www.pudn.com > PMSM.zip > DSP281x_CpuTimers.c, change:2003-09-11,size:4665b


//########################################################################### 
// 
// FILE:	DSP281x_CpuTimers.c 
// 
// TITLE:	DSP281x CPU 32-bit Timers Initialization & Support Functions. 
// 
// NOTES:   CpuTimer1 and CpuTimer2 are reserved for use with DSP BIOS and 
//          other realtime operating systems.   
// 
//          Do not use these two timers in your application 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. 
//            
//########################################################################### 
// 
//  Ver | dd mmm yyyy | Who  | Description of changes 
// =====|=============|======|=============================================== 
//  1.00| 11 Sep 2003 | L.H  | Changes since previous version (v.58 Alpha) 
//      |             |      | Removed some incorrect parameters in the timer 
//      |             |      | setup that are not available on this device 
//########################################################################### 
 
#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; 
 
//--------------------------------------------------------------------------- 
// 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; 
 
}	 
	 
//--------------------------------------------------------------------------- 
// 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 
	Timer->RegsAddr->TCR.bit.TIE = 1;      // 0 = Disable/ 1 = Enable Timer Interrupt 
	 
	// Reset interrupt counter: 
	Timer->InterruptCount = 0; 
} 
 
//=========================================================================== 
// No more. 
//===========================================================================