//###########################################################################
// FILE:    F2837xS_CpuTimers.c
// TITLE:   CPU 32-bit Timers Initialization & Support Functions.
// NOTES:
//###########################################################################
// $TI Release: F2837xS Support Library v191 $
// $Release Date: Fri Mar 11 15:58:35 CST 2016 $
// $Copyright: Copyright (C) 2014-2016 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################

#include "F2837xS_device.h"     // Headerfile Include File
#include "F2837xS_Examples.h"   // Examples Include File

struct CPUTIMER_VARS CpuTimer0;
struct CPUTIMER_VARS CpuTimer1;
struct CPUTIMER_VARS CpuTimer2;

//---------------------------------------------------------------------------
// InitCpuTimers:
//---------------------------------------------------------------------------
// This function initializes all three CPU timers to a known state.
void InitCpuTimers(void)
{
    // CPU Timer 0
    // Initialize address pointers to respective timer registers:
    CpuTimer0.RegsAddr = &CpuTimer0Regs;

    // Initialize timer period to maximum:
    CpuTimer0Regs.PRD.all  = 0xFFFFFFFF;

    // Initialize pre-scale counter to divide by 1 (SYSCLKOUT):
    CpuTimer0Regs.TPR.all  = 0;
    CpuTimer0Regs.TPRH.all = 0;

    // Make sure timer is stopped:
    CpuTimer0Regs.TCR.bit.TSS = 1;

    // Reload all counter register with period value:
    CpuTimer0Regs.TCR.bit.TRB = 1;

    // Reset interrupt counters:
    CpuTimer0.InterruptCount = 0;

// Initialize address pointers to respective timer registers:
    CpuTimer1.RegsAddr = &CpuTimer1Regs;
    CpuTimer2.RegsAddr = &CpuTimer2Regs;

    // Initialize timer period to maximum:
    CpuTimer1Regs.PRD.all  = 0xFFFFFFFF;
    CpuTimer2Regs.PRD.all  = 0xFFFFFFFF;

    // Initialize pre-scale counter to divide by 1 (SYSCLKOUT):
    CpuTimer1Regs.TPR.all  = 0;
    CpuTimer1Regs.TPRH.all = 0;
    CpuTimer2Regs.TPR.all  = 0;
    CpuTimer2Regs.TPRH.all = 0;

    // Make sure timers are stopped:
    CpuTimer1Regs.TCR.bit.TSS = 1;
    CpuTimer2Regs.TCR.bit.TSS = 1;

    // Reload all counter register with period value:
    CpuTimer1Regs.TCR.bit.TRB = 1;
    CpuTimer2Regs.TCR.bit.TRB = 1;

    // Reset interrupt counters:
    CpuTimer1.InterruptCount = 0;
    CpuTimer2.InterruptCount = 0;

}

//---------------------------------------------------------------------------
// ConfigCpuTimer:
//---------------------------------------------------------------------------
// This function initializes the selected timer to the period specified
// by the "Freq" and "Period" parameters. The "Freq" is entered as "MHz"
// and the period in "uSeconds". The timer is held in the stopped state
// after configuration.
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 - 1; // Counter decrements PRD+1 times each period

    // 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 = 0;
    Timer->RegsAddr->TCR.bit.FREE = 0;     // Timer Free Run Disabled
    Timer->RegsAddr->TCR.bit.TIE = 1;      // 0 = Disable/ 1 = Enable Timer
                                           // Interrupt

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



