[参考译文] CC2642R：输出时钟的计时器

您好、Jon、

下面是我之前使用的一些代码、用于配置计时器以在 CC2642/CC2652/CC1352/CC1312和类似器件上输出时钟。

#define CLOCK_PIN_ID (IOID_23)
#define CLOCK_FREQ   (12000000U)

////////////// OPEN

    GPTimerCC26XX_Params params;
    GPTimerCC26XX_Params_init(&params);
    params.width          = GPT_CONFIG_32BIT;
    params.mode           = GPT_MODE_PERIODIC_UP;
    params.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;
    timerHandle = GPTimerCC26XX_open(GPT_IDX, &params);

    /* Ensure that GPTImer was opened successfully */
    if(timerHandle == NULL)
    {
        return false;
    }

    /* Configure GPTimer to set clear pin initially and toggle on timeout */
    HWREG(timerHandle->hwAttrs->baseAddr + GPT_O_TAMR) |= GPT_TBMR_TCACT_CLRTOG_ON_TO;

    /* Set pin MUX based on GPTimer index */
    IOCPortConfigureSet(CLOCK_PIN_ID, GPTimerCC26XX_getPinMux(timerHandle),
                        IOC_IOMODE_NORMAL);
    

////////////// START

    /* Depend on XOSC_HF for precise clocks */
    Power_setDependency(PowerCC26XX_XOSC_HF);

    /* Set timer divider as fraction on CPU frequency */
    ClockP_FreqHz freqHz;
    ClockP_getCpuFreq(&freqHz);
    GPTimerCC26XX_Value loadVal = ((uint32_t)(freqHz.lo) / (2*CLOCK_FREQ)) - 1;
    GPTimerCC26XX_setLoadValue(timerHandle, loadVal);

    /* Start the Timer */
    GPTimerCC26XX_start(timerHandle);



////////////// STOP

        /* Stop the timer from running */
        GPTimerCC26XX_stop(timerHandle);

        /* XOSC_HF is no longer needed as clock is not running */
        Power_releaseDependency(PowerCC26XX_XOSC_HF);
        
        
////////////// CLOSE

        /* Close the timer instance */
        GPTimerCC26XX_close(timerHandle);
        timerHandle = NULL;

我希望这将有所帮助、

此致、