adcsamplesingle.c

来自「基于cc2430的无限通信实例」· C语言 代码 · 共 47 行

/******************************************************************************
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();

    halWait(5);

    ADC_SINGLE_CONVERSION(reference | resolution | input);

    while (!ADC_SAMPLE_READY());

    ADC_DISABLE_CHANNEL(input);

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

    if(value & 0x8000)
    {
		value = ~value + 1;
    }

    resolution >>= 3;
    value >>= (7 - resolution);
	asm("nop");
	asm("nop");
    return value;
}