MSP430F149 ADC12输出一直是0x0FFF

void ADC12_Init(void)

{

volatile unsigned int i;



P6SEL |= 0x02; // Enable A/D channel A0 

P6DIR &= ~BIT1; // 设置P6.0为输入



ADC12CTL0 &= ~ENC;



ADC12CTL0 = ADC12ON+SHT0_2+REFON+REF2_5V; // Turn on and set up ADC12

ADC12CTL1 = SHP; // Use sampling timer



ADC12MCTL1 = SREF_1 + INCH_1; // Vr+=Vref+



for ( i=0; i<0x3600; i++) // Delay for reference start-up

{



}



ADC12CTL0 |= ENC; // Enable conversions

}





/****************************************************************************************

函数名称: ADC12_Convert(void)

功 能: ADC12 启动函数

参 数: 无

返回值 : 无

说明 :



****************************************************************************************/

unsigned int ADC12_Convert(void)

{

unsigned int temp = 0;



ADC12CTL0 |= ADC12SC; // ADC12SC 启动模式

while ((ADC12IFG & BIT0) == 0); // 等待ADC 完成



temp = ADC12MEM1; 



return temp;

}

void Init_ADC()

{

P6SEL = 0x07;

P6DIR &= ~BIT0;

P6DIR &= ~BIT1;

P6DIR &= ~BIT2;

P6DIR &= ~BIT3;



ADC12CTL0 &= ~(ENC);

ADC12CTL1 |= CSTARTADD_0;



ADC12MCTL0 = INCH_0;

ADC12MCTL1 = INCH_1;

ADC12MCTL2 = INCH_2;

ADC12MCTL3 = INCH_3 + EOS;



ADC12CTL0 |= ADC12ON;

ADC12CTL0 |= MSC;



ADC12CTL1 |= CONSEQ_1;

ADC12CTL1 |= ADC12SSEL_1;

ADC12CTL1 |= ADC12DIV_0;

ADC12CTL1 |= (SHP);



ADC12CTL0 |= ENC;



return;

}



void Init_TimerA()

{

TACTL = TASSEL1 + TACLR;

CCTL0 = CCIE;

CCR0 = 40000;

TACTL |= MC0;

}



#pragma vector = TIMERA0_VECTOR

__interrupt void TimerA_ISR(void)

{

int results[4] = {0};

uchar SendL, SendH;



ADC12CTL0 &= ~ENC;



results[0] = ADC12MEM0;

// ADC12MEM1 = 0x0E0D;



results[1] = ADC12MEM1;

SendL = results[1] % 256;

SendH = results[1] >> 8;

Uart0_Send(SendH);

Uart0_Send(SendL);

Uart0_Send(0xEE); 

results[2] = ADC12MEM2;



results[3] = ADC12MEM3;





ADC12MEM1 = 0x0000; 

ADC12CTL0 |= ENC + ADC12SC;



}