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问 //******************************************************************************
// MSP-FET430P120 Demo - ADC10 Sample A10Temp and Convert to oC and oF
//
// Description; A single sample is made on A10 with refernce to internal
// 1.5V Vref. Software sets ADC10SC to start sample and conversion - ADC10SC
// automatically cleared at EOC. ADC10 internal oscillator/4 times sample
// (64x) and conversion. In Mainloop MSP430 waits in LPM0 to save power until
// ADC10 conversion complete, ADC10_ISR will force exit from any LPMx in
// Mainloop on reti. Temperaure in oC stored in IntDegC, oF in IntDegF.
//
// Uncalibrated temperature measured from device to devive will vary with
// slope and offset from device to device - please see datasheet.
// //*MSP430F1232 or MSP430F1132 Device Required*//
//
// MSP430F1232
// -----------------
// /|\| XIN|-
// | | |
// --|RST XOUT|-
// | |
// |A10 |
//
// M.Buccini
// Texas Instruments, Inc
// January 2002
// Built with IAR Embedded Workbench Version: 1.25A
//******************************************************************************

#include <MSP430x12x2.h>
unsigned int long temp;
unsigned int long IntDegF;
unsigned int long IntDegC;

void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
ADC10CTL1 = INCH_10+ADC10DIV_3; // Temp Sensor ADC10CLK/4
ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;

while(1)
{
ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
_BIS_SR(CPUOFF + GIE); // LPM0 with interrupts enabled

// oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = x*761/1024 - 468
temp = ADC10MEM;
IntDegF = ((temp - 630) * 761) / 1024;

// oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = x*423/1024 - 278
temp = ADC10MEM;
IntDegC = ((temp - 673) * 423) / 1024;

_NOP(); // SET BREAKPOINT HERE
}
}

// ADC10 interrupt service routine
interrupt[ADC10_VECTOR] void ADC10_ISR (void)
{
_BIC_SR_IRQ(CPUOFF); // Clear CPUOFF bit from 0(SR)
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