touch_interface.c File Reference

Touch screen interface functions for the mxt143e Xplained module.

Copyright (c) 2012-2018 Microchip Technology Inc. and its subsidiaries.

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

Macros
#define	MAXTOUCH_TWI_ADDRESS   0x4a
	Address of the mXT143E on TWI bus. More...

Functions
void	touch_interface_init (void)
	Initializes the touchscreen, ready to detect user input. More...
bool	touch_interface_read (struct win_pointer_event *win_touch_event)
	Convert touch events from the touchscreen into window pointer events. More...

Variables
static struct mxt_device	mxt_dev_inst
	Software maXTouch device instance. More...

#define MAXTOUCH_TWI_ADDRESS   0x4a

Address of the mXT143E on TWI bus.

Referenced by touch_interface_init().

void touch_interface_init

(

void

)

Initializes the touchscreen, ready to detect user input.

Performs and initialization and calibration of the touchscreen, so that it is ready for use.

References Assert, delay_ms, MAXTOUCH_TWI_ADDRESS, MXT143E_XPLAINED_CHG, mxt_dev_inst, MXT_GEN_ACQUISITIONCONFIG_T8, MXT_GEN_COMMANDPROCESSOR_CALIBRATE, MXT_GEN_COMMANDPROCESSOR_RESET, MXT_GEN_COMMANDPROCESSOR_T6, MXT_GEN_POWERCONFIG_T7, mxt_get_object_address(), mxt_init_device(), MXT_PROCG_TOUCHSUPPRESSION_T48, MXT_RESET_TIME, MXT_TOUCH_MULTITOUCHSCREEN_T9, MXT_TWI_SPEED, mxt_write_config_object(), mxt_write_config_reg(), twi_options_t::speed, status, STATUS_OK, TWI_INTERFACE, and twi_master_setup().

Referenced by main().

bool touch_interface_read

(

struct win_pointer_event *

win_touch_event

)

Convert touch events from the touchscreen into window pointer events.

Reads touch events in from the touchscreen and converts them into a Window Manager pointer event, for enqueuing into the window event queue.

Returns

Boolean true if a touch event was read, false if no touch event or a corrupt touch event was received

References win_pointer_event::buttons, gfx_get_height(), gfx_get_width(), win_pointer_event::is_relative, mxt_dev_inst, mxt_is_message_pending(), MXT_MOVE_EVENT, MXT_PRESS_EVENT, mxt_read_touch_event(), MXT_RELEASE_EVENT, win_pointer_event::pos, mxt_touch_event::status, STATUS_OK, win_pointer_event::type, WIN_POINTER_MOVE, WIN_POINTER_PRESS, WIN_POINTER_RELEASE, WIN_TOUCH_BUTTON, mxt_touch_event::x, win_point::x, mxt_touch_event::y, and win_point::y.

Referenced by main().

struct mxt_device mxt_dev_inst

static

Software maXTouch device instance.

Referenced by touch_interface_init(), and touch_interface_read().