Module B3: RTIC

Slides

The goal of this exercise is to get acquainted with RTIC. Use your experience (and code) from parts B1 and B2.

B3 Simple RTIC app

LIS3DH accelerometer connection

First, let's wire up the LIS3DH accelerometer for I2C usage. We'll connect the LIS3DH INT1 pin to the nRF's P0.02. Please turn off your DK. Then, wire up the accelerometer, referring to the table below.

Instructions

1. For this exercise, we'll be working in exercises/B3. Inside the src folder, you'll find a couple of files:

   • lib.rs Where all modules are declared. No need to edit
   • hal_import.rs HAL compatibility module. You can leave it as is.
   • acc.rs contains a config_acc function. This function can be used to configure the LIS3DH to raise an interrupt if it experiences acceleration above 1.1g. It uses the lis3dh driver crate in order to do so. All you need to do is pass it a TWIM instance.
   • main.rs Here's where your magic happens. This is a typical RTIC application. It contains several examples of topics we just covered in the talk. You'll find the instructions at the bottom of the init task.

2. Follow the instructions in main.rs.

3. If you're done early, try to get some cool LED animation sequence going using task scheduling.

Resources

• The RTIC book
• nRF-HAL examples
• LIS3DH driver repository
• LIS3DH driver documentation