timer1leddisplay.c

51单片机时钟程序

//ICC-AVR application builder : 2007-8-1 21:29:13
// Target : M16
// Crystal: 4.0000Mhz

#include <iom16v.h>
#include <macros.h>

#define key_hour    PD0     
#define key_min     PD1     
#define key_sec     PD2   
#define key_clr     PD3
/*共阴数码管七段码*/
const led_tab[10]={    
        0x3F,/*0*/
        0x06,/*1*/
        0x5B,/*2*/
        0x4F,/*3*/
        0x66,/*4*/
        0x6D,/*5*/
        0x7D,/*6*/
        0x07,/*7*/
        0x7F,/*8*/
        0x6F,/*9*/
		};
unsigned char second,minute,hour;	
unsigned char time_group[6];

void delay_ms(unsigned char);
void display(void);
void set_detect(void);

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0xFF;
 PORTB = 0x00;
 DDRB  = 0xFF;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0xff;
 DDRD  = 0x00;
}

//TIMER1 initialize - prescale:64
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 1Hz
// actual value:  1.000Hz (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x0B; //setup
 TCNT1L = 0xDC;

 TCCR1A = 0x00;
 TCCR1B = 0x03; //start Timer
}

#pragma interrupt_handler timer1_ovf_isr:iv_TIM1_OVF
void timer1_ovf_isr(void)
{
 //TIMER1 has overflowed
 TCNT1H = 0x0B; //reload counter high value
 TCNT1L = 0xDC; //reload counter low value
 second++;
 if(second==60)
 {
  second=0x00;
  minute++;
  if(minute==60)
  {
   minute=0x00;
   hour++;
   if(hour=24)
   {
   hour=0x00;
   }
  }
 }
}

/*数据拆分程序*/
void data_split(void)  
{
 time_group[0]=second%10;
 time_group[1]=second/10;
 time_group[2]=minute%10;
 time_group[3]=minute/10;
 time_group[4]=hour%10;
 time_group[5]=hour/10;
}

/*时间设置检测*/
void set_detect(void)   
{
  if(!(PIND&(1<<key_clr))) //清零键检测
  {
   delay_ms(10);
   if(!(PIND&(1<<key_clr)))
   {
    hour=0x00;
	minute=0x00;
	second=0x00;
   }
  }
  

  if(!(PIND&(1<<key_hour)))  //小时调整键检测
  {
   delay_ms(10);
   if(!(PIND&(1<<key_hour)))
   {
    while(!(PIND&(1<<key_hour)))
	{
	 display();
	}
	hour++;
	if(hour==24)
	{
	 hour=0;
	}
   }
  }
  
  if(!(PIND&(1<<key_min)))//分钟调整键检测
  {
   delay_ms(10);
   if(!(PIND&(1<<key_min)))
   {
    while(!(PIND&(1<<key_min)))
	{
	 display();
	}
	minute++;
	if(minute==60)
	{
	 minute=0;
	}
   }
  }
   if(!(PIND&(1<<key_sec)))//秒调整键检测
  {
   delay_ms(10);
   if(!(PIND&(1<<key_sec)))
   {
    while(!(PIND&(1<<key_sec)))
	{
	 display();
	}
	second++;
	if(second==60)
	{
	 second=0;
	}
   }
  }
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer1_init();
 hour=0x00;
 minute=0x00;
 second=0x00;
 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x04; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

/*动态扫描显示程序*/
void display()  
{
  unsigned char i,led_sel;
  led_sel=0xdf;
  for(i=0;i<6;i++)
  {
   PORTA=led_tab[time_group[i]];
   PORTB=led_sel;
   led_sel=(led_sel>>1)+0x80;
   delay_ms(10);
   PORTB=0xff;
  }
}

/*毫秒延时程序*/
void delay_ms(unsigned char i)
 { 
 unsigned char a, b;
  for (a = 1; a < i; a++) 
  {  
   for (b = 1; b; b++) 
   {   
    ;   
   } 
  }
}

/*主程序*/
void main(void)
{

  init_devices();
  while(1)
  {
   set_detect();
   data_split();
   display();
  }
}