mXT143E Xplained paint demo application

#include <asf.h>
#include <stdio.h>

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

#define	MULTI_COLOR_INCREMENT 4
	Color increment/decrement amount when in multi-color mode; larger values will cause the colors to cycle faster. More...

#define	NUM_PALLET_COLORS (sizeof(pallet_colors) / sizeof(pallet_colors[0]))
	Number of colors in the pallet (computed automatically from number of entries in the pallet_colors[] array) More...

#define	PALLET_COLOR_WIDTH (gfx_get_width() / NUM_PALLET_COLORS)
	Width of each color entry in the pallet on the display. More...

#define	PALLET_HEIGHT 22
	Height of the pallet on the display. More...

Functions
static void	draw_paint_pallet (void)
	Draws the color pallet to the display. More...

static void	draw_pallet_labels (const bool clearing_display)
	Draws the special function pallet entry text labels. More...

static gfx_color_t	get_next_rainbow_color (void)
	Compute the next rainbow color for multi-color drawing mode. More...

int	main (void)
	Main application loop. More...

static void	mxt_handler (struct mxt_device *device)
	Handle maXTouch messages. More...

static void	mxt_init (struct mxt_device *device)
	Set maXTouch configuration. More...

static void	update_pallet_selection (void)
	Updates the color pallet to the display. More...

Variables
const gfx_color_t	pallet_colors []
	Color pallet for the application; add or remove colors here to update the pallet in the application. More...

uint8_t	selected_pallet_color = 0
	Pallet index of the currently selected color by the user. More...

#define MAXTOUCH_TWI_ADDRESS 0x4a

Address of the mXT143E on TWI bus.

Referenced by mxt_init().

#define MULTI_COLOR_INCREMENT 4

Color increment/decrement amount when in multi-color mode; larger values will cause the colors to cycle faster.

Referenced by get_next_rainbow_color().

#define NUM_PALLET_COLORS (sizeof(pallet_colors) / sizeof(pallet_colors[0]))

Number of colors in the pallet (computed automatically from number of entries in the pallet_colors[] array)

Referenced by draw_paint_pallet(), draw_pallet_labels(), and mxt_handler().

#define PALLET_COLOR_WIDTH (gfx_get_width() / NUM_PALLET_COLORS)

Width of each color entry in the pallet on the display.

Referenced by draw_paint_pallet(), draw_pallet_labels(), mxt_handler(), and update_pallet_selection().

#define PALLET_HEIGHT 22

Height of the pallet on the display.

Referenced by draw_paint_pallet(), draw_pallet_labels(), main(), mxt_handler(), and update_pallet_selection().

static void draw_paint_pallet ( void )

static

Draws the color pallet to the display.

This function draws the paint pallet to the display, including the special function entries (such as display clear) and the selection box.

References draw_pallet_labels(), GFX_COLOR_GRAY, gfx_draw_filled_rect, gfx_draw_horizontal_line, gfx_get_height(), gfx_get_width(), NUM_PALLET_COLORS, PALLET_COLOR_WIDTH, pallet_colors, PALLET_HEIGHT, and update_pallet_selection().

Referenced by main().

static void draw_pallet_labels ( const bool clearing_display )

static

Draws the special function pallet entry text labels.

This function draws the special function pallet entry text labels to the appropriate positions on the display.

Parameters

clearing_display True if the display is currently being cleared

References GFX_COLOR_RED, GFX_COLOR_TRANSPARENT, GFX_COLOR_WHITE, gfx_draw_string_aligned(), gfx_get_height(), NUM_PALLET_COLORS, PALLET_COLOR_WIDTH, PALLET_HEIGHT, sysfont, TEXT_ALIGN_LEFT, and TEXT_POS_CENTER.

Referenced by draw_paint_pallet(), and mxt_handler().

static gfx_color_t get_next_rainbow_color ( void )

static

Compute the next rainbow color for multi-color drawing mode.

This function handles the color mixing algorithm needed to produce a sequence of colors in the RGB spectrum. Each time it is called, the next color in the sequence is returned.

Returns: The next color in the rainbow sequence as a gfx_color_t.

References GFX_COLOR, and MULTI_COLOR_INCREMENT.

Referenced by mxt_handler().

int main ( void )

Main application loop.

This is the main application function, which runs all the initialization code, clears the display and enters a loop in which it continuously polls for new messages from the maXTouch device. If one or more messages are pending, the maXTouch message handler is invoked.

References board_init(), draw_paint_pallet(), GFX_COLOR_TRANSPARENT, GFX_COLOR_WHITE, gfx_draw_string_aligned(), gfx_get_height(), gfx_get_width(), gfx_init, mxt_handler(), mxt_init(), mxt_is_message_pending(), PALLET_HEIGHT, sysclk_init(), sysfont, TEXT_ALIGN_LEFT, and TEXT_POS_CENTER.

static void mxt_handler ( struct mxt_device * device )

static

Handle maXTouch messages.

This function handles the maXTouch messages, triggering the drawing of squares around new or moved touches, and removing the squares around released touches.

Parameters

device Pointer to mxt_device struct

References draw_pallet_labels(), get_next_rainbow_color(), GFX_COLOR_BLACK, gfx_draw_filled_circle, gfx_draw_filled_rect, gfx_get_height(), gfx_get_width(), gfx_set_clipping(), GFX_WHOLE, mxt_is_message_pending(), MXT_MOVE_EVENT, MXT_PRESS_EVENT, mxt_read_touch_event(), MXT_RELEASE_EVENT, NUM_PALLET_COLORS, PALLET_COLOR_WIDTH, pallet_colors, PALLET_HEIGHT, selected_pallet_color, mxt_touch_event::size, mxt_touch_event::status, STATUS_OK, update_pallet_selection(), mxt_touch_event::x, and mxt_touch_event::y.

Referenced by main().

static void mxt_init ( struct mxt_device * device )

static

Set maXTouch configuration.

This function writes a set of predefined, optimal maXTouch configuration data to the mXT143E Xplained.

Parameters

device Pointer to mxt_device struct

References Assert, delay_ms, MAXTOUCH_TWI_ADDRESS, 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_write_config_object(), mxt_write_config_reg(), twi_options_t::speed, status, STATUS_OK, twi_master_setup(), and UNUSED.

Referenced by main().

static void update_pallet_selection ( void )

static

Updates the color pallet to the display.

This function should be called whenever a new color is selected on the pallet. It will then move the selection box to the newly chosen color.

References GFX_COLOR_GRAY, gfx_draw_rect, gfx_get_height(), PALLET_COLOR_WIDTH, pallet_colors, PALLET_HEIGHT, and selected_pallet_color.

Referenced by draw_paint_pallet(), and mxt_handler().

const gfx_color_t pallet_colors[]

Initial value:

= {
    0,           
    GFX_COLOR_WHITE,
    GFX_COLOR_BLACK,
    GFX_COLOR_RED,
    GFX_COLOR_GREEN,
    GFX_COLOR_BLUE,
    GFX_COLOR_MAGENTA,
    GFX_COLOR_YELLOW,
    GFX_COLOR_CYAN,
    0,           
}

Color pallet for the application; add or remove colors here to update the pallet in the application.

Referenced by draw_paint_pallet(), mxt_handler(), and update_pallet_selection().

uint8_t selected_pallet_color = 0

Pallet index of the currently selected color by the user.

Referenced by mxt_handler(), and update_pallet_selection().

Microchip® Advanced Software Framework

Macros

Functions

Variables