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2. These can also be modified in the touch_config.h, after defining the _QMATRIX_ in the
project space.
3. In case XMEGA device is used for QMatrix the symbol __ATXMEGA_ has to be included
in the Project space along with the symbols mentioned above.
Step 4:
Filling Arrays in the main.c file
According to the pin availability for the touch sensing, initialize the arrays in the main.c file as
below:
x_line_info_t x_line_info[NUM_X_LINES]= {
FILL_OUT_X_LINE_INFO( 1,0u ),
FILL_OUT_X_LINE_INFO( 2,2u ),
FILL_OUT_X_LINE_INFO( 1,7u ),
};
y_line_info_t ya_line_info[NUM_Y_LINES]= {
FILL_OUT_YA_LINE_INFO(
FILL_OUT_YA_LINE_INFO(
0u ),
5u ),
};
y_line_info_t yb_line_info[NUM_Y_LINES]= {
FILL_OUT_YB_LINE_INFO(
FILL_OUT_YB_LINE_INFO(
0u ),
5u ),
};
Note:
1. This part of the snippet can be taken from the output of the Pin configurator tool from
QTouch Studio.
Step 5:
Usage of libraries
Now, you can use the touch API’s to create, initialize and perform touch sensing. Please refer to
the sample applications in section 5.6.11.3 for reference. These sample applications illustrate the
usage of the API’s and the sequence of operation
5.6.10.3.1.2 Resources used by QMatrix acquisition method libraries
The following additional resources are used by the QMatrix acquisition method libraries.
?
?
?
?
One Analog Comparator
One internal Timer ( Usually Timer1 depending on the availability on particular
microcontroller)
One ADC Multiplexer( The critical section of the touch sensing library disables the use of
ADC as conversion unit and enables the same ADC as a multiplexer, but the user can
use the ADC for conversion in rest of his application code )
The ADCMUX is used by the library during the touch sensing acquisition, however it is
restored with the value from host application before exiting the qt_measure_sensors().
Such that the ADC is available to the host application for conversion.
In case of XMega devices, the resources are used internal to the library and hence cannot be
used by the host application
61
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