使用的是ATMEGA16芯片
功能說明:正常狀態下，8個LED不停閃爍，1602顯示normal indication指示
報警狀態下, 8個LED全發亮不閃爍，1602顯示alarm報警，只有按復位按鈕才能解除報警.
alarm狀態時，由于PB口的低3位和，1602時能，讀寫，數據指令寄存器選擇位復用，所以有點暗.
#include <iom16.h>
#include <intrinsics.h>
#define uchar unsigned char
#define uint unsigned int
#define RS1 PORTB_Bit0=1 //數據指令寄存器選擇
#define RS0 PORTB_Bit0=0
#define RW1 PORTB_Bit1=1 //讀寫選擇
#define RW0 PORTB_Bit1=0
#define EN1 PORTB_Bit2=1 //讀寫時能
#define EN0 PORTB_Bit2=0
#define DATAPORT PORTA //1602數據口
#define busy 0x80 //繁忙標志
#include "ku.h" //調用函數庫
//-------------------------------------------
uchar alarm[]={"alarm "}; //報警字符串
uchar normal[]={"normal"}; //正常字符串
uchar indication[]={"indication"};
//-------------------------函數聲明--------------
void delay_1ms(); //延時1毫秒
void delay_nms(uint n); //延時n毫秒
void wait(); //繁忙等待函數
void writedata(uchar w); //寫數據
void writecmd(uchar cmd); //寫指令
void init(); //1602初始化
void display(uchar x,uchar y,uchar *P); //顯示字符串函數
void delay(uint k) //常用延遲函數
{
uint i,j;
for(i=0;i<k;i++)
for(j=0;j<1140;j++);
}
void main()
{
DDRB=0xff; //設置PB口為輸出
PORTB=0xff;
DDRD=0x00; //中斷源設置為輸入
PORTD=0xff;
MCUCR=0x02; //中斷為下降沿
GICR=0xc0; //中斷為int0,int1
SREG=0x80; //中斷總開關
init();
while(1)
{
PORTB=0xff;
delay(300);
PORTB=0x00;
delay(300);
display(5,0,normal);
display(3,1,indication);
}
}
#pragma vector = 0x04
__interrupt void qq() //中斷產生報警
{
writecmd(0x01); //清屏
while(1)
{
display(6,0,alarm);
PORTB=0x00;
}
}
//-----------------------庫函數------------------------
void wait()
{
uchar val;
DATAPORT=0xff;
RS0;
RW1;
__no_operation();
EN1;
__no_operation(); //注:一個__no_operation();延時130ns;
__no_operation();
DDRA=0x00;
val=PINA;
while(val&busy)val=PINA;
EN0;
DDRA=0xff;
}
void writecmd(uchar w)
{
wait();
RS0;
RW0;
__no_operation();
DATAPORT=w;
__no_operation();
EN1;
__no_operation();
__no_operation();
EN0;
}
void writedata(uchar data)
{
wait();
RS1;
RW0;
__no_operation();
DATAPORT=data;
__no_operation();
EN1;
__no_operation();
__no_operation();
EN0;
}
void delay_nms(uint k)
{
uint i,j;
for(i=0;i<k;i++)
for(j=0;j<1140;j++);
}
void init()
{
delay_nms(15);
writecmd(0x38);
delay_nms(5);
writecmd(0x38);
delay_nms(5);
writecmd(0x38);
writecmd(0x80);
writecmd(0x01);
writecmd(0x06);
writecmd(0x0c);
}
void display(uchar x,uchar y,uchar *p)
{
uchar add=0x80; //1602數據指針初值
y=y&0x01;
x=x&0x0f;
if(y)add=add+0x40; //顯示第二行加數據指針加0x40
writecmd(add+x);
while(*p!='\0')
{
writedata(*p++);
}
}