I2C configuration (zephyr,concat-buf-size = <65536> and zephyr,flash-buf-max-size = <65536>) is throwing stack overflow error

[PassionPioneer]

HI Nordic Team,

I am developing a firmware to interface CH101 sensor, which has a firmware loading of 2048 bytes of data over I2C.

I declared buffer size as below in device tree and in program I have given 128 bytes transfer in single I2C write call then it worked:

I want to write entire 2048 bytes in single I2C transfer, then I increased the buffer size to 65536 as mentioned below in device tree:

...

this is the error I am facing,

Q1: Will I2C supports buffer size of maxmium 65536?

Q2: If I2C buffer max size supports 65536 then why I2C write for 2048 bytes is getting failed? In fact, the board is getting reset when I declare this much buffer size when the particular I2C_write is called.

As I am running out of time, I would expect quick response.

Br,

Naveen.

[Håkon Alseth]

Hi,

 

I increased the buffer size to 65536 as mentioned below in device tree:

The TWIM EasyDMA is 16 bit, meaning 65535 is the max size.

 

Based on the error message, it seems that you've set it to 65536, which overflows into 0 for a 16 bit value.

 

Kind regards,

Håkon

[PassionPioneer]

Okay, I tried 65535, there is no reset on board however the I2C call is not performing.

I tried 1024 and 2048 bytes transfer in single call.

[PassionPioneer]

Hi,

Is there any update?

[Håkon Alseth]

Hi,

 

Could you share your log output?

 

Is there any reason why you are setting up 64kB instead of your max message size (ie. 2048 bytes) ?

 

Kind regards,

Håkon

[PassionPioneer]

Hi,

I tried 2048, it didn't work. 

I am working on ch101 ultrasonic sensor, when I use 2048 the firmware is getting stuck and giving any reasonable log.

[PassionPioneer]

Log with buffer size 65535/2048

Log when buffer size is 1024, firmware write is OK

[PassionPioneer]

Hi,

Is there any update on this?