1.1. Before You Start
Before you start you need to:
Install the latest Smartsnippets Studio
Download the latest SDK for the DA1469x platforms
These can be downloaded from the DA1469x product page.
Additionally, for this tutorial a Pro Development kit is required.
The key goals of this tutorial are to:
Provide a basic understanding of adapters concept
Explain the different APIs and configurations of I2C peripheral adapters
Give a complete sample project demonstrating the usage of I2C peripheral adapters
1.2. I2C Adapters Introduction
This tutorial explains I2C adapter and how to configure the DA1469x family of devices as an I2C master or slave device. The I2C adapter is an intermediate layer between the I2C Low Level Drivers (LLDs) and a user application. It allows the user to utilize the I2C interface in a simpler way than when using APIs from LLDs. The key features of I2C adapter are:
Synchronous read/write operations block the calling freeRTOS task while the operation is performed using semaphores rather than relying on a polling loop approach. This means that while the hardware is busy transferring data, the operating system (OS) scheduler may select another task for execution, utilizing processor time more efficiently. When the transfer has finished, the calling task is released and resumes its execution.
A DMA channel can be used among various peripherals (for example, I2C, UART). Interconnected peripherals may use the same DMA channel if necessary. The adapter takes care of DMA channel resource management.
The I2C adapter ensures that only one external I2C device is accessed on the specific GPIOs selected and uses the specific I2C controller block once all those resources are acquired through the resources management integrated in the Adapters layer.
Adapters are not implemented as separate tasks and should be considered as an additional layer between the application and the LLDs. It is recommended to use adapters for accessing a hardware block.