- //###########################################################################
- //
- // 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.
- //===========================================================================