CC2640: Beacon advertisement issue

Hi Fredrik,

Did you read my last message?

Regards,
Sumair

Is there any chance that some batch of TI chip has this problem?

Regards,
Sumair

Fredrik K said:

HI Sumair,

There are no known problems associated with what you see.

You still have not answered this question: Why do you believe there is a problem with the capacitor? What measurements is this conclusion based on?

Regards,
Fredrik

Hello Fredrik,

After analyzing the situation I came to a conclusion that this problem is some how related to "brownout" condition.

Sometime it happens that if power is removed and plugged in immediately, then tag doesn't restarts and it enters into an unknown state in which it doesn't send advertisement data, unless power is removed for particular time and allow all the capacitors to discharge. 
Please see attached video for better understanding.

Please be noted that even in this unknown state "External Hardware Interrupt" does work.

Hello Christin Lee 

I'd appreciate if you can look into this problem.


Thanks

Sumair Qureshi

Hello Christin Lee,

Thanks for your prompt response. I have already tried it, but i didn't work :(

Regards,
Sumair

Please use task_sleep instead of delay_ms.  so that the device can stay in low power state when it tries to boot.

Following is the example code. 

/*******************************************************************************
 * @fn          Main
 *
 * @brief       Application Main
 *
 * input parameters
 *
 * @param       None.
 *
 * output parameters
 *
 * @param       None.
 *
 * @return      None.   
 */

void delayTaskFxn(uintptr_t a0, uintptr_t a1)
{

  Task_sleep(5000 * (1000 / Clock_tickPeriod));

  
  Task_disable();
  
  /* Initialize ICall module */
  ICall_init();
  
  /* Start tasks of external images - Priority 5 */
  ICall_createRemoteTasks();
  
  /* Kick off profile - Priority 3 */
  GAPRole_createTask();
  
  SimpleBLEPeripheral_createTask();
  
  Task_enable();
  
}

Task_Struct delayTaskStruct;
uint8_t delayTaskStack[1024];


int main()
{
  /* Register Application callback to trap asserts raised in the Stack */
  RegisterAssertCback(AssertHandler);

  PIN_init(BoardGpioInitTable);

#ifdef CC1350_LAUNCHXL
  // Enable 2.4GHz Radio
  radCtrlHandle = PIN_open(&radCtrlState, radCtrlCfg);
  
#ifdef POWER_SAVING
  Power_registerNotify(&rFSwitchPowerNotifyObj, 
                       PowerCC26XX_ENTERING_STANDBY | PowerCC26XX_AWAKE_STANDBY,
                       (Power_NotifyFxn) rFSwitchNotifyCb, NULL);
#endif //POWER_SAVING
#endif //CC1350_LAUNCHXL

#ifndef POWER_SAVING
  /* Set constraints for Standby, powerdown and idle mode */
  Power_setConstraint(PowerCC26XX_SB_DISALLOW);
  Power_setConstraint(PowerCC26XX_IDLE_PD_DISALLOW);
#endif // POWER_SAVING

  Task_Params taskParams;
  Task_Params_init(&taskParams);
  taskParams.stack = delayTaskStack;
  taskParams.stackSize = sizeof(delayTaskStack);

  Task_construct(&delayTaskStruct, delayTaskFxn, &taskParams, NULL);

  /* enable interrupts and start SYS/BIOS */
  BIOS_start();

  return 0;
}

Yes I can consistently provoke the issue on all device.

There are 3 states;

State 1: Normal Working

State 2: Hanging Unknown State (In which advertisement stops automatically)

Solution of this problem:

UnPlug the battery for 5-10 secs to all all capacitor to discharge.

State 3: Advertisement Unknown State (In which advertisement stops Manually)

Solution of this problem:

1- UnPlug the battery for 5-10 secs to all all capacitor to discharge.

2- Use External Interrupt to enable advertisement  through "initialAdvertEnable" flag.

Following are values of voltage in all 3 states;

- VDDR Voltage at State 1: 1.675V

- VDDR Voltage at State 2 : 0.00V

- VDDR Voltage at State 3: Fluctuating from 1.5V to 1.6V

- DCOUPL Voltage at State 1: 3.66V

- DCOUPL Voltage at State 2: 3.66V

- DCOUPL Voltage at State 3: 3.66V

Regards,

Sumair Qureshi

Hi Sumair,

I meant the DCOUPL pin, not the VDDS decoupling capacitors. Anyway, it is not important, if VDDR is 0 V then DCOUPL will also be 0 V. 

Can you use an oscilloscope an capture the VDDS curve and the VDDR curve when you trigger the problem?

Regards,
Fredrik

Hello Fredrik,

As mentioned earlier there are 3 states.

State 1 (normal working state) and state 2 3 (Advertisement manually turn off) is repeatable and Waveform at DCOUPL pin in state 1 and state 2 3 are normal (i.e. 1.2V), while state 3 2 (Unknown state, which is the main problem) is not repeatable, so i am unable to capture the waveform now. 


Regards,
Sumair