www.pudn.com > ACM_dsp2812.rar > DSP281x_CpuTimers.h

//########################################################################### 
// 
// FILE:    DSP281x_CpuTimers.h 
// 
// TITLE:   DSP281x CPU 32-bit Timers Register Definitions. 
// 
// 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) 
//      |             |      | Corrected the definition of the TCR register 
//########################################################################### 
 
#ifndef DSP281x_CPU_TIMERS_H 
#define DSP281x_CPU_TIMERS_H 
 
#ifdef __cplusplus 
extern "C" { 
#endif 
 
//--------------------------------------------------------------------------- 
// CPU Timer Register Bit Definitions: 
// 
// 
// TCR: Control register bit definitions: 
struct  TCR_BITS {          // bits  description 
   Uint16    rsvd1:4;       // 3:0   reserved 
   Uint16    TSS:1;         // 4     Timer Start/Stop 
   Uint16    TRB:1;         // 5     Timer reload 
   Uint16    rsvd2:4;       // 9:6   reserved 
   Uint16    SOFT:1;        // 10    Emulation modes 
   Uint16    FREE:1;        // 11 
   Uint16    rsvd3:2;       // 12:13 reserved 
   Uint16    TIE:1;         // 14    Output enable 
   Uint16    TIF:1;         // 15    Interrupt flag 
};  
 
union TCR_REG { 
   Uint16           all; 
   struct TCR_BITS  bit; 
}; 
 
// TPR: Pre-scale low bit definitions: 
struct  TPR_BITS {        // bits  description 
   Uint16     TDDR:8;     // 7:0   Divide-down low 
   Uint16     PSC:8;      // 15:8  Prescale counter low 
}; 
 
union TPR_REG { 
   Uint16           all; 
   struct TPR_BITS  bit; 
}; 
 
// TPRH: Pre-scale high bit definitions: 
struct  TPRH_BITS {       // bits  description 
   Uint16     TDDRH:8;      // 7:0   Divide-down high 
   Uint16     PSCH:8;       // 15:8  Prescale counter high 
}; 
 
union TPRH_REG { 
   Uint16           all; 
   struct TPRH_BITS bit; 
}; 
 
// TIM, TIMH: Timer register definitions: 
struct TIM_REG { 
   Uint16  LSW; 
   Uint16  MSW; 
}; 
 
union TIM_GROUP { 
   Uint32          all; 
   struct TIM_REG  half; 
}; 
 
// PRD, PRDH: Period register definitions: 
struct PRD_REG { 
   Uint16  LSW; 
   Uint16  MSW; 
}; 
 
union PRD_GROUP { 
   Uint32          all; 
   struct PRD_REG  half; 
}; 
 
//--------------------------------------------------------------------------- 
// CPU Timer Register File: 
// 
struct CPUTIMER_REGS { 
   union TIM_GROUP TIM;   // Timer counter register 
   union PRD_GROUP PRD;   // Period register 
   union TCR_REG   TCR;   // Timer control register 
   Uint16          rsvd1; // reserved 
   union TPR_REG   TPR;   // Timer pre-scale low 
   union TPRH_REG  TPRH;  // Timer pre-scale high 
}; 
 
//--------------------------------------------------------------------------- 
// CPU Timer Support Variables: 
// 
struct CPUTIMER_VARS { 
   volatile struct  CPUTIMER_REGS  *RegsAddr; 
   Uint32    InterruptCount; 
   float   CPUFreqInMHz; 
   float   PeriodInUSec; 
}; 
 
//--------------------------------------------------------------------------- 
// Function prototypes and external definitions: 
// 
void InitCpuTimers(void); 
void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period); 
 
extern volatile struct CPUTIMER_REGS CpuTimer0Regs; 
extern struct CPUTIMER_VARS CpuTimer0; 
 
// CpuTimer 1 and CpuTimer2 are reserved for DSP BIOS & other RTOS 
//extern volatile struct CPUTIMER_REGS CpuTimer1Regs; 
//extern volatile struct CPUTIMER_REGS CpuTimer2Regs; 
 
//extern struct CPUTIMER_VARS CpuTimer1; 
//extern struct CPUTIMER_VARS CpuTimer2; 
 
//--------------------------------------------------------------------------- 
// Usefull Timer Operations: 
// 
// Start Timer: 
#define StartCpuTimer0()  CpuTimer0Regs.TCR.bit.TSS = 0 
 
// Stop Timer: 
#define StopCpuTimer0()   CpuTimer0Regs.TCR.bit.TSS = 1 
 
// Reload Timer With period Value: 
#define ReloadCpuTimer0() CpuTimer0Regs.TCR.bit.TRB = 1 
 
// Read 32-Bit Timer Value: 
#define ReadCpuTimer0Counter() CpuTimer0Regs.TIM.all 
 
// Read 32-Bit Period Value: 
#define ReadCpuTimer0Period() CpuTimer0Regs.PRD.all 
 
// 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. 
 
// Start Timer: 
//#define StartCpuTimer1()  CpuTimer1Regs.TCR.bit.TSS = 0 
//#define StartCpuTimer2()  CpuTimer2Regs.TCR.bit.TSS = 0 
 
// Stop Timer: 
//#define StopCpuTimer1()   CpuTimer1Regs.TCR.bit.TSS = 1 
//#define StopCpuTimer2()   CpuTimer2Regs.TCR.bit.TSS = 1 
 
// Reload Timer With period Value: 
//#define ReloadCpuTimer1() CpuTimer1Regs.TCR.bit.TRB = 1 
//#define ReloadCpuTimer2() CpuTimer2Regs.TCR.bit.TRB = 1 
 
// Read 32-Bit Timer Value: 
//#define ReadCpuTimer1Counter() CpuTimer1Regs.TIM.all 
//#define ReadCpuTimer2Counter() CpuTimer2Regs.TIM.all 
 
// Read 32-Bit Period Value: 
//#define ReadCpuTimer1Period() CpuTimer1Regs.PRD.all 
//#define ReadCpuTimer2Period() CpuTimer2Regs.PRD.all 
 
 
#ifdef __cplusplus 
} 
#endif /* extern "C" */ 
 
#endif  // end of DSP281x_CPU_TIMERS_H definition 
 
 
//=========================================================================== 
// No more. 
//===========================================================================