ad.c

来自「此源码是用的NEC公司的MCU78F0396」· C语言 代码 · 共 50 行

//******************************************************
//  Filename :	AllSerial.c
//  Abstract :	This file implements main function.
//
//  Device    :	uPD78F0396
//  CreateTime: 2006/11/01
//  Author    :  

//******************************************************

#include "UsrComm.h"
#include "AD.h"

void AD_Init(void)
{
	ADPC = 0x06;  //enable P26,p27 analoy input besides Comm  digtal I/0 
	PM2  = 0xD0;  //p27.p26 input mode
	ADS = 0;   
	ADM = 0x00;   //fPRS/12  2.7V<=AVref<=5.5V 
	 
}
//=====================================

void AD_Start( void )
{
	int delay = 200;
	SetIORBit(ADM, 0x01); /* comparator operation */
	while(delay--);
	SetIORBit(ADM, 0x80);
	
}

//=====================================

void AD_Read( USHORT* buffer )
{
	if(ADIF == 0)  //finish convert 
	*buffer = (USHORT)( ADCR >> 6 );
	
}

//=====================================

void AD_Stop( void )
{
	ClrIORBit(ADM, 0x01);
	ClrIORBit(ADM, 0x80);  // stop AD conversion
	
}