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TM4C129 32/64位定时器分频

wenhua song
Prodigy 220 points


void Initial_Timer3(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER1);
TimerConfigure(WTIMER1_BASE,TIMER_CFG_A_PERIODIC_UP);
TimerPrescaleSet(WTIMER1_BASE,TIMER_A,50);
TimerLoadSet(WTIMER1_BASE,TIMER_A,0xffffffff);
TimerEnable(WTIMER1_BASE, TIMER_A);
}

系统时钟频率为50Mhz，想对32/64定时器实现分频，全周期计时，定时器每加一时长为1us，但程序执行时总会在执行到TimerConfigure(WTIMER1_BASE,TIMER_CFG_A_PERIODIC_UP);时跳到HardFault_Handler硬件错误中断里面去，这是为什么？

  • 0
    Guru 65885 points

    不应该呀，你追踪看看是哪个寄存器导致的进入了硬件中断的，另外还想问问楼主，你用的是哪个版本的库呀，用最新的库试试

        ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);

    //
    // Enable processor interrupts.
    //
    ROM_IntMasterEnable();

    //
    // Configure the two 32-bit periodic timers.
    //
    ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
    ROM_TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);

    这是官方给的一段代码

  • 0
    TI__Genius 13962 points

    楼主试一下在SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER1);这句话后面加一个短延迟：

    SysCtlDelay(5);