return error when press BUTTON_0 on ble_app_uart project

[ponyma]

Dear Experts:

Hardware Version :Nordic PCA 10040 1.2.4 

SDK Version: nRF5_SDK_15.3.0

Project: ble_app_uart

None code will be modified in the ble_app_uart project. First build program,then press the 'start/stop debug session' button to start project under debug mode. After the project running,  press BUTTON_0 which labeled  'Button_1' in board. The project will stop and popup error. 

I analyse this issue simply: when press BUTTON_0, BSP_EVENT_SLEEP event will be captured and processed. In the process function sleep_mode_enter(), the error would be return in calling sd_power_system_off and the error code is 0x00002006.  In this project, there is no error when pressing other button.

But in project ble_app_bps, there is no this issue when pressing BUTTON_0.  

Please help me to check this problem: why the error is returned  when pressing BUTTON_0 in ble_app_uart project. 

[awneil]

ponyma said:

The project will stop and popup error

So what error, exactly, does it pop up?

Presumably, this is an error from your IDE ?

If you're on Windows, you can capture a screenshot of the current window - eg, the error message - by pressing Alt+PrintScreen.

ponyma said:

when press BUTTON_0, BSP_EVENT_SLEEP event will be captured and processed

So that puts the CPU to sleep.

Putting the CPU to sleep will make the debugger lose its connection to the target;  so what you describe sounds like expected behaviour - not an error at all?

[ponyma]

My description may not be very exactly . Please check the blow snapshot :

In my opinion, it may not  be the right behavior :

1. In ble_app_bps project, the same error can't occur when pressing BUTTON_0.

2. in ble_app_uart project, the same error can't occur when pressing other buttons.

[Simonr]

Hi

This post explains what happens in system off mode in debug mode. The reason ble_app_uart crashes when you set it to sleep in debug mode is that the emulated system off goes into a loop within the UART files in the SDK which I assume conflicts with the UART application and causes the error you're experiencing. The sleep function works just fine in normal mode.

Best regards,

Simon