time._c

来自「用ICC编写的程序包括SPI」· _C 代码 · 共 65 行

#include "time.h"

unsigned char time_flag=0;
unsigned char pwm=0x7f;
extern int F;
extern int qep_cnt[];
#pragma interrupt_handler timer2_ovf_isr:5
void timer2_ovf_isr(void)
{
 TCNT2 = 0x64; //reload counter value
 time_flag=1;
 F=qep_cnt[0]*6;
 //qep_cnt[0]=0;
}

//TIMER2 initialize - prescale:256
// WGM: Normal
// desired value: 5mSec
// actual value:  4.965mSec (0.7%)
void timer2_init(void)
{
 TCCR2 = 0x00; //stop
 ASSR  = 0x00; //set async mode
 TCNT2 = 0x64; //setup
 OCR2  = 0x9C;
 TCCR2 = 0x06; //start
 time_flag=0;
}

//TIMER1 initialize - prescale:1
// WGM: 8) PWM phz freq correct, TOP=ICRn
// desired value: 14.4KHz
// actual value: 14.456KHz (0.4%)
void timer1_init(void)
{
 DDRD|=BIT(PORTD4)|BIT(PORTD5);
 TCCR1B = 0x00; //stop
 TCNT1H = 0xFF; //setup
 TCNT1L = 0x01;
 OCR1AH = 0x00;
 OCR1AL = 0x7f;
 OCR1BH = 0x00;
 OCR1BL = 0x7f;
 ICR1H  = 0x00;
 ICR1L  = 0xFF;
 TCCR1A = 0xA0;
 TCCR1B = 0x11; //start Timer
}
void pwm_change(unsigned char pwm)
{
 OCR1AH = 0x00;
 OCR1AL = pwm;
 OCR1BH = 0x00;
 OCR1BL = pwm;
 ICR1H  = 0x00;

}