PSoC™ 4 MCU CAPSENSE™ MSC Guard Sensor

Disclaimer: This is a community code example (CCE) released for the benefit of the community users. These projects have only been tested for the listed BSPs, tools versions, and toolchains documented in this readme. They are intended to demonstrate how a solution / concept / use-case can be achieved on a particular device. For official code examples, please click here.

This code example features the CAPSENSE™ guard sensor in PSoC™ 4 devices with Multi sense converter (MSC). The on-board LED will glow when touch is detected on trackpad but when the guard sensor is triggered due to liquid stream present on guard sensor surface, the on-board LED will stop glowing. The code example also demonstrates monitoring CAPSENSE™ data using the CAPSENSE™ Tuner GUI tool. This project uses the CAPSENSE™ Middleware Library.

Requirements

ModusToolbox™ software v3.0

Note: This code example version requires ModusToolbox™ software version 3.0 and may not be compatible with other versions.
Board support package (BSP) minimum required version: 2.0.0
Programming language: C
Associated parts: PSoC™ 4100S Max

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® embedded compiler v9.3.1 (GCC_ARM) - Default value of TOOLCHAIN

Supported kits (make variable 'TARGET')

PSoC™ 4100S Max (CY8CKIT-041S-MAX) - Default value of TARGET

Hardware setup

The "PROXIMITY" sensor on the CY8CKIT-041S-MAX CAPACITIVE SENSING EXPANSION BOARD is used as guard sensor and driven shield is used in this code example. Soldering re-work is required on the CY8CKIT-041S-MAX CAPACITIVE SENSING EXPANSION BOARD as shown in Figure 1. This ensures HATCH_PATTERN1 AND HATCH_PATTERN2 are driven by shield signal. Resistor R8 needs to be populated for SHIELD0 connection and resistor R10 for SHIELD1 connection. Resistor R7, which connects HATCH_PATTERN1 AND HATCH_PATTERN2 (the hatches driven by SHIELD0 and SHIELD1 respectively), is left as it is.

Figure 1. Kit re-work done on the CY8CKIT-041S-MAX CAPACITIVE SENSING EXPANSION BOARD

See the Kit user guide to ensure that the board is configured correctly to VDDA at 5V (J10 should be at position 1 and 2). If you are using the code example at a VDDA voltage other than 5 V, ensure to set up the device power voltages correctly for the proper operation of the device power domains. See Steps to setup the VDDA supply voltage in device configurator for more details.

Software setup

This example requires no additional software or tools.

Using the code example

Create the project and open it using one of the following:

In Eclipse IDE for ModusToolbox™ software

Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox Application). This launches the Project Creator tool.
Pick a kit supported by the code example from the list shown in the Project Creator - Choose Board Support Package (BSP) dialog.

When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the Quick Panel.

You can also just start the application creation process again and select a different kit.

If you want to use the application for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.
In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
(Optional) Change the suggested New Application Name.
The Application(s) Root Path defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the Application(s) Root Path value. Applications that share libraries should be in the same root path.
Click Create to complete the application creation process.

For more details, see the Eclipse IDE for ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/ide_{version}/docs/mt_ide_user_guide.pdf).

In command-line interface (CLI)

ModusToolbox™ software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The CLI tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the {ModusToolbox™ software install directory}/tools_{version}/project-creator/ directory.

Use a CLI terminal to invoke the "project-creator-cli" tool. On Windows, use the command line "modus-shell" program provided in the ModusToolbox™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ software tools. You can access it by typing modus-shell in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.

This tool has the following arguments:

Argument	Description	Required/optional
`--board-id`	Defined in the `<id>` field of the BSP manifest	Required
`--app-id`	Defined in the `<id>` field of the CE manifest	Required
`--target-dir`	Specify the directory in which the application is to be created if you prefer not to use the default current working directory	Optional
`--user-app-name`	Specify the name of the application if you prefer to have a name other than the example's default name	Optional

The following example will clone the "CAPSENSE™ MSC Guard Sensor" application with the desired name "MyCapsenseGuard" configured for the CY8CKIT-041S-MAX BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CKIT-041S-MAX --app-id cce-mtb-psoc4-msc-capsense-guard --user-app-name MyCapsenseGuard --target-dir "C:/mtb_projects"

Note: The project-creator-cli tool uses the git clone and make getlibs commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

In third-party IDEs

Use one of the following options:

Use the standalone Project Creator tool:
1. Launch Project Creator from the Windows Start menu or from {ModusToolbox™ software install directory}/tools_{version}/project-creator/project-creator.exe.
2. In the initial Choose Board Support Package screen, select the BSP, and click Next.
3. In the Select Application screen, select the appropriate IDE from the Target IDE drop-down menu.
4. Click Create and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.

Use command-line interface (CLI):
1. Follow the instructions from the In command-line interface (CLI) section to create the application, and then import the libraries using the make getlibs command.
2. Export the application to a supported IDE using the make <ide> command.
3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.

For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

Connect the FFC cable between J9 on PSoC™ 4100S Max pioneer board and J2 on a capacitive sensing expansion board. Power the device by plugging a USB 2.0 Type A to Micro-B cable on J8 (USB Micro-B connector). The connection are shown in Figure 2.

Figure 2. Connecting the CY8CKIT-041S-MAX kit with capacitive sensing expansion board to a PC
Program the board using one of the following:
Using Eclipse IDE for ModusToolbox™ software
1. Select the application project in the Project Explorer.
2. In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4).
Using CLI

From the terminal, execute the make program command to build and program the application using the default toolchain to the default target. The default toolchain and target are specified in the application's Makefile but you can override those values manually:
```
make program TARGET=<BSP> TOOLCHAIN=<toolchain>
```
Example:
```
make program TARGET=CY8CKIT-041S-MAX TOOLCHAIN=GCC_ARM
```
After programming, the application starts automatically.
To test the application, slide your finger over the CAPSENSE™ touchpad and notice that the user LED turns ON when touched and turns OFF when the finger is lifted.
In case there is stream of liquid present on the Capacitive sensing expansion board such that the guard sensor is shorted to GND (HATCH_PATTERN3), the guard sensor will be triggered and the on-board LED will stop glowing. The LED will remain off until guard senor is active i.e. liquid stream is present on top of the guard sensor.
You can also monitor the CAPSENSE™ data using the CAPSENSE™ Tuner application as follows:

Monitor Data Using CAPSENSE™ Tuner
1. Open CAPSENSE™ Tuner from the IDE Quick Panel.
  
  You can also run the CAPSENSE™ Tuner application standalone from {ModusToolbox install directory}/ModusToolbox/tools_{version}/capsense-configurator/capsense-tuner. In this case, after opening the application, select File > Open and open the design.cycapsense file for the respective kit, which is present in the TARGET_<BSP-NAME>/{version}/COMPONENT_BSP_DESIGN_MODUS or COMPONENT_CUSTOM_DESIGN_MODUS folder.
2. Ensure the kit is in KitProg3 mode. See Firmware-loader to learn on how to update the firmware and switch to KitProg3 mode.
3. In the Tuner application, click Tuner Communication Setup or select Tools > Tuner Communication Setup. In the window that appears, select the I2C checkbox under KitProg3 and configure as follows:
```
 I2C Address: 8
 Sub-address: 2-Bytes
 Speed (kHz): 1000
```
4. Click Connect or select Communication > Connect.
5. Click Start or select Communication > Start.
Under the Widget View tab, you can see the prximity widget highlighted in blue color when active. You can also view the sensor data in the Graph View tab.

The CAPSENSE™ Tuner can also be used for CAPSENSE™ parameter tuning, and measuring signal-to-noise ratio (SNR). See the ModusToolbox™ CAPSENSE™ Tuner Guide (Help > View Help) and AN85951 – PSoC 4 and PSoC 6 MCU CAPSENSE™ Design Guide for more details on selecting the tuning parameters.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ software user guide.

Design and implementation

The design has a ratiometric self-capacitance (CSD-RM) based, 26-element (10+16) CAPSENSE™ touchpad and one ratiometric self-capacitance (CSD-RM) based CAPSENSE™ guard sensor. Driven shield is configured and the hatches (HATCH_PATTERN1 and HATCH_PATTERN2) present around the guard sensor and touchpad are driven by this signal.

The project uses the CAPSENSE™ middleware (see ModusToolbox™ user guide for more details on selecting a middleware). See AN85951 – PSoC™ 4 and PSoC™ 6 MCU CAPSENSE™ design guide for more details on CAPSENSE™ features and usage.

The ModusToolbox™ software provides a GUI-based tuner application for debugging and tuning the CAPSENSE™ system. The CAPSENSE™ tuner application works with EZI2C and UART communication interfaces. This project has an SCB block configured in EZI2C mode to establish communication with the on-board KitProg, which in turn enables reading the CAPSENSE™ raw data by the CAPSENSE™ tuner. The proximity sensor may be tuned using CAPSENSE™ tuner. Once tuned, the new parameters may be applied to project. See ModusToolbox™ CAPSENSE™ Tuner Guide for more details.

Slide your finger over the CAPSENSE™ touchpad and notice that the user LED turns ON when touched and turns OFF when the finger is lifted. If guard sensor is active due to stream of liquid present on top of it, the LED will stop glowing.

Steps to setup the VDDA supply voltage in device configurator

Open Device configurator from the Quick panel.
Go to the System tab. Select the Power resource, and set the set the VDDA value under Operating conditions as shown in Figure 3.

Figure 3. Setting the VDDA supply in system tab of device configurator

Note: PSoC™ 4100S Max pioneer kit has two onboard regulators 3.3V and 5V. To use 3.3V, place the jumper J10 at positions 2 and 3. See the Kit user guide for more details.

Resources and settings

Figure 4: EZI2C Settings

Table 1. Application resources

Resource	Alias/object	Purpose
SCB (I2C) (PDL)	CYBSP_EZI2C	EZI2C slave driver to communicate with the CAPSENSE™ tuner
CAPSENSE™	CYBSP_MSC0, CYBSP_MSC1	CAPSENSE™ driver to interact with CAPSENSE™ hardware and interface CAPSENSE™ sensors
Digital Pins	CYBSP_USER_LED	To visually indicate the presence of a hand on top of the CAPSENSE™ trackpad

Table 2. Pins used for CAPSENSE™ sensors and LEDs

Development kit	Guard sensor	Driven shield	LED	Touchpad
CY8CKIT-041S-MAX	P6[5]	P11[3] P0[2]	P7[3]	P0[0], P7[7], P7[6], P5[7] P5[6], P4[7], P4[6], P4[5] P4[4], P11[4], P9[0], P9[1] P9[2], P9[3], P5[0], P5[3] P5[4], P5[5], P3[0], P3[1] P3[4], P3[5], P3[6], P3[7] P11[0], P11[1]

Related resources

Resources	Links
Application notes	AN79953 – Getting started with PSoC™ 4 AN85951 – PSoC™ 4 and PSoC™ 6 MCU CAPSENSE™ design guide
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	PSoC™ 4100S Max pioneer kit guide
Development kits	Visit PSoC™ and FMx MCU Board & Kit Finder to find a list of various PSoC™ evaluation boards.
Libraries on GitHub	mtb-pdl-cat2 – PSoC™ 4 peripheral driver library (PDL) mtb-hal-cat2 – Hardware abstraction layer (HAL) library
Middleware on GitHub	capsense – CAPSENSE™ library and documents psoc4-middleware – Links to all PSoC™ 4 MCU middleware
Tools	Eclipse IDE for ModusToolbox™ software – ModusToolbox™ software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi and Bluetooth® connectivity devices.

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

Document history

Document title: CCE236299 - PSoC™ 4 MCU: CAPSENSE™ MSC Guard Sensor

Version	Description of change
1.0.0	New community code example

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