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/*******************************************************************************************************
* LCD PROGRAM *
********************************************************************************************************
* HEADER DECLARATIONS *
*******************************************************************************************************/
#include<lpc21xx.h>
#define RS 0x00020000 /* 17th pin RS */
#define RW 0X00040000 /* 18th pin R/W */
#define EN 0X00080000 /* 19th pin EN */
#define CLR 0X00FE0000
/*******************************************************************************************************
* Function : Delay
*
* Description : command for Delay
*
* Parameter : x, the value for delay
*******************************************************************************************************/
int Delay(unsigned int x)
{
x=x*12000;
while(x!=0){
x--;
}
return 0;
}
/*******************************************************************************************************
* Function : Lcd_Command
*
* Description : command for lcd
*
* Parameter : command, address value
********************************************************************************************************/
void Lcd_Command(char command)
{
int Temp;
IO1CLR = CLR; /* Clear ALL 16-23 Pins */
IO1SET = EN; /* SET 19th Pin [EN] */
IO1CLR = RS; /* Clear 17th Pin [RS] */
IO1CLR = RW; /* Clear 18th Pin [R/W] */
Temp = (command & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] & [4-7]
Shifted To [20-23] */
IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000
[Only '3' Is in [20-23]pins */
Delay(2); /* Minimum Delay Time */
IO1CLR = EN; /* ENABLE High-Low Transition */
}
/********************************************************************************************************
* Function : Lcd_Command1
*
* Description : command for lcd
*
* Parameter : command1, address value
********************************************************************************************************/
void Lcd_Command1(char command1)
{
int Temp;
IO1CLR = CLR; /* Clear ALL 16-23 Pins */
IO1SET = EN; /* SET 19th Pin [EN] */
IO1CLR = RS; /* Clear 17th Pin [RS] */
IO1CLR = RW; /* Clear 18th Pin [R/W] */
Temp = (command1 & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] &
[4-7] Shifted To [20-23] */
IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000
[Only '3' Is in [20-23]pins */
Delay(2); /* Minimum DelayTime */
IO1CLR = EN; /* ENABLE High-Low Transition */
IO1CLR = CLR; /* Clear ALL 16-23 Pins */
IO1SET = EN; /* SET 19th Pin [EN] */
IO1CLR = RW; /* Clear 17th Pin [RS] */
IO1CLR = RS; /* Clear 18th Pin [R/W] */
Temp = (command1 & 0x0F) << 20; /* Lower Nibble [0-3] Shifted To [20-23] &
[0-3] Shifted To [20-23] */
IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00800000[Shifted] = 0X00880000
[Only '8' Is in [20-23]pins */
Delay(2); /* Minimum Delay Time */
IO1CLR = EN; /* ENABLE High-Low Transition */
}
/*******************************************************************************************************
* Function : Lcd_Data
*
* Description : display command for lcd
*
* Parameter : data, single data
*******************************************************************************************************/
void Lcd_Data(char data)
{
int Temp;
IO1CLR = CLR; /* Clear ALL 16-23 Pins */
IO1SET = EN; /* SET 19th Pin [EN] */
IO1CLR = RW; /* Clear 18th Pin [R/W] */
IO1SET = RS; /* Clear 17th Pin [RS] */
Temp = (data & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] & [4-7]
Shifted To [20-23] */
IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000
[Only '3' Is in [20-23]pins */
Delay(2); /* Minimum DelayTime */
IO1CLR = EN; /* ENABLE High-Low Transition */
IO1CLR = CLR; /* Clear ALL 16-23 Pins */
IO1SET = EN; /* SET 19th Pin [EN] */
IO1CLR = RW; /* Clear 18th Pin [R/W] */
IO1SET = RS; /* Clear 17th Pin [RS] */
Temp = (data & 0x0F)<<20; /* Lower Nibble [0-3] Shifted To [20-23] &
[0-3] Shifted To [20-23] */
IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00800000[Shifted] = 0X00880000
[Only '8' Is in [20-23]pins */
Delay(2); /* Minimum DelayTime */
IO1CLR = EN; /* ENABLE High-Low Transition */
}
/*******************************************************************************************************
* Function : lCD_string
*
* Description : display group of data
*
* Parameter : dat, group of data
*******************************************************************************************************/
void Lcd_String(unsigned char *dat)
{
while(*dat!='\0')
{
Lcd_Data(*dat);
dat++;
}
}
/******************************************************************************************************
* Function : Lcd_Init
*
* Description : Funtion for initialize LCD to display data
*
* Parameter : None
********************************************************************************************************/
void Lcd_Init(void)
{
Delay(15); /* Delay (1.5ms) */
Lcd_Command(0x30); /* Single line enable(2X16) */
Delay(10); /* Delay (10us) */
Lcd_Command(0x30); /* Single line enable(2X16) */
Delay(5); /* Delay (0.5ms) */
Lcd_Command(0x30); /* Single line enable(2X16) */
Lcd_Command(0x20); /* 4-bit Mode Enable */
Lcd_Command1(0x28); /* Double line enable (2X16) */
Lcd_Command1(0x01); /* Clear LCD */
Lcd_Command1(0x06); /* Automatic increment */
Lcd_Command1(0x0C); /* Cursor OFF /Display ON */
}
/********************************************************************************************************
* Function : PORT INITIALIZATION
*
* Description : Funtion for initialize ports
*
* Parameter : None
********************************************************************************************************/
void Port_Initial(void)
{
IO1DIR = 0x00FE0000; /* 17-23 Pins As Output for LCD */
IO0DIR = 0x00000000;
PINSEL0 = 0x00000000;
PINSEL1 = 0x05000000;
PINSEL2 = 0x00000000;
}
/********************************************************************************************************
* CODE AREA *
********************************************************************************************************/
int main()
{
Port_Initial(); /* Initialize direction & pinsel of ports */
Lcd_Init(); /* LCD initialization */
Lcd_String(" RhydoLABZ "); /* LCD display */
Lcd_Command1(0xC0); /* LCD Location (0xC0) */
Lcd_String(" Cochin "); /* LCD display */
while(1);
}
/********************************************END********************************************************/
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OUTPUT
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