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F28069 eCap problem

Chi Min Tseng
Intellectual 360 points

Hi! I used F28069 MCU

I have a problem. How to control the eCap module?

Here's the code:

ECap1Regs.ECCTL2.bit.CAP_APWM = 1; // Enable APWM mode
ECap1Regs.TSCTR = 0;
ECap1Regs.CAP1 = 3000;//1500;//0x01312D00; // Set Period value // 90,000,000/3,000 = 300,000
ECap1Regs.CAP2 = i;//0x00989680; // Set Compare value
// Start counters
ECap1Regs.ECCTL2.bit.TSCTRSTOP = 1;

When this code execute, I can see the waveform in Oscilloscope.

But when I want the waveform to always low level.

I set

ECap1Regs.CAP1 = 0;
ECap1Regs.CAP2 = 0;

The waveform dosen't happen. 

How to set the value and it can make waveform always low.

Can anyone help me?

Thanks!