MSP430的c程序集合.zip_msp430

//****************************************************************************** // MSP-FET430P140 Demo - Timer_A Toggle P1.0-3 CCRx Contmode ISR, HF XTAl ACLK // // Description; Use timer_A CCRx units and overflow to generate four // independent timing intervals. For demonstration, CCR0, CCR1 and CCR2 output // units are optionally selected with port pins P1.1, P1.2 and P1.3 in toggle // mode. As such, these pins will toggle when respective CCRx registers match // the TAR counter. Interrupts are also enabled with all CCRx units, // software loads offset to next inderval only - as long as the interval offset // is aded to CCRx, toggle rate is generated in hardware. Timer_A overflow ISR // is used to toggle P1.0 with software. // ACLK = MCLK = TACLK = HF XTAL // As coded with TACLK = HF XTAL and assuming HF XTAL = 8Mhz, toggle rates: // P1.1 = CCR0 = 8MHz/(2*200) = 20kHz // P1.2 = CCR1 = 8MHz/(2*1000) = 4kHz // P1.3 = CCR2 = 8MHz/(2*10000) = 400Hz // P1.0 = overflow = 8MHz/(2*65536) = 61Hz // Proper use of TAIV interrupt vector generator demonstrated. // //** HF XTAL NOT INSTALLED ON FET **//; // // MSP430F149 // --------------- // /|\| XIN|- // | | | HF XTAL (455k - 8Mhz) // --|RST XOUT|- // | | // | P1.1|--> CCR0 // | P1.2|--> CCR1 // | P1.3|--> CCR2 // | P1.0|--> overflow/software // // M.Buccini // Texas Instruments, Inc // January 2002 // Built with IAR Embedded Workbench Version: 1.25A //****************************************************************************** #include "msp430x14x.h" void main(void) { unsigned int i; WDTCTL = WDTPW + WDTHOLD; // Stop WDT BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL do { IFG1 &= ~OFIFG; // Clear OSCFault flag for (i = 0xFF; i > 0; i--); // Time for flag to set } while ((IFG1 & OFIFG) == OFIFG); // OSCFault flag still set? BCSCTL2 |= SELM1+SELM0; // MCLK = LFXT1 (safe) TACTL = TASSEL0 + TACLR + TAIE; // ACLK, clear TAR, interrupt enabled CCTL0 = OUTMOD_4 + CCIE; // CCR0 toggle, interrupt enabled CCTL1 = OUTMOD_4 + CCIE; // CCR1 toggle, interrupt enabled CCTL2 = OUTMOD_4 + CCIE; // CCR2 toggle, interrupt enabled CCR0 = 200; CCR1 = 1000; CCR2 = 10000; P1SEL |= 0x0E; // P1.1 - P1.3 option select P1DIR |= 0x0F; // P1.0 - P1.3 outputs TACTL |= MC1; // Start Timer_A in continuous mode _EINT(); // Enable interrupts for (;;) { _BIS_SR(CPUOFF); // CPU off _NOP(); // Required only for C-spy } } // Timer A0 interrupt service routine interrupt[TIMERA0_VECTOR] void Timer_A0 (void) { CCR0 += 200; // Add Offset to CCR0 } // Timer_A3 Interrupt Vector (TAIV) handler interrupt [TIMERA1_VECTOR] void Timer_A1(void) { switch( TAIV ) { case 2: CCR1 += 1000; // Add Offset to CCR1 break; case 4: CCR2 += 10000; // Add Offset to CCR2 break; case 10: P1OUT ^= 0x01; // Timer_A3 overflow break; } }