// TI File $Revision: /main/4 $

// Checkin $Date: July 9, 2009 10:51:59 $

//###########################################################################

//

// FILE: DSP2833x_CpuTimers.c

//

// TITLE: CPU 32-bit Timers Initialization & Support Functions.

//

// NOTES: CpuTimer2 is reserved for use with DSP BIOS and

// other realtime operating systems.

//

// Do not use these this timer in your application if you ever plan

// on integrating DSP-BIOS or another realtime OS.

//

//###########################################################################

// $TI Release: F2833x Support Library v2.00.00.00 $

// $Release Date: Sun Mar 25 13:25:02 CDT 2018 $

// $Copyright:

// Copyright (C) 2009-2018 Texas Instruments Incorporated - http://www.ti.com/

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions

// are met:

//

// Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

//

// Redistributions in binary form must reproduce the above copyright

// notice, this list of conditions and the following disclaimer in the

// documentation and/or other materials provided with the

// distribution.

//

// Neither the name of Texas Instruments Incorporated nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// $

//###########################################################################

//

// Included Files

//

#include "DSP2833x_Device.h" // Headerfile Include File

#include "DSP2833x_Examples.h" // Examples Include File

//

// Defines

//

struct CPUTIMER_VARS CpuTimer0;

//

// When using DSP BIOS & other RTOS, comment out CPU Timer 2 code.

//

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;

//

// CpuTimer2 is reserved for DSP BIOS & other RTOS

// Do not use this timer if you ever plan on integrating

// DSP-BIOS or another realtime OS.

//

//

// 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;

//

// 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;

//

// Set pre-scale counter to divide by 1 (SYSCLKOUT)

//

Timer->RegsAddr->TPR.all = 0;

Timer->RegsAddr->TPRH.all = 0;

//

// Initialize timer control register

//

//

// 1 = Stop timer, 0 = Start/Restart Timer

//

Timer->RegsAddr->TCR.bit.TSS = 1;

Timer->RegsAddr->TCR.bit.TRB = 1; // 1 = reload timer

Timer->RegsAddr->TCR.bit.SOFT = 1;

Timer->RegsAddr->TCR.bit.FREE = 1; // Timer Free Run

//

// 0 = Disable/ 1 = Enable Timer Interrupt

//

Timer->RegsAddr->TCR.bit.TIE = 1;

//

// Reset interrupt counter

//

Timer->InterruptCount = 0;

}

//

// End of File

//