CC2340R5: How to configure Timer

Hello Ankit Jaiswal,

Looking at your code snippet you included it seems like you did not include the "LGPTimerLPF3_start", which would not start the timer, which would explain why the timer is not working. Since the device never enters a low power mode the power consumption is relatively high (I measured ~1.5 days on the code below since CPU is always active + the GPIO, and 6 days if I remove the GPIO cover to disconnect it). 

Included is an example I adapted from TI Driver Library:

int count = 0;
int val = 0;
LGPTimerLPF3_Handle hTimer;
void timerCallback(LGPTimerLPF3_Handle lgptHandle, LGPTimerLPF3_IntMask interruptMask) {
    count++;
    val = count;
}
/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    /* 1 second delay */
    uint32_t time = 1;

    /* Call driver init functions */
    GPIO_init();

    /* Configure the LED pin */
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
    GPIO_setConfig(CONFIG_GPIO_LED_1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    uint32_t counterTarget;
     hTimer = NULL;
     LGPTimerLPF3_Params params;
     LGPTimerLPF3_Params_init(&params);
     params.hwiCallbackFxn = timerCallback;
     hTimer = LGPTimerLPF3_open(CONFIG_LGPTIMER_0, &params);
     if(hTimer == NULL) {
       //Log_error0("Failed to open LGPTimer");
       //Task_exit();
     }
     counterTarget = 48000;  // 1 ms with a system clock of 48 MHz
     LGPTimerLPF3_setInitialCounterTarget(hTimer, counterTarget, true);
     LGPTimerLPF3_enableInterrupt(hTimer, LGPTimerLPF3_INT_TGT);
     LGPTimerLPF3_start(hTimer, LGPTimerLPF3_CTL_MODE_UP_PER);
     sleep(time);
    while (1)
    {
        sleep(time);
        GPIO_toggle(CONFIG_GPIO_LED_0);
    }
}

Thanks,
Alex F

Please let me know How to put Device into Low Power Mode. Because Our application depends upon battery life.  

Hello Ankit Jaiswal,

To help reduce power consumption, I used LGPTimerLPF3_stop then LGPTimerLPF3_close to stop/close the timer; the details on how to stop the timer correctly are included in the LGPTimerLPFE.h file. Once the timer is closed the power consumption drops drastically, and instead of 6 days of battery life, I measured 4 years (using CCS EnergyTrace tool with the GPIO covers off). The following code snippet (modified version of empty.c project) is what I used to achieve this: 

void *mainThread(void *arg0)
{
    /* 1 second delay */
    uint32_t time = 1;

    /* Call driver init functions */
    GPIO_init();

    /* Configure the LED pin */
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
    GPIO_setConfig(CONFIG_GPIO_LED_1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    uint32_t counterTarget;
     hTimer = NULL;
     LGPTimerLPF3_Params params;
     LGPTimerLPF3_Params_init(&params);
     params.hwiCallbackFxn = timerCallback;
     hTimer = LGPTimerLPF3_open(CONFIG_LGPTIMER_0, &params);
     if(hTimer == NULL) {
       //Log_error0("Failed to open LGPTimer");
       //Task_exit();
     }
     counterTarget = 48000;  // 1 ms with a system clock of 48 MHz
     LGPTimerLPF3_setInitialCounterTarget(hTimer, counterTarget, true);
     LGPTimerLPF3_enableInterrupt(hTimer, LGPTimerLPF3_INT_TGT);
     LGPTimerLPF3_start(hTimer, LGPTimerLPF3_CTL_MODE_UP_PER); //LGPTimerLPF3_CTL_MODE_UP_ONCE
     sleep(time);
     LGPTimerLPF3_stop(hTimer);
     LGPTimerLPF3_close(hTimer);

    while (1)
    {
        sleep(time);
        GPIO_toggle(CONFIG_GPIO_LED_0);
    }
}

Thanks,
Alex F