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TMS320F28027F: Instruction cycle delay

Mohamed Aslam1
Prodigy 150 points
Part Number: TMS320F28027F

Hi all,

   When I dumping my program in RAM memory through RAM link file, it takes 140ns to complete the instruction. But when I upload my program in flash memory through generic flash file, it takes 1.5 micro seconds to complete the instruction. 

Please give some idea to reduce the instruction cycle delay while I upload my program in flash memory.

And I am using 60 MHZ clock, it is possible to work in 120 MHZ clock.

Please respond.

Thanks,

Aslam

  • 0
    Prodigy 150 points

    Here is the snippet of my code:

    if ((GpioDataRegs.GPADAT.bit.GPIO12 == 0) && (GpioDataRegs.GPADAT.bit.GPIO29 == 0))
    {
    GpioDataRegs.GPACLEAR.bit.GPIO6 = 1;
    GpioDataRegs.GPASET.bit.GPIO7 = 1;
    }
    else if ((GpioDataRegs.GPADAT.bit.GPIO12 == 1) && (GpioDataRegs.GPADAT.bit.GPIO29 == 0))
    {
    GpioDataRegs.GPASET.bit.GPIO6 = 1;
    GpioDataRegs.GPASET.bit.GPIO7 = 1;
    }

    else if ((GpioDataRegs.GPADAT.bit.GPIO12 == 1) && (GpioDataRegs.GPADAT.bit.GPIO29 == 1))
    {
    GpioDataRegs.GPASET.bit.GPIO6 = 1;
    GpioDataRegs.GPACLEAR.bit.GPIO7 = 1;
    }
    else if ((GpioDataRegs.GPADAT.bit.GPIO12 == 0) && (GpioDataRegs.GPADAT.bit.GPIO29 == 1))
    {
    GpioDataRegs.GPASET.bit.GPIO6 = 1;
    GpioDataRegs.GPASET.bit.GPIO7 = 1;
    }

    what I am actually trying is  reading  two pwm outputs through GPIO12 and GPIO29 and based on their states, I am changing state of  GPIO6 and GPIO7.

    But output getting from GPIO6 and GPIO7 are delayed by 4 micro seconds. So for the higher pwm frequency (100khz), I am only getting high state from GPIO6 and GPIO7.

    But the same program is working, when I upload the program in RAM memory (giving output with a delay of 500-900ns which is negligible).

    When I upload the program in flash memory, It fails.

    please give me a solution.

    Thanks,

    Aslam

  • 0 in reply to Mohamed Aslam1
    TI__Mastermind 45166 points

    Hi Aslam,

    Please see the FAQ linked below. You may need to check the flash wait states set or configure time critical code to run from RAM.

    https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/759912

    Mohamed Aslam1 said:
    And I am using 60 MHZ clock, it is possible to work in 120 MHZ clock.

    The F28027 device has a 60 MHz max clock frequency.

    Best,

    Kevin