touchscreen control class, based on SPI_TFT More...

#include <touch_tft.h>

Public Member Functions
	touch_tft (PinName xp, PinName xm, PinName yp, PinName ym, PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset, const char *name="TFT")
	create a TFT with touch object connected to the pins:
void	calibrate (void)
	calibrate the touch display
point	get_touch (void)
	read x and y analog samples
point	to_pixel (point a_point)
	calculate coord on screen
bool	is_touched (point a)
	test if screen is touched
virtual int	width ()
	Get the width of the screen in pixel.
virtual int	height ()
	Get the height of the screen in pixel.
virtual void	pixel (int x, int y, int colour)
	Draw a pixel at x,y with color.
void	circle (int x, int y, int r, int colour)
	draw a circle
void	fillcircle (int x, int y, int r, int colour)
	draw a filled circle
void	line (int x0, int y0, int x1, int y1, int colour)
	draw a 1 pixel line
void	rect (int x0, int y0, int x1, int y1, int colour)
	draw a rect
void	fillrect (int x0, int y0, int x1, int y1, int colour)
	draw a filled rect
void	locate (int x, int y)
	setup cursor position
virtual void	cls (void)
	Fill the screen with _backgroun color.
int	columns (void)
	calculate the max number of char in a line
int	rows (void)
	calculate the max number of columns
int	_putc (int value)
	put a char on the screen
virtual void	character (int x, int y, int c)
	draw a character on given position out of the active font to the TFT
void	Bitmap (unsigned int x, unsigned int y, unsigned int w, unsigned int h, unsigned char *bitmap)
	paint a bitmap on the TFT
int	BMP_16 (unsigned int x, unsigned int y, const char *Name_BMP)
	paint a 16 bit BMP from local filesytem on the TFT (slow)
void	set_font (unsigned char *f)
	select the font to use
void	set_orientation (unsigned int o)
	Set the orientation of the screen x,y: 0,0 is always top left.
virtual bool	claim (FILE *stream)
	redirect output from a stream (stoud, sterr) to display
Protected Member Functions
void	WindowMax (void)
	Set draw window region to whole screen.
void	hline (int x0, int x1, int y, int colour)
	draw a horizontal line
void	vline (int y0, int y1, int x, int colour)
	draw a vertical line
void	window (unsigned int x, unsigned int y, unsigned int w, unsigned int h)
	Set draw window region.
void	tft_reset ()
	Init the HX8347D controller.
void	wr_dat (int value)
	Write data to the LCD controller.
void	wr_cmd (int value)
	Write a command the LCD controller.
void	wr_dat_start ()
	Start data sequence to the LCD controller.
void	wr_dat_stop ()
	Stop of data writing to the LCD controller.
void	wr_dat_only (unsigned short dat)
	write data to the LCD controller
unsigned short	rd_dat (void)
	Read data from the LCD controller.
void	wr_reg (unsigned char reg, unsigned short val)
	Write a value to the to a LCD register.
unsigned short	rd_reg (unsigned char reg)
	Read a LCD register.

Detailed Description

touchscreen control class, based on SPI_TFT

Example:

 #include "mbed.h"
 #include "SPI_TFT.h"
 #include "Arial12x12.h"
 #include "Arial28x28.h"
 #include "touch_tft.h"
 // the TFT is connected to SPI pin 5-7
 // the touch is connected to 19,20,16,17

 touch_tft tt(p19,p20,p16,p17,p5, p6, p7, p8, p15,"TFT"); // x+,x-,y+,y-,mosi, miso, sclk, cs, reset

 int main() {
 point p;

  tt.claim(stdout);        // send stdout to the TFT display
  tt.background(Black);    // set background to black
  tt.foreground(White);    // set chars to white
  tt.cls();                // clear the screen
  tt.set_font((unsigned char*) Arial12x12);  // select the font
  tt.set_orientation(1);

  tt.calibrate();          // calibrate the touch
 while (1) {
       p = tt.get_touch();   // read analog pos.
       if (tt.is_touched(p)) {  // test if touched
           p = tt.to_pixel(p);             // convert to pixel pos
           tt.fillcircle(p.x,p.y,3,Blue);  // print a blue dot on the screen
     }
 }

Definition at line 61 of file touch_tft.h.

Constructor & Destructor Documentation

touch_tft	(	PinName	xp,
		PinName	xm,
		PinName	yp,
		PinName	ym,
		PinName	mosi,
		PinName	miso,
		PinName	sclk,
		PinName	cs,
		PinName	reset,
		const char *	name = `"TFT"`
	)

create a TFT with touch object connected to the pins:

Parameters:

pin	xp resistiv touch x+
pin	xm resistiv touch x-
pin	yp resistiv touch y+
pin	ym resistiv touch y-
mosi,miso,sclk	SPI connection to TFT
cs	pin connected to CS of display
reset	pin connected to RESET of display based on my SPI_TFT lib

Definition at line 21 of file touch_tft.cpp.

Member Function Documentation

int _putc ( int value ) [inherited]

put a char on the screen

Parameters:

value char to print

Returns:: printed char

Definition at line 570 of file SPI_TFT.cpp.

void Bitmap	(	unsigned int	x,
		unsigned int	y,
		unsigned int	w,
		unsigned int	h,
		unsigned char *	bitmap
	)		`[inherited]`

paint a bitmap on the TFT

Parameters:

x,y	: upper left corner
w	width of bitmap
h	high of bitmap
*bitmap	pointer to the bitmap data

bitmap format: 16 bit R5 G6 B5

use Gimp to create / load , save as BMP, option 16 bit R5 G6 B5 use winhex to load this file and mark data stating at offset 0x46 to end use edit -> copy block -> C Source to export C array paste this array into your program

define the array as static const unsigned char to put it into flash memory cast the pointer to (unsigned char *) : tft.Bitmap(10,40,309,50,(unsigned char *)scala);

Definition at line 643 of file SPI_TFT.cpp.

int BMP_16	(	unsigned int	x,
		unsigned int	y,
		const char *	Name_BMP
	)		`[inherited]`

paint a 16 bit BMP from local filesytem on the TFT (slow)

Parameters:

x,y	: upper left corner
*Name_BMP	name of the BMP file

Returns:: 1 if bmp file was found and painted; -1 if bmp file was found not found; -2 if bmp file is not 16bit; -3 if bmp file is to big for screen; -4 if buffer malloc go wrong

bitmap format: 16 bit R5 G6 B5

use Gimp to create / load , save as BMP, option 16 bit R5 G6 B5 copy to internal file system

Definition at line 671 of file SPI_TFT.cpp.

void calibrate ( void )

calibrate the touch display

User is asked to touch on two points on the screen

Definition at line 110 of file touch_tft.cpp.

void character	(	int	x,
		int	y,
		int	c
	)		`[virtual, inherited]`

draw a character on given position out of the active font to the TFT

Parameters:

x	x-position of char (top left)
y	y-position
c	char to print

Definition at line 586 of file SPI_TFT.cpp.

void circle	(	int	x,
		int	y,
		int	r,
		int	colour
	)		`[inherited]`

draw a circle

Parameters:

x0,y0	center
r	radius
color	16 bit color *

Definition at line 288 of file SPI_TFT.cpp.

bool claim ( FILE * stream ) [virtual, inherited]

redirect output from a stream (stoud, sterr) to display

Parameters:

stream stream that shall be redirected to the TextDisplay

Definition at line 65 of file TextDisplay.cpp.

void cls ( void ) [virtual, inherited]

Fill the screen with _backgroun color.

Definition at line 275 of file SPI_TFT.cpp.

int columns ( void ) [inherited]

calculate the max number of char in a line

Returns:: max columns depends on actual font size

Definition at line 558 of file SPI_TFT.cpp.

void fillcircle	(	int	x,
		int	y,
		int	r,
		int	colour
	)		`[inherited]`

draw a filled circle

Parameters:

x0,y0	center
r	radius
color	16 bit color *

use circle with different radius, can miss some pixel

Definition at line 395 of file SPI_TFT.cpp.

void fillrect	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	colour
	)		`[inherited]`

draw a filled rect

Parameters:

x0,y0	top left corner
x1,y1	down right corner
color	16 bit color

Definition at line 531 of file SPI_TFT.cpp.

point get_touch ( void )

read x and y analog samples

Returns:: point(x,y)

Definition at line 30 of file touch_tft.cpp.

int height ( ) [virtual, inherited]

Get the height of the screen in pixel.

Returns:: height of screen in pixel

Definition at line 40 of file SPI_TFT.cpp.

void hline	(	int	x0,
		int	x1,
		int	y,
		int	colour
	)		`[protected, inherited]`

draw a horizontal line

Parameters:

x0	horizontal start
x1	horizontal stop
y	vertical position
color	16 bit color

Definition at line 403 of file SPI_TFT.cpp.

bool is_touched ( point a )

test if screen is touched

Parameters:

point analog x,y

Returns:: true is touched

Definition at line 225 of file touch_tft.cpp.

void line	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	colour
	)		`[inherited]`

draw a 1 pixel line

Parameters:

x0,y0	start point
x1,y1	stop point
color	16 bit color

Definition at line 439 of file SPI_TFT.cpp.

void locate	(	int	x,
		int	y
	)		`[inherited]`

setup cursor position

Parameters:

x	x-position (top left)
y	y-position

Definition at line 551 of file SPI_TFT.cpp.

void pixel	(	int	x,
		int	y,
		int	colour
	)		`[virtual, inherited]`

Draw a pixel at x,y with color.

Parameters:

x	horizontal position
y	vertical position
color	16 bit pixel color

Definition at line 241 of file SPI_TFT.cpp.

unsigned short rd_dat ( void ) [protected, inherited]

Read data from the LCD controller.

Returns:: data from LCD controller

Definition at line 110 of file SPI_TFT.cpp.

unsigned short rd_reg ( unsigned char reg ) [protected, inherited]

Read a LCD register.

Parameters:

reg	register to be read

Returns:: value of the register

Definition at line 133 of file SPI_TFT.cpp.

void rect	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	colour
	)		`[inherited]`

draw a rect

Parameters:

x0,y0	top left corner
x1,y1	down right corner
color	16 bit color *

Definition at line 512 of file SPI_TFT.cpp.

int rows ( void ) [inherited]

calculate the max number of columns

Returns:: max column depends on actual font size

Definition at line 564 of file SPI_TFT.cpp.

void set_font ( unsigned char * f ) [inherited]

select the font to use

Parameters:

f	pointer to font array

font array can created with GLCD Font Creator from http://www.mikroe.com you have to add 4 parameter at the beginning of the font array to use:

the number of byte / char
the vertial size in pixel
the horizontal size in pixel
the number of byte per vertical line you also have to change the array to char[]

Definition at line 637 of file SPI_TFT.cpp.

void set_orientation ( unsigned int o ) [inherited]

Set the orientation of the screen x,y: 0,0 is always top left.

Parameters:

o	direction to use the screen (0-3) 90� Steps

Definition at line 47 of file SPI_TFT.cpp.

void tft_reset ( ) [protected, inherited]

Init the HX8347D controller.

Definition at line 141 of file SPI_TFT.cpp.

point to_pixel ( point a_point )

calculate coord on screen

Parameters:

a_point point(analog x, analog y)

Returns:: point(pixel x, pixel y)

Definition at line 215 of file touch_tft.cpp.

void vline	(	int	y0,
		int	y1,
		int	x,
		int	colour
	)		`[protected, inherited]`

draw a vertical line

Parameters:

x	horizontal position
y0	vertical start
y1	vertical stop
color	16 bit color

Definition at line 421 of file SPI_TFT.cpp.

int width ( ) [virtual, inherited]

Get the width of the screen in pixel.

Parameters:

@returns width of screen in pixel

Definition at line 34 of file SPI_TFT.cpp.

void window	(	unsigned int	x,
		unsigned int	y,
		unsigned int	w,
		unsigned int	h
	)		`[protected, inherited]`

Set draw window region.

Parameters:

x	horizontal position
y	vertical position
w	window width in pixel
h	window height in pixels

Definition at line 257 of file SPI_TFT.cpp.

void WindowMax ( void ) [protected, inherited]

Set draw window region to whole screen.

Definition at line 270 of file SPI_TFT.cpp.

void wr_cmd ( int value ) [protected, inherited]

Write a command the LCD controller.

Parameters:

cmd,: command to be written

Definition at line 68 of file SPI_TFT.cpp.

void wr_dat ( int value ) [protected, inherited]

Write data to the LCD controller.

Parameters:

dat	data written to LCD controller

Definition at line 77 of file SPI_TFT.cpp.

void wr_dat_only ( unsigned short dat ) [protected, inherited]

write data to the LCD controller

Parameters:

data	to be written *

Definition at line 101 of file SPI_TFT.cpp.

void wr_dat_start ( void ) [protected, inherited]

Start data sequence to the LCD controller.

Definition at line 88 of file SPI_TFT.cpp.

void wr_dat_stop ( void ) [protected, inherited]

Stop of data writing to the LCD controller.

Definition at line 95 of file SPI_TFT.cpp.

void wr_reg	(	unsigned char	reg,
		unsigned short	val
	)		`[protected, inherited]`

Write a value to the to a LCD register.

Parameters:

reg	register to be written
val	data to be written

Definition at line 125 of file SPI_TFT.cpp.

Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	31 Jan 2012
Imports:	78
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

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