CCS/TMS320F28335: Timer configuration C2000

Tool/software: Code Composer Studio

Hi, since 4 years we use the really helpful source files for configuration of C2000 hardware.

e.G. Timer configuration, here this soure code (see below), which is delivered with several tools like ControlSuite.

I wonder, if this line is correct to get the exact wished time:

temp = (long) (Freq * Period);

Could it be possible, that there is than a difference of one cycle?

And the correct code have to be this:

temp = (long) (Freq * Period) -1;

????

br Ralf

void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
{
    Uint32  temp;

    // Initialize timer period:
    Timer->CPUFreqInMHz = Freq;
    Timer->PeriodInUSec = Period;
    temp = (long) (Freq * Period);
    Timer->RegsAddr->PRD.all = temp;

    // Set pre-scale counter to divide by 1 (SYSCLKOUT):
    Timer->RegsAddr->TPR.all  = 0;
    Timer->RegsAddr->TPRH.all  = 0;

    // Initialize timer control register:
    Timer->RegsAddr->TCR.bit.TSS = 1;      // 1 = Stop timer, 0 = Start/Restart Timer
    Timer->RegsAddr->TCR.bit.TRB = 1;      // 1 = reload timer
    Timer->RegsAddr->TCR.bit.SOFT = 1;
    Timer->RegsAddr->TCR.bit.FREE = 1;     // Timer Free Run
    Timer->RegsAddr->TCR.bit.TIE = 1;      // 0 = Disable/ 1 = Enable Timer Interrupt

    // Reset interrupt counter:
    Timer->InterruptCount = 0;
}