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TMS320F280049C: How to implement the values of two counters adding in CLB?

jjl3
Intellectual 850 points

Part Number: TMS320F280049C

Dear Mr. / Ms.

I want the Event load value is NOT a constant, instead, for example, it is the current value of counter1 add 1000.

is it possible to implement?

thanks!

BR

jjl3

  • 0
    TI__Mastermind 22651 points

    Hi jjl3,

    No it would not be possible to make the event load value be anything other than a static value since the CLB cannot perform additional/subtraction. The HLC controller has this functionality, but can only manipulate the current counter value, the match 1 reference, and the match 2 reference. What is the application you are using for which this is required? I would think you should only be able to accomplish your logic in count-down mode then

    Regards,

    Peter

  • 0 in reply to Peter Luong
    Intellectual 850 points

    Hello, Peter

    the application is,

    I want to measure the width of a pulse using one counter, and want this value to be added to a constant as the Match reference of another counter.

    it is possible to implement via using HLC functionality?

    thanks!

    BR

    jjl3

  • +1 in reply to jjl3
    TI__Mastermind 22651 points

    Hi Mr. Ji,

    With the description you have proposed, it should be possible to use the HLC to perform this action. What you can do is have an HLC event triggered by the falling edge of the pulse you are measuring, then within that HLC event you can latch the value of the counter, then use the ADD instruction to add this counter value to a register value. The register should be populated with the constant value you are wanting to add (can be initialized to this value or written to from the CPU). Then you can use the MOV_T1 or MOV_T2 command to move the value of this register to the match reference of another counter

    Regards,

    Peter