app: ERROR 8198 at err_code = sd_power_system_off();

[alex kim]

Hi,

I am using 

• PCA10040
• SDK 15.3.0
• Keil IDE
• The soft device is S112 
• JLinkRTTViewer for debug
• nRF5_SDK_15.3.0_59ac345\examples\ble_peripheral\ble_app_uart\pca10040e\s112\arm5_no_packs

I'm testing system_off.

I download ble_app_uart to DK and after 3 minutes I get an error at err_code = sd_power_system_off ().

Please advise.

Alex

[Ivan Herrera]

If you look at the documentation it gives you:

/**@brief Puts the chip in System OFF mode.
 *
 * @retval ::NRF_ERROR_SOC_POWER_OFF_SHOULD_NOT_RETURN
 */
SVCALL(SD_POWER_SYSTEM_OFF, uint32_t, sd_power_system_off(void));

NRF_ERROR_SOC_POWER_OFF_SHOULD_NOT_RETURN (error 8198) is the expected error_code when you're calling sd_power_system_off(). If you're not debugging, the system should in fact go into a power_off state.

[alex kim]

Hi, Ivan

err_code = sd_power_system_off();
APP_ERROR_CHECK(err_code);

In the above statement, the APP_ERROR_CHECK (err_code) statement confused me.

Is the above sentence unnecessary?

Should it always be reset to wake up system_off ()?

If I use GPIO Interrupt, can I turn on the system without reset?

Best regards,

Alex

[Vidar Berg]

Hi Alex,

The chip will enter Emulated System OFF mode if it is in debug interface mode, and in that case, immediately return from the sd_power_system_off() call instead of entering sleep. So you need to make sure the debug interface is disabled to properly test System OFF mode on your device. 

[alex kim]

Hi Vidar

Thank you for your kindness.

Best regards,

Alex