lcd1602.h

用AVR及1602LCD在PROTEUS环境下仿真

/**************************************************************************
  
                   		THE 1602 CHAR LCD LIB
  
             		COPYRIGHT (c)   2007 BY zyg.
                       		--  ALL RIGHTS RESERVED  --
  
   File Name:       LCD.h
   Author:          zhuyiguo
   Created:         2007/4/23
   Modified:		NO
   Revision: 		1.0
  
***************************************************************************/

#ifndef LCD_CHAR_1602_2007_4_23
#define LCD_CHAR_1602_2007_4_23
//控制脚定义
#define RS_D asm("sbi 0x15,2")
#define RS_I asm("cbi 0x15,2")
#define	RW_R asm("sbi 0x15,3")
#define RW_W asm("cbi 0x15,3")
#define E_1 asm("sbi 0x15,4")
#define E_0 asm("cbi 0x15,4")

//**************************************************************************
//ATMEGA16初始化
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x10; //m103 output only
 DDRC  = 0x1C;
 PORTD = 0x00;
 DDRD  = 0x00;
}
//******************************************************************

//Watchdog initialize
// prescale: 2048K 
void watchdog_init(void)
{
 WDR(); //this prevents a timout on enabling
 WDTCR = 0x0f; //WATCHDOG ENABLED - dont forget to issue WDRs
}
//******************************************************************
//TIMER1 initialize - prescale:256
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 500mSec
// actual value: 500.000mSec (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0xC2; //setup
 TCNT1L = 0xF7;
 //OCR1AH = 0x3D;
 //OCR1AL = 0x09;
 //OCR1BH = 0x3D;
 //OCR1BL = 0x09;
 //OCR1CH = $OCR1CH$;
 //OCR1CL = $OCR1CL$;
 //ICR1H  = 0x3D;
 //ICR1L  = 0x09;
 TCCR1A = 0x00;
 TCCR1B = 0x04; //start Timer
}
//******************************************************************
//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 watchdog_init();
 timer1_init();

 MCUCR = 0x00;
 GICR  = 0xc0;//interrupt int0,int1 enable
 TIMSK = 0x04; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}
//******************************************************************
//延时函数
void delay_us(int time)//微妙级延时函数
{
 WDR();
 while(time--)
 {
  NOP();NOP();NOP();NOP();NOP();NOP();NOP();NOP();
 }
}
void delay_ms(int time)//毫秒级延时函数
{
 while(time--)
  {
   delay_us(1000);
  }
}

//********************************************************************
//读LCD1602状态字
unsigned char lcd_read_code(void)
{
 unsigned char code;
 DDRA=0x00;
 RS_I;
 RW_R;
 E_1;
 delay_ms(1);
 code=PINA;
 E_0;
 RW_W; 
 DDRA=0xff;
 return code;
}

//*******************************************************************
//判断LCD是否为忙状态
void judgebusy(void)
{
 //unsigned char t;
 //t=lcd_read_code();
 while(((lcd_read_code())&0x80)==0x80)
 {
  //t=lcd_read_code();
  //if((t&0x80)!=0x80) break;
  
 }
}

//写显示数据*******************************************************************
void lcd_write_data(unsigned char data)
{
 WDR();
 DDRA=0xff;
 RS_D;
 delay_us(1);
 RW_W;
 delay_us(1);
 E_1;
 //judgebusy();
 delay_ms(1);
 PORTA=data;
 E_0;
 delay_us(1);
 //E_0;
 RW_R;
 DDRA=0x00;
 WDR();
}

//写状态字********************************************************************
void lcd_write_code(unsigned char code)
{
 WDR();
 DDRA=0xff;
 RS_I;
 delay_us(1);
 RW_W;
 delay_us(1);
 E_1;
 //judgebusy();
 delay_ms(1);
 
 PORTA=code;
 E_0;
 delay_us(1);
 //E_0;
 RW_R;
 DDRA=0x00;
 WDR();
}

//显示字符串******************************************************************
void Print(unsigned char *str)
{
	while(*str!='\0')
	{   
	    WDR();
		lcd_write_data(*str);
		//delay_ms(100);
		str++;
	}
}

//显示位置************************************************************************
void GotoXY(unsigned char x,unsigned char y)
{
	if(y==0)
		lcd_write_code(0x80|x);
	if(y==1)
		lcd_write_code(0x80|(x-0x40));
}

void lcd_init(void)
{
 WDR();
 delay_ms(400);//等待LCD稳定
 E_1;
 //lcd_write_code(0x01);
 delay_ms(15);
 lcd_write_code(0x38);//显示模式:8位数据端口,2行显示,5*7点阵
 delay_ms(5);
 lcd_write_code(0x38);
 delay_ms(5);
 lcd_write_code(0x38);
 delay_ms(5);
 lcd_write_code(0x0C);//开启显示, 无光标
 delay_ms(5);
 lcd_write_code(0x06);//读写一个字符后光标加1,地址加1
 delay_ms(5);
 lcd_write_code(0x01);//清屏:数据指针清0,显示清0
 delay_ms(5);
 lcd_write_code(0X02);//数据指针清0
 WDR();
}
#endif