peripheral.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>
#define DELAY 100
sbit BELL=P3^7;
typedef unsigned char uchar; 
typedef unsigned int uint; 

uchar GetKey()
{
	uchar KeyValue,KeyTemp;
	uint t;
	KeyValue=P0 & 0xf0;
	if(KeyValue==0xf0)
		return 0;
    t=DELAY;
	while(t--);
	if( (P0 & 0xf0) !=KeyValue)
		return 0;
	while(1)
	{
		KeyTemp=P0 & 0xf0;
		t=DELAY;
	   	while(t--);
		if((P0 & 0xf0)==KeyTemp && 0xf0==KeyTemp)
			break;
	}
	switch(KeyValue)
	{
		case 0xe0:return 4;
		case 0xd0:return 3;
		case 0xb0:return 1;
		case 0x70:return 2;
		default:return 0;				
	}
}
void Beep(uint delay)
{
	unsigned int i;
	BELL=1;
	for(i=0;i<delay;i++);
	BELL=0;
}
void SendUART(unsigned char c)
{
	  SBUF0=c;
	  while(!TI0);
	  	TI0=0;
}

void SendStrUART(char *c,int length)
{
	int i=0;
	while(i<length)
	{
	  	SBUF0=*c;
	  	c++;i++;
	  	while(!TI0){};
	  	TI0=0;
	}
}
void EnableADC()
{
	AD0EN=1;
}
void DisableADC()
{
	AD0EN=0;
}