Question

MSP430单片机ADDC12电压采集程序

Answer 1

单片机（Microcontrollers）是一种集成电路芯片，是采用超大规模集成电路技术把具有数据处理能力的中央处理器CPU、随机存储器RAM、只读存储器ROM、多种I/O口和中断系统、定时器/计数器等功能（可能还包括显示驱动电路、脉宽调制电路、模拟多路转换器、A/D转换器等电路）集成到一块硅片上构成的一个小而完善的微型计算机系统，在工业控制领域广泛应用。从上世纪80年代，由当时的4位、8位单片机，发展到现在的300M的高速单片机。

Answer 2

/**********************************************
*功 能：单通道采样一次,选用内部的参考电压2.5V
*入口参数：channel:选择的采样通道 0~7
*出口参数：采样得到的数字值
***********************************************/
unsigned int sample1(int channel)
{
switch(channel)
{ case 0: P6SEL |= BIT0; break; //A0
case 1: P6SEL |= BIT1; break; //A1
case 2: P6SEL |= BIT2; break;
case 3: P6SEL |= BIT3; break;
case 4: P6SEL |= BIT4; break;
case 5: P6SEL |= BIT5; break;
case 6: P6SEL |= BIT6; break;
case 7: P6SEL |= BIT7; break; //A7
default:P6SEL |= BIT0;
}
ADC12CTL0 = ADC12ON + SHT0_2 +REF2_5V;//2.5V内部参考电压
ADC12CTL1 = SHP; //采样信号来源采样定时器
ADC12MCTL0 =(unsigned char)channel; //VR+=VREF+,VR-=AVss
ADC12CTL0 |= ENC; //使能
ADC12CTL0 |= ADC12SC; //开始采样转换
while((ADC12IFG & BIT0)==0);
return (unsigned int)(ADC12MEM0);
}
/**********************************************
*功 能：单通道采样一次,选用外部参考电压2.5V
*入口参数：channel:选择的采样通道 0~7
*出口参数：采样得到的数字值
***********************************************/
unsigned int sample2(int channel)
{
switch(channel)
{ case 0: P6SEL |= BIT0; break; //A0
case 1: P6SEL |= BIT1; break; //A1
case 2: P6SEL |= BIT2; break;
case 3: P6SEL |= BIT3; break;
case 4: P6SEL |= BIT4; break;
case 5: P6SEL |= BIT5; break;
case 6: P6SEL |= BIT6; break;
case 7: P6SEL |= BIT7; break; //A7
default:P6SEL |= BIT0;
}
ADC12CTL0 = ADC12ON + SHT0_2 +REF2_5V;//2.5V内部参考电压
ADC12CTL1 = SHP; //采样信号来源采样定时器
ADC12MCTL0 =SREF_2+(unsigned char)channel; //Vr+=VeEF+,Vr-=AVss
ADC12CTL0 |= ENC; //使能
ADC12CTL0 |= ADC12SC; //开始采样转换
while((ADC12IFG & BIT0)==0);
return (unsigned int)(ADC12MEM0);
}
#include <msp430x44x.h>
#include "ADC12.c"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT

P5DIR |= 0x02; // P5.1 output
for (;;)
{
if(sample1(1)<120)
P5OUT &= ~0x02;
else P5OUT |= 0x02;
}
}
// ADC12 interrupt service routine
#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR (void)
{
if (ADC12MEM0 < 120)
P5OUT &= ~0x02; // Clear P5.1 LED off
else
P5OUT |= 0x02; // Set P5.1 LED on
_BIC_SR_IRQ(CPUOFF); // Clear CPUOFF bit from 0(SR)
}
这么久了，还请采纳，俺可是付出的啊