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MSP430f5529利用adc12采样不到数据！！

crace shi
Prodigy 20 points

  我利用Timer_A在P1.2端口产生25Hz的PWM波，然后将P1.2于P6.2用杜邦线连在一起，之后设置adc_12利用其的channel A2采样，但是运行程序时总采不到数据，下面是adc初始化代码。请教哪里有问题！！急

       P6SEL |= BIT2;
       ADC12IE |= 0x04; 
       ADC12CTL0 = ADC12ON + ADC12SHT0_10 + ADC12MSC;
       ADC12CTL1 = ADC12SHS_0 + ADC12SHP +ADC12CONSEQ_2 + ADC12CSTARTADD_2 + ADC12SSEL_2 +ADC12DIV_7; // 设置ADC colck = 0.5MHz
       ADC12MCTL2 = ADC12INCH_2; // p6.1 channel
       ADC12CTL0 = ADC12ENC + ADC12SC;