adcdrv.c

LPC932的AD驱动代码,置信熟读很快的哦

/*
	adcDrv.c
        Read ADC value
*/

/*@+relaxquals@*/	 //SPLINT avoid detecting each time a char is stored in an int
/*@+charindex@*/         //Only detect if used in a dengirus way	

#include "adcDrv.h"
#include <iom88.h>
void acdDrv_init(void)
{
  // Enable AD converter and set prescaler to 64 (8M Hz /64 = 125k Hz)
  ADCSRA = (unsigned char)0x80 | 6;

  //Make first conversation (setup ref voltage)
  adcDrv_getAdc(GND);
}

unsigned int adcDrv_getAdc(enum ADCCHANNEL ch)
{  

  volatile unsigned char temp;
  
  // Enable AD converter and set prescaler to 64 (8M Hz /64 = 125k Hz)
  ADCSRA = (unsigned char)0x80 | 6;
  
  //Use Connext VAVCC to  ref no left adjust, and select channel
  ADMUX = (unsigned char)0x40 | (unsigned char)ch;
  
  //Start AD conversion
  ADCSRA_Bit6 =(unsigned char)1;
  
  //Wait for conversation to end
  //while(ADCSRA_Bit6){;};
  while((temp=ADCSRA_Bit6)!= (unsigned char)0){;};
//  for(temp=ADCSRA; (temp&(1<<6))!= (unsigned char)0; temp=ADCSRA){;};
  
  return ADC;
}