关于DSP28335的CPU 定时器的配置问题

Posted 2023-03-14

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; 能给我解释一下这段程序吗？

参考技术A CPUFreqInMHz是DSP的实际工作频率，这个参数的单位是MHz，
PeriodInUSec是要定时的时间长度，单位是微秒
定时值＝定时长度/(CPU的周期）＝定时长度×CPU的频率
Timer->RegsAddr->PRD.all=
temp
向定时器周期寄存器赋值
Timer->RegsAddr->TPR.all
=
0;
Timer->RegsAddr->TPRH.all
=
0；
上面两句是配置定时器预定标寄存器，每个定时器源时钟周期TIM（定时器计数器）减一
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
上面这五句是配置定时器控制寄存器，TSS写1，停止定时器；TRB写1，使能定时器重新装载；SOFT=0、FREE=0是配置CPU定时器仿真模式；TIE写1，CPU定时器中断使能。
以上是我的理解，我也是刚学，如有错误，还望高三指点