28335输出PWM波形求指导！

只看该作者 · 2015-4-9 11:02

本帖最后由草上之风于 2015-4-9 11:04 编辑

各位前辈，小白想用28335输出PWM给驱动器驱动步进电机，编译过了，可是动不了，不知道哪里有问题求指导！！或者直接给一个能输出PWM的28335的工程也许啊！！
多谢啦~~

这个是配置PWM程序
#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"

#if (CPU_FRQ_150MHZ)
  #define CPU_CLK 150e6
#endif
#if (CPU_FRQ_100MHZ)
  #define CPU_CLK 100e6
#endif
#define PWM_CLK 10e3             // If diff freq. desired, change freq here.
#define SP       CPU_CLK/(2*PWM_CLK)
#define TBCTLVAL  0x200E          // Up-down cnt, timebase = SYSCLKOUT

void EPwmSetup()
{
//  InitEPwm1Gpio();
InitEPwm();
      EPwm1Regs.TBSTS.all=0;
      EPwm1Regs.TBPHS.half.TBPHS=0;
      EPwm1Regs.TBCTR=0;

      EPwm1Regs.CMPCTL.all=0x50;       // Immediate mode for CMPA and CMPB
      EPwm1Regs.CMPA.half.CMPA =400;
      EPwm1Regs.CMPB=0;

      EPwm1Regs.AQCTLA.all=0x60;       // EPWMxA = 1 when CTR=CMPA and counter inc
                                                            // EPWMxA = 0 when CTR=CMPA and counter dec
      EPwm1Regs.AQCTLB.all=0;
      EPwm1Regs.AQSFRC.all=0;
      EPwm1Regs.AQCSFRC.all=0;

      EPwm1Regs.DBCTL.all=0xb;       // EPWMxB is inverted
      EPwm1Regs.DBRED=0;
      EPwm1Regs.DBFED=0;

      EPwm1Regs.TZSEL.all=0;
      EPwm1Regs.TZCTL.all=0;
      EPwm1Regs.TZEINT.all=0;
      EPwm1Regs.TZ标志寄存器.all=0;
      EPwm1Regs.TZCLR.all=0;
      EPwm1Regs.TZFRC.all=0;

      EPwm1Regs.ETSEL.all=0;          // Interrupt when TBCTR = 0x0000
      EPwm1Regs.ET标志寄存器.all=0;
      EPwm1Regs.ETCLR.all=0;
      EPwm1Regs.ETFRC.all=0;

      EPwm1Regs.PCCTL.all=0;

      EPwm1Regs.TBCTL.all=0x0010+TBCTLVAL;                      // Enable Timer
      EPwm1Regs.TBPRD=SP;

}

这个是输出PWM主程序

#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"

void EPwmSetup();

Uint16  i;

void main(void)
{

InitSysCtrl();
InitXintf16Gpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();

EALLOW;

GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; // Enable pull-up on GPIO18 驱动器方向控制信号
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;    // Enable pull-up on GPIO19  驱动器空转信号
GpioDataRegs.GPASET.bit.GPIO18 = 1;    // Load output latch

GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 0;   // Configure GPI18 as IO
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 0; // Configure GPI19 as IO

GpioCtrlRegs.GPADIR.bit.GPIO18 = 1; // GPIO18 = output
      GpioCtrlRegs.GPADIR.bit.GPIO19 = 1; // GPIO19 = output

EDIS;

      EPwmSetup();

for(; ;)
{

}

}