can work with this module.
  
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-I2C_LCD1602和Tiny4412 <br>
+
Please refer to the following diagram to connect the Matrix-I2C_LCD1602 to the Tiny4412 <br>
 
[[File:matrix-i2c_lcd1602_tiny4412.jpg|frameless|600px|matrix-i2c_lcd1602_tiny4412]]
 
[[File:matrix-i2c_lcd1602_tiny4412.jpg|frameless|600px|matrix-i2c_lcd1602_tiny4412]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
Line 175: Line 444:
 
|}
 
|}
  
−
===编译测试程序===
+
===Compile Test Program===
−
进入Matrix代码仓库，切换到tiny4412分支
+
Please login the Matrix hub and enter the matrix-tiny4412 branch
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 182: Line 451:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
编译matrix配件代码
+
Compile the Matrix code
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
Line 188: Line 457:
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- install
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- install
 
</syntaxhighlight>
 
</syntaxhighlight>
−
注意：请确保你的主机PC当前使用的交叉编译器为Tiny4412-UbuntuCore配套的arm-linux-gnueabihf-gcc-4.7.3。<br>
+
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>
−
编译出来的库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-I2C_LCD1602对应的测试程序为matrix-lcd1602。
+
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-I2C_LCD1602" module is "matrix-lcd1602".
  
−
===运行测试程序===
+
===Run Test Program===
−
拷贝库文件和测试程序到Tiny4412的UbuntuCore的文件系统上
+
Please copy the library files and test program to the Tiny4412
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
 
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
Line 198: Line 467:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
然后启动Tiny4412，在UbuntuCore的shell终端中执行如下命令运行模块Matrix-I2C_LCD1602的测试程序<br>
+
Power on the Tiny4412 and run the following command in UbuntuCore's terminal <br>
−
注意：此模块并不支持热插拔，启动系统前需要确保硬件正常连接。
+
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">
 
<syntaxhighlight lang="bash">
 
$ matrix-lcd1602
 
$ matrix-lcd1602
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
int main(int argc, char ** argv)
 
int main(int argc, char ** argv)
Line 231: Line 500:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
==与RaspberryPi连接使用==
+
==Connect to RaspberryPi==
  
−
==与Arduino连接使用==
+
==Connect to Arduino==
−
===准备工作===
+
===Preparations===
−
确保你的Arduino板能正常下载运行程序，参考：https://www.arduino.cc/en/Guide/HomePage <br>
+
Make sure your Arduino board can work. Here is a reference link - https://www.arduino.cc/en/Guide/HomePage <br>
−
这里我们使用的是Arduino uno板。
+
Here we tried the Arduino Uno
  
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-I2C_LCD1602和Arduino Uno <br>
+
Please refer to the following diagram to connect the Matrix-I2C_LCD1602 to the Arduino Uno <br>
 
[[File:matrix-i2c_lcd1602_arduino.jpg|frameless|600px|matrix-i2c_lcd1602_arduino]]
 
[[File:matrix-i2c_lcd1602_arduino.jpg|frameless|600px|matrix-i2c_lcd1602_arduino]]
  
−
===编译运行测试程序===
+
===Compile & Run Test Program===
−
由于arduino开发板并不运行Linux系统，所以matrix for arduino的代码由独立的仓库进行管理：git://github.com/friendlyarm/matrix-arduino.git <br>
+
All the matrix modules' code samples for Arduino are maintained on GitHub - https://github.com/friendlyarm/matrix-arduino.git <br>
−
克隆matrix-arduino代码仓库
+
Clone the matrix code from GitHub
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
$ git clone git://github.com/friendlyarm/matrix-arduino.git
+
$ git clone https://github.com/friendlyarm/matrix-arduino.git
 
</syntaxhighlight>
 
</syntaxhighlight>
−
克隆完成后会得到一个matrix-arduino目录，里面存放着所有Matrix 配件用于支持arduino的代码。
+
If this is successful a "matrix-arduino" directory will be generated, which will contain all the matrix modules' code samples.
  
−
拷贝matrix-i2c_lcd1602目录到Arduino IDE的libraries目录下
+
Please copy the entire directory "matrix-i2c_lcd1602" to "Arduino_IDE/libraries"
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix-arduino
 
$ cd matrix-arduino
Line 256: Line 525:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
启动Arduino IDE <br>
+
Start Arduino IDE <br>
−
点击File->Examples->matrix-i2c_lcd1602->displaychar，打开测试程序。 <br>
+
Click on File->Examples->matrix-i2c_lcd1602->displaychar and run the test program. <br>
−
点击upload，运行测试程序。 <br>
+
Click on upload and run the test program. <br>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
#include <Wire.h>  
 
#include <Wire.h>  
Line 282: Line 551:
 
}
 
}
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
--->
  
−
==相关资料==
+
==Resources==
 
[http://www.wvshare.com/datasheet/LCD_en_PDF/LCD1602.pdf LCD1602.pdf]  <br>
 
[http://www.wvshare.com/datasheet/LCD_en_PDF/LCD1602.pdf LCD1602.pdf]  <br>
 
[http://www.ti.com/lit/ds/symlink/pcf8574.pdf pcf8574.pdf]
 
[http://www.ti.com/lit/ds/symlink/pcf8574.pdf pcf8574.pdf]
  
 +
 +
==Update Log==
 +
===Feb-23-2016===
 +
* Added the description for "NanoPi 2 branch" in Section 4
 +
* Added Section 5: Connect to NanoPi 2
 +
===June-19-2016===
 +
* Re-organized and simplified wiki
  
 
<!--
 
<!--

Latest revision as of 14:31, 19 June 2016

查看中文

1 Introduction

I2C LCD1602
I2C LCD1602
  • The Matrix-I2C_LCD1602 is an LCD display module composed of an LCD1602 and a PCF8574 module.
  • The LCD1602 can display up to 16x2 characters. It has a parallel interface.
  • The PCF8574 provides GPIO expansion up to 8 bit for I2C. It communicates with a master via I2C and converts data from the master to parallel signals to the LCD1602 thus controls the LCD's display and back light.

2 Features

  • I2C interface, LCD display and backlight control
  • 2.54mm spacing pin
  • IIC Module PCB dimension(mm): 16 x 42
  • LCD1602 PCB dimension (mm): 36 x 80

IIC Module PCB LCD1602 PCB

  • Pin Description:
Pin Description
SDA I2C SDA
SCL I2C SCL
5V Supply Voltage 5V
GND Ground

3 Basic Device Operation

3.1 PCF8574

  • The PCF8574 has I2C parallel expansion. It has an 8bit (P0 - P7) I2C interface.
  • The PCF8574 communicates with a master via I2C. The PCF8574's chip model is PCF8574T whose address specification is as follows:

PCF8574

  • If A2 - A0 are all set to 1 the 7bit address will be 0x27(0100111). By default RW is 0 and it is in the write mode.
  • In the write mode after opening the i2c-0 device and setting up its address the master can write data to it.
  • If you need to read data from it you will need to set the module to the read mode (RW set to 1). Please refer to the PCF8574's datasheet for more details.

3.2 LCD1602

  • The connection diagram between the PCF8574 module and the LCD module is as follows:

1602

  • RS is instruction/data register selection. RW is read/write selection. E is enable signal(edge triggering). BL is back light control. D4-D7 are data bits.
  • The LCD module is controlled by four data bits through which we can send instructions to control its state. Because it has eight instruction/data bits (DB7 - DB0) when writing each instruction/data we need to write the most significant four bits DB7 - DB4 first and then the least significant four bits DB3 - DB0.
  • Note: the LCD module has 192 most commonly used characters stored in CGROM. When we write a common character e.g "A" it will directly display "A". In addition it can store up to eight user defined characters in RAM called CGRAM.

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-I2C_LCD1602_nanopi_m1

Connection Details

Matrix-I2C_LCD1602 NanoPi M1
SDA Pin3
SCL Pin5
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-I2C_LCD1602_nanopi_2

Connection Details:

Matrix-I2C_LCD1602 NanoPi 2
SDA Pin3
SCL Pin5
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-I2C_LCD1602_nanopi_m2

Connection Details:

Matrix-I2C_LCD1602 NanoPi M2
SDA Pin3
SCL Pin5
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-I2C_LCD1602_NanoPC-T2

Connection Details:

Matrix-I2C_LCD1602 NanoPC-T2
SDA Pin6
SCL Pin5
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-lcd1602

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:
matrix-lcd1602_result
The LCD will show the following two lines:
" B&G Char LCD"
"--by FriendlyARM"
If the LCD doesn't show them clearly you can adjust the resistor to highlight the characters.

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-i2c_lcd1602". Here is its source code: 

int main(int argc, char ** argv)
{
    int devFD, board;
    int i2cDev = 0;
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    if (argc == 2)
        i2cDev = atoi(argv[1]);
    if ((devFD = LCD1602Init(i2cDev)) == -1) {
        printf("Fail to init LCD1602\n");
        return -1;
    }
    if (LCD1602Clear(devFD) == -1) {
        printf("Fail to Clear\n");
    }
    printf("clearing LCD1602\n");
    sleep(1);
    if (LCD1602DispLines(devFD, "  B&G Char LCD", "--by FriendlyARM") == -1) {
        printf("Fail to Display String\n");
    }
    printf("displaying LCD1602\n");
    LCD1602DeInit(devFD);
    return 0;
}

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

7 Connect to Arduino Board

7.1 Preparations

Make sure your Arduino board can work. Here is a reference link - https://www.arduino.cc/en/Guide/HomePage
Here we tried the Arduino Uno.

7.2 Hardware Connection

Refer to the following diagram to connect the Matrix-I2C_LCD1602 to an Arduino Uno
matrix-i2c_lcd1602_arduino

7.3 Compile & Run Test Program

All the matrix modules' code samples for Arduino are maintained on GitHub - https://github.com/friendlyarm/matrix-arduino.git
Clone the matrix code from GitHub 

$ git clone git://github.com/friendlyarm/matrix-arduino.git

If this is successful a "matrix-arduino" directory will be generated, which will contain all the matrix modules' code samples.

Copy the entire directory "matrix-i2c_lcd1602" to "Arduino_IDE/libraries" 

$ cd matrix-arduino
$ cp matrix-i2c_lcd1602 Arduino_IDE/libraies -r

Start Arduino IDE
Click on File->Examples->matrix-i2c_lcd1602->displaychar and run the test program.
Click on upload and run the test program.

7.4 Code Sample

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
 
// set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27,16,2);  
 
void setup()
{
  lcd.init();                        
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print("B&G Char LCD"); 
  lcd.setCursor(0, 1);
  lcd.println("--by FriendlyARM");
}
 
void loop()
{
}


8 Resources

LCD1602.pdf
pcf8574.pdf


9 Update Log

9.1 Feb-23-2016

  • Added the description for "NanoPi 2 branch" in Section 4
  • Added Section 5: Connect to NanoPi 2

9.2 June-19-2016

  • Re-organized and simplified wiki


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