touch.c File Reference

Touch button driver.

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

#include <compiler.h>
#include <tc.h>
#include <touch_api.h>
#include "touch.h"

Macros
#define	TOUCH_GET_SENSOR_STATE(SENSOR_NUMBER)
	Convenience macro for getting state of touch sensor. More...
#define	TOUCH_TC   TCD0
	Timer/counter for timing touch measurements. More...
#define	TOUCH_TC_PERIOD_MS   25
	Period in milliseconds between each touch measurement. More...

Functions
static void	touch_config_sensor (void)
	Configure the touch sensor. More...
void	touch_init (void)
	Configure QTouch library and measurement setup. More...
static void	touch_init_timer_isr (void)
	Configure timer interrupts for touch measurements. More...
bool	touch_key_is_pressed (void)
	Check if user is pressing the touch key. More...
static void	touch_set_parameters (void)
	Pass default parameters to QTouch library. More...
static void	touch_timer_period_handler (void)
	Callback function for timer period interrupt. More...

Variables
static volatile uint16_t	current_time_ms_touch = 0
	Current time, set by timer period callback. More...
qt_touch_lib_measure_data_t *const	pqt_measure_data = &qt_measure_data
	QTouch measurement data pointer for debug purposes. More...
qt_touch_lib_config_data_t	qt_config_data
	QTouch configuration struct. More...
qt_touch_lib_measure_data_t	qt_measure_data
	QTouch measurement data struct. 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 period callback to trigger touch measurements. More...

#define TOUCH_GET_SENSOR_STATE

(

SENSOR_NUMBER

)

Value:

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

Convenience macro for getting state of touch sensor.

Referenced by touch_key_is_pressed().

#define TOUCH_TC   TCD0

Timer/counter for timing touch measurements.

Referenced by touch_init_timer_isr().

#define TOUCH_TC_PERIOD_MS   25

Period in milliseconds between each touch measurement.

Referenced by touch_init_timer_isr(), and touch_timer_period_handler().

static void touch_config_sensor ( void  )

static

Configure the touch sensor.

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

Referenced by touch_init().

void touch_init

(

void

)

Configure QTouch library and measurement setup.

References qt_filter_callback, qt_init_sensing, SNS_array, SNSK_array, touch_config_sensor(), touch_init_timer_isr(), and touch_set_parameters().

Referenced by main().

static void touch_init_timer_isr ( void  )

static

Configure timer interrupts for touch measurements.

References tc_enable(), tc_get_resolution(), TC_INT_LVL_LO, tc_set_overflow_interrupt_callback(), tc_set_overflow_interrupt_level(), tc_set_resolution(), tc_write_period(), TOUCH_TC, TOUCH_TC_PERIOD_MS, and touch_timer_period_handler().

Referenced by touch_init().

bool touch_key_is_pressed

(

void

)

Check if user is pressing the touch key.

Return values

true	if key is pressed.
false	if key is not pressed.

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

Referenced by keyboard_get_key_state(), and main().

static void touch_set_parameters ( void  )

static

Pass default parameters to QTouch library.

References 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().

static void touch_timer_period_handler ( void  )

static

Callback function for timer period interrupt.

References current_time_ms_touch, time_to_measure_touch, and TOUCH_TC_PERIOD_MS.

Referenced by touch_init_timer_isr().

volatile uint16_t current_time_ms_touch = 0

static

Current time, set by timer period callback.

Referenced by touch_key_is_pressed(), and touch_timer_period_handler().

qt_touch_lib_measure_data_t* const pqt_measure_data = &qt_measure_data

QTouch measurement data pointer for debug purposes.

qt_touch_lib_config_data_t qt_config_data

QTouch configuration struct.

qt_touch_lib_measure_data_t qt_measure_data

QTouch measurement data struct.

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 period callback to trigger touch measurements.

Referenced by touch_key_is_pressed(), and touch_timer_period_handler().