MSP430F149的内部参考电压怎么输出到VEREF引脚？

只看该作者 · 2014-10-15 16:33

我用以下的代码，都没有输出2.5V呢？

ADC12CTL0 &=~ ENC; //在进行设置时首先复位ADC的转换使能
ADC12CTL0 = ADC12ON+REF2_5V+SHT0_8; //采用内部2.5V参考,打开通道10REFON自动打开
ADC12CTL1 = SHP+ADC12SSEL_2; //上升沿采样，主时钟，MEM0
ADC12MCTL0 = EOS + INCH_10+SREF_1; //选择通道10，Vref+为参考电压，进行温度测量
ADC12CTL0 |= ENC;

只看该作者 · 2014-10-15 16:50

#include "msp430x14x.h" // Standard Equations

void main(void)
{
unsigned int i;
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL = 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+SHT0_2+REFON+REF2_5V; // Turn on and set up ADC12,2.5V Internal REF
//ADC12CTL0 = ADC12ON+SHT0_2+REFON; // Turn on and set up ADC12,1.5V Internal REF
ADC12CTL1 = SHP; // Use sampling timer
ADC12MCTL0 = SREF_1; // Vr+=Vref+

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

ADC12CTL0 = ENC; // Enable conversions

while (1)
{
ADC12CTL0 = ADC12SC; // Start conversion
while ((ADC12IFG & BIT0)==0);
_NOP(); // SET BREAKPOINT HERE
}
}

用这个代码，没有任何的输出，VeREF脚为0V