Problem running code in release mode when NRF_LOG_BACKEND_UART_ENABLED and NRF_LOG are disabled

[JC9191]

Hello,

I am having an issue with running my application in release mode. It will only run when NRF_LOG_ENABLED = 1 and NRF_LOG_BACKEND_UART_ENABLED = 1. I can run my debug configuration with both of these disabled. I would like to disable them as it reduces power consumption of my device. I can run the debugger in the release config and the device will advertise and i can connect to it but it doesn't work when i flash the hex file.

I've tried setting optimization level to 'none' for release build and I've tried disabling and enabling the logs and uart.

Any help with this is appreciated.

Thanks

[JC9191]

Hello,

Thanks for your response.

When i disable the UART and NRF Log I can build the project in release mode but when i flash the hex file the device will not advertise. As soon as i enable the log and UART the device will advertise and behave like normal but draw more power than we would like.

I can run the debugger with the UART and NRF logs disabled and the device advertises as per normal.

I will investigate the HFCLK.

Thanks

[Hung Bui]

Hi again, 
Yes that's why I suggested to use GPIO or otherway of debugging to check where the code stop. Have you tried to do RTT log instead of UART ?

[JC9191]

Hello,

If i enable RTT and NRF Log and disable UART the device will not advertise when I run the code. As soon as i connect to J Link RTT viewer the device starts to advertise. Similarly, if i disable RTT the device won't advertise but it will appear as soon as the RTT viewer is connected.

I can try the GPIO debug method.

Thanks

[Hung Bui]

Please let us know more about your application. Do you see the same problem when testing with our examples ? 

[Hung Bui]

P/S: Please also do a nrfjprog --readregs . So we have a snapshot of the registers that may help. 

[JC9191]

Hello,

The application takes an adc and accelerometer value and transmits over ble every 50 ms then goes to sleep.

I can run the blinky example and see it advertise when in release mode.

When i build and run in release mode the register values are:

R0: 0x000073C0
R1: 0x00000000
R2: 0x00000040
R3: 0x00000001
R4: 0x0000011A
R5: 0x0002B9D1
R6: 0x2000351D
R7: 0x20003508
R8: 0x00000000
R9: 0x00000000
R10: 0x00000000
R11: 0x00000000
R12: 0x200034E0
SP: 0x2000FFB0
LR: 0x0002861D
PC: 0x0002B9D2
xPSR: 0x21000000
MSP: 0x2000FFB0
PSP: 0x00000000
RAZ: 0x00000000
CFBP: 0x00000000
APSR: 0x20000000
EPSR: 0x01000000
IPSR: 0x00000000

Thanks