adcsamplesingle.c

zigbee通信系统中使用芯片cc2430实现点对点通信的源码

/******************************************************************************
Filename:     adcSampleSingle.c
Target:       cc2430
Revised:      16/12-2005
Revision:     1.0
*******************************************************************************/
#include "hal.h"

//-----------------------------------------------------------------------------
// See hal.h for a description of this function.
//-----------------------------------------------------------------------------
INT16 halAdcSampleSingle(BYTE reference, BYTE resolution, UINT8 input) {
    BYTE volatile temp;
    INT16 value;

    //reading out any old conversion value
    temp = ADCH;
    temp = ADCL;


    ADC_ENABLE_CHANNEL(input);
    ADC_STOP();

    ADC_SINGLE_CONVERSION(reference | resolution | input);

    while (!ADC_SAMPLE_READY());

    ADC_DISABLE_CHANNEL(input);

    value = (((INT16)ADCH) << 8);
    value |= ADCL;

    resolution >>= 3;
    return value >> (8 - resolution);
}