Connecting ADXL345 and Raspberry Pi using SPI or I2C

Is there a way in which I can download the .m file used in the video 'Using MATLAB and Raspberry Pi with an Accelerometer', so that I can see how to read the data from an acclerometer via SPI within MATLAB? Or if I could get some form of help with writing my own I would be grateful.

Link to the video: https://uk.mathworks.com/videos/using-matlab-and-raspberry-pi-with-an-accelerometer-94189.html

Alternatively, is there anywhere I could find help connecting reading the same accelerometer via I2C? I can connect it via I2C, gain the address of the ADXL345 as 0x53, but then I can't see how to read the data. I know that the x,y and z data is on 0x32 to 0x37, but I can't see how to return the data within MATLAB. I find the video 'Using MATLAB and Raspberry Pi with an I2C Sensor' somewhat useful until, again it comes to reading the data. Link to video:

https://uk.mathworks.com/videos/using-matlab-and-raspberry-pi-with-an-i2c-sensor-94194.html

I am fairly new to the Raspberry Pi and connecting components via SPI/I2C, so would be very grateful for a simplified explanation/point in the right direction where I can learn more.

[Jayaram Theegala]

You may find the following MATLAB documentation helpful to get started with MATLAB and Raspberry Pi's I2C interface:

https://www.mathworks.com/help/supportpkg/raspberrypiio/ug/use-the-i2c-interface-on-the-raspberry-pi-hardware.html

Although the above example does not talk about ADXL345 (the device you are intending to use), it can be a good starting point. Once you are comfortable with the MATLAB's interface for Raspberry pi, you can look into your device's datasheet to know what registers you have to set to use the accelerometer and get the data

[Darren Williams]

Hi Jayaram, thank you for your help, I have looked in to the registers and have discovered which ones I need to use and what values to write to these registers, and I have produced the code:

However, it just gives me a value of 0? Does this mean that the connection is not established properly? I have run an example code in Python on the Raspbian Pi itself and that appears to work. However this code does seem to obtain block data in a block of 6 bytes from adress '0x53' and register '0x32', is there a method of returning block data from the device within MATLAB? Again it could just be me missing something in the code, or my poor knowledge in this area...

Thanks in advance!

[Arvind Srivastav]

Hi Darren, I'm having a similar problem. Is the output of "address = char(scanI2CBus(rpi))" non-empty in your case?