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//###########################################################################
//
// FILE: F2837xD_CpuTimers.c
//
// TITLE: CPU 32-bit Timers Initialization & Support Functions.
//
//###########################################################################
// $TI Release: F2837xD Support Library v3.05.00.00 $
// $Release Date: Tue Jun 26 03:15:23 CDT 2018 $
// $Copyright:
// Copyright (C) 2013-2018 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 "F2837xD_device.h"
#include "F2837xD_Examples.h"
//
// Globals
//
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);
//
// Counter decrements PRD+1 times each period
//
Timer->RegsAddr->PRD.all = temp - 1;
//
// 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;
}
//
// End of file
//
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