lc._c

ICC-AVR环境,用ATmage16做的LC表

#include <iom16v.h>
#include <macros.h>
#include <stdlib.h>
#include "LCD.h"

#define C1			   1	  //C1=1uF
#define L1			   100	  //L1=100uH

unsigned int last_TCNT1,Cx,Lx;
unsigned int Cn;			  //分布电容,单位pf
unsigned char buf[8]="";

/*------------------------------函数原型声明------------------------------*/
void delay_nus        (unsigned char n);
void delay_nms        (unsigned char n);
void timer1_init	  (void);
void timer2_init	  (void);
void calc_Cn		  (void);
void calc_Cx		  (void);
void calc_Lx		  (void);
/*------------------------------------------------------------------------*/

void main(void)
{
	unsigned char k=5;
	/*----取消-----
	OSCCAL=0xA9;
	-------------*/
		
	DDRA|=LCD_DATA;   // 数据为输出
	DDRC|=LCD_RS|LCD_EN;  //置位RS和EN
	DDRD=0x00;
	PORTD=0xFF;
	LCD_init();
	
	while (--k)
		 delay_nms(100);
	
	CLI(); //disable all interrupts
	timer1_init();
	timer2_init();
	MCUCR = 0x00;
	GICR  = 0x00;
	TIMSK = 0x40; //timer interrupt sources
	SEI();
	
	LCD_write_char(0x01,0);
	delay_nms(2);
	while(1);
}

#pragma interrupt_handler timer2_ovf_isr:5
void timer2_ovf_isr(void)
{
 	unsigned char PD;
    TCCR2 = 0x00; //stop Timer1
	TCCR1B= 0x00; //stop Timer2
	last_TCNT1=TCNT1;
	
	PD=PIND;
	if(PD|0xFE==0xFE) //PORTD.0为0,校准模式,不接Cx和Lx
	{ 
		LCD_write_char(0x01,0);
		delay_nms(2);
		LCD_set_xy(0,0);
		
		LCD_write_char(0,'C');
		LCD_write_char(0,'n');
		LCD_write_char(0,'=');
		calc_Cn();
		
		LCD_write_string(0,1,"TCNT1=");
		LCD_write_string(1,1,itoa(buf,last_TCNT1,10));
		
	}
	else //测量模式,接入被测元件Cx或Lx
	{ 
		LCD_write_char(0x01,0);
		delay_nms(2);
		
		LCD_set_xy(0,0);
		LCD_write_char(0,'C');
		LCD_write_char(0,'x');
		LCD_write_char(0,'=');
		calc_Cx();
		
		LCD_set_xy(0,1);
		LCD_write_char(0,'L');
		LCD_write_char(0,'x');
		LCD_write_char(0,'=');
		calc_Lx();
	}
	
	timer1_init();
	timer2_init();
}

void timer1_init(void)
{
	TCCR1B = 0x00; //stop
	TCNT1H = 0x00;
	TCNT1L = 0x00;
	TCCR1A = 0x00;
	/*----取消-----
	OCR1AH = 0x00;
	OCR1AL = 0x39;
	OCR1BH = 0x00;
	OCR1BL = 0x39;
	ICR1H  = 0x00;
	ICR1L  = 0x39;
	-------------*/
	TCCR1B = 0x06; //start,外部下降沿触发
}

void timer2_init(void)
{
	TCCR2 = 0x00; //stop
	ASSR  = 0x00; //同步计算模式
	TCNT2 = 0x0A; //置初值,定时0.25s
	/*----取消-----
	OCR2=0x9C;
	-------------*/
	TCCR2 = 0x07; //start,系统时钟1024分频
}

void calc_Cn(void)
{
 	float f=1/(last_TCNT1*4)*1000000;
	Cn=(1/(39.4384*f*f*L1)-C1)/1000000;
	
	LCD_write_string(3,0,itoa(buf,Cn,10));
	LCD_write_char(0,'p');
	LCD_write_char(0,'F');
	
}

void calc_Cx(void)
{
 	float f=1/(last_TCNT1*4)*1000000;
	Cx=(1/(39.4384*f*f*L1)-C1)/1000000-Cn;
	
	LCD_write_string(3,1,itoa(buf,Cn,10));
	LCD_write_char(0,'p');
	LCD_write_char(0,'F');
}


void calc_Lx(void)
{
	float f=1/(last_TCNT1*4)*1000000;
	Lx=1/(39.4384*f*f*(C1+Cn*1000000));
	
	LCD_write_string(3,1,itoa(buf,Cn,10));
	LCD_write_char(0,'u');
	LCD_write_char(0,'H');
}

/*--------------------------------延时函数--------------------------------*/
void delay_nus(unsigned char n)       //N us延时函数
{
	while (--n)
	{
		asm("nop");
	}
}

void delay_1ms(void)                 //1ms延时函数
{
	unsigned char i=10,j=100;
	while (--i)
		while (--j)
			asm("nop");
}

void delay_nms(unsigned char n)       //N ms延时函数
{
	while (--n)
		delay_1ms();
}
/*------------------------------------------------------------------------*/