Online Compiler: rui_device_get_battery_level undefined

[FWilke (Fredrik Wilke)]

Hi there,

I´m working on a custom firmware for the RAK811-H. Using Bootloader V3.0.2 and the example application provided on github as basis, I was able to write a simple script implementing the rui_gpio-API, which works perfectly well.

The next step was to make use of “rui_device_get_battery_level(float *voltage)” as defined in rui.h. Sadly though the Online Compiler returned this:
_build/app_RAK811.o: In function app_loop': /home/rui/vdb/rui_root/user/[email protected]/build/stm/RUI/build/..//Source/stm/STML151/application/app_RAK811.c:97: undefined reference to rui_device_get_battery_level’
collect2: error: ld returned 1 exit status
stm/Makefile_stm32l151cb:254: recipe for target ‘_build/stm_xx.elf’ failed
make: *** [_build/stm_xx.elf] Error 1

Is there an issue with the RUI implementation for the RAK811-H or is this method deliberately not implemented as the RAK811 simply doesn´t support it?

Best,
Fredrik

[Nicholas]

Dear Fredrik，

You can refer RAK5205 code,Because RAK811 does not use the battery power.

[FWilke (Fredrik Wilke)]

Ok, Thank you!
Is there any documentation about which modules support which functions from rui.h?

The fact that it is described as a common header suggests that all functions are supported by all modules. Being told the opposite is a little confusing.

[Nicholas]

Dear FWilke，

Please refer this web：
https://docs.rakwireless.com/RUI/#overview

Refer to RAK5205 just to express, he has an example to read the battery power, while RAK811 needs you to add by yourself.

Best regards!