Creating a Driven Shield Project with MHC

 Objective

This page shows you how to create a Driven Shield Touch MPLAB® Harmony project from scratch.

 Materials

Hardware Tools

Software Tools

 Procedure

1

Create a New Project

Create a new Harmony 3 project

2

Launch MHC

Open the MPLAB Harmony Configurator (MHC) by going to Tools > Embedded > MPLAB Harmony 3 Configurator

OpenMHC.png

3

Touch Library

Add the Touch Library, and when prompted, allow the Real Time Clock (RTC) Peripheral connection.

TouchLibrary.png

4

Open the Touch Configurator

Open the Touch Configurator by going to MHC > Tools > Touch Configuration.

TouchConfiguration.png

5

Add Buttons, Sliders, and Wheels

Add buttons, sliders, and wheels as required and assign the Y lines to each.

​

Driven Shield and Driven Shield+ only function with self-capacitance sensing

Sensors.png
PinSelection.png

6

Configure the Driven Shield

Refer to the "Guide for Timer-based Driven Shield on SAM Devices".

​

Simultaneous use of both Driven shield and Driven Shield+ is possible.
Refer to the “I/O Multiplexing and Considerations” section of the target device datasheet to examine the various touch pins that also support the TC or TCC outputs.

​

For the PIC32MZDA device, refer to Procedure To Enable Driven Shield.

Choosing the Driven Shield Option

  1. Select the Enable Dedicated Driven Shield checkbox
  2. Choose from the available TC/TCC to set the Timer Instance.
  3. Choose the Shield pin.
  4. Click Apply to update the Project Configuration. Allow the use of the TC/TCC as prompted.
DrivenShield.png

Choosing the Driven Shield+ Option

  1. Select the Enable Driven Shield Plus checkbox
  2. Choose from the available TC /TCC to set the Timer Instance.
  3. Click Apply to update the Project Configuration. Allow the use of the TC/TCC as prompted.
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In Step 2 above, not all pins support Timer Output in this QT7 example, see “I/O Multiplexing and Considerations” in the SAMD21 datasheet.

DrivenShieldP.png

When applied, the Project Graph should now contain the relevant timers for Driven Shield/Driven Shield+ in addition to the RTC.

In this example, Data Visualizer was also enabled.

DataVisualizer.png

7

Generate Code

Generate the Example Code to create the source code by going to MHC > Generate Code

GenerateCode.png

8

Enable Touch

Enable touch in the main application by adding touch_process(); within the main loop

MainLoop.png

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