main.c

ds18b20在数码管上显示温度,在avr128已编译通过

// Target : M128
// Crystal: 8.0000Mhz

#include <iom128v.h>
#include <macros.h> 
#include "define.h"
#include "delay.h"
#include "initrialm128.h"
#include "ds18b20.h"

//#include 
void Coding_led(void);//8位数码管译码程序


//TIMER0 initialize - prescale:1024
// WGM: Normal
// desired value: 3mSec
// actual value: 2.976mSec (0.2%)
void timer0_init(void)
{
	TCCR0 = 0x00; //stop
	ASSR  = 0x00; //set async mode
	TCNT0 = 0xA3; //set count
	OCR0  = 0x1F;
	TCCR0 = 0x06; //start timer
	TIMSK |= 0x01; //timer interrupt sources
}

#pragma interrupt_handler timer0_ovf_isr:iv_TIM0_OVF
void timer0_ovf_isr(void)
{	
	TCNT0 = 0xA3; //reload counter value
	if(sbit_led == 8)
	{
		sbit_led = 0;
	}
	SMG_PORT = 0XFF;
	SMG_BIT_PORT = 0xff;
	SMG_BIT_PORT &=~ BIT(sbit_led);
	SMG_PORT = led_disbuf[sbit_led];
	sbit_led ++;
}


void main(void)
{
	unsigned char n;
	Init_Devices();
	timer0_init();
	BELL_OFF();
	
	while(1)
	{
		temperture = readTempDS18B20();
		temperture = temperture * 0.0625*10;
		if(temperture < 1000)//ds18b20由于进中断后干扰时序，最好加上校验数据
							//时间有限先大概判断ds18b20的温度濉< 100.0
		{
			led_buf[0] = (int)temperture/10000000%10;
			led_buf[1] = (int)temperture/1000000%10;
			led_buf[2] = (int)temperture/100000%10;
			led_buf[3] = (int)temperture/10000%10;
			led_buf[4] = (int)temperture/1000%10;
			led_buf[5] = (int)temperture/100%10;
			led_buf[6] = (int)temperture/10%10;
			led_buf[7] = (int)temperture%10;
		}
		
		if(led_buf[0] == 0)
		{
			led_buf[0] = 25;
			if(led_buf[1] == 0)
			{
				led_buf[1] = 25;
				if(led_buf[2] == 0)
				{
					led_buf[2] = 25;
					if(led_buf[3] == 0)
					{
						led_buf[3] = 25;
						if(led_buf[4] == 0)
						{
							led_buf[4] = 25;
							if(led_buf[5] == 0)
							{
								led_buf[5] = 25;
								if(led_buf[6] == 0)
								{
									led_buf[6] = 25;
								}
							}
						}
					}
				}
			}
		}		
		Coding_led();
		led_disbuf[6] &=~ BIT(7);
	}	

}


void Coding_led(void)//8位数码管译码程序
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		led_disbuf[i] = led_table[led_buf[i]];
	}
}