How i change app timer time using android app?

[vishal]

Hello,

We are using nRF52832 DK, nRF52 sdk15.0 with SES IDE in windows 10. Currently we have senor network which is trigger every 1 Hr and send data trigger time set in program flash memory.

We want to change the sensor trigger time using android app which will connect to our sensor node and send time to set in device.

So how we can update application timer time in sensor node by using android app. The sensor trigger time is different and set it by user like 30 min, 1Hr, 3 Hr, 8Hr, 1 day etc.

Is it need to store in flash by ble android app or it can be do by other way..

Please anyone provide me example code and tutorial link so we can do quickly. In sensor node we are using ble_app_uart example and modified by own application.

Looking forward your response.!!

Thanks in advanced....!!!! 

[Mttrinh]

Hi,

Unfortunately, we do not have an example or tutorial for this specific case. 

You can update your application timer by sending the value you want to the RX characteristic. You can do this in nRF Connect. Then you just have to store this value as the new trigger time before going back to sleep.

[Mttrinh]

Hi,

Yes it is possible, like you said after receiving the value, you can store it in flash so that the value doesn't reset when powering off the sensor device. 

Regarding the flash issue, I suggest you create a new ticket on Devzone with more details on the flash issue.

[awneil]

Flash is the only available non-volatile storage  on nRF52 devices - so, if you want something else, you are going to have to add it externally.

[awneil]

The nRF5 SDK provides 'Flash Storage' and 'Flash Data Storage' libraries to help you with storing data in flash:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_fds.html?cp=4_0_0_3_52

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_fstorage.html?cp=4_0_0_3_53

[vishal]

Thanks awneil for your suggestion,

Is any register in nRF52832 to store variable value into directly flash without adding any other f storage library or something other also. 

[vishal]

Hi Mttrinh,

Will please also tell me what is the maximum time we can set in app timer. We need to set sensor wake up time 1 week or may be max 2 week. 

How i can set large app timer time ticks.. I am using sdk for nRF52 version 15.0 latest and SD132.

Thanks...

[Mttrinh]

Hi,

We have a flash write example in the SDK that accesses the flash directly. But direct access to flash is restricted when using the softdevice. We recommend you to use FDS instead. It is a simple file system, that will handle write and erase for you.  You don't need to worry about the address you store the variable or how you back up data when erasing a page. Have a look at this post for more details.

The maximum time you can put in the app timer depends on the prescaler of RTC1. The maximum is limited by the time the counter wraps around. I suggest you have a look at this for more details about the application timer.

[vishal]

Thanks for provided flash write examples.

Now i am able to write some data in flash and read as well. But regarding app timer time save in flash as per receiving from android connection still confused.

How i can saved new timer overwrite on old time will please provide small program snippet for read time from android connection in static void nus_data_handler(ble_nus_evt_t * p_evt)
so that i can understand.   Also how i can call write function after getting data from android and then update it in timer variable.

Thanks...!!!

[Mttrinh]

It seems like you opened a new ticket, I suggest you continue the case there.

[vishal]

Yes, Thank you so much Mttrinh for your great help...!!