FTM Dual-Edge Input Capture

jefflfree — Fri, 02 Aug 2019 06:46:52 GMT

I am using the frdm-KV11Z board and I am specifically using the FTM to do some measurements.

I have an application where I need to sample 6 inputs consecutively with dual-edge capture mode so that I can measure the pulse width.

I have been able to get three by doing some pin muxing between each measurement. I leveraged the following code from the SDK dual-edge example:

edgeParam.mode = kFTM_Continuous;
edgeParam.currChanEdgeMode = kFTM_RisingEdge;
edgeParam.nextChanEdgeMode = kFTM_FallingEdge;
FTM_SetupDualEdgeCapture(FTM0, kFTM_Chnl_1, &edgeParam, 0);
FTM_EnableInterrupts(FTM0, kFTM_Chnl2InterruptEnable);
FTM_EnableInterrupts(FTM0, kFTM_Chnl3InterruptEnable);

Above, I am using 3 channels (1, 2, 3) to do the dual-edge capture.

However, I found that I cannot extend this to other channels combinations for FTM0 (for example: 0,1,2 or 2,3,4).

Any advice?

Jeff

Re: FTM Dual-Edge Input Capture

jefflfree — Fri, 02 Aug 2019 09:07:47 GMT

Nevermind everyone. I figured it out.

The second argument to the FTM_SetupDualEdgeCapture is the channel pair number.

Actual

Channel Channels

Pair Used

0 0,1

1 2,3

2 4,5

3 6,7

So no need to reply.

Jeff

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