how to re-adverise without resetting the data in RAM on NRF51822

[sunnyjet16]

Hello, I am using SDK7.1.0 for NRF51822. In my subroutine, I would like to disconnect with the peer device, and re-advertise. But when after re-advertising, I found the data in RAM has been reset. I would like to know some questions as below:

1. Is it supposed to reset the data in RAM when doing re-advertising?
2. If re-advertising will cause reset RAM, is there any method which can do re-advertisement without reset data in RAM? Thanks Alex Chen

[Jørgen Kvalvaag]

Starting and stopping advertising should not reset your RAM.

Most likely, you are developing your code without the DEBUG compile flag set. This will cause your device to perform a full system reset on all assert/error conditions.

Try setting a breakpoint in the assert handler, or recompile your app with the debug flag set.

[ta2]

The SoftDevices have strict timing requirements where certain operations (mostly interrupts I think) need to happen on a schedule.

If you set a breakpoint while a SoftDevice is active, the CPU probably won't be running when the event from the SoftDevice needs to be handled. This results in a timeout and the SoftDevice will throw an error when you continue the CPU.

The default operation for all errors -- if the DEBUG flag is NOT set -- is to call NVIC_SystemReset() which resets the device.

Using your current build setup -- without the DEBUG flag set --, set a breakpoint on main(). I suspect that you will find when you continue from one of your breakpoints that the device will reset and you'll be back at main().

Hope this helps!

--- tom