GearedMotors700W/DSP2803x_CpuTimers.c

// TI File $Revision: /main/1 $
// Checkin $Date: December 5, 2008   18:00:45 $
//###########################################################################
//
// FILE:	DSP2803x_CpuTimers.c
//
// TITLE:	CPU 32-bit Timers Initialization & Support Functions.
//
// NOTES:
//
//###########################################################################
// $TI Release: 2803x Header Files V1.01 $
// $Release Date: April 30, 2009 $
//###########################################################################

#include "DSP2803x_Device.h"     // Headerfile Include File
#include "DSP2803x_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;

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

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

//===========================================================================
// End of file.
//===========================================================================