[参考译文] EK-TM4C123GXL：计数器在RTC模式下不计数。

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https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1088462/ek-tm4c123gxl-counter-will-not-count-in-rtc-mode

部件号：EK-TM4C123GXL

我找不到RTC的示例，因此我发现我的设置有问题。我有一个32.768kHz晶体连接到PD2和3。值保持在1。

下面是设置。

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int
main(void)
{
    volatile uint64_t vg = 0;
    volatile uint64_t vg1 = 1000000LLU;
    MAP_FPULazyStackingEnable();
    MAP_SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER3);
    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
    MAP_GPIOPinConfigure(GPIO_PD3_WT3CCP1);
    MAP_GPIOPinTypeTimer(GPIO_PORTD_BASE, GPIO_PIN_3);
    MAP_GPIOPinConfigure(GPIO_PD2_WT3CCP0);
    MAP_GPIOPinTypeTimer(GPIO_PORTD_BASE, GPIO_PIN_2);
    MAP_TimerLoadSet64(WTIMER3_BASE, vg1);
    MAP_TimerConfigure(WTIMER3_BASE, TIMER_CFG_RTC);
    //MAP_TimerEnable(WTIMER3_BASE, TIMER_A);
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

int
main(void)
{
    volatile uint64_t vg = 0;
    volatile uint64_t vg1 = 1000000LLU;

    MAP_FPULazyStackingEnable();

    MAP_SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER3);
    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

    MAP_GPIOPinConfigure(GPIO_PD3_WT3CCP1);
    MAP_GPIOPinTypeTimer(GPIO_PORTD_BASE, GPIO_PIN_3);
    MAP_GPIOPinConfigure(GPIO_PD2_WT3CCP0);
    MAP_GPIOPinTypeTimer(GPIO_PORTD_BASE, GPIO_PIN_2);
    MAP_TimerLoadSet64(WTIMER3_BASE, vg1);

    MAP_TimerConfigure(WTIMER3_BASE, TIMER_CFG_RTC);
    //MAP_TimerEnable(WTIMER3_BASE, TIMER_A);
    TimerRTCEnable(WTIMER3_BASE);

    while(1)
    {
        vg = TimerValueGet64(WTIMER3_BASE);
        SysCtlDelay(100000);
    }
}

4 年多前