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/* filter for channel signals */
static uint16_t filter[QT_NUM_CHANNELS][4];
2. Add a filter function prototype to the main module:
/* example signal filtering function */
static void filter_data_mean_4( void );
3. When configuring the ATMEL QTouch library, set the callback function pointer:
/* set callback function */
qt_filter_callback = filter_data_mean_4;
4. Add the filter function:
void filter_data_mean_4( void )
{
uint8_t i;
/*
* Shift previously stored channel signal data.
* Store new channel signal data.
* Set library channel signal data = mean of last 4 values.
*/
for( i = 0u; i < QT_NUM_CHANNELS; i++ )
{
filter[i][0] = filter[i][1];
filter[i][1] = filter[i][2];
filter[i][2] = filter[i][3];
filter[i][3] = qt_measure_data.channel_signals[i];
qt_measure_data.channel_signals[i] = ( (
filter[i][0] +
filter[i][1] +
filter[i][2] +
filter[i][3] ) / 4u );
}
}
The signal values processed by the ATMEL QTouch Library are now the mean of the last four
actual signal values.
5.6.6.4
Allocating unused Port Pins for User Application
The GPIO pins within a port that are not used for QTouch or QMatrix acquisition methods can be
used for user application. The usage of pins for QTouch is based on the channels that are being
configured while enabling the sensors (keys/rotors/sliders).
The example below configuring 4 keys, a rotor and a slider shows how the pin configurability is
achieved by configuring the sensor channels. The code snippet configures a specific 10 channels
of a 16 channel library based on the GPIO port pins available for QTouch?.
Port Configuration:
#define SNSK1
#define SNS1
#define SNSK2
#define SNS2
C
D
A
B
Channel/Pin Configuration:
/* enable a key on channel 0 */
qt_enable_key( CHANNEL_0, AKS_GROUP_2, 10u, HYST_6_25 );
43
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