topic Re: CAN Timestamp in Model-Based Design Toolbox (MBDT)

CAN Timestamp

fernando_barrio — Wed, 10 Apr 2019 17:27:55 GMT

Hi,

I am trying to create a function that will check when the last CAN message was received, and if it has not been received within x amount of time an action will be take. My question is how do I get the current time, to be able to see the difference between the CAN Timestamp and current time? Also is this timestamp in seconds?

Thank you in advance,

Fernando

Re: CAN Timestamp

Daniel_Popa — Wed, 19 Jun 2019 07:21:43 GMT

constantinrazvan.chivu‌,

Please have a look over this. Is it still an issue ?

Re: CAN Timestamp

constantinrazva — Wed, 19 Jun 2019 08:58:49 GMT

Hello fernando.barrios@uwaterloo.ca‌, dumitru-daniel.popa‌,

Sorry for the delayed answer on this topic, I missed it; I think it was answered here . To answer the question, here is the output of the CAN block:

This timestamp is part of the MB structure (2B long), and is a value that the free running timer returns.

The TIMER_SRC bit (from CAN_CTRL2) is negated, thus the free running timer is clocked by the CAN bit-clock (the one that defines the baud rate on the CAN bus). This timer increments by one after each bit (received/transmitted); when there is no message on the bus, it counts using the programmed baud rate.

You can find out more details in the reference manual, in FlexCAN -> Functional description -> CAN protocol related features -> Timestamp.

Kind regards,

Razvan.

Re: CAN Timestamp

fernando_barrio — Thu, 20 Jun 2019 02:52:58 GMT

Hi constantinrazvan.chivu‌,

Yes you did answer it on my other post, this explanation is helpful though I really appreciate it.

Thank you,

Fernando