cycleforsmall100us.c

ATmega16应用例子

//ICC-AVR application builder : 2005-6-30 12:09:57
// Target : M16
// Crystal: 7.3728Mhz

#include <iom16v.h>
#include "D:\ICC_H\CmmICC.H"

/* control port */
#define SET_RS  PORTA |= 0x01	
#define CLR_RS  PORTA &= 0xFE	
#define SET_RW  PORTA |= 0x02	
#define CLR_RW  PORTA &= 0xFD	
#define SET_E   PORTA |= 0x04	
#define CLR_E   PORTA &= 0xFB	

/* data port */
#define SET_D4  PORTA |= 0x10	//SET PA4
#define CLR_D4  PORTA &= 0xEF	//CLR PA4
#define SET_D5  PORTA |= 0x20	//SET PA5
#define CLR_D5  PORTA &= 0xDF	//CLR PA5
#define SET_D6  PORTA |= 0x40	//SET PA6
#define CLR_D6  PORTA &= 0xBF	//CLR PA6
#define SET_D7  PORTA |= 0x80	//SET PA7
#define CLR_D7  PORTA &= 0x7F	//CLR PA7

/* busy port */
#define GET_BF  PINA &  0x80	//GET PD7
#define OUTPUT_BF DDRA |= 0x80  //OUTPUT
#define INPUT_BF  DDRA &= 0x7F	//INPUT

#include "D:\ICC_H\LCD1602_.H"

uint32 cycle;  
//const uint32 TIME_1S = 1000000;  
uint16 T1OvfTimes=0;

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

//TIMER1 initialisation - prescale:1024
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 1Hz
// actual value:  1.000Hz (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1 = 0; 	//setup
 ICR1 =  0;
 TCCR1A = 0x00;
 TCCR1B = 0x02; //start Timer, Timer source=CLK/8
}

#pragma interrupt_handler timer1_capt_isr:6
void timer1_capt_isr(void)
{
 TCCR1B = 0x00; //stop
 //frq=(ICR1+86);
 //frq=TIME_1S/frq;	 				// read (int)value in ICR1 using
 cycle=ICR1-24;
 //cycle = 1000000;
 if(T1OvfTimes!=0)
 	 cycle += (uint32)T1OvfTimes*65535;
 T1OvfTimes = 0;
 ICR1=0;
 TCNT1=0;
 TCCR1B=0X02;
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void)
{
 T1OvfTimes++;
}


//call this routine to initialise all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer1_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x24; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialised
}

//
void main(void)
{
 init_devices();
 DDRA = 0XFF;	//set lcd port as output
 DDRB = 0X00;	//set ICP port as ???

 LCD1602_init();
 LCD1602_puts(0x80,"Cycle:   s ms us");
 while(1)
 { 
   LCD1602_putd(0xcf,cycle,7);
   //LCD1602_putd(0xcd,cycle/1000,7);
   delay50ms(10);
}
}