MSP430F149ADC12單通道單次轉(zhuǎn)換

#include <msp430x14x.h>

#define uint unsigned int

#define uchar unsigned char

static uchar adc_flag = 0 ;

uint AD_TEMP = 0 ;

void int_clk()

{

uchar i ;

BCSCTL1&=~XT2OFF; //打開XT振蕩器

BCSCTL2|=SELM1+SELS; //MCLK為8MHz,SMCLK為8MHz

do

{

IFG1&=~OFIFG; //清除振蕩錯誤標志

for(i=0;i<100;i++)

_NOP(); //延時等待

}

while((IFG1&OFIFG)!=0); //如果標志為1,則繼續(xù)循環(huán)等待

IFG1&=~OFIFG;

}

int_adc()

{

P6SEL |= BIT0 ; //選擇ＡＤ通道

ADC12CTL0 |= ADC12ON + SHT0_2 + REF2_5V + REFON ; //采樣保持時間為16個ADC12CLK

/*ADC12ON ADC模塊電源控制位；

REF2_5V 內(nèi)部參考電壓選擇位０：１.５Ｖ　　１：２.５Ｖ

REFON 參考電壓模塊控制位０：關(guān)閉　１：打開*/

ADC12CTL1 |= ADC12SSEL0 + ADC12SSEL1 ; //ADC12時鐘源選擇控制位　00ADC12OSC 01ACLK 10MCLK 11SMCLK

ADC12MCTL0 = 0x10; // 連續(xù)轉(zhuǎn)換結(jié)束通道，CHANNEL = A0 參考選擇控制位

ADC12IE |= 0x01; //使能A/D轉(zhuǎn)換器

ADC12CTL0 |= ENC ; //AD轉(zhuǎn)換使能

}

#pragma vector = ADC_VECTOR

__interrupt void ADC12ISR(void)

{

while((ADC12CTL1 & 0x01)== 1); //等待轉(zhuǎn)換完

adc_flag = 1 ;

AD_TEMP = ADC12MEM0 ; //設(shè)置ＡＤ轉(zhuǎn)換完成標志，并讀取ＡＤＣ值

}

void main()

{

WDTCTL = WDTPW + WDTHOLD ;

int_clk();

int_adc();

_EINT(); //使能中斷

adc_flag = 1 ;

while(1)

{

while(adc_flag == 1)

{

ADC12CTL0 |= ADC12SC ; //開啟轉(zhuǎn)換

ADC12CTL0 &= ~ADC12SC ;

adc_flag = 0 ; //清中斷標志

}

}

}