智能车制作

标题: 求个K60的PWM波形输出例程 [打印本页]

作者: 曲面积分 时间: 2013-7-12 16:40
标题: 求个K60的PWM波形输出例程
我想拿去研究一下最好是codewarrior的例程多谢各位大神

作者: wzp1992 时间: 2013-7-21 16:58
void PWM_INIT(void)
{
  SIM_SCGC6 |= SIM_SCGC6_FTM0_MASK; //使能FTM0时钟
  FTM0_C0SC |= FTM_CnSC_ELSB_MASK;
  FTM0_C0SC &= ~FTM_CnSC_ELSA_MASK;//clear output on match
  FTM0_C0SC |= FTM_CnSC_MSB_MASK;//·边沿对齐模式
  SIM_SCGC5 |= SIM_SCGC5_PORTC_MASK;
  PORT_PCR_REG(PORTC_BASE_PTR, 1) = PORT_PCR_MUX(4);  // PTC1,输出到电机PWM

  FTM0_C1SC |= FTM_CnSC_ELSB_MASK;
  FTM0_C1SC &= ~FTM_CnSC_ELSA_MASK;//clear output on match
  FTM0_C1SC |= FTM_CnSC_MSB_MASK;//边沿对齐模式
  SIM_SCGC5 |= SIM_SCGC5_PORTC_MASK;
  PORT_PCR_REG(PORTC_BASE_PTR, 2) = PORT_PCR_MUX(4);  // PTC2,输出到电机PWM

  FTM0_SC = FTM_SC_PS(0) | FTM_SC_CLKS(1);//not enable the interrupt mask,select system clock，上升模式
                     //divide by 1 50MHz
  FTM0_MODE &= ~3;    //BIT0 FTM Enable
  FTM0_MODE |= 0x04;
  FTM0_OUTMASK &= ~3;  //0 Channel output is not masked. It continues to operate normally.
  FTM0_COMBINE=0;    //Function for Linked Channels (FTMx_COMBINE)
  FTM0_OUTINIT=0;
  FTM0_EXTTRIG=0;    //FTM External Trigger (FTMx_EXTTRIG)
  FTM0_POL=0;       //Channels Polarity (FTMx_POL)
                        //0 The channel polarity is active high.
                        //1 The channel polarity is active low.

  FTM0_INVCTRL=0;    //反转控制
  FTM0_SWOCTRL=0;    //软件输出控制F TM Software Output Control (FTMx_SWOCTRL)
  FTM0_PWMLOAD=0;    //FTM PWM Load
                  //BIT9: 0 Loading updated values is disabled.
                  //1 Loading updated values is enabled.
  FTM0_CNTIN=0;    //Counter Initial Value
  FTM0_MOD=5000;    //Modulo value,The EPWM period is determined by (MOD - CNTIN + 0x0001)
                  //PMW频率=50000000/5000=5000HZ
  FTM0_C0V=0;    //设置 the pulse width(duty cycle) is determined by (CnV - CNTIN).
  FTM0_C1V=0;    //设置 the pulse width(duty cycle) is determined by (CnV - CNTIN).
  FTM1_CNT=0;       //只有低16位可用
                  //PMW频率=50000000/5000=5000HZ



  SIM_SCGC3 |= SIM_SCGC3_FTM2_MASK;//使能FTM2时钟
  FTM2_C0SC |= FTM_CnSC_ELSB_MASK;
  FTM2_C0SC &= ~FTM_CnSC_ELSA_MASK;//clear output on match
  FTM2_C0SC |= FTM_CnSC_MSB_MASK;//边沿对齐模式
  SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK;
  PORT_PCR_REG(PORTB_BASE_PTR, 18) = PORT_PCR_MUX(3);  // PTB18,舵机PWM

  FTM2_SC = FTM_SC_PS(7) | FTM_SC_CLKS(1);//not enable the interrupt mask,select system clock，上升模式
                     //divide by 128 195312.5Hz
  FTM2_MODE &= ~3;    //BIT0 FTM Enable
  FTM2_OUTMASK &= ~3;  //0 Channel output is not masked. It continues to operate normally.
  FTM2_COMBINE=0;    //Function for Linked Channels (FTMx_COMBINE)
  FTM2_OUTINIT=0;
  FTM2_EXTTRIG=0;    //FTM External Trigger (FTMx_EXTTRIG)
  FTM2_POL=0;       //Channels Polarity (FTMx_POL)
                        //0 The channel polarity is active high.
                        //1 The channel polarity is active low.

  FTM2_INVCTRL=0;    //反转控制
  FTM2_SWOCTRL=0;    //软件输出控制F TM Software Output Control (FTMx_SWOCTRL)
  FTM2_PWMLOAD=0;    //FTM PWM Load
                  //BIT9: 0 Loading updated values is disabled.
                  //1 Loading updated values is enabled.
  FTM2_CNTIN=0;    //Counter Initial Value
  FTM2_MOD=8000;    //Modulo value,The EPWM period is determined by (MOD - CNTIN + 0x0001)
                  //PMW频率=195312.5/4000=50HZ
  FTM2_C0V=610;//545~675
}

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