cc2640r2f的硬件定时器和软件定时器都不精确，怎么回事，怎么提高定时器精度？

我需要20khz的定时，也就是50us，分别用了硬件定时器和软件定时器分别作了测试，都不是特别精确

软件定时器：

void AddPwmOutTimer(void)
{
    Clock_Params clockParams;

    // Convert clockDuration in milliseconds to ticks.
    uint32_t clockTicks = 50/Clock_tickPeriod;//50us

    // Setup parameters.
    Clock_Params_init(&clockParams);

    // Setup argument.
//    clockParams.arg = arg;

    // If period is 0, this is a one-shot timer.
    clockParams.period = 50/Clock_tickPeriod;//50us

    // Starts immediately after construction if true, otherwise wait for a call
    // to start.
    clockParams.startFlag = false;

    // Initialize clock instance.
    Clock_construct(&PwmOutClock, PwmOutTimerHandler, clockTicks, &clockParams);
}

硬件定时器：

Hwi_Struct timer2Hwi;
void Timer2Init(void)
{
  /* Switches the peripheral power domain on */
  Power_setDependency(PowerCC26XX_PERIPH_GPT2);
  /* Prevents the controller from going to standby */
  Power_setConstraint(PowerCC26XX_SB_DISALLOW);
  // register ISR and enable hardware interrupt for timer
  Hwi_Params params;
  Hwi_Params_init(&params);
  params.enableInt = TRUE;
  Hwi_construct(&timer2Hwi, INT_GPT2A, &interruptTimerA, &params, NULL);
  /* Configure the timer hardware */
  TimerDisable(GPT2_BASE, TIMER_A);
  TimerConfigure(GPT2_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PERIODIC | TIMER_CFG_B_PERIODIC);
  TimerPrescaleSet(GPT2_BASE, TIMER_A, 0); // prescaler is 1 – 48Mhz
  TimerLoadSet(GPT2_BASE, TIMER_A, 2400); // 20 khz
//  TimerIntClear(GPT2_BASE, TIMER_TIMA_TIMEOUT);
//  TimerIntEnable(GPT2_BASE, TIMER_TIMA_TIMEOUT);
//  TimerEnable(GPT2_BASE, TIMER_A);
  TimerIntDisable(GPT2_BASE, TIMER_TIMA_TIMEOUT);
  TimerDisable(GPT2_BASE, TIMER_A);
  TimerIntClear(GPT2_BASE, TIMER_TIMA_TIMEOUT);
}

因为我要动态修改PWM占空比，我的PWM周期就是20k，没有PWM中断，只能用定时器的方法，但是发现定时器不精准，导致经常性的无法及时修改pwm占空比，很头疼，这个问题怎么解决呢？

Viki Shi：

用协议栈的话，确实us级别的精度难以达到。可以看下这边的类似贴：e2echina.ti.com/…/122853