ESP32-S3 ESP-IDF - VL53L4CD I2C, IO.WriteReg/Address indicators null, Guru Meditation

Good day, I am programming an esp32s3 microprocessor in an ESP-IDF environment. I would like to connect it with one sensor (in the future with four) TOF VL53L4CD from ST Microelectronics (LINK1). I managed to establish communication with the sensor in the Arduino IDE, it works fine there without problems. In ESP-IDF I also manage to communicate with the sensor via i2c. However, I am a beginner and I am having a lot of problems implementing the library for this sensor (LINK2). I get an error when calling the function VL53L4CD_SetI2CAddress() :

I get a Guru Meditation error when calling this function:


Line 48 in the platform.c file is :

I used the debugger and it turned out that the indices and have the value 0x00 despite their previous declaration :
If there is a knowledgeable person on the forum who would be willing to help me, I would be grateful. I am using ESP_IDF via Visual Studio Code

, I have imported all the files from the sensor library into the main folder for convenience I hope this is not a problem:

I will be happy to post additional details if needed.




Kind regards Stanisław Kaczmarek





LINK1: https://www.st.com/resource/en/datasheet/vl53l4cd.pdf
LINK2: https://github.com/STMicroelectronics/x-cube-tof1
The whole code (in the dirt) :
[i]AI: Could you show how you create and initialise the dev structure (e.g. VL53L4CD_Dev_t) and how you pass it to the VL53L4CD_SetI2CAddress function? I'm referring to the bit of code where you assign the pointer to the IO and call the library functions.

VL53L4CD_IO_t io_config = {
.Init = My_I2C_Init,
.DeInit = My_I2C_DeInit,
.Address = 0x29,
.WriteReg = My_WriteReg,
.ReadReg = My_ReadReg,
.GetTick = My_GetTick
};
AI: Have you made any changes to the VL53L4CD library files or the way it integrates into the ESP-IDF project (e.g. modifications to structures, header files, or other unusual steps when importing into the main folder)? If so, please describe them briefly.
I have only added additional logs to facilitate debugging via the serial port, I have not changed the mechanics of the code.

What is a dev_t? Rather than an address, but a pointer to an object?

Why are you setting it to 0x29?

It should rather be an object created by malloc() or by a function designed for this purpose, I am not familiar with this library.

As far as I know this dev_t is a pointer to a VL53L4CD_Object_t:
this is the code from the platform.h file.
Actually I guess it doesn't make sense to write any value like that since it's a pointer, I corrected the code to make it more readable

Since it is a pointer to an object of type VL53L4CD_Object_t, by setting it to 0x29 you are pointing to a memory cell with that address, no wonder there is a crash.

Is your new code complete?

For example, I don't see you using there:

Looking around the web, there is a function for this:
https://github.com/search?q=VL53L4CD_RegisterBusIO&type=code

After removing the dev indicator definition
My dev->IO.WriteReg is still 0x00, is there any possibility to write some value to this object ?

Sorry for my non-technical language, I am just learning

The problem is more on the side of C-language knowledge, not ESP.

You have in the code:

Dev_t is defined as a pointer to this object, a pointer uninitialised as a global variable has a value of 0. It points into the void, there is no object.

For this object to exist, you must first create it. You can do this by using malloc.

You can also make this object as a global variable, e.g:

and then instead of dev give &myObject(pointer to myObject).

I'm sure it will help you a lot if you read up on pointers in C, etc, as this limits your work with ESP.

You can also look generally at how others are using this library, e.g. by searching on GitHub:

Thank you, I will try to learn the c language, I have ordered 3 books on the subject and will read in the coming days. I managed to solve the guru meditation error by following the tips, I still have minor hardware issues with the sensor but I think I can handle that myself .
So thank you very much for your help. I still have a question if I can contact you when I have other problems with the ESP-IDF or should I post on the forum ?

You can always post boldly in the forum, and you can give me a link on PW to the topic so I can find it quicker.