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32-bit MCU Reference Applications
SAM E70 Xplained Ultra Evaluation Kit
Getting Started with FreeRTOS
3

Getting Started Application using Harmony v3 Drivers and FreeRTOS on SAM E70 Xplained Ultra Evaluation Kit

Download

Description:

The application reads the current room temperature from the temperature sensor on the I/O1 Xplained Pro Extension Kit. The temperature reading is displayed on a serial console periodically every second. Further, the application writes the temperature readings to EEPROM. When a character is entered on the console, the last five written temperature values are read from the EEPROM and displayed on the console. Also, an LED (LED3) is toggled every time the temperature is displayed on the serial console.

Modules/Technology Used:

  • Peripheral Modules
    • PORTS
    • USART
    • Timer
    • XDMAC
  • Drivers
    • TWIHS(I2C)
    • USART
  • System Services
    • Timer
  • Third Party Libraries
    • FreeRTOS

Hardware Used:

Software/Tools Used:

This project has been verified to work with the following versions of software tools:

Refer Project Manifest present in harmony-manifest-success.yml under the project folder firmware/src/config/sam_e70_xult

  • Refer the Release Notes to know the MPLAB X IDE and MCC Plugin version. Alternatively, Click Here.
  • Any Serial Terminal application like Tera Term terminal application.

Because Microchip regularly update tools, occasionally issue(s) could be discovered while using the newer versions of the tools. If the project doesn’t seem to work and version incompatibility is suspected, It is recommended to double-check and use the same versions that the project was tested with. To download original version of MPLAB Harmony v3 packages, refer to document How to Use the MPLAB Harmony v3 Project Manifest Feature

Setup:

  • Verify that the temperature sensor (I/O1 Xplained Pro Extension Kit) is connected to Extension Header 1 (EXT1) on the SAM E70 Xplained Ultra Evaluation Kit

  • The SAM E70 Xplained Ultra Evaluation Kit allows the Embedded Debugger (EDBG) to be used for debugging. Connect the Type-A male to micro-B USB cable to the micro-B DEBUG USB port to power and debug the SAM E70 Xplained Ultra Evaluation Kit.

Hardware Modification:

  • IO1 Xplained Pro features Microchip’s AT30TSE758 temperature sensor chip with an 8 kbit serial EEPROM. The temperature sensor has two TWI addresses: one for the temperature sensor and one for the EEPROM. The A2 address line of TWI must be soldered to 0. This is done to modify the address of the EEPROM on the I/O1 Xplained Pro Extension Kit so that it does not conflict with the address of EEPROM on SAM E70 Xplained Evaluation Kit. The modification changes the address of temperature sensor to 0x4B and EEPROM to 0x50. These modified addresses are used in this demo application

Programming hex file:

The pre-built hex file can be programmed by following the below steps

Steps to program the hex file

  • Open MPLAB X IDE
  • Close all existing projects in IDE, if any project is opened.
  • Go to File -> Import -> Hex/ELF File
  • In the "Import Image File" window, Step 1 - Create Prebuilt Project, click the "Browse" button to select the prebuilt hex file.
  • Select Device has "ATSAME70Q21B"
  • Ensure the proper tool is selected under "Hardware Tool"
  • Click on "Next" button
  • In the "Import Image File" window, Step 2 - Select Project Name and Folder, select appropriate project name and folder
  • Click on "Finish" button
  • In MPLAB X IDE, click on "Make and Program Device" Button. The device gets programmed in sometime.
  • Follow the steps in "Running the Demo" section below

Programming/Debugging Application Project:

  • Open the project (getting_started_freertos\firmware\drivers_freertos_sam_e70_xult.X) in MPLAB X IDE
  • Ensure "SAM E70 Xplained Ultra" is selected as hardware tool to program/debug the application
  • Build the code and program the device by clicking on the "Make and Program Device" button in MPLAB X IDE tool bar
  • Follow the steps in "Running the Demo" section below

Running the Demo:

  • Open the Tera Term terminal application on your PC (from the Windows® Start menu by pressing the Start button)

  • Change the baud rate to 115200

  • You should see the temperature values (in °F) being displayed on the terminal every 500 milliseconds, as shown below

  • Also, notice the LED3 blinking at 1 second rate

  • Press any character on the terminal to display the last five values written to the EEPROM

- You may vary the temperature by placing your finger on the temperature sensor (for a few seconds)

Comments:

Revision:

  • v1.6.0 - Regenerated and tested the application
  • v1.5.0 - Removed MHC support, regenerated and tested application.
  • v1.4.0 - Added MCC support, regenerated and tested application.
  • v1.3.0 - Regenerated and tested application.
  • v1.2.0 - Regenerated and tested application.
  • v1.1.0 - Regenerated and tested application.
  • v1.0.0 - Released demo application