波形问题

只看该作者 · 2014-4-23 22:37

请问像下面这样初始化EPWM模块3，输出的EPWM3A和EPWM3B的波形是怎样的？

只看该作者 · 2014-4-23 22:38

这样的
EPwm3Regs.TBPRD = 1000;                      // 20kHz
      EPwm3Regs.TBPHS.half.TBPHS = 0x0000;             // Phase is 0
      EPwm3Regs.TBCTR = 0x0000;                            // Clear counter
      EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
      EPwm3Regs.TBCTL.bit.PHSEN = TB_DISABLE;       // Disable phase loading
      EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;       // Clock ratio to SYSCLKOUT
      EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1;             // Slow just to observe on the scope
//       EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_PRD;
      EPwm3Regs.CMPA.half.CMPA =1050;//80;                               // Setup compare

      EPwm3Regs.CMPB = 1000;
            EPwm3Regs.AQCTLA.all = 0x0218; // Force PWM1A to Low
      EPwm3Regs.AQCTLB.all = 0x0018; // counter equal PRD,Force PWM3B output High