Compile VL6180X API in c

[SCADE]

Hello,
I'm trying to get a VL6180X sensor to work.
I've downloaded the latest API: en.VL6180_API_V1.3.0.zip
My goal is to make the sensor work in I2c on a Raspberry PI in the c or c++ language.
But I can't compile my code, or rather compile the api into a library.
Where can I find an example of a makefile or command to do this?

Thanks for your help.

[Andrew Neil]

Did you mean to ask a question?

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

EDIT:  OP has now been updated to include a question

[Andrew Neil]

---

@SCADE wrote:

But I can't compile my code, or rather compile the api into a library.

---

What problem(s), exactly, are you facing?

What have you tried so far?

Again, please see:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

[SCADE]

Ok so here is my test.cpp file :

#include <iostream>
#include <unistd.h>
#include "vl6180_api.h"

int main()
{
  VL6180Dev_t tof = 0x29;

  VL6180_WaitDeviceBooted(tof);
  VL6180_InitData(tof);
  VL6180_Prepare(tof);

  for (size_t i = 0; i < 10; i++)
  {

    VL6180_RangeData_t rangeData;
    VL6180_RangePollMeasurement(tof, &rangeData);

    printf("Range: %d\n", rangeData.range_mm);
  }

  VL6180_FilterSetState(tof, 1);

  return 0;
}

file structure : 
api_vl6180x_1.4.0/
api_vl6180x_1.4.0/config
api_vl6180x_1.4.0/config/vl6180_cfg.h
api_vl6180x_1.4.0/core
api_vl6180x_1.4.0/core/inc
api_vl6180x_1.4.0/core/inc/vl6180_def.h
api_vl6180x_1.4.0/core/inc/vl6180_api.h
api_vl6180x_1.4.0/core/src
api_vl6180x_1.4.0/core/src/vl6180_api.c
api_vl6180x_1.4.0/platform
api_vl6180x_1.4.0/platform/template
api_vl6180x_1.4.0/platform/template/vl6180_platform.h
api_vl6180x_1.4.0/platform/template/vl6180_types.h
api_vl6180x_1.4.0/platform/cci-i2c
api_vl6180x_1.4.0/platform/cci-i2c/vl6180_i2c.c
api_vl6180x_1.4.0/platform/cci-i2c/vl6180_i2c.h

and finally compile command :
g++ -o test test.cpp api_vl6180x_1.4.0/core/src/*.c api_vl6180x_1.4.0/platform/cci-i2c/*.c -I api_vl6180x_1.4.0/core/inc/ -I api_vl6180x_1.4.0/platform/template/ -I api_vl6180x_1.4.0/config/ -lwiringPi

Error :
/usr/bin/ld: /tmp/ccnVF5wY.o: in function `VL6180_WaitDeviceBooted':
vl6180_api.c:(.text+0x6c): undefined reference to `VL6180_RdByte' ...................................... 

[Andrew Neil]

---

@SCADE wrote:

Error :
/usr/bin/ld: /tmp/ccnVF5wY.o: in function `VL6180_WaitDeviceBooted':
vl6180_api.c:(.text+0x6c): undefined reference to `VL6180_RdByte' ...................................... 

---

"undefined reference" is a linker error.

It means that you have omitted to provide a definition of that function - either as source code, or as a pre-built binary library.

Probably, you have #included a header which just declares that function (ie, just provides a prototype) - hence the compiler is happy - but haven't added the necessary source or pre-built binary library to your project - so the link fails.

#UdefinedReference

EDIT:

Looks like these are the docs you need:

[SCADE]

This is also what I understand the definition seems to be missing, however it is present in

for VL6180_RdByte :
Function declaration: vl6180_api.h
Function definition: vl6180_i2c.c
Function usage: vl6180_api.c

And I seem to be integrating them all correctly in my compile command

[John E KVAM]

When we write the code you are using, we don't know what MCU ( or CPU) you have.

So, we write the code all the way to RdByte() and WrByte() and then WE STOP.

It's up to you to populate those functions.

Have a look at the platform.c function and Platform.h

Notice they are basically empty?

There are examples of VL6180 projects on Linux - on GitHub.

Download one of those and borrow the Platform.c file. 

You basically have to insert a IOCTL I2C write function into RdByte(). 

- john

[SCADE]

Thanks for your reply,

The API documentation recommends using cci-i2c (should work on raspberry??)
In the files of the cci-i2c folder there are the functions you say are missing but that I can't get to work ;(

And on Github I couldn't find anything relevant.