TMS320C6678: How to make nano second precision Timer and Clock module

Kyungbin Lee

Part Number: TMS320C6678
Other Parts Discussed in Thread: SYSBIOS

Hi.

Currently, I'm using the TMS320c6678-EVM board to implemente user logic. I am using SysBios, and through several examples, I learned how to create a micro second timer or clock module in sysbios.

The logic I am currently implementing consists of 1 Timer Module and 1 Clock Module. What I want to do is to create Timer and Clock modules that run with a period of 138.892us each.

There are many examples of Timer and Clock modules with units of us, but I can't find a way to make Timer and Clock modules with precision of units of ns.

The DSP core frequency is 1Ghz. With that frequency, it is thought that it will be possible to create a Clock and Timer module with a precision of nano second on the EVM board.

I need some usable examples or advice in this issue, so please help.

over 2 years ago

0 Shankari G over 2 years ago

TI__Mastermind 25535 points

Kyungbin Lee

Yes, it is ofcourse possible to do the timer and clock modules of ns precision

Please have a look at the code given in this FAQ : - https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1117651/faq-tms320c6678-how-to-utilize-the-clock-ticks-to-measure-the-time-taken-for-the-code-execution

And let us know, how it goes for you.

----

While, you go through the above code in the FAQ, Please focus on this explanation.

Time = 1 / Freq ( General formula )

= 1 / 1000 MHz ( DSP core frequency )

= 0.001 us ( Micro seconds) ---> equal to one nano second = 1 NANO second.

---

Regards

Shankari G

0 Kyungbin Lee over 2 years ago in reply to Shankari G

Prodigy 20 points

Shankari G

Thanks for providing the link. But, unfortunately I still don't know the exact way to make a Timer or Clock module with nano second precision. The information in the link seems to be a way to find out the execution cycle of a function in units of nano seconds using Timestamp.

Can you tell me more specific way to make Clock module or Timer module with nano second precision or provide example source code?
- Clock or Timer module continuously performed at 139.889ns cycle

0 Rajarajan Uthayakumar over 2 years ago in reply to Kyungbin Lee

TI__Expert 4314 points

Hi Kyungbin Lee,

Timer usage in SYSBIOS is explained in the training video: TI-RTOS - TIMER.

SYSBIOS HAL Timer API documentation can be found in HAL Timer API and SYSBIOS User guide (Sections 5.2 and 5.3).

CSL Timer APIs can also be found at "file:///C:/ti/pdk_c667x_2_0_16/packages/ti/csl/docs/doxygen/html/group___c_s_l___t_i_m_e_r.html" .which comes along with TI-RTOS SDK

Thanks & Regards,

Rajarajan U

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TMS320C6678: How to make nano second precision Timer and Clock module