KL16Z Adjusting TPM duration through DMA

turtius — Sat, 12 Jun 2021 14:38:51 GMT

Hello, I have setup TPM for PWM which is center aligned. Now for my application i needed to change the frequency with a given duration and that was done by updating the MOD register and using a timer to stop the pulse when the duration was reached by clearing the MOD register but this consumed far too many cycles so i started looking at DMA .So regarding the subject, is there a way to set the duration of the pulse through DMA so that the buffer does not need to hold every single pulse?

Re: KL16Z Adjusting TPM duration through DMA

nxf56274 — Tue, 15 Jun 2021 02:04:45 GMT

Hi,

You do not need DMA. From this picture, CMOD[1:0] != 0:0, you use the CPWM mod. So you can directly write the new MOD value. The value will stored in buffer. When the counter changes from MOD to MOD-1, the MOD will updated from buffer. And your duration is also changed.

Have a great day,
TIC

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topic Re: KL16Z Adjusting TPM duration through DMA in Kinetis Microcontrollers

KL16Z Adjusting TPM duration through DMA

Re: KL16Z Adjusting TPM duration through DMA