Reading battery information through adp536x PMIC in Thingy91

[Adeel]

Hi Dev team,

I have been working on a Thingy91and I was trying to read out the battery voltage of the device. 

I was able to do that through the modem using the MODEM_INFO library.

However, I would like to know how could I get the battery information through the adp536x PMIC. 

I tried to search in the adp536x.c file for any relevant functions but could not find any.

Is there any specific function available to read the battery information through the PMIC ?

Regards,

Adeel.

[Carl Richard]

Hi, Adeel!

I've asked the developers about this, but from what I can see it's not implemented. From reading the ADP5360 datasheet it seems like it shouldn't be too much of a challenge to add support for reading the VBAT_READ register. I suggest looking into the source code (adp536x.c) and using the already implemented adp536x_reg_read(...) function.

Best regards,
Carl Richard

[Adeel]

Hi Carl,

Thanks for the lead. I will try this and let you know .

Could you please let me know if you get any word from the developers ?

Regards,

Adeel.

[Carl Richard]

Hi again!

Some work on this actually have been done in the past. I have attached a driver and header file with the required changes implemented, and a module using the driver. Note that this isn't tested with the newest version of NCS/Zephyr, so some changes (especially in the module) are likely required. Notify me if you face any issues!

5633.adp536x_with_battery_monitor.zip

Best regards,
Carl Richard

[Adeel]

Hi Carl,

Thanks for the files. I noticed that the driver and header file that you gave me (of adp536) has some extra functions that are not present in the current adp536 files in the latest version. 

I will try to use the module out and let you know but I was curious to know if there is any specific reason that the library files are different from what it is in NCS v1.5.0 and what you sent me. 

Regards,

Adeel.

[Carl Richard]

Hi again, Adeel!

You are correct. This is code that was meant to be used with the asset_tracker, but it was ultimately left out. Hence, there is no guarantee that it works, but most of it should!

Best regards,
Carl Richard

[Adeel]

Hi Carl,

Thanks for the clarification on this . I will try it out and let you know.

Regards,

Adeel.

[Carl Richard]

My pleasure! Good luck.

Best regards,
Carl Richard

[Adeel]

Hi Carl,

I tried using your code and I added the extra functions of the adp536x that were present in your files to the existing library. 

I copied the battery_monitor.c code into my code and tried to call the : battery_monitor_read(uint8_t *buf) function in my main but I got a value of 0.

I think I am calling it in a wrong way. Could you let me know what is the right way to call this function in the main() part of my code (or) could you point me out as to how it was used before in the old asset tracker examples.

Regards,

Adeel.

[Carl Richard]

Hi, Adeel!

Did you call battery_monitor_init first? And did the compiler throw any build warnings/errors? I'll check if we have some more sample code!

Best regards,
Carl Richard