【求助】关于定时时间
关于CPU定时的问题：了解到定时有一个cpuconfigtimer 函数，但是我看2812自带的一个工程，在cputimers.c中没有看到这个函数。那我想知道此时该如何看定时时间呢。附上cputimers.c程序。
//###########################################################################
//
// 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
#define Timer0PRD 0xf930
//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= Timer0PRD;
// Initialize pre-scale counter to divide by 1 (SYSCLKOUT):
CpuTimer0Regs.TPR.all= 0;
CpuTimer0Regs.TIM.all= 0;
CpuTimer0Regs.TPRH.all = 0;
// Make sure timer is stopped:
CpuTimer0Regs.TCR.bit.TSS = 1;//确定定时器停止
CpuTimer0Regs.TCR.bit.SOFT = 1;//当soft=1且free=1时，定时器自由运行
CpuTimer0Regs.TCR.bit.FREE = 1;
// Reload all counter register with period value:
CpuTimer0Regs.TCR.bit.TRB = 1;
CpuTimer0Regs.TCR.bit.TIE = 1;//1=使能定时器中断
// 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;
}
//===========================================================================
// No more.
//===========================================================================
最关键的一个带参数确定时间的函数没看到啊 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.POL = 0; // 0 = Pulse Low
Timer->RegsAddr->TCR.bit.TOG = 0; // 0 = No Toggle, POL bit defines action
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.FRCEN = 0; // Force output enable (not used)
Timer->RegsAddr->TCR.bit.PWIDTH = 7; // 7+1 = 8 SYSCLKOUT cycle pulse width
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;
} zhangmangui 发表于 2013-7-22 19:31 static/image/common/back.gif
void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
{
Uint32 temp;
是的，就是不知道为什么缺少了这个配置函数。但是他也正常定时了。我对比了一下这个程序和其他CPUtimer.c函数的区别。他有先对周期寄存器赋值 define Timer0PRD 0xf930 sunsundsp 发表于 2013-7-23 08:45 static/image/common/back.gif
是的，就是不知道为什么缺少了这个配置函数。但是他也正常定时了。我对比了一下这个程序和其他CPUtimer.c ...
哦那也可以只要赋值了是正常的 你在根据周期计算一下时间 zhangmangui 发表于 2013-7-23 09:12 static/image/common/back.gif
哦那也可以只要赋值了是正常的 你在根据周期计算一下时间
不会，可以告诉一下怎么算吗
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