dsp281x_cputimers.c

代码用于测试dsp2812的硬件功能

//###########################################################################
//
// FILE:	DSP281x_CpuTimers.c
//
// TITLE:	DSP281x CPU 32-bit Timers Initialization & Support Functions.
//

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

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File

struct CPUTIMER_VARS CpuTimer0;

// CpuTimer 1 and CpuTimer2 are reserved for DSP BIOS & other RTOS
//struct CPUTIMER_VARS CpuTimer1;
//struct CPUTIMER_VARS CpuTimer2;

interrupt void TINT0ISR(void);

//---------------------------------------------------------------------------
// 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;	             	
	
	
// CpuTimer 1 and CpuTimer2 are reserved for DSP BIOS & other RTOS
// Do not use these two timers if you ever plan on integrating 
// DSP-BIOS or another realtime OS. 
//
// For this reason, the code to manipulate these two timers is
// commented out and not used in these examples.

    // 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;

	EALLOW;
	PieVectTable.TINT0 = &TINT0ISR;
	EDIS;

}	
	
//---------------------------------------------------------------------------
// ConfigCpuTimer: 
//---------------------------------------------------------------------------
// unit:
// Freq: MHz
// period: μs
// The timer is held in the stopped state after configuration.
//---------------------------------------------------------------------------
//void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, Uint16 Freq, Uint32 Period)
{
	Uint32 	temp;
	
	// Initialize timer period:	
	Timer->CPUFreqInMHz = Freq;
	Timer->PeriodInUSec = Period;
//	temp = (long) (Freq * Period);
	temp = ((Uint32)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.SOFT = 0;
	Timer->RegsAddr->TCR.bit.FREE = 0;     //	
	Timer->RegsAddr->TCR.bit.TIE = 1;      // 0 = Disable/ 1 = Enable Timer Interrupt
	
	// Reset interrupt counter:
	Timer->InterruptCount = 0;
}

//-------------------------------------------
// Function: CPU time 0 interrupt service routine;
//-------------------------------------------
interrupt void TINT0ISR(void)
{
	CpuTimer0.InterruptCount++;
	// Serve the watchdog every Timer 0 interrupt
//	EALLOW;
//	SysCtrlRegs.WDKEY = 0x55;       // Serve watchdog #1
//	EDIS; 
	// To receive more interrupts from this PIE group, acknowledge this interrupt 
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; 
  
	// Next two lines for debug only to halt the processor here
	// Remove after inserting ISR Code
	// ESTOP0;
	// for(;;);
}

//===========================================================================
// No more.
//===========================================================================