DSP28335定时器初始化程序

DSP28335定时器初始化程序 // TI File $Revision: /main/3 $ // Checkin $Date: March 16, 2007 08:37:30 $ //########################################################################### // // FILE: DSP2833x_CpuTimers.c // // TITLE: 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. // // //########################################################################### // $TI Release: DSP2833x Header Files V1.01 $ // $Release Date: September 26, 2007 $ //########################################################################### #include "DSP2833x_Device.h" // Headerfile Include File #include "DSP2833x_Examples.h" // Examples Include File struct CPUTIMER_VARS CpuTimer0; // CpuTimer 1 and CpuTimer2 are used by DSP BIOS & other RTOS. Comment out if using DSP BIOS or 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. // // 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 = 0; Timer->RegsAddr->TCR.bit.FREE = 0; // 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. //===========================================================================