RTOS: How to create a timer as Input Capture mode in TI RTOS

Vinay Kumar Shettar

Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

I am using AM572x evm board and programming in Cortex M4 running TI RTOS. Configured pin B26 (xref_clk2) as timer15.

I need to use TImer 15 as input capture. where I need to measure the frequency in my program which should be same as frequency given externally.

Please let me how to create the timer for input capture and what to set for the timerParams.?

    timerParams.period = ?
    timerParams.startMode = ?
   timerParams.periodType = ?

Example would be helpful.

over 7 years ago

0 Vincent W. over 7 years ago

TI__Genius 12865 points

Hi Vinay,

The Timer module in SYSBIOS does not support input capture mode. You should ensure Timer 15 is not being used elsewhere in your program, and then just program the timer registers manually.

Best regards,
Vincent

0 Vinay Kumar Shettar over 7 years ago in reply to Vincent W.

Intellectual 410 points

Thank you Vincent. In such case how do I register my Callback ( ISR ) for timer15. For example I want my ISR callback to be called for every raising edge of the input frequency given to TImer.

0 Vincent W. over 7 years ago in reply to Vinay Kumar Shettar

TI__Genius 12865 points

Hi Vinay,

You would have to treat the interrupt just like any other by setting up the Hwi module to call your ISR upon the occurrence of the interrupt. Please refer to SYSBIOS user guide and API guide for more details on the Hwi module under the directory <BIOS installation dir>/docs.

Best regards,

Vincent

0 Kenia Guinto over 7 years ago in reply to Vincent W.

TI__Expert 7250 points

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RTOS: How to create a timer as Input Capture mode in TI RTOS