给一个DTU操作的例程给你参考
//******************************************************************************
// MSP430F21x2 Demo - ADC10, DTC Sample A0 64x, 1.5V, Repeat Single, DCO
//
// Description: Use DTC to sample A0 64 times with reference to internal 1.5v.
// Vref Software writes to ADC10SC to trigger sample burst. In Mainloop MSP430
// waits in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC)
// will force exit from LPM0 in Mainloop on reti. ADC10 internal
// oscillator times sample period (16x) and conversion (13x). DTC transfers
// conversion code to RAM 200h - 280h. P1.0 set at start of conversion burst,
// reset on completion.
//
// MSP430F21x2
// -----------------
// /|| XIN|-
// | | |
// --|RST XOUT|-
// | |
// >---|P2.0/A0 P1.0|-->LED
//
// A. Dannenberg
// Texas Instruments Inc.
// December 2007
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x21x2.h"
for (;;)
{
ADC10CTL0 &= ~ENC;
while (ADC10CTL1 & BUSY); // Wait if ADC10 core is active
ADC10SA = 0x200; // Data buffer start
P1OUT |= 0x01; // Set P1.0 LED on
ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit
P1OUT &= ~0x01; // Clear P1.0 LED off
}
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
}
#pragma vector=TIMER0_A0_VECTOR
__interrupt void TA0_ISR(void)
{
TACTL = 0; // Clear Timer_A control registers
__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
}
//******************************************************************************
// MSP430F21x2 Demo - ADC10, DTC Sample A0 64x, 1.5V, Repeat Single, DCO
//
// Description: Use DTC to sample A0 64 times with reference to internal 1.5v.
// Vref Software writes to ADC10SC to trigger sample burst. In Mainloop MSP430
// waits in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC)
// will force exit from LPM0 in Mainloop on reti. ADC10 internal
// oscillator times sample period (16x) and conversion (13x). DTC transfers
// conversion code to RAM 200h - 280h. P1.0 set at start of conversion burst,
// reset on completion.
//
// MSP430F21x2
// -----------------
// /|| XIN|-
// | | |
// --|RST XOUT|-
// | |
// >---|P2.0/A0 P1.0|-->LED
//
// A. Dannenberg
// Texas Instruments Inc.
// December 2007
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x21x2.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
ADC10CTL1 = CONSEQ_2; // Repeat single channel
ADC10CTL0 = SREF_1 + ADC10SHT_2 + MSC + REFON + ADC10ON + ADC10IE;
TACCR0 = 30; // Delay to allow Ref to settle
TACCTL0 |= CCIE; // Compare-mode interrupt
TACTL = TASSEL_2 + MC_1; // TACLK = SMCLK, Up mode
__bis_SR_register(CPUOFF + GIE); // LPM0, TA0_ISR will force exit
TACCTL0 &= ~CCIE; // Disable timer Interrupt
ADC10DTC1 = 0x40; // 64 conversions
ADC10AE0 |= 0x01; // P2.0 ADC option select
P1DIR |= 0x01; // Set P1.0 output
for (;;)
{
ADC10CTL0 &= ~ENC;
while (ADC10CTL1 & BUSY); // Wait if ADC10 core is active
ADC10SA = 0x200; // Data buffer start
P1OUT |= 0x01; // Set P1.0 LED on
ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit
P1OUT &= ~0x01; // Clear P1.0 LED off
}
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
}
#pragma vector=TIMER0_A0_VECTOR
__interrupt void TA0_ISR(void)
{
TACTL = 0; // Clear Timer_A control registers
__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
}
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