Interfacing LCD with FreeSoC2

2015

Author: Salaideva thirumani

Reviewers: Mr.Sathurappan

Version: 1.0

Interfacing LCD With

FreeSoC2

# 9/3, 2nd floor, SreeLaksmi Complex, opp, to Vivekananda Park, Girinagar, Bangalore - 560085,

Email: [email protected], Phone: 080 - 26722726

Introduction:

PSoC (Programmable System on a chip) Series of Integrated Circuits from Cypress

Semiconductors is based on ARM Cortex M3 microcontroller. The FreeSoC2 is a development

platform for the PSoC series of ICs. PSoC brings together features of the programmable

devices and microcontroller-type systems on chips into one package. By placing a

programmable fabric between the peripherals and the pins, the FreeSoC2 allows any function

to be routed to any pin! Moreover, the on-board PSoC includes a number of programmable

blocks which allow the user to define arbitrary digital and analog circuits for their specific

application.

In this application note, we will see how to interface Hitachi (HD44780) LCD with FreeSoC2.

3 applications we are going to see in this Application note.

Displaying string.

Displaying LCD character set.

Displaying user defined custom fonts.

There are four parameters available in LCD configuration parameter now we see what the

functions of each parameter,

None: When this option is enabled then normal things like printing strings can be

done. But it doesnt do anything with custom character set.

Vertical Bargraph: Generate Custom character and API to manipulate the Vertical

Bargraph.

Horizontal Bargraph: Generate Custom character and API to manipulate the

horizontalBargraph.

User Defined: Creating user custom characterand use API to manipulate them.



Figure 1 Configuration parameters of CharLCD

Steps for Displaying String:

Step 1: Open PSOC creator IDE.

Figure 2 Open PSoC Creator IDE



Step 2: Create a new file from File -> New Project & select PSOC5LP design and store with desired name

Figure 3 Workbench

Step 3: Select the Character LCD form Component catalog and drag it to the schematic window.

Figure 4 Drag LCD component



Step 4: Double click the Character LCD and select None

Figure 5 LCD setup

Step 5: Then open the Cydwr file and select the port. Here selected port is P5 (6.0) port.

Figure 6 Open Schematic



Step 6: Open main.c file and type the program.

Figure 7 Open main.c

Algorithm for printing a string: Step 1: Include header file project.h Step 2: Include main () function. Step 3: Initialize the LCD by Start () function. Step 4: Set the position (row, column) for the message to bedisplayed in LCD. Step 5: Enter the string inside the PrintString () that to be displayed in the LCD. Step 6: Exit the main () function. Program for printing a string:

#include

int main()

{

LCD_Start();/*Initialize the LCD

LCD_Position(0u, 3u);/*LCD Position 0th row 4th column. */

LCD_PrintString("Tenet Tech"); /*String that is to be printed in the LCD*/

LCD_Position(1u, 0u);/*LCD Position 1st row 0th column. */

LCD_PrintString("www.tenettech.com");/*String that is to be printed in the

LCD*/

}



Step 7: Connect Micro B cable to the debugger port and then click build -> Generate application.

Figure 8 Generate Application

Step 8: Click Debug ->program or Press ctrl+F5

Figure 9 Program the Board



Step 9: Connect LCD with FreeSoC2 board.

Figure 10 Pin Connection

Figure 11 LCD with FreeSoC2



Output Image:

Figure 12 Output Image



Steps for printing LCD character set:

To print the LCD character set by means of ASCII in Hexadecimal Value(Refer image 13&14). Follow the same

steps followed in displaying strings. Thedifference is in the programonly and forget not to enableInclude ASCII

to Number Conversion Routines.

Algorithm for printing LCD character set: Step 1: Include header file project.h Step 2: Include main () function. Step 3: Initialize the LCD by Start () function. Step 4: Set the position (row, column) for the message to be displayed in LCD. Step 5: Enter the hexadecimal value for character inside the WriteData () function that to be displayed in the LCD.

Step 6: Exit the main () function.

Program:

#include

int main()

{

LCD_Start(); //initialization of LCD

LCD_Position(0U,0U); /*first row first column*/

LCD_WriteData(0x21); /*Hexadecimal code for printing ! */

LCD_Position(0U,1U); /*first row second column*/

LCD_WriteData(0x22); /*Hexadecimal code for printing */

LCD_Position(0U,2U); /*first row third column*/

LCD_WriteData(0x23); /*Hexadecimal code for printing # */

LCD_Position(0U,3U); /*first row fourth column*/

LCD_WriteData(0x24); /*Hexadecimal code for printing $ */

LCD_Position(0U,4U);

LCD_WriteData(0x25); /*Hexadecimal code for printing % */


LCD_WriteData(0x26); /*Hexadecimal code for printing & */


LCD_WriteData(0x27); /*Hexadecimal code for printing */


LCD_WriteData(0x28); /*Hexadecimal code for printing ( */


LCD_WriteData(0x29); /*Hexadecimal code for printing ) */


LCD_WriteData(0x2A); /*Hexadecimal code for printing * */




LCD_WriteData(0x2B); /*Hexadecimal code for printing + */


LCD_WriteData(0x2C); /*Hexadecimal code for printing , */


LCD_WriteData(0x2D); /*Hexadecimal code for printing - */


LCD_WriteData(0x2E); /*Hexadecimal code for printing . */


LCD_WriteData(0x2F); /*Hexadecimal code for printing / */


LCD_WriteData(0x30); /*Hexadecimal code for printing 0 */






















LCD_WriteData(0x3A); /*Hexadecimal code for printing : */


LCD_WriteData(0x3B); /*Hexadecimal code for printing ; */


LCD_WriteData(0x3C); /*Hexadecimal code for printing < */




LCD_WriteData(0x3D); /*Hexadecimal code for printing = */


LCD_WriteData(0x3E); /*Hexadecimal code for printing > */


LCD_WriteData(0x3F); /*Hexadecimal code for printing ? */

}

LCD Character set tabular column:

Figure 13 Character set

Supposeif we want to print + sign then binary value would be 00101011 and then convert to hexadecimal

value - 0x2B .If we want to print + value then in program we have to assign corresponding HEX value.



Figure 14 Binary to Hexa value

Output Image:

Figure 15 Output with 32 characters set.



Steps for Printing user defined custom set in LCD:

Enable the User defined in configure LCD dialog box and draw the pattern we want to print in LCD and then

follow the same steps followed in printing strings experiment, the difference will be in the program and

configuration of CharLCD.

Figure 16 Configure User Defined

Algorithm for printing LCD character set: Step 1: Open the configure LCD dialog box and enable user defined option. Step 2:Draw the custom fonts (Custom 0, 1, 2, 3, 4, 5, 6, 7) by selecting blocks in Custom Character Editor. Step 3: Include header file project.h Step 4:Initialize the custom fonts section by commandextern uint8 constLCD_customFonts [ ]. Step 5:Include main () function. Step 6:Initialize the LCD by Start () function. Step 7:Load custom Fonts by LoadCustomFonts (defined name _customFonts) Step 8:Set the position (row, column) for the message to be displayed in LCD. Step 9: Enter the string that is to be displayed in the LCD by PrintString() function. Step10:Display the custom fonts that is created in the step 2 by using PutChar (defined name_CUSTOM_NO) Step 11:Exit the main () function.



Program for printing custom set (*draw the custom font in Configure char LCD): #include

externuint8constCYCODE LCD_customFonts[]; /*initialization for

enabling custom font*/

int main()

{

LCD_Start();

LCD_LoadCustomFonts(LCD_customFonts);

for(;;) /*infinite loop*/

{

LCD_Position(1u,3u); /* set the LCD position in 2nd row 3rd column*/

LCD_PrintString("Tenet Tech"); /*Input the string we want to print*/


LCD_PutChar(LCD_CUSTOM_0); /*Print the char which is drawn in the custom

font 0*/


LCD_PutChar(LCD_CUSTOM_1); /*Print the char which is drawn in the custom

font 1*/


LCD_PutChar(LCD_CUSTOM_2);/*Print the char which is drawn in the custom

font 2*/

LCD_Position(1u,3u);/*2nd row 3rd column */

LCD_PrintString("Tenet Tech");

}}

Output image:

Figure 17 Output Custom Fonts Displayed in the Top Row



For product link:

1. http://www.tenettech.com/product/7241/freesoc2-development-board-psoc5lp

2. http://www.tenettech.com/product/2442/16-x-2-character-lcd-display-with-backlight-

jhd162a-green

3. http://www.tenettech.com/product/2609/basic-breadboard

4. http://www.tenettech.com/product/2277/jumper-wires-ff-pack-of-10

For more information please visit: www.tenettech.com

For technical query please send an e-mail: [email protected]

Documents

Interfacing LCD with FreeSoC2