f2812用比较单元实现pwm波输出问题，请帮忙？？

tosstaryt

f2812用比较单元实现pwm波输出问题，请帮忙？？ [复制链接]

我用f2812的比较单元实现pwm输出有问题，我的对寄存器初始化代码如下面所示，这里我采用比较单元输出pwm波的同时，也采用了通用定时器1的比较输出，在运行程序时，通用定时器的比较输出是正常的，但是用比较单元pwm输出引脚没现象！郁闷，请高手指点，是不是哪里设置有问题？？？

EALLOW;
GpioMuxRegs.GPAMUX.bit.T1PWM_GPIOA6 = 0x0ff;//使能通用时钟1比较输出引脚
EDIS;

EvaRegs.GPTCONA.bit.TCOMPOE = 1;
EvaRegs.GPTCONA.bit.T1PIN = 1;
EvaRegs.T1PR = 32763;//时钟1的周期值为T1PR + 1
EvaRegs.T1CMPR = 10000; //比较值设置

//比较单元寄存器初始化
EvaRegs.CMPR1 = 32763;
EvaRegs.CMPR2 = 32763;
EvaRegs.CMPR2 = 32763;
EvaRegs.ACTR.all = 0x0666;
EvaRegs.DBTCONA.all = 0;
EvaRegs.COMCONA.all = 0xA6E0;

EvaRegs.T1CNT = 0;                //通用时钟1计数值置为0
EvaRegs.T1CON.all = 0X1742;
//时钟1控制，采用连续递增方式，预定标为128，内部时钟，使能比较，使用自己的周期值
EvaRegs.T1CON.bit.TENABLE = 0; //先关时钟，在后面再开
EvaRegs.T1CON.bit.TCLD10 = 1;

xubingnihao

上面有条语句错误GpioMuxRegs.GPAMUX.bit.T1PWM_GPIOA6 = 0x0ff
改为GpioMuxRegs.GPAMUX.all = 0x0ff
但结果还是一样啊！请高手帮忙啊！

putian

已经解决

jwj

怎么解决的?我的都没输出

jbcfelix

我使用的是TI的PWM例程.如下.请cbl20020825帮我看看.别人试了是好的,但在我的板子上却不行.总没有输出.


#include \"DSP281x_Device.h\"     // DSP281x Headerfile Include File
#include \"DSP281x_Examples.h\"   // DSP281x Examples Include File



void init_eva(void);
void init_evb(void);




void main(void)
{


   InitSysCtrl();


   EALLOW;
   // Enable PWM pins
   GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6  pins
   GpioMuxRegs.GPBMUX.all = 0x00FF; // EVB PWM 7-12 pins
   EDIS;
   

// Disable CPU interrupts
   DINT;


   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;


// Service Routines (ISR).  

   InitPieVectTable();
   

   init_eva();
   init_evb();

       
  for(;;

}

void init_eva()
{

// EVA Configure T1PWM, T2PWM, PWM1-PWM6
// Initalize the timers
   // Initalize EVA Timer1
   EvaRegs.T1PR = 0xFFFF;       // Timer1 period
   EvaRegs.T1CMPR = 0x3C00;     // Timer1 compare
   EvaRegs.T1CNT = 0x0000;      // Timer1 counter
   // TMODE = continuous up/down
   // Timer enable
   // Timer compare enable
   EvaRegs.T1CON.all = 0x1042;   


  // Initalize EVA Timer2
  EvaRegs.T2PR = 0x0FFF;       // Timer2 period
  EvaRegs.T2CMPR = 0x03C0;     // Timer2 compare
  EvaRegs.T2CNT = 0x0000;      // Timer2 counter
  // TMODE = continuous up/down
  // Timer enable
  // Timer compare enable
  EvaRegs.T2CON.all = 0x1042;   


  // Setup T1PWM and T2PWM
  // Drive T1/T2 PWM by compare logic
  EvaRegs.GPTCONA.bit.TCMPOE = 1;
  // Polarity of GP Timer 1 Compare = Active low
  EvaRegs.GPTCONA.bit.T1PIN = 1;
  // Polarity of GP Timer 2 Compare = Active high
  EvaRegs.GPTCONA.bit.T2PIN = 2;

  // Enable compare for PWM1-PWM6
  EvaRegs.CMPR1 = 0x0C00;
  EvaRegs.CMPR2 = 0x3C00;
  EvaRegs.CMPR3 = 0xFC00;
   
  // Compare action control.  Action that takes place
  // on a cmpare event
  // output pin 1 CMPR1 - active high
  // output pin 2 CMPR1 - active low
  // output pin 3 CMPR2 - active high
  // output pin 4 CMPR2 - active low
  // output pin 5 CMPR3 - active high
  // output pin 6 CMPR3 - active low
  EvaRegs.ACTRA.all = 0x0666;
  EvaRegs.DBTCONA.all = 0x0000; // Disable deadband
  EvaRegs.COMCONA.all = 0xA600;


}

void init_evb()
{

// EVB Configure T3PWM, T4PWM and PWM7-PWM12
// Step 1 - Initialize the Timers

  // Initialize EVB Timer3
  // Timer3 controls T3PWM and PWM7-12
  EvbRegs.T3PR = 0xFFFF;       // Timer3 period
  EvbRegs.T3CMPR = 0x3C00;     // Timer3 compare
  EvbRegs.T3CNT = 0x0000;      // Timer3 counter
  // TMODE = continuous up/down
  // Timer enable
  // Timer compare enable
  EvbRegs.T3CON.all = 0x1042;   

  // Initialize EVB Timer4
  // Timer4 controls T4PWM
  EvbRegs.T4PR = 0x00FF;       // Timer4 period
  EvbRegs.T4CMPR = 0x0030;     // Timer4 compare
  EvbRegs.T4CNT = 0x0000;      // Timer4 counter
  // TMODE = continuous up/down
  // Timer enable
  // Timer compare enable
  EvbRegs.T4CON.all = 0x1042;   

  // Setup T3PWM and T4PWM
  // Drive T3/T4 PWM by compare logic
  EvbRegs.GPTCONB.bit.TCMPOE = 1;
  // Polarity of GP Timer 3 Compare = Active low
  EvbRegs.GPTCONB.bit.T3PIN = 1;
  // Polarity of GP Timer 4 Compare = Active high
  EvbRegs.GPTCONB.bit.T4PIN = 2;

  // Enable compare for PWM7-PWM12
  EvbRegs.CMPR4 = 0x0C00;
  EvbRegs.CMPR5 = 0x3C00;
  EvbRegs.CMPR6 = 0xFC00;
   
  // Compare action control.  Action that takes place
  // on a cmpare event
  // output pin 1 CMPR4 - active high
  // output pin 2 CMPR4 - active low
  // output pin 3 CMPR5 - active high
  // output pin 4 CMPR5 - active low
  // output pin 5 CMPR6 - active high
  // output pin 6 CMPR6 - active low
  EvbRegs.ACTRB.all = 0x0666;
  EvbRegs.DBTCONB.all = 0x0000; // Disable deadband
  EvbRegs.COMCONB.all = 0xA600;
}





[ 本贴由 blue-sky 于 2007-8-9 10:47 PM 最后编辑 ]

附件

Example_281xEvPwm.c (6.34 KB)

2007-8-9 14:44, 下载次数: 111

附件

Example_281xEvPwm.c (6.34 KB)

2007-8-9 14:44, 下载次数: 111

zephyry

设置应该没问题啊，如果是例程的话，你可以找找技术支持一下！还有个方法测试是你的软件问题还是硬件问题，就是使能比较中断，周期中断等等，如果软件设置没问题而是硬件问题以至没输出去的话，那一定能进入中断的，！而且你可以将pwm输出引脚设为通用IO口，进行编程输出，看现象如何？？？

傻傻天子

谢谢cbl20020825.我的问题已经解决.是/PDPINTA引脚没接好,拉低禁止了PWM的输出.

wdwcymwjy

不客气，没帮上忙！