touch.c File Reference

QTouch Sensor interface.

Copyright (c) 2010-2018 Microchip Technology Inc. and its subsidiaries.

#include <asf.h>
#include "touch_api.h"

Macros
#define	GET_SENSOR_STATE(SENSOR_NUMBER)

Functions
bool	check_touch_key_pressed (void)
static void	config_sensor (void)
static void	init_timer_isr (void)
int16_t	qt_get_sensor_delta (uint8_t sensor)
	Get sensor delta values. More...
static void	qt_set_parameters (void)
	Passes default parameters from config file to touch library. More...
void	touch_init (void)
	Configures touch library and measurement setup. More...
static void	touch_timer_callback ()

Variables
static volatile uint16_t	current_time_ms_touch = 0
	Current time, set by timer ISR. More...
qt_touch_lib_measure_data_t *	pqt_measure_data = &qt_measure_data
	Output can be observed in the watch window using this pointer. More...
qt_touch_lib_config_data_t	qt_config_data
	This configuration data structure parameters if needs to be changed will be changed in the qt_set_parameters function. More...
qt_touch_lib_measure_data_t	qt_measure_data
	Touch output - measurement data. More...
uint16_t	qt_measurement_period_msec = 25
	Timer period in msec. More...
TOUCH_DATA_T	SNS_array [2][2]
TOUCH_DATA_T	SNSK_array [2][2]
static volatile bool	time_to_measure_touch = false
	Flag set by timer ISR when it's time to measure touch. More...

#define GET_SENSOR_STATE

(

SENSOR_NUMBER

)

Value:

qt_measure_data.qt_touch_status. \
    sensor_states[(SENSOR_NUMBER / 8)] & (1 << (SENSOR_NUMBER % 8))

Referenced by check_touch_key_pressed().

bool check_touch_key_pressed

(

void

)

References current_time_ms_touch, GET_SENSOR_STATE, qt_measure_sensors(), QTLIB_BURST_AGAIN, and time_to_measure_touch.

Referenced by keyboard_get_key_state().

static void config_sensor ( void  )

static

References CHANNEL_0, HYST_6_25, NO_AKS_GROUP, and qt_enable_key().

Referenced by touch_init().

static void init_timer_isr ( void  )

static

References qt_measurement_period_msec, TC_CCAEN, tc_enable(), tc_enable_cc_channels(), TC_INT_LVL_LO, tc_set_cca_interrupt_callback(), tc_set_cca_interrupt_level(), tc_write_clock_source(), tc_write_period(), and touch_timer_callback().

Referenced by touch_init().

int16_t qt_get_sensor_delta

(

uint8_t

sensor

)

Get sensor delta values.

static void qt_set_parameters ( void  )

static

Passes default parameters from config file to touch library.

References DEF_QT_DI, DEF_QT_DRIFT_HOLD_TIME, DEF_QT_MAX_ON_DURATION, DEF_QT_NEG_DRIFT_RATE, DEF_QT_POS_DRIFT_RATE, DEF_QT_POS_RECAL_DELAY, DEF_QT_RECAL_THRESHOLD, tag_qt_touch_lib_config_data_t::qt_di, tag_qt_touch_lib_config_data_t::qt_drift_hold_time, tag_qt_touch_lib_config_data_t::qt_max_on_duration, tag_qt_touch_lib_config_data_t::qt_neg_drift_rate, tag_qt_touch_lib_config_data_t::qt_pos_drift_rate, tag_qt_touch_lib_config_data_t::qt_pos_recal_delay, and tag_qt_touch_lib_config_data_t::qt_recal_threshold.

Referenced by touch_init().

void touch_init

(

void

)

Configures touch library and measurement setup.

Precondition

Interrupts must be enabled in order to trigger regular measurements The touch configuration requires a fixed CPU speed to work properly in this case we need 2 MHz.

References config_sensor(), init_timer_isr(), qt_filter_callback, qt_init_sensing, qt_set_parameters(), SNS_array, and SNSK_array.

Referenced by main().

static void touch_timer_callback ( )

static

References current_time_ms_touch, qt_measurement_period_msec, and time_to_measure_touch.

Referenced by init_timer_isr().

volatile uint16_t current_time_ms_touch = 0

static

Current time, set by timer ISR.

Referenced by check_touch_key_pressed(), and touch_timer_callback().

qt_touch_lib_measure_data_t* pqt_measure_data = &qt_measure_data

Output can be observed in the watch window using this pointer.

qt_touch_lib_config_data_t qt_config_data

This configuration data structure parameters if needs to be changed will be changed in the qt_set_parameters function.

qt_touch_lib_measure_data_t qt_measure_data

Touch output - measurement data.

uint16_t qt_measurement_period_msec = 25

Timer period in msec.

Referenced by init_timer_isr(), and touch_timer_callback().

TOUCH_DATA_T SNS_array[2][2]

Referenced by touch_init().

TOUCH_DATA_T SNSK_array[2][2]

Referenced by touch_init().

volatile bool time_to_measure_touch = false

static

Flag set by timer ISR when it's time to measure touch.

Referenced by check_touch_key_pressed(), and touch_timer_callback().