CC2650: Seconds_set() usages

Alejandra Gomez

Part Number: CC2650

Hi,

I'm working with the CC2650, that is transmitting movement data (accelerometer and gyroscope) to a propietary app.

I have slightly modified the movement service of the Sensortag_CC2650 _app to send a UNIX Timestamp in milliseconds together with the accelerometer and gyroscope data.

To do this I'm using Seconds_Set() and Seconds_getTime().

Since manually setting Seconds_Set() introduces some small delay, I was wondering if it makes sense to send a timestamp from the app, to be used as input on Seconds_Set() everytime the device connects to the app.

In that case, what would be the best way to proceed?

Thanks in advance,

Alejandra

over 6 years ago

0 IUsedToBeARealPerson (M-W) over 6 years ago

TI__Guru 58425 points

Hi Alejandra,

This makes sense if you want to sync the clock of the two devices. In this case, you could add this as part of your profile as a characteristic (or make a new one for this). You then, when writing this characteristic, invoke Seconds_set() with the value.

0 Alejandra Gomez over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Intellectual 670 points

Hi M-W,

I have created a new characteristic "TIME" on the movement service profile, following this: software-dl.ti.com/.../ble_01_custom_profile.html

And when I use LightBlue application I can see this characteristic and I can read/write on it.

But I'm not sure about how to proceed now how to invoke Seconds_set(),

Could you please guide me through this?

Best,
Alejandra

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to Alejandra Gomez

TI__Guru 58425 points

Hi Alejandra,

There should be a <MyService>_RegisterAppCBs() function generated as part of you characteristic. You can use this to register a callback function for when the characteristic value gets written to by the central.

You can see this getting invoken inside the <myService>_WriteAttrCB which is the GETTServ write callback registered during <MyService>_AddService(). This of course assume that you used the embedded generator in the training.

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CC2650: Seconds_set() usages