Class for (quite)standard MIPI-DBI TypeB (parallel) and TypeC (spi) TFT display controller for Ilitek ILI9481, Renesas R61581, Raydium RM68042 to be copypasted and adapted for other controllers. More...

#include <TFT_MIPI.h>

Inherits TFT.

Public Member Functions
	TFT_MIPI (proto_t displayproto, PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char *name, unsigned int LCDSIZE_X=320, unsigned int LCDSIZE_Y=480)
	Create a PAR display interface.
	TFT_MIPI (proto_t displayproto, int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC, const char *name, unsigned int LCDSIZE_X=320, unsigned int LCDSIZE_Y=480)
	Create an SPI display interface.
virtual void	pixel (int x, int y, unsigned short color)
	Draw a pixel in the specified color.
virtual void	window (int x, int y, int w, int h)
	Set the window, which controls where items are written to the screen.
virtual unsigned short	pixelread (int x, int y)
	Read pixel color at location.
virtual void	window4read (int x, int y, int w, int h)
	Set the window from which gram is read from.
virtual void	window_pushpixel (unsigned short color)
	Push a single pixel into the window and increment position.
virtual void	window_pushpixel (unsigned short color, unsigned int count)
	Push some pixels of the same color into the window and increment position.
virtual void	window_pushpixelbuf (unsigned short *color, unsigned int lenght)
	Push array of pixel colors into the window and increment position.
virtual void	copy_to_lcd ()
	Framebuffer is not used for TFT.
void	invert (unsigned char o)
	display inverted colors
virtual void	cls ()
	clear the entire screen The inherited one sets windomax then fill with background color We override it to speedup
virtual void	set_orientation (int o)
	Set the orientation of the screen x,y: 0,0 is always top left.
virtual void	BusEnable (bool enable)
	Set ChipSelect high or low.
void	FastWindow (bool enable)
	Enable fast window (default disabled) used to speedup functions that plots single pixels, like circle, oblique lines or just sparse pixels.
void	setscrollarea (int startY, int areasize)
	Set scroll area boundaries scroll is done in hw but only on the native vertical axis TFTs are mainly native protrait view, so horizontal scroll if rotated in landscape view.
void	scroll (int lines)
	Scroll up(or left) the scrollarea.
void	scrollreset ()
	Reset the scrollarea and display un-scrolled screen.
int	sizeX ()
	get display X size in pixels (native, orientation independent)
int	sizeY ()
	get display Y size in pixels (native, orientation independent)
virtual void	WindowMax (void)
	Set window to max possible size May be overridden in a derived class.
virtual void	circle (int x, int y, int r, unsigned short color)
	draw a circle
virtual void	fillcircle (int x, int y, int r, unsigned short color)
	draw a filled circle
virtual void	line (int x0, int y0, int x1, int y1, unsigned short color)
	draw a 1 pixel line
void	hline (int x0, int x1, int y, unsigned short color)
	draw a horizontal line
void	vline (int y0, int y1, int x, unsigned short color)
	draw a vertical line
virtual void	rect (int x0, int y0, int x1, int y1, unsigned short color)
	draw a rect
virtual void	fillrect (int x0, int y0, int x1, int y1, unsigned short color)
	draw a filled rect
virtual void	locate (int x, int y)
	setup cursor position for text
virtual 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 (int x, int y, int w, int h, unsigned char *bitmap)
	paint a bitmap on the TFT
void	Bitmap_BW (Bitmap_s bm, int x, int y)
	paint monochrome bitmap to screen
int	BMP_16 (int x, int y, const char *Name_BMP)
	paint a 16 bit BMP from filesytem on the TFT (slow)
void	set_font (unsigned char *f, unsigned char firstascii=32, unsigned char lastascii=127, bool proportional=true)
	select the font to use
void	set_font_zoom (unsigned char x_mul, unsigned char y_mul)
	Zoom fount.
virtual int	columns ()
	Get the number of columns based on the currently active font.
virtual int	rows ()
	Get the number of rows based on the currently active font.
int	width ()
	get the current oriented screen width in pixels
int	height ()
	get the current oriented screen height in pixels
void	set_width (int width)
	set the current oriented screen width in pixels
void	set_height (int height)
	set the current oriented screen height in pixels
void	set_auto_up (bool up)
	setup auto update of screen
bool	get_auto_up (void)
	get status of the auto update function
virtual bool	claim (FILE *stream)
	redirect output from a stream (stoud, sterr) to display
virtual void	foreground (uint16_t colour)
	set the foreground color
virtual void	background (uint16_t colour)
	set the background color
Protected Member Functions
void	init ()
	Init command sequence.
void	wr_cmd8 (unsigned char cmd)
	Send 8bit command to display controller.
void	wr_data8 (unsigned char data)
	Send 8bit data to display controller.
void	wr_data16 (unsigned short data)
	Send 2x8bit data to display controller.
virtual void	wr_gram (unsigned short data)
	Send 16bit pixeldata to display controller.
virtual void	wr_gram (unsigned short data, unsigned int count)
	Send same 16bit pixeldata to display controller multiple times.
virtual void	wr_grambuf (unsigned short *data, unsigned int lenght)
	Send array of pixeldata shorts to display controller.
virtual unsigned short	rd_gram ()
	Read 16bit pixeldata from display controller (with dummy cycle)
virtual unsigned int	rd_reg_data32 (unsigned char reg)
	Read 4x8bit register data (with dummy cycle)
virtual unsigned int	rd_extcreg_data32 (unsigned char reg, unsigned char SPIreadenablecmd)
	Read 3x8bit ExtendedCommands register data.
void	hw_reset ()
	HW reset sequence (without display init commands)
virtual void	auto_gram_read_format ()
	Try to get read gram pixel format, could be 16bit or 18bit, RGB or BGR autoset internal flags so pixelread() will always return correct value.
virtual void	identify ()
	Try to identify display ID.

Detailed Description

Class for (quite)standard MIPI-DBI TypeB (parallel) and TypeC (spi) TFT display controller for Ilitek ILI9481, Renesas R61581, Raydium RM68042 to be copypasted and adapted for other controllers.

Definition at line 13 of file TFT_MIPI.h.

Constructor & Destructor Documentation

TFT_MIPI	(	proto_t	displayproto,
		PortName	port,
		PinName	CS,
		PinName	reset,
		PinName	DC,
		PinName	WR,
		PinName	RD,
		const char *	name,
		unsigned int	LCDSIZE_X = `320`,
		unsigned int	LCDSIZE_Y = `480`
	)

Create a PAR display interface.

Parameters:

displayproto	PAR_8 or PAR_16
port	GPIO port name to use
CS	pin connected to CS of display
reset	pin connected to RESET of display
DC	pin connected to data/command of display
WR	pin connected to SDI of display
RD	pin connected to RS of display
name	The name used by the parent class to access the interface
LCDSIZE_X	x size in pixel - optional
LCDSIZE_Y	y size in pixel - optional

Definition at line 18 of file TFT_MIPI.cpp.

TFT_MIPI	(	proto_t	displayproto,
		int	Hz,
		PinName	mosi,
		PinName	miso,
		PinName	sclk,
		PinName	CS,
		PinName	reset,
		PinName	DC,
		const char *	name,
		unsigned int	LCDSIZE_X = `320`,
		unsigned int	LCDSIZE_Y = `480`
	)

Create an SPI display interface.

Parameters:

displayproto	SPI_8 or SPI_16
Hz	SPI speed in Hz
mosi	SPI pin
miso	SPI pin
sclk	SPI pin
CS	pin connected to CS of display
reset	pin connected to RESET of display
DC	pin connected to data/command of display
name	The name used by the parent class to access the interface
LCDSIZE_X	x size in pixel - optional
LCDSIZE_Y	y size in pixel - optional

Definition at line 32 of file TFT_MIPI.cpp.

Member Function Documentation

int _putc ( int value ) [virtual, inherited]

put a char on the screen

Parameters:

value char to print

Returns:: printed char

Reimplemented from TextDisplay.

Definition at line 256 of file GraphicsDisplay.cpp.

void auto_gram_read_format ( ) [protected, virtual, inherited]

Try to get read gram pixel format, could be 16bit or 18bit, RGB or BGR autoset internal flags so pixelread() will always return correct value.

Definition at line 310 of file TFT.cpp.

void background ( uint16_t colour ) [virtual, inherited]

set the background color

Note:: this method may be overridden in a derived class.

Parameters:

color is color to use for background drawing.

Definition at line 61 of file TextDisplay.cpp.

void Bitmap	(	int	x,
		int	y,
		int	w,
		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 349 of file GraphicsDisplay.cpp.

void Bitmap_BW	(	Bitmap_s	bm,
		int	x,
		int	y
	)		`[inherited]`

paint monochrome bitmap to screen

Parameters:

bm	Bitmap in flash
x	x start
y	y start

Definition at line 324 of file GraphicsDisplay.cpp.

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

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

Parameters:

x,y	: position of upper left corner
*Name_BMP	name of the BMP file with drive: "/local/test.bmp"

Returns:: 1 if bmp file was found and painted; 0 if bmp file was found not found; -1 if file is no bmp; -2 if bmp file is no 16 bit bmp; -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 or SD card

Definition at line 375 of file GraphicsDisplay.cpp.

void BusEnable ( bool enable ) [virtual, inherited]

Set ChipSelect high or low.

Parameters:

enable true/false

Definition at line 161 of file 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

Implements TextDisplay.

Definition at line 270 of file GraphicsDisplay.cpp.

void circle	(	int	x,
		int	y,
		int	r,
		unsigned short	color
	)		`[virtual, inherited]`

draw a circle

Parameters:

x0,y0	center
r	radius
color	16 bit color *

Definition at line 60 of file GraphicsDisplay.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

Note:: this method may be overridden in a derived class.

Returns:: true if the claim succeeded.

Definition at line 65 of file TextDisplay.cpp.

void cls ( void ) [virtual, inherited]

clear the entire screen The inherited one sets windomax then fill with background color We override it to speedup

Reimplemented from GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 302 of file TFT.cpp.

int columns ( ) [virtual, inherited]

Get the number of columns based on the currently active font.

Returns:: number of columns.

Note:: this method may be overridden in a derived class.

Implements TextDisplay.

Definition at line 228 of file GraphicsDisplay.cpp.

virtual void copy_to_lcd ( void ) [virtual, inherited]

Framebuffer is not used for TFT.

Implements GraphicsDisplay.

Definition at line 97 of file TFT.h.

void FastWindow ( bool enable ) [inherited]

Enable fast window (default disabled) used to speedup functions that plots single pixels, like circle, oblique lines or just sparse pixels.

Parameters:

enable true/false

Note:: most but not all controllers support this, even if datasheet tells they should

Definition at line 202 of file TFT.cpp.

void fillcircle	(	int	x,
		int	y,
		int	r,
		unsigned short	color
	)		`[virtual, inherited]`

draw a filled circle

Parameters:

x0,y0	center
r	radius
color	16 bit color *

Definition at line 77 of file GraphicsDisplay.cpp.

void fillrect	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		unsigned short	color
	)		`[virtual, inherited]`

draw a filled rect

Parameters:

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

Definition at line 209 of file GraphicsDisplay.cpp.

void foreground ( uint16_t colour ) [virtual, inherited]

set the foreground color

Note:: this method may be overridden in a derived class.

Parameters:

color is color to use for foreground drawing.

Definition at line 57 of file TextDisplay.cpp.

bool get_auto_up ( void ) [inherited]

get status of the auto update function

Returns:: if auto update is on

Definition at line 474 of file GraphicsDisplay.cpp.

int height ( ) [inherited]

get the current oriented screen height in pixels

Returns:: screen height in pixels.

Definition at line 56 of file GraphicsDisplay.cpp.

void hline	(	int	x0,
		int	x1,
		int	y,
		unsigned short	color
	)		`[inherited]`

draw a horizontal line

Parameters:

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

Definition at line 98 of file GraphicsDisplay.cpp.

void hw_reset ( ) [protected, inherited]

HW reset sequence (without display init commands)

Definition at line 156 of file TFT.cpp.

void identify ( ) [protected, virtual, inherited]

Try to identify display ID.

Note:: support ILI9341,94xx, MIPI standard. May be be overridden in Init class for other specific IC

Reimplemented in ILI9327.

Definition at line 331 of file TFT.cpp.

void init ( ) [protected]

Init command sequence.

Definition at line 47 of file TFT_MIPI.cpp.

void invert ( unsigned char o ) [inherited]

display inverted colors

Parameters:

o	= 0 normal, 1 invert

Definition at line 197 of file TFT.cpp.

void line	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		unsigned short	color
	)		`[virtual, inherited]`

draw a 1 pixel line

Parameters:

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

Definition at line 116 of file GraphicsDisplay.cpp.

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

setup cursor position for text

Parameters:

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

Reimplemented from TextDisplay.

Definition at line 223 of file GraphicsDisplay.cpp.

void pixel	(	int	x,
		int	y,
		unsigned short	color
	)		`[virtual, inherited]`

Draw a pixel in the specified color.

Parameters:

x	is the horizontal offset to this pixel.
y	is the vertical offset to this pixel.
color	defines the color for the pixel.

Implements GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 233 of file TFT.cpp.

unsigned short pixelread	(	int	x,
		int	y
	)		`[virtual, inherited]`

Read pixel color at location.

Parameters:

x	is the horizontal offset to this pixel.
y	is the vertical offset to this pixel.

Returns:: 16bit color.

Reimplemented in SEPS225.

Definition at line 255 of file TFT.cpp.

unsigned int rd_extcreg_data32	(	unsigned char	reg,
		unsigned char	SPIreadenablecmd
	)		`[protected, virtual, inherited]`

Read 3x8bit ExtendedCommands register data.

Parameters:

reg	the register to read
SPIreadenablecmd	vendor/device specific cmd to read EXTC registers

Returns:: data as uint

Note:: EXTC regs (0xB0 to 0xFF) are read/write registers but needs special cmd to be read in SPI mode

Definition at line 139 of file TFT.cpp.

unsigned short rd_gram ( ) [protected, virtual, inherited]

Read 16bit pixeldata from display controller (with dummy cycle)

Note:: autoconverts 18to16bit based on display identify info

Returns:: 16bit color

Definition at line 131 of file TFT.cpp.

unsigned int rd_reg_data32 ( unsigned char reg ) [protected, virtual, inherited]

Read 4x8bit register data (with dummy cycle)

Parameters:

reg	the register to read

Returns:: data as uint

Definition at line 135 of file TFT.cpp.

void rect	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		unsigned short	color
	)		`[virtual, inherited]`

draw a rect

Parameters:

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

Reimplemented in SEPS225.

Definition at line 187 of file GraphicsDisplay.cpp.

int rows ( ) [virtual, inherited]

Get the number of rows based on the currently active font.

Returns:: number of rows.

Note:: this method may be overridden in a derived class.

Implements TextDisplay.

Definition at line 232 of file GraphicsDisplay.cpp.

void scroll ( int lines ) [inherited]

Scroll up(or left) the scrollarea.

Parameters:

lines number of lines to scroll, 1= scrollup 1, areasize-1= scrolldown 1

Definition at line 293 of file TFT.cpp.

void scrollreset ( ) [inherited]

Reset the scrollarea and display un-scrolled screen.

Definition at line 298 of file TFT.cpp.

void set_auto_up ( bool up ) [inherited]

setup auto update of screen

Parameters:

up	1 = on , 0 = off if switched off the program has to call copy_to_lcd() to update screen from framebuffer

Definition at line 466 of file GraphicsDisplay.cpp.

void set_font	(	unsigned char *	f,
		unsigned char	firstascii = `32`,
		unsigned char	lastascii = `127`,
		bool	proportional = `true`
	)		`[inherited]`

select the font to use

Parameters:

f	pointer to font array
firstascii	first ascii code present in font array, default 32 (space)
lastascii	last ascii code present in font array, default 127 (DEL)
proportional	enable/disable variable font width (default enabled)

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 (not used in this revision, set to whatever)
the vertial size in pixel
the horizontal size in pixel
the number of byte per vertical line (not used in this revision, set to whatever) you also have to change the array to cont unsigned char[] and __align(2)

Definition at line 236 of file GraphicsDisplay.cpp.

void set_font_zoom	(	unsigned char	x_mul,
		unsigned char	y_mul
	)		`[inherited]`

Zoom fount.

Parameters:

x_mul	horizontal size multiplier
y_mul	vertical size multiplier

Definition at line 251 of file GraphicsDisplay.cpp.

void set_height ( int height ) [inherited]

set the current oriented screen height in pixels

Parameters:

height screen height in pixels.

Definition at line 48 of file GraphicsDisplay.cpp.

void set_orientation ( int o ) [virtual, inherited]

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

Parameters:

o	direction to use the screen (0-3) 0 = default 0° portrait view 1 = +90° landscape view 2 = +180° portrait view 3 = -90° landscape view

Definition at line 166 of file TFT.cpp.

void set_width ( int width ) [inherited]

set the current oriented screen width in pixels

Parameters:

width screen width in pixels.

Definition at line 44 of file GraphicsDisplay.cpp.

void setscrollarea	(	int	startY,
		int	areasize
	)		`[inherited]`

Set scroll area boundaries scroll is done in hw but only on the native vertical axis TFTs are mainly native protrait view, so horizontal scroll if rotated in landscape view.

Parameters:

startY	boundary offset from top (or left if rotated), 0 for fullscreen scroll
areasize	size of the scroll area, 480 for fullscreen scroll of a 320x480 display

Definition at line 281 of file TFT.cpp.

int sizeX ( ) [inherited]

get display X size in pixels (native, orientation independent)

Returns:: X size in pixels

Definition at line 361 of file TFT.cpp.

int sizeY ( ) [inherited]

get display Y size in pixels (native, orientation independent)

Returns:: Y size in pixels

Definition at line 365 of file TFT.cpp.

void vline	(	int	y0,
		int	y1,
		int	x,
		unsigned short	color
	)		`[inherited]`

draw a vertical line

Parameters:

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

Definition at line 107 of file GraphicsDisplay.cpp.

int width ( ) [inherited]

get the current oriented screen width in pixels

Returns:: screen width in pixels.

Definition at line 52 of file GraphicsDisplay.cpp.

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

Set the window, which controls where items are written to the screen.

When something hits the window width, it wraps back to the left side and down a row. If the initial write is outside the window, it will be captured into the window when it crosses a boundary.

Parameters:

x	is the left edge in pixels.
y	is the top edge in pixels.
w	is the window width in pixels.
h	is the window height in pixels.

Implements GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 207 of file TFT.cpp.

void window4read	(	int	x,
		int	y,
		int	w,
		int	h
	)		`[virtual, inherited]`

Set the window from which gram is read from.

Autoincrements row/column

Parameters:

x	is the left edge in pixels.
y	is the top edge in pixels.
w	is the window width in pixels.
h	is the window height in pixels.

Reimplemented in SEPS225.

Definition at line 220 of file TFT.cpp.

void window_pushpixel	(	unsigned short	color,
		unsigned int	count
	)		`[virtual, inherited]`

Push some pixels of the same color into the window and increment position.

You must first call window() then push pixels.

Parameters:

color	is the pixel color.
count,:	how many

Implements GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 148 of file TFT.cpp.

void window_pushpixel ( unsigned short color ) [virtual, inherited]

Push a single pixel into the window and increment position.

You must first call window() then push pixels.

Parameters:

color is the pixel color.

Implements GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 144 of file TFT.cpp.

void window_pushpixelbuf	(	unsigned short *	color,
		unsigned int	lenght
	)		`[virtual, inherited]`

Push array of pixel colors into the window and increment position.

You must first call window() then push pixels.

Parameters:

color is the pixel color.

Implements GraphicsDisplay.

Reimplemented in SEPS225.

Definition at line 152 of file TFT.cpp.

void WindowMax ( void ) [virtual, inherited]

Set window to max possible size May be overridden in a derived class.

Definition at line 40 of file GraphicsDisplay.cpp.

void wr_cmd8 ( unsigned char cmd ) [protected, inherited]

Send 8bit command to display controller.

Parameters:

cmd,: byte to send

Note:: if protocol is SPI16, it will insert NOP cmd before, so if cmd is a 2byte cmd, the second cmd will be broken. Use wr_cmd16 for 2bytes cmds

Definition at line 106 of file TFT.cpp.

void wr_data16 ( unsigned short data ) [protected, inherited]

Send 2x8bit data to display controller.

Parameters:

data,: halfword to send

Definition at line 115 of file TFT.cpp.

void wr_data8 ( unsigned char data ) [protected, inherited]

Send 8bit data to display controller.

Parameters:

data,: byte to send

Definition at line 111 of file TFT.cpp.

void wr_gram	(	unsigned short	data,
		unsigned int	count
	)		`[protected, virtual, inherited]`

Send same 16bit pixeldata to display controller multiple times.

Parameters:

data,:	halfword to send
count,:	how many

Definition at line 123 of file TFT.cpp.

void wr_gram ( unsigned short data ) [protected, virtual, inherited]

Send 16bit pixeldata to display controller.

Parameters:

data,: halfword to send

Definition at line 119 of file TFT.cpp.

void wr_grambuf	(	unsigned short *	data,
		unsigned int	lenght
	)		`[protected, virtual, inherited]`

Send array of pixeldata shorts to display controller.

Parameters:

data,:	unsigned short pixeldata array
lenght,:	lenght (in shorts)

Definition at line 127 of file TFT.cpp.

Type:	Library
Created:	21 May 2017
Imports:	166
Forks:	0
Commits:	39
Dependents:	2
Dependencies:	0
Followers:	2

TFT_MIPI Class Reference

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Repository toolbox

Repository details

Important Information for this Arm website

TFT_MIPI Class Reference

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Repository toolbox

Repository details

Important Information for this Arm website

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