4D LCD Interface With MyRIO

LCD Interface with myRIO

Objective

- Make user interface for myRIO

- Send and receive string commands or results to/from proprietary software via serial

communication

- Make example VI for controlling meter object, controlling scope object and reading slider object

on the LCD display

Hardware List

NI-myRIO

SK-32PTU (Starter Kit)

This item includes the following:

- uLCD-32PTU Display Module

- 2GB microSD Card

- uUSB-PA5 Programming Adaptor

- 150mm 5 way Female-Female jumper cable, for quick connection to another device

or breadboard

- 5 way Male-Male adaptor (for converting the Female-Female cable to be Male-

Female)

uUSB-PA5 Programming Adaptor

Cable jumper

Software List

LabVIEW 2013 or later

Labview Real Time 2013

Labview FPGA 2013

Labview myRIO Driver (Included in myRIO DVD 1)

Workshop Genie 4.0

Hardware Setup

Debugging/Development Mode using PC

Figure 1. Connection uLCD 32PTU to PC

Stand alone using NI myRIO

4D Systems

uLCD 32PTU

NI myRIO Figure 2. Connection uLCD 32PTU to NI myRIO

Software Setup

Installing Workshop Software

Installing Workshop.

1. Double-click WORKSHOP4 INSTALLER.4.1.0.28

2. Click Next

3. In License Agreement section, click I Agree.

4. In Choose Install Location section, click Next. It will require around 310 MB harddisk space

5. Select program folder, click Next

6. In next section, click next to begin installation

7. After the installation is completed, click Close.

8. Youve now installed Workshop 4D Systems

Create user Interface in uLCD 32 PTU

1. Open Workshop IDE

2. Click New, choose product uLCD-32PTU

3. uLCD 32PTU use only USB Programming Cable from 4D Systems. Be careful when using USB

UART from another brand instead of 4D systems or warranty will be void.

4. Choose environment, click ViSi Genie arrow. We will use ViSi Genie environment to create user

interface in LCD

5. We will create user interface in LCD consisting,

a. 2 objects of Meter

b. 2 objects of Slider

c. 2 objects of Scopes

As shown below,

6. In ViSi Genie Environment, Click tab Gauges and click Meter icon, click on the blank LCD panel to

place Meter icon on LCD

Place all object as shown in picture step 5

7. You can modify the properties of object in Workshop ViSi Genie. For example, you can set

minimum and maximum value of Meter objects (default: minimum 0, maximum 100). In this

documentation, we will leave all objects properties as default

8. Save the Visi Genie Project

Downloading project into SD card

9. Prepare and insert SD Card from uLCD 32PTU into PC

10. Click Build Copy/Load

11. After finish build, it will ask which drive to use. Select the drive which uSD card is inserted

12. Reinsert uSD card into uLCD 32PTU

13. Turn on the LCD by connecting power supply 5V and ground to pin serial in LCD

14. After turning on, you should see the display of meter that you build in ViSi Genie in the LCD

screen

Debugging using workshop GTX

We can check the command for controlling using GTX

1. Connect uLCD 32PTU to PC using uUSB-PA5 Programming Adaptor as shown in figure 1

2. Start Workshop and open file project which is used in uLCD

3. Select Tools > GTX

4. The display should shows control of objects we have created on this project,

5. We can send the serial command to Set value to object or we can send serial command to

Query to get the value of object.

6. The command is represented as hexadecimal string. Once the command is sent, uLCd will

response.

Command from PC is represented in green, response from uLCD is represented in red

7. We can see the change in uLCD hardware s we send the command

Development using Labview and NI-VISA

Sending serial command from PC to uLCD 32PTU can be done by using Labview and NI VISA. Here is

an example about how to write program to send command to Set meter value using NI VISA

1. Serial command to uLCD 32PTU consists of several parameter , refer to documentation ViSi-

Genie-Reference-Manual-REV1.pdf for more detailed command

- Byte 1 : Command write

- Byte 2 : Object ID

- Byte 3 : Object Index

- Byte 4 : MSB

- Byte 5 : LSB

- Byte 6 : Checksum CRC

2. For meter write command, we can set byte 1 and byte 2 as a constant (0110)

3. Byte 3,4,5 we can derive the value from parameter in control

4. Checksum CRC is generated by calculating and XOR-ing byte 1 to byte 5

5. The representation of byte in serial command is converted into hexadecimal string

6. Use Visa Write function to send the command from PC to uLCD

7. Use Visa Read function to read response drom uLCD.

8. Use the same method for another object (Slider, scope) and save it as a subVI

9. Open Interface4d project under LCD VISA folder. Open Main.vi

10. When program below executes, it reads slider value, get the value and use the value for

writing meter and writing scope

11. Use VISA Configure Serial to set the configuration of serial setting and resource name

12. Use Visa Close to end device session

13. When the VI is running, we can control the meter and scope by moving the slider.

Implementation in NI myRIO

We will implement the serial command for uLCD 32PTU using myRIO. But we will use digital input

output as port Tx and Rx in serial communication. Because we cannot use NI VISA, we will build

serial communication protocol in myRIO FPGA connected to I/O digital input output.

Installing Software in NI myRIO

1. Ensure that the following software is installed in the NI myRIO:

2. By default the software NI myRIO 13.0.1 is already installed. But in case of it is deleted because

of formatted after previous use. You can find the software in NI myRIO CD

Implement Serial Communication on Digital Input and Output of NI myRIO

In this step, we will implement serial communication into FPGA into NI myRIO. Everytime we modify

the FPGA vi we must synthesize the code into gated level code which stored in bitfile.

14. Open RS232 LCD myRIO lvproj project file

15. Right click NI myRIO and click Connect

16. Verify the code which implemented in FPGA, click FPGA Target, and open FPGA Main block

Diagram.

We can see the Digital Input Output port used for serial Tx (DIO0) and Rx (DIO4). You can

change for desired your settings.

17. Expand Chassis (myRIO-1990) , click FPGA Target, open Build Specification

18. Right Click FPGA Main, click Rebuild. Choose compile server, select Use the local compile

server. Wait for Xilinx compiler to synthesize the gate level.

19. The synthesized gate is saved into file image bitfile with extension *.lvbitx in FPGA bitfiles

folder.

Implement bitfile into Realtime VI

We already made gated level configuration of FGPA into bitfile. We will implement this code in

serial communication. As we know, the common function serial communication is

- Serial Init

- Serial Read

- Serial Write

- Serial Close

The function is implemented in folder Real Time VI. And because we made change in FPGA code

and made new FPGA bitfiles, we need to modify the FPGA reference on those real time VI. This

step is

20. Open LV Serial Init VI, double click FPGA Main terminal

21. Choose Bitfile and browse the bitfile code we already made before, and click the bind FPGA

host reference to type definition. And save it on FPGAref.ctl. save the VI

22. Check all other VI (LV Serial Close, Read, Write) and see whether any broken wire.

23. If there is any broken wire, use FPGA ref.ctl as a control of FPGA Interface in and as an

indicator of FPGA Interface out

Using Application to read Slider, write Meter and write Scope

To read data from LCD and write data to LCD. The program is using serial communication. In this

documentation, the command for reading slider object, writing meter object and writing scope

object is presented. For specific command and more object command, refer to documentation ViSi-

Genie-Reference-Manual-REV1.pdf

Using Slider Read

This VI is used for reading data.

Input

- FPGA Interface In : Input of FPGA reference

- Object Index : Object ID to differ several object

- Error In : error cluster input

Output

- FPGA Interface Out : Output of FPGA reference

- Value Read : Value read from slider in integer

- Error Out : error cluster output

Using Meter Read

Input




Output



Using Scope Write

Input




Output



Guide to write application of specific object in LCD 32PTU

1. Refer to Documentation Genie-Reference-Manual-REV1.pdf for command list of Visi Genie

command.

2. The VI of specific command of an object must consists of serial write part and serial read

part

Serial Write

Serial Read

- Command

- Object ID

- Parameter- CRC

- Response

3. Refer to this table (also available on Visi genie Documentation) for Serial write command

4. The command is represented as Hexadecimal of String.

5. Here is an example of application design of Slider Read.

Command : 4 byte : 1x00 , 1x04 , 1 byte object index, 1 byte checksum CRC

Response : 6 byte : 1x05, 1x10 , 1 byte MSB, 1 byte LSB , 1 byte checksum CRC

6. Here is an example of application design of Meter Write

Command : 6 byte : 1x01 , 1x10 , 1 byte MSB , 1 byte LSB , 1 byte checksum CRC

Response : 1 byte : 1x06 if success or 1x15 if fail

Implementing application with Labview real time

In this step, we will implement the VI in NI myRIO and use Labview in PC for debugging and

development purpose.

1. Setup the hardware configuration as shown in Hardware Section.

Warning : Use only USB UART TTL of 4D system (TTL 0 5V) for connection. Dont connect it to serial

port of external device (TTL 0 - > 12 V)

2. Open file CheckSLiderMeter.vi

3. This example shows the process of reading value in slide and then writing the value into

Meter and Scope. You can modify the application, for example showing sinusoidal wave in

Scope, or randomly generating number and show it in Meter objects.

4. The serial setting of LCD 32PTU is as below,

o Baud rate : 9600 bps

o Data bits : 8

o Parity : None

o Stop bits : 1 bit

o Invert Polarity : True

5. Right Click on CheckSliderMeter and select Deploy

6. Run the VI.

7. Try to change the value of Slider in LCD, see what happen to Meter and Scope objects.The

Meter and Scope should follow the movement of Slider.

8. Click stop button in PC Front Panel to stop the program

4D LCD Interface With MyRIO

Documents

Transcript of 4D LCD Interface With MyRIO