timer.c

使用C8051F实现脉搏及血氧饱和度测量 包括均值滤波

#include <c8051f020.h>
#include "peripheral.h"
#include "sample.h"


sbit DA0=P0^2;
sbit DA1=P0^3;
void Timer2_ISR() interrupt 5
{
	static state=0;
	TF2=0;
	switch(state)
	{
		case 0:
			DA0=1;
			DA1=0;
			state++;
			break;
		case 1:
			DA0=0;
			DA1=0;
			state++;
			break;
		case 2:
			DA0=0;
			DA1=1;
			state++;
			break;
		case 3:
			DA0=0;
			DA1=0;
			state=0;

			DataPos++;
			break;
		default:break;
	}
	/*****************************/
	if(DataPos>=PREWAIT)
	{
		AD0INT=0;
		AD0BUSY=1;
		while(!AD0INT);
		switch(state)
		{
		case 0:
			DC_RED=DC_RED+ADC0H;
			AMX0SL=0x03; //Next channel=SignalRed
			break;
		case 1:
			SampleRed[DataPos-PREWAIT]=ADC0H;
			if(ADC0H>RED_MAX)
				RED_MAX=ADC0H;
			if(ADC0H<RED_MIN)
				RED_MIN=ADC0H;
			AMX0SL=0x01; //Next channel=DC_IRED
			break;
		case 2:
			DC_IRED=DC_IRED+ADC0H;
			AMX0SL=0x04; //Next channel=SignalIRed
			break;
		case 3:
			SampleIRed[DataPos-PREWAIT]=ADC0H;
			if(ADC0H>IRED_MAX)
				IRED_MAX=ADC0H;
			if(ADC0H<IRED_MIN)
				IRED_MIN=ADC0H;
			AMX0SL=0x00; //Next channel=DC_RED
			break;
		default:break;
		}
	}
	
	/*****************************/
  	
	if(DataPos>=SAMPLESIZE+PREWAIT)
	{
		DC_RED/=SAMPLESIZE;
		DC_IRED/=SAMPLESIZE;
		TR2=0;
	}
}