Generate Mutual Cap Boost Mode Project

Mutual Capacitance Button

Create a User Board project for Mutualcap technology from Sensors > Button > Technology > Mutualcap from within the QTouch^® Configurator. (Refer to the "Generate a QTouch Configurator Project" page for more details.)

Sensor Layout View

Enabling Boost Mode

After configuring the sensors and pins, to enable Boost Mode, select the Boost Mode checkbox.

Pin Selection View

The mutual capacitance sensors are grouped down as per the Y-lines. If the total number of sensors for a given Y line is more than four, multiple groups are formed with four X-lines for each group. The group information can be found in touch.h file as illustrated below.

For a given Y line, if the number of sensors is less than four or if the number of sensors is not a multiple of four, virtual sensors named X_NONE are added to the group in that Y-line.

In the above example configuration, Y0 will not have X_NONE and the Y2 group will have two X_NONE as shown below.

Node Mapping Information

If the number of sensors is not a multiple of four or if each Y line does not have a multiple of four sensors, then the total number of nodes and buttons does not match. Even if everything is multiple of four, the buttons may not be sequentially assigned for a given Y line. So, to map the node to an individual button, an array is created in the touch.c file. The array touch_key_node_mapping_4p in the touch.c file displays the button’s position in the group created.

Data Streamer

The Datastreamer displays only the available buttons in the Sensors tab and not the X_NONEs.