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EK-TM4C123GXL: I there any example to interface the LCD to the controller?

Omkar Dixit
Intellectual 720 points

Part Number: EK-TM4C123GXL

I'm working on the TM4C123GXL trying to interface the 40x2  "NHD-0240AZ-FL-YBW" LCD. For that I was searching for the lcd interfacing example in the software development kit but  I haven't find any. How can I find the same so that interfacing will become easy for me.

Regards,

Omkar Dixit

  • 0
    TI__Guru 72500 points

    I don't have any examples for that LCD, but I do have examples for interfacing the EK-TM4C123GXL to a Kentec QVGA boosterpack. The examples are in TivaWare,  C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c123gxl-boostxl-kentec-s1

  • 0 in reply to Bob Crosby
    Intellectual 720 points

    Hi

    Bob

    Thanks for the reply I hope I will get opportunity to interface TFT Display in future and if I get I will definitely go through the example you shared.

    Regards,

    Omkar Dixit

  • 0
    Intellectual 720 points

    This code worked for me

    /*************************************************************lcd.c*********************************************************/
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "lcdinit.h"
#include "stdio.h"
#include "TM4C123.h"                    // Device header
#include "arm_math.h"                   // ARM::CMSIS:DSP

void DelayMilis(unsigned long ulMilliSeconds)
{
	unsigned long i = 0, j = 0;
	
	for(i = 0;i < ulMilliSeconds;i++)
	{
		for(j = 0;j < 2000;j++);
	}
}

void 
LCDCommand(unsigned char cmd)
{

  unsigned char lcmd1,lcmd2;
  lcmd1=((cmd&0xF0)>>4);
  RS_LO;
  DATA_PORT(lcmd1);
  EN_HI;
  EN_LO;
  lcmd2=((cmd&0x0F));
  
  DATA_PORT(lcmd2);
  RS_LO;
  EN_HI;
  EN_LO;
  
}

void 
LCDPutChar(unsigned char dat)
{
    unsigned char ld1,ld2;
    ld1=((dat&0xF0)>>4);
    RS_HI;
    
    DATA_PORT(ld1);
    EN_HI;
    EN_LO;
    ld2=((dat&0x0F));
    RS_HI;
    
    DATA_PORT(ld2);
    EN_HI;
    EN_LO;
    
}

void 
LCDInit(void)
{   
    LCDCommand (0x02);
       DelayMilis(5);
    LCDCommand (0x28);
       DelayMilis(5);
    LCDCommand (0x0E);
       DelayMilis(5);
    LCDCommand (0x01);
       DelayMilis(5);
//    LCDCommand (0x06);
        DelayMilis(5);
    LCDCommand (DISPLAY);  
       DelayMilis(5);
    LCDCommand (CURSOR_ON_OFF);
       DelayMilis(5);
//    LCDCommand(CURSOR_BLINK);
	  DelayMilis(5);
//	  LCDCommand(BLOCK_CURSOR_BLINK);	
	  DelayMilis(5);
    LCDCommand (CLEAR_DISPLAY);
       DelayMilis(5);
    LCDCommand(INCR_ADDRESS_SHIFT_CURSOR_WITH_EACHCHARACTER_RIGHT); 
       DelayMilis(5);
} 

void LCDWriteString(unsigned char *string)
{
  while(*string)
  {

    LCDPutChar(*string++);
    DelayMilis(3);
  }
}

void LCDWriteString1(unsigned char *string, unsigned char ucLineNumber, unsigned char ucPosition)
{
	LCDCommand(ucLineNumber+ucPosition);
	DelayMilis(5);
	while(*string)
  {

    LCDPutChar(*string++);
    DelayMilis(1);
  }
}

void LCDRst(void)
{   
    LCDCommand(CURSOR_AT_LINE_2 );
    DelayMilis(50);
}

/*************************************************************lcd.h*********************************************************/
#ifndef _LCD_H
  #define _LCD_H
  #define SLAVE_ADDRESS         0x68
  #define CURSOR_AT_LINE_1      0x80
  #define CURSOR_AT_LINE_2      0xC0
  #define CURSOR_AT_LINE_3      0x94   // To be used only
  #define CURSOR_AT_LINE_4      0xd4   // for a four line LCD
  #define DISPLAY               0x28
  #define LCDINITWITHSMALLCHARS 0x20 
  #define CURSOR_OFF            0x08
  #define BLOCK_CURSOR_BLINK    0x0F
  #define CURSOR_BLINK          0x0E
  #define CURSOR_ON_OFF         0x0C
  #define CURSOR_SHIFT_LEFT     0x10
  #define CURSOR_SHIFT_RIGHT    0x14
  #define CLEAR_DISPLAY         0x01
  #define CURSOR_AT_HOME        0x02
  #define INCR_ADDRESS_SHIFT_CURSOR_WITH_EACHCHARACTER_RIGHT    0x06
 
 
 	#define DelayTime_LCD_CMD 0X00001FFF
	#define DelayTime_LCD_INFO_L 0x00FFFFFF
	#define DelayTime_LCD_INFO_M 0x007FFFFF	
	#define DelayTime_LCD_INFO_S 0x003FFFFF

  #define EN_HI                 GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_5, GPIO_PIN_5)
  #define EN_LO                 GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_5, 0x00)
  #define RS_HI                 GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_4, GPIO_PIN_4)
  #define RS_LO                 GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_4, 0x00)
  #define DATA_PORT(data)				GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_3 | GPIO_PIN_2 | GPIO_PIN_1 | GPIO_PIN_0, data);						 

  extern void LCDCommand(unsigned char cmd);
  extern void LCDPutChar(unsigned char dat);
  extern void LCDInit(void);
  extern void LCDWriteString(unsigned char *string);
	extern void LCDWriteString1(unsigned char *string, unsigned char ucLineNumber, unsigned char ucPosition);
  extern void DelayMilis(unsigned long);
  
  
#endif