Step 6: Build, program, and observe the outputs
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Every subsequent pressing of switch SW0 on SAM E70 Xplained Ultra Evaluation Kit changes the default sampling rate to 2 seconds, 4 seconds, and 500 ms and back to 1 second in cyclic order as shown below.
While the temperature sampling rate changes on every switch SW0 press, notice the LED3 toggling at the same sampling rate.
Results
You observed that the application displayed the current room temperature values on the serial terminal every 500 milliseconds. You were able to change the temperature sampling values dynamically by pressing a user switch on the development kit. You could exercise sampling changes to 1 second, 2 seconds, and 4 seconds and cycle back to 500 milliseconds every time you pressed the user switch. You also observed that a user LED was toggled every time the current temperature is displayed on the serial terminal.
Analysis
You have successfully created your first application using MPLAB Harmony v3 on the SAM E70 microcontroller. Your application used all the fundamental elements that go in building a real-time application. Your application successfully read temperature sensor values and displayed them periodically over a serial terminal on a PC. The application also took user input by pressing a switch on the development board.
In this application, you used MPLAB® Code Configurator (MCC) to configure SAM E70 and to use the MPLAB Harmony v3 Framework. You used the clock configurator to set up the CPU clock and Timer Clock (TC). You configured Two-Wire Interfaces (TWIHS) (I²C), Universal Synchronous Asynchronous Receiver Transmitter 1 (USART1), TC, and Parallel Input/Output (PIO) Peripheral Libraries (PLIBs). You also configured Direct Memory Access (DMA) using the DMA configurator. You used Pin Configurator to set up the pins for LED and switch functions.
Conclusions
This tutorial provided you the training of configuring and using all the fundamental components needed to build a real-time application on a SAM E70 microcontroller with MPLAB Harmony v3 Framework. As a next step, you may customize this application and reconfigure some of the components used in this tutorial. You could also add new components (PLIBs, etc) to enhance this application to realize your end application.