CCS/TMS320F28335: How to check if sysclkout in f28335 150 or 100MHz?

Ankit Gupta6

Part Number: TMS320F28335

Tool/software: Code Composer Studio

Hi,

I am having a really basic confusion. How do I check if my processor is operating at 100MHz or 150MHz?

I need to make the LSPCLK as fast as possible for high-speed SCI communication. I understand that the maximum frequency of LSPCLK at 100MHz is 100MHz and at 150MHz is 75 MHz.

-Ankit

over 8 years ago

0 Vivek Singh over 8 years ago

TI__Guru** 115271 points

Ankit,

You can setup GPIO pinmux to bring XLKOUT on GPIO pin and measure the frq of the same and then calculate SYSCLKOUT frq.

Regards,
Vivek Singh

0 Vivek Singh over 8 years ago in reply to Vivek Singh

TI__Guru** 115271 points

Please refer section "5.2.3 XCLKOUT Generation" of System Control document of this device for more detail about XCLKOUT generation.

Vivek Singh

0 Ankit Gupta6 over 8 years ago in reply to Vivek Singh

Intellectual 565 points

Thank you for the prompt reply.

I had an additional question.
How can i change the system clock frequency of my controller from 150MHz to 100MHz?

-Ankit

0 Vivek Singh over 8 years ago in reply to Ankit Gupta6

TI__Guru** 115271 points

Sorry for late reply -

For that you need to change the value of variables passed to InitPll function in DSP2833x_SysCtrl.c file. You need to see what clock you are using and pass the value accordingly to this function. Also if you change the frq to 100MHz, you need to change the flash settings accordingly.

Regards,
Vivek Singh

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CCS/TMS320F28335: How to check if sysclkout in f28335 150 or 100MHz?