1、配置如下，以PWM1为基准，PMW2移相120，PWM3移相240
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
EDIS;
InitEPwm1Example();
InitEPwm2Example();
InitEPwm3Example();
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;
//PWM1初始化
void InitEPwm1Example()
{
EPwm1Regs.TBPRD = 299; // 200K
EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm1Regs.TBCTR = 0x0000; // Clear counter
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;// 3T
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; //4T 同步顺流TB_SYNC_IN
// Setup TBCLK
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; //T Count up
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // 1t主模式
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; // Load registers every ZERO
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
// Setup compare
EPwm1Regs.CMPA.half.CMPA = 100;
// Set actions
EPwm1Regs.AQCTLA.bit.ZRO= AQ_SET;//180412
EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero
// Active Low PWMs - Setup Deadband
/* EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE;
EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_LO;
EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL;
EPwm1Regs.DBRED = EPWM1_MIN_DB;
EPwm1Regs.DBFED = EPWM1_MIN_DB;
EPwm1_DB_Direction = DB_UP;*/
// Interrupt where we will change the Deadband
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm1Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
}
//pwm2初始化
void InitEPwm2Example()
{
EPwm2Regs.TBPRD = 299; // Set timer period
EPwm2Regs.TBPHS.half.TBPHS = 300-100; //2T Phase is 120
EPwm2Regs.TBCTR = 0x0000; // Clear counter
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;// 3T
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; //4T TB_CTR_ZERO TB_SYNC_IN
// Setup TBCLK
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; //T Count up
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; //1T 从模式TB_DISABLE
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1; // Slow just to observe on the scope
// Setup compare
EPwm2Regs.CMPA.half.CMPA = 100;
// Set actions
EPwm2Regs.AQCTLA.bit.ZRO= AQ_SET;//180412
EPwm2Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM2A on Zero
// Interrupt where we will modify the deadband
EPwm2Regs.ETSEL.bit.INTSEL = 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
}
//pwm3初始化
void InitEPwm3Example()
{
EPwm3Regs.TBPRD = 299; // Set timer period
EPwm3Regs.TBPHS.half.TBPHS = 300-200; // Phase is 240
EPwm3Regs.TBCTR = 0x0000; // Clear counter
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW;// 3T
EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; //4T TB_CTR_ZERO TB_SYNC_IN
// Setup TBCLK
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; //T Count up
EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Disable phase loading
EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1; // Slow so we can observe on the scope
// Setup compare
EPwm3Regs.CMPA.half.CMPA = 100;
// Set actions
EPwm3Regs.AQCTLA.bit.ZRO= AQ_SET;//180412
EPwm3Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM3A on Zero
// EPwm3Regs.AQCTLB.bit.CAU = AQ_CLEAR; // Set PWM3A on Zero
// EPwm3Regs.AQCTLB.bit.CAD = AQ_SET;
// Interrupt where we will change the deadband
EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm3Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm3Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
}
以上初始化完毕后，在其它地方没有PWM做任何更改，然后主main程序for循环
正常情况1：pwm1/2/3能够正常发板，pwm2移相120，pwm3移相240
for(;;)
{
asm(" NOP");
}
异常情况2：在中断中，对TBPRD重新再次赋值一次，pwm1能够正常发板，pwm2不能发波，pwm3正常发波，移相240
interrupt void epwm1_isr(void)
{
EPwm1Regs.TBPRD = 299;
EPwm2Regs.TBPRD = 299; 不发波
EPwm3Regs.TBPRD = 299;
EPwm1TimerIntCount++;
EPwm1Regs.ETCLR.bit.INT = 1;
// Acknowledge this interrupt to receive more interrupts from group 3
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
}
请问各位大侠，为什么在中断更新TBPRD一次后，PWM2就不能发波了，更别提移相了。但是pwm3正常。移相需要额外配置啥嘛？
