S32KのトピックRe: S32K3xx - media clock timestamping using PPS0 input

S32K3xx - media clock timestamping using PPS0 input

jakub_mielczare — Mon, 06 Jun 2022 10:08:35 GMT

Hello,

In S32K3 RM, in chapter "73.17.167 MAC PPS Control (MAC_PPS_Control)" it says that PPS0 can be used to capture presentation time at rising/falling/both edge of a media clock.

But the same values of PPSCTRL_PPS CMD are used also above in the manual:

How is it defined which of the above value sets are effective, pulse train or timestamp capture on edge?

Thank you,

Jakub

Re: S32K3xx - media clock timestamping using PPS0 input

Shuang — Thu, 09 Jun 2022 08:14:50 GMT

Hi Jakub,

The attachment is a draft version of PPS user guide. You can refer to it.

BR,

Shuang

Re: S32K3xx - media clock timestamping using PPS0 input

jakub_mielczare — Mon, 29 Aug 2022 15:34:59 GMT

Hi,

Thank you for the answer and the PPT file.

Is it possible to read timestamps from MAC PPS0 Target Time registers (written by MAC on capturing rising/falling edge of an external clock signal) by CPU or only DMA can make those reads?

Thank you,

Jakub

Re: S32K3xx - media clock timestamping using PPS0 input

jakub_mielczare — Tue, 13 Sep 2022 11:43:29 GMT

Hello. Is there any update here?

Re: S32K3xx - media clock timestamping using PPS0 input

jakub_mielczare — Tue, 13 Sep 2022 11:44:27 GMT

Hello,

Is there any update in this topic?

Re: S32K3xx - media clock timestamping using PPS0 input

Shuang — Wed, 14 Sep 2022 03:23:33 GMT

Hi Jakub,CPU and DMA can read&write MAC PPS0 Target Time registers. DMA can reduce CPU loading and it is recommended for operation.

The attachment is a demo project that DMA will write data to MAC PPS0 Target Time registers and will generate media clock.

BR,

Shuang