求一个定时器B的pwm例程

只看该作者 · 2018-10-24 20:27

#include "msp430x54x.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P1DIR |= 0x01;                         // Set P1.0 to output direction
  TBCTL = TBSSEL_1 + MC_2 + TBCLR + TBIE; // ACLK, contmode, clear TBR,
                                          // enable interrupt

  __bis_SR_register(LPM3_bits + GIE);    // Enter LPM3, enable interrupts
  __no_operation();                      // For debugger
}

// Timer_B7 Interrupt Vector (TBIV) handler
#pragma vector=TIMERB1_VECTOR
__interrupt void TIMERB1_ISR(void)
{
  /* Any access, read or write, of the TBIV register automatically resets the
  highest "pending" interrupt flag. */
  switch( __even_in_range(TBIV,14) )
  {
case  0: break;                         // No interrupt
case  2: break;                         // CCR1 not used
case  4: break;                         // CCR2 not used
case  6: break;                         // CCR3 not used
case  8: break;                         // CCR4 not used
case 10: break;                         // CCR5 not used
case 12: break;                         // CCR6 not used
case 14: P1OUT ^= 0x01;                // overflow
         break;
default: break;
  }
}

只看该作者 · 2018-10-24 20:30

void main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
FLL_CTL0 |= XCAP14PF;                // 匹配14pf电容
__delay_cycles(20000);                   //延时20ms，等待晶振起振稳定

do
{
   IFG1 &= ~OFIFG;
   for(unsigned int i=5000;i>0;i--);
}
while(IFG1&OFIFG);

TACTL |= TASSEL_1 + MC_1 + TACLR;
TACCR0 = 32767;                         //T=1s
TACCTL1 |= OUTMOD_7;
TACCR1 = 19661;                         //占空比60%

P1DIR |= 0x04;
P1SEL |= 0x04;
while(1);
}

只看该作者 · 2018-10-24 20:31

void main()
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
ClkInit();

TAPwmInit('A',1,'P','P'); //将定时器TA初始化成为PWM发生器
               //时钟源=ACLK ; 无分频;  通道1和通道2均设为高电平模式。
TAPwmSetPeriod(500);       //通道1/2的PWM方波周期均设为500个时钟周期
TAPwmSetDuty(1,200);       //1通道有效200个时钟周期
TAPwmSetPermill(2,200);    //2通道 20.0%

LPM0;
}

只看该作者 · 2018-10-24 20:33

5529舵机的PWM信号控制的程序吗？

只看该作者 · 2018-10-24 20:34

设定一个变量来选择初始占空比，然后通过Timer_B定时1s，每隔一秒

只看该作者 · 2018-10-24 20:37

TB可以输出6路完整的PWM波形。

只看该作者 · 2018-10-24 20:38

void main(void)
{

  WDTCTL = WDTPW + WDTHOLD; // Stop WDT

P1DIR |= 0x0C; // P1.2 and P1.3 output
P1SEL |= 0x0C; // P1.2 and P1.3 TA1/2 options

Init_TIMER_B();

TACTL = TASSEL_2 + TACLR; // SMCLK, up mode

CCR0 = 512-1; // PWM Period
CCTL1 = OUTMOD_7 ; // CCR1 reset/set
CCTL2 = OUTMOD_7 ; //CCR2 reset/set
if(v==5)
{
   CCR1 = 128; // CCR1 PWM duty cycle
   CCR2 = 384; // CCR2 PWM duty cycle
}
else if (v==12)
{
   CCR1 = 384; // CCR1 PWM duty cycle
   CCR2 = 128; // CCR2 PWM duty cycle
}
else
{
   CCR1 = 128; // CCR1 PWM duty cycle
   CCR2 = 384; // CCR2 PWM duty cycle
}

TACTL |= MC_1;    // Start Timer_A in up mode
TBCTL |= MC_1;    // Start Timer_B in up mode

_EINT();       //开全局中断
_BIS_SR(LPM0_bits); // Enter LPM0

}

void  Init_TIMER_B()
{
TBCTL |= TBSSEL0 +TBCLR; //ACLK
TBCCTL0 = CCIE;
TBCCR0 =32768;  //定时1s
}