116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
// TI File $Revision: /main/3 $
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// Checkin $Date: March 16, 2007 08:37:30 $
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//###########################################################################
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//
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// FILE: DSP2833x_CpuTimers.c
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//
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// TITLE: CPU 32-bit Timers Initialization & Support Functions.
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//
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// NOTES: CpuTimer1 and CpuTimer2 are reserved for use with DSP BIOS and
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// other realtime operating systems.
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//
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// Do not use these two timers in your application if you ever plan
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// on integrating DSP-BIOS or another realtime OS.
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//
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//
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//###########################################################################
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// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
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// $Release Date: August 1, 2008 $
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//###########################################################################
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#include "DSP2833x_Device.h" // Headerfile Include File
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#include "DSP2833x_Examples.h" // Examples Include File
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struct CPUTIMER_VARS CpuTimer0;
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// CpuTimer 1 and CpuTimer2 are used by DSP BIOS & other RTOS. Comment out if using DSP BIOS or other RTOS.
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struct CPUTIMER_VARS CpuTimer1;
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struct CPUTIMER_VARS CpuTimer2;
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//---------------------------------------------------------------------------
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// InitCpuTimers:
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//---------------------------------------------------------------------------
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// This function initializes all three CPU timers to a known state.
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//
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void InitCpuTimers(void)
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{
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// CPU Timer 0
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// Initialize address pointers to respective timer registers:
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CpuTimer0.RegsAddr = &CpuTimer0Regs;
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// Initialize timer period to maximum:
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CpuTimer0Regs.PRD.all = 0xFFFFFFFF;
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// Initialize pre-scale counter to divide by 1 (SYSCLKOUT):
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CpuTimer0Regs.TPR.all = 0;
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CpuTimer0Regs.TPRH.all = 0;
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// Make sure timer is stopped:
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CpuTimer0Regs.TCR.bit.TSS = 1;
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// Reload all counter register with period value:
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CpuTimer0Regs.TCR.bit.TRB = 1;
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// Reset interrupt counters:
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CpuTimer0.InterruptCount = 0;
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// CpuTimer 1 and CpuTimer2 are reserved for DSP BIOS & other RTOS
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// Do not use these two timers if you ever plan on integrating
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// DSP-BIOS or another realtime OS.
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//
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// Initialize address pointers to respective timer registers:
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CpuTimer1.RegsAddr = &CpuTimer1Regs;
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CpuTimer2.RegsAddr = &CpuTimer2Regs;
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// Initialize timer period to maximum:
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CpuTimer1Regs.PRD.all = 0xFFFFFFFF;
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CpuTimer2Regs.PRD.all = 0xFFFFFFFF;
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// Initialize pre-scale counter to divide by 1 (SYSCLKOUT):
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CpuTimer1Regs.TPR.all = 0;
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CpuTimer1Regs.TPRH.all = 0;
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CpuTimer2Regs.TPR.all = 0;
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CpuTimer2Regs.TPRH.all = 0;
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// Make sure timers are stopped:
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CpuTimer1Regs.TCR.bit.TSS = 1;
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CpuTimer2Regs.TCR.bit.TSS = 1;
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// Reload all counter register with period value:
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CpuTimer1Regs.TCR.bit.TRB = 1;
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CpuTimer2Regs.TCR.bit.TRB = 1;
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// Reset interrupt counters:
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CpuTimer1.InterruptCount = 0;
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CpuTimer2.InterruptCount = 0;
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}
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//---------------------------------------------------------------------------
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// ConfigCpuTimer:
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//---------------------------------------------------------------------------
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// This function initializes the selected timer to the period specified
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// by the "Freq" and "Period" parameters. The "Freq" is entered as "MHz"
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// and the period in "uSeconds". The timer is held in the stopped state
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// after configuration.
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//
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void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
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{
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Uint32 temp;
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// Initialize timer period:
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Timer->CPUFreqInMHz = Freq;
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Timer->PeriodInUSec = Period;
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temp = (long) (Freq * Period);
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Timer->RegsAddr->PRD.all = temp;
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// Set pre-scale counter to divide by 1 (SYSCLKOUT):
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Timer->RegsAddr->TPR.all = 0;
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Timer->RegsAddr->TPRH.all = 0;
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// Initialize timer control register:
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Timer->RegsAddr->TCR.bit.TSS = 1; // 1 = Stop timer, 0 = Start/Restart Timer
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Timer->RegsAddr->TCR.bit.TRB = 1; // 1 = reload timer
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Timer->RegsAddr->TCR.bit.SOFT = 0;
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Timer->RegsAddr->TCR.bit.FREE = 0; // Timer Free Run Disabled
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Timer->RegsAddr->TCR.bit.TIE = 1; // 0 = Disable/ 1 = Enable Timer Interrupt
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// Reset interrupt counter:
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Timer->InterruptCount = 0;
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}
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//===========================================================================
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// End of file.
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//===========================================================================
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