MSP430F5529定时器输出SPWM

user4740510

在用MSP420F5529LP产生SPWM时周期性出现错误波形，具体波形及代码如下图所示，

#include <msp430.h>

unsigned char nCount=0;
unsigned int Sintable[] =
		{25,50,75,100,125,150,175,200,225,
		250,275,299,324,349,373,397,422,446,470,
		494,518,541,565,588,612,635,658,681,703,
		726,748,770,792,814,835,857,878,899,920,
		940,960,980,1000,1019,1039,1058,1076,1095,1113,
		1131,1149,1166,1183,1200,1216,1232,1248,1264,1279,
		1294,1309,1323,1337,1350,1364,1377,1389,1402,1414,
		1425,1436,1447,1458,1468,1478,1487,1496,1505,1513,
		1521,1529,1536,1543,1549,1555,1561,1566,1571,1576,
		1580,1584,1587,1590,1592,1595,1596,1598,1599,1599,
		1600,1599,1599,1598,1596,1595,1592,1590,1587,1584,
		1580,1576,1571,1566,1561,1555,1549,1543,1536,1529,
		1521,1513,1505,1496,1487,1478,1468,1458,1447,1436,
		1425,1414,1402,1389,1377,1364,1350,1337,1323,1309,
		1294,1279,1264,1248,1232,1216,1200,1183,1166,1149,
		1131,1113,1095,1076,1058,1039,1019,1000,980,960,
		940,920,899,878,857,835,814,792,770,748,
		726,703,681,658,635,612,588,565,541,518,
		494,470,446,422,397,373,349,324,299,275,
		250,225,200,175,150,125,100,75,50,25};


void Init_CLK(void)
{
    P1DIR |= BIT0;
    P1SEL |= BIT0;              //可以看ACLK的频率
    P2DIR |= BIT2;
    P2SEL |= BIT2;             //SMCLK
    P7DIR |= BIT7;
    P7SEL |= BIT7;             //MCLK

    P5SEL |= BIT2+BIT3;
    UCSCTL6 &= ~XT2OFF;          //打开XT2

   /*********************寄存器配置部分******************************/

    __bis_SR_register(SCG0);
    UCSCTL0 = DCO0+DCO1+DCO2+DCO3+DCO4;
    UCSCTL1 = DCORSEL_4;       //DCO频率范围在28.2MHZ以下
    UCSCTL2 = FLLD_4 + 1;       //D=16，N=1
    UCSCTL3 = SELREF_5 + FLLREFDIV_3;    //n=8,FLLREFCLK时钟源为XT2CLK；DCOCLK=D*(N+1)*(FLLREFCLK/n);DCOCLKDIV=(N+1)*(FLLREFCLK/n);
    UCSCTL4 = SELA_4 + SELS_3 +SELM_3;    //ACLK的时钟源为DCOCLKDIV,MCLK\SMCLK的时钟源为DCOCLK
    UCSCTL5 = DIVA_5;      //ACLK由DCOCLKDIV的32分频得到，SMCLK由DCOCLK的2分频得到
                //最终MCLK:16MHZ,SMCLK:8MHZ,ACLK:32KHZ

    __bic_SR_register(SCG0);                   //Enable the FLL control loop

   /**********************************************************************/

    __delay_cycles(8192);
    do
    {
     UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG); //Clear XT2,XT1,DCO fault flags
     SFRIFG1 &= ~OFIFG;       //Clear fault flags
    }while (SFRIFG1&OFIFG);
}


void Timer_A0_Init(void)
{
	P1DIR |= BIT2;
	P1SEL |= BIT2;

	TA0CCR0 = (1600 - 1);
	TA0CCTL0 = CCIE;
	TA0CCR1 = Sintable[0];
	TA0CCTL1 = OUTMOD_7;
	TA0CTL = TASSEL_2 + MC_1 + TACLR;
}

void main()
{
	WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

	Init_CLK();
	Timer_A0_Init();

	_EINT();
	while(1);
}

//#pragma vector=TIMER1_A0_VECTOR
//__interrupt void TIMER1_A0_ISR(void)
#pragma vector=TIMER0_A0_VECTOR
__interrupt void TIMER0_A0_ISR(void)
{
	nCount++;
	if(nCount >= 200)
		nCount = 0;
	TA0CCR1 = Sintable[nCount];
}

7 年多前

0 Susan Yang 7 年多前

TI__Guru**** 252096 points

附件是我们的参考设计的SPWM模块代码,您可以参考一下

全屏 3513.7343.spwm.c 下载

#include "msp430g2553.h"

#include "delay.h"

const unsigned int spwm[] = {

250, 327, 396, 452, 487, 499, 487, 452, 396, 327,

250, 172, 103, 47, 12, 0, 12, 47, 103, 172,

};

unsigned int n=0;

/*

*

*/

void TimerA_Init()

{

P1DIR |= BIT2;

P1SEL |= BIT2;                            // p1.2

TACCR0 = 500;                              // Init TACCR0 w/ sample prd=CCR0+1

TACCR1= spwm[n];

TACCTL1 = OUTMOD_7;                            // Set/reset

TACCTL0 = CCIE;

TACTL = TACLR + MC_1 + TASSEL_2 +ID_3;                // clear TAR, up mode*/

}

void ini_sys(void)

{

   WDTCTL=WDTPW+WDTHOLD;  //STOP W D T

   if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)

   	{

   	 while(1);                               // If calibration constants erased

   	 // do not load, trap CPU!!

   	}

   	 //1Mhz  ~1008000

   	BCSCTL1 = CALBC1_16MHZ;                    // Set range

   	DCOCTL = CALDCO_16MHZ;                     // Set DCO step + modulation */

   	delay_ms(10);

}

/*

* main()

*/

void main()

{

   ini_sys();

   TimerA_Init();

   _EINT();

 //_BIS_SR(LPM0_bits + GIE);

   while(1);

}

/*

*	T0_A0 interrupt service

*/

#pragma vector=TIMER0_A0_VECTOR

__interrupt void Timer0_A0(void)

{

//һ��������ȡ180���㣬����2��

TACCR1 = spwm[n++];

if(n == 20)
{

n=0;

}

}