adc.c

阿根廷教授编写的嵌入式internet的实验教程的高质量代码

/******************************************************************************************
   ADC.c (v1.0)
-------------------------------------------------------------------------------------
This code is from the book:
"Embedded Internet: TCP/IP Basics, Implementation and Applications" by Sergio Scaglia
[Pearson Education, 2006 - ISBN: 0-32-130638-4]

This code is copyright (c) 2006 by Sergio Scaglia, and it may only be used for educational
purposes.  For commercial use, please contact me at [e-mail]
For more information and updates, please visit www.embeddedinternet.org
******************************************************************************************/

#include "ADC.h"
#include "sysClock.h"
#include <iolpc2129.h>

void ADC_init(void) {

  ADCR = ((int)(pClkFreq()) / 4500000)	<< 8;
  ADCR  |= 0x00270001;    // Setup A/D
  ADCR  |= 0x01000000;    // Start A/D Conversion
}


unsigned int ADC_Read(void) {
  unsigned int val=0;

  do{
    val = ADDR;                       // Read A/D Data Register
  }while ((val & 0x80000000) == 0);   //Wait for the conversion to complete
  return ((val >> 6) & 0x03FF);
}