CCS/CC2640: Task hanging on BLE Notification

Sam Pattemore

Part Number: CC2640

Tool/software: Code Composer Studio

Hi, I have developed a program for this board. it started out at ProjectZero. I used BDS to develop a custom profile with 3 services and a total of about 6 characteristics.

The application utilises a state machine of sorts. BLE reading and writing seems to be working fine, I have an iPhone app that I am using to control the CC2640.

I can control the state of the machine by writing to some characteristics from the iPhone.

I have set the CC2640 to update characteristic values at an interval of say 5S and this works fine.

However, in one state, the state_task must continually sample the ADC and notify at a rate much faster than the 5S. I have attempted to do this just by using

MeasurementService_SetParameter(MS_MEASUREMENT_ID, sizeof(testValue), &testValue );

But this causes the task to hang, If I comment out the above call then the task keeps working as it should (obviously without the notification) but with the line it just freezes.

Using BDS I set.
Read = write = sigened write = write without response = indicate = broadcast = EXCLUDED
Notify = MANDATORY

Any Idea what I am missing? or what I have done incorrectly?

over 8 years ago

0 Evan W over 8 years ago

TI__Mastermind 41650 points

Hi Sam,

Are you using the CC2640R2F or the CC2640? Which SDK and what version are you using? At what rate is your adc sending notifications?

Can you pause the application when it hangs and provide a snapshot of your call stack?

0 Evan W over 8 years ago in reply to Evan W

TI__Mastermind 41650 points

You may see if slowing down the sample rate of your adc and hence the ble notifications to see if it continues to work.

0 Sam Pattemore over 8 years ago in reply to Evan W

Intellectual 480 points

Thanks for your reply Evan

Using CC2640R2F
SDK 1.50.00.58

As I am fault finding I am no longer sampling on the ADC and instead just trying to transmit a constant "unit16_t = 25"
For interval transmissions I send "unit16_t = 50" @ 1/50S

I would love to send you a snapshot of my call stack but I don't know how to do that.

Regards

0 Sam Pattemore over 8 years ago in reply to Evan W

Intellectual 480 points

Sorry I might be way off, but is this what you are looking for? if not, then what is a "call stack" and how do I get a snapshot of it?

Regards

0 Sam Pattemore over 8 years ago in reply to Sam Pattemore

Intellectual 480 points

I should have also mentioned.

MeasurementService_SetParameter(MS_MEASUREMENT_ID, sizeof(testValue), &testValue );
calls
GattServApp_ProcessCharCfg () successfully
which in turn calls
gattServApp_SendNotiInd() successfully
which in turn calls
status = GATT_Notification( connHandle, &noti, authenticated );

but I dont know how to pursue the program from there. when i hover over the call parameters i get this
connHandle value = 0
noti handle = 47
noti len = 2
noti pValue = 0x200034E8
authenticated = . ie "."

I dont know what these values should be but they dont seem correct.

0 Evan W over 8 years ago in reply to Sam Pattemore

TI__Mastermind 41650 points

Sam,

Can you give me more information about the mainCProLoop? What code is in there? It looks like that task is blocking all other tasks from running.

0 Sam Pattemore over 8 years ago in reply to Evan W

Intellectual 480 points

Hi Evan, That is the main state machine. from there, one of the states is Active_task, and Active_Task is where SetParameter() is called and as menioned in the origional post SetParameter is causing the blocking/hanging.
Regards

0 Sam Pattemore over 8 years ago

Intellectual 480 points

I had some partial success.

Instead of calling SetParameter()
I Called
User_enqueueCharDataMsg()
this seems to work but might also add a lot of overhead.
At least I might be able to use this learning to discover what else needs to be done before calling SetParameter

0 Evan W over 8 years ago in reply to Sam Pattemore

TI__Mastermind 41650 points

Sam,

Thanks for an update. I'll mark this as resolved for now.

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CCS/CC2640: Task hanging on BLE Notification