Question

用dsp28335产生三个都是1kHz的pwm波，占空比为1/3，它们之间的相位差是180度，如何改下面的程序？

void InitEPwm1Example()
{

// Setup TBCLK
EPwm1Regs.TBPRD = 2000; // Set timer period 801 TBCLKs
EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm1Regs.TBCTR = 0x0000; // Clear counter

// Set Compare values
EPwm1Regs.CMPA.half.CMPA = EPWM1_MIN_CMPA; // Set compare A value
EPwm1Regs.CMPB = EPWM1_MAX_CMPB; // Set Compare B value

// Setup counter mode
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0x01; // Clock ratio to SYSCLKOUT
EPwm1Regs.TBCTL.bit.CLKDIV =0x02;

Answer 1

EPwm1Regs.TBPRD = 2000; // Set timer period 801 TBCLKs
EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm1Regs.CMPA.half.CMPA = EPWM1_MIN_CMPA; // Set compare A value

EPwm2Regs
EPwm3Regs

追问

如果是相差120度呢，求教，PHS该设置为多少，谢谢啦！