CCS/LAUNCHXL2-RM57L: eCAP5 module for motor speed detection

Hello,

Does the example (ecap1) work? To use ecap5, you should replace ecapREG1 in main() with ecapREG5.

Yes, I have made these modifications in my code. As far as I understand, the interrupt trigger is happening but I am getting those 13.333333 ns & 26.666666 ns values consistently.

Hi Navid,

The ecap5 (Pin H18) is multiplexed with MibSPI, DMM and MII. Please double check your pinmux configuration to make sure pin H18 is used as ECAP5.

Hi Wang,

I have made those modifications as well as can be seen in the below image.

In case of input pin muxing, I noticed there is another option available to select H18. I am not sure if that is having any effect here.

What frequencies of the input signal have you tested?

If the VCLK3=75MHz, the minimum period of the PWM output is 26.67ns. The period is Integer multiples of VCLK3 cycle: 26.67, 40, 53.33,...

Same restriction is applied to ECAP.

The input signal frequency is varying between 300 Hz to 600 Hz.