TI中文支持网怎样才能将ePWM关掉，并且将PWM2A，PWM2B置为低电平，我是采样关时钟来将PWM关掉，但关闭后，PWM2A为低，而PWM2B一直为高，求解决方法？
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
EDIS;
InitEPwm2Example();
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;
void InitEPwm2Example()
{
// Setup TBCLK
EPwm2Regs.TBPRD =EPWM2_TIMER_TBPRD; //600; // Set timer period 801 TBCLKs
EPwm2Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
// Set Compare values
EPwm2Regs.CMPA.half.CMPA = EPWM2_MIN_CMPA;//324;//; // Set compare A value
EPwm2Regs.CMPB = EPWM2_MIN_CMPB;//276;//; // Set Compare B value
// Setup counter mode
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;//0x0-1分频,TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)
// Setup shadowing
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
// Action Qualifier SubModule Registers
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;//AQ_CLEAR;
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;//AQ_SET;
EPwm2Regs.AQCTLB.bit.CBU = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.CBD = AQ_SET;
// Interrupt where we will change the Compare Values
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTRD_CMPB;//ET_CTR_ZERO; // Select INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
}
Joey Mao：
你可以使用AQSFRC寄存器的ACTSFA和ACTSFB，使PWMnA和B保持高或低的状态
怎样才能将ePWM关掉，并且将PWM2A，PWM2B置为低电平，我是采样关时钟来将PWM关掉，但关闭后，PWM2A为低，而PWM2B一直为高，求解决方法？
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
EDIS;
InitEPwm2Example();
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;
void InitEPwm2Example()
{
// Setup TBCLK
EPwm2Regs.TBPRD =EPWM2_TIMER_TBPRD; //600; // Set timer period 801 TBCLKs
EPwm2Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
// Set Compare values
EPwm2Regs.CMPA.half.CMPA = EPWM2_MIN_CMPA;//324;//; // Set compare A value
EPwm2Regs.CMPB = EPWM2_MIN_CMPB;//276;//; // Set Compare B value
// Setup counter mode
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;//0x0-1分频,TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)
// Setup shadowing
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
// Action Qualifier SubModule Registers
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;//AQ_CLEAR;
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;//AQ_SET;
EPwm2Regs.AQCTLB.bit.CBU = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.CBD = AQ_SET;
// Interrupt where we will change the Compare Values
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTRD_CMPB;//ET_CTR_ZERO; // Select INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
}
mangui zhang：
你可以不用关闭时钟的方法 你可以强制输出高或低
应该就能满足你的要求
怎样才能将ePWM关掉，并且将PWM2A，PWM2B置为低电平，我是采样关时钟来将PWM关掉，但关闭后，PWM2A为低，而PWM2B一直为高，求解决方法？
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
EDIS;
InitEPwm2Example();
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;
void InitEPwm2Example()
{
// Setup TBCLK
EPwm2Regs.TBPRD =EPWM2_TIMER_TBPRD; //600; // Set timer period 801 TBCLKs
EPwm2Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
// Set Compare values
EPwm2Regs.CMPA.half.CMPA = EPWM2_MIN_CMPA;//324;//; // Set compare A value
EPwm2Regs.CMPB = EPWM2_MIN_CMPB;//276;//; // Set Compare B value
// Setup counter mode
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;//0x0-1分频,TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)
// Setup shadowing
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
// Action Qualifier SubModule Registers
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;//AQ_CLEAR;
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;//AQ_SET;
EPwm2Regs.AQCTLB.bit.CBU = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.CBD = AQ_SET;
// Interrupt where we will change the Compare Values
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTRD_CMPB;//ET_CTR_ZERO; // Select INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
}
Joey Mao：
回复 mangui zhang:
是的，通常是用强制高或低的方法，也就是我前面所说的寄存器的作用
