TI中文支持网我的程序是1s开通PWM，1s关断PWM，开通时PWM出现首个周期不确定（有点像随机情况），如下图：
//初始化PWM
void InitEPwm2()
{
// 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
EPwm2Regs.TBCTL.bit.PRDLD = 0;
// 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_CMPA;//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
EALLOW;
//===========================================================================
// TZA events can force EPWMxA
// TZB events can force EPWMxB
EPwm2Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWM1A will go low //故障产生时的保护
EPwm2Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWM1B will go low
EPwm2Regs.TZFRC.bit.OST = 1; // Turn off the PWM
EDIS;
}
//开通PWM代码
EALLOW;EPwm2Regs.TZCLR.bit.OST = 1;EDIS;
//关断PWM
EALLOW;
EPwm2Regs.TZFRC.bit.OST = 1;
EDIS;
1.求解是不是那个地方配置有问题？
2.TBCTR = 0，写时基寄存器，TBCTR 寄存器什么时候有效，它又没有映像寄存器？
mangui zhang：
你再找找 应该有一个初始强制高或低的寄存器位
这个可以解决你的这种随机问题
我的程序是1s开通PWM，1s关断PWM，开通时PWM出现首个周期不确定（有点像随机情况），如下图：
//初始化PWM
void InitEPwm2()
{
// 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
EPwm2Regs.TBCTL.bit.PRDLD = 0;
// 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_CMPA;//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
EALLOW;
//===========================================================================
// TZA events can force EPWMxA
// TZB events can force EPWMxB
EPwm2Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWM1A will go low //故障产生时的保护
EPwm2Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWM1B will go low
EPwm2Regs.TZFRC.bit.OST = 1; // Turn off the PWM
EDIS;
}
//开通PWM代码
EALLOW;EPwm2Regs.TZCLR.bit.OST = 1;EDIS;
//关断PWM
EALLOW;
EPwm2Regs.TZFRC.bit.OST = 1;
EDIS;
1.求解是不是那个地方配置有问题？
2.TBCTR = 0，写时基寄存器，TBCTR 寄存器什么时候有效，它又没有映像寄存器？
user1333144：
找到原因解决了吗?感觉是和OST的时间点有关系
