MPC5xxx中的主题 Examples on System timer module for MPC5777C

Examples on System timer module for MPC5777C

vrushalitaklika — Mon, 11 Sep 2017 05:59:07 GMT

Hi,

Is there any example or sample code on STM module for MPC5777C?

Please share

Thanks

Vrushali

Re: Examples on System timer module for MPC5777C

martin_kovar — Mon, 11 Sep 2017 10:13:39 GMT

Hello,

please check the example below. STM module used in MPC5777C is the same as in MPC5748G. Check function void STM0_ch0_init(uint32_t vSTM_CMP)

Example MPC5748G Standby mode GHS614

If you have any other question, please feel free to write me back.

Regards,

Martin

Re: Examples on System timer module for MPC5777C

martinschulthei — Thu, 14 Jun 2018 11:21:03 GMT

Hi Martin,

regarding this question, I have another one on the same topic:

RM of MPC5777C states that STM Ch1-3 share the same interrupt source (201). Is there an efficient way to handle/dispatch this interrupt. From my point of view, the only possible way is to read the interrupt flag from each channel one after another.

Is this correct or is there another possibility ?

Thanks and Best Regards,

Martin

Re: Examples on System timer module for MPC5777C

martin_kovar — Fri, 15 Jun 2018 08:28:29 GMT

Hello Martin,

yes, unfortunately, this is only possibility.

Regards,

Martin

Re: Examples on System timer module for MPC5777C

martinschulthei — Fri, 15 Jun 2018 09:11:52 GMT

Hi Martin,

many thanks for your fast response.

Unfortunately for our multicore OS this solution is not appropriate.

Can you suggest another timer module which can be used as free running timer ?

In detail we only need a free running up counter, which triggers an interrupt if an compare value is reached (same as STM).

We need a high resolution time base for e.g. task scheduling.

There are several other timer modules on the MPC577xC but I'm only familiar with the PIT module which does not fulfill the HRT requirements.

Thanks a lot and best regards

Martin

Re: Examples on System timer module for MPC5777C

martin_kovar — Fri, 15 Jun 2018 10:59:43 GMT

Hello Martin,

I am afraid STM and PIT are only timers, which are usable for your purpose. If any of these ones are not fulfill your requirements, you can check Decrementer, which is part of the core, but I am afraid, this will not be enough for you. For more information please check e200z7 core reference manual.

Regards,

Martin