AVR M16 Experiment 2 LCD1602 Display-EEWORLD

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/**********************************************************************
* File name: main.c
* Program author: kidcao1987
* Program version: V1.0
* Function description: Install LCD1602 and use it to display on LCD1602. It is recommended to connect an external power supply.
"This a LCD demo!
www.CEPARK.com
Keep moving!!
By:kicao1987"
* Compiler: WinAVR-20090313
* Chip: ATmega16, external 11.0592MHZ crystal oscillator
* Technical support: http://bbs.cepark.com
***********************************************************************/
#include
#include

#define SETLCD1602RS PORTA |= (1<#define CLRLCD1602RS PORTA &= ~(1<#define SETLCD1602RW PORTA |= (1<#define CLRLCD1602RW PORTA &= ~(1<#define SETLCD1602EN PORTA |= (1<#define CLRLCD1602EN PORTA &= ~(1<
unsigned char const ucString1[]={"This a LCD demo!"};
unsigned char const ucString2[]={" www.CEPARK.com "};
unsigned char const ucString3[]={" Keep moving!! "};
unsigned char const ucString4[]={" By:kicao1987 "};

void LCD1602BusyCheck(void); //Busy detection
void LCD1602WriteOperation(unsigned char,unsigned char); //Write operation
void LCD1602Init(void); //Initialization function
void LCD1602MoveToPosition(unsigned char,unsigned char); //Locate to the specified position
void LCD1602PrintString(unsigned char const * str); //Output a string of characters

int main(void)
{
PORTA = 0xFF;
DDRA = 0xFF;
PORTB = 0xFF;
DDRB = 0xFF;
LCD1602Init();
while(1)
{
LCD1602MoveToPosition(0,0);
LCD1602PrintString(ucString1);
LCD1602MoveToPosition(1,0);
LCD1602PrintString(ucString2);
_delay_ms(5000); //Delay 5 milliseconds
LCD1602MoveToPosition(0,0);
LCD1602PrintString(ucString3);
LCD1602MoveToPosition(1,0); //Delay 5 milliseconds
LCD1602PrintString(ucString4);
_delay_ms(5000);
}
}

//Busy detection
void LCD1602BusyCheck(void)
{
unsigned char i = 254;
DDRB = 0x00; //Set the highest bit to input
CLRLCD1602RS;
SETLCD1602RW;
SETLCD1602EN;
_delay_us(5);
while((i--) && (PINB & 0x80));
DDRB = 0xff;
_delay_us(5);
CLRLCD1602EN;
_delay_us(5);
}

//Write operation
void LCD1602WriteOperation(unsigned char Data,unsigned char ComOrData)
{
LCD1602BusyCheck(); //ComOrData=0 is command, 1 is data

if(0 == ComOrData)
CLRLCD1602RS;
else if(1 == ComOrData)
SETLCD1602RS;
CLRLCD1602RW;
SETLCD1602EN;
_delay_us(5);
PORTB = Data;
_delay_us(5);
CLRLCD1602EN;
_delay_us(100);
}

void LCD1602Init(void) //Initialization
{
LCD1602WriteOperation(0x38,0);
_delay_ms(15);
LCD1602WriteOperation(0x38,0);
_delay_ms(5);
LCD1602WriteOperation(0x38,0);
_delay_ms(5);
LCD1602WriteOperation(0x38,0);
_delay_ms(5);

LCD1602WriteOperation( 0x0c,0);
_delay_ms(1);
LCD1602WriteOperation(0x06,0);
_delay_ms(1);
LCD1602WriteOperation(0x01,0);
_delay_ms(1);
}

void LCD1602MoveToPosition(unsigned char ucx,unsigned char ucy)
{
if(0 == ucx) //First line
{
LCD1602WriteOperation(0x80 + ucy,0); //Yth column
}
if(1 == ucx) //Second row
{
LCD1602WriteOperation(0xC0 + ucy,0); //第Y列
}
}

void LCD1602PrintString(unsigned char const * str)
{
while(*str != '')
{
LCD1602WriteOperation(*str,1);
str++;
}
}

Video address: http://v.youku.com/v_show/id_XMTYxNDg1MDQ0.html

Keywords：AVR M16 Reference address：AVR M16 Experiment 2 LCD1602 Display

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