i2c protocol on nrf52832 development kit.

[kunal]

Hi, , 

I am working on the nrf52832 development kit and want to program it as an I2C master. I have download the nRF SDK v12.3 but I am unable to understand the code written, since I am beginner in embedded systems. However, I wish to write my own code so that the development kit can act as an  I2C master, ble mesh node, and provide some DSP applications.

Can someone tell me how do I exactly "read" the code? I am going on the function definitions used in the "twi master with twi slave" project, but they seem to be never ending loops and I am getting lost to be honest. I want to write my own program for the above application and want to know which headers to include, how to write my own functions, how to set the twi slave address, clock frequency, etc.

I also want to know where the incoming data from the twi slave is stored, and how to change the location of the code.

Sorry for the broad question, would appreciate help from experts.

Thanks. :)

[haakonsh]

Hey Kunal,

I'm glad you've chosen to do a project in embedded. It's going to be a steep learning curve, but you'll get there eventually. 

First off, ble mesh has it's own SDK, nRF5 SDK for Mesh. Second, the SDK documentation along with the Product Specification will be your go-to place for information. Learning to read the API Reference and Libraries documentation is critical in order to gain a proper understanding of how you're supposed to use the SDK. You can of course "just read the code", but at some point the code complexity will overwhelm a beginner or even an intermediate embedded engineer. The product specification will give you detailed information on the MCU capabilities and limitations, as well as describing the register interface of its various components. You don't have to delve into every minute detail, but I suggest you read TWI — I2C compatible two-wire interface and TWIM — I2C compatible two-wire interface master with EasyDMA when you are learning the I2C/TWI drivers. 

ARM provides some DSP libraries, see https://github.com/ARM-software/CMSIS_5, and the arm_math.h header file. 

I suggest you start by reading Introduction to nRF5 SDK for Mesh and Getting started before you do anything else. 

Cheers,

Håkon.