LCDInfo USBD480-WQ43 Manuale utente

USBD480-WQ43 User Guide

Preliminary

Version 0.2

www.lcdin o.com

USBD480-WQ43 User Guide

Table of Contents

1. Introduction......................................................................................................................................4

Overview..........................................................................................................................................4

Features............................................................................................................................................4

. Physical Characteristics....................................................................................................................5

3. Electrical Characteristics..................................................................................................................5

4. USBD480-WQ43 module................................................................................................................6

5. Pin descriptions................................................................................................................................7

USB connector – J3.........................................................................................................................7

GPIO connector – J4........................................................................................................................7

6. Getting started..................................................................................................................................8

Connecting the display module........................................................................................................8

7. Programming interface.....................................................................................................................8

Overview..........................................................................................................................................8

Framebuffer memory addressing.....................................................................................................8

Pixel format......................................................................................................................................8

Windows API DLL..........................................................................................................................8

Linux framebuffer driver.................................................................................................................9

Linux X.Org driver..........................................................................................................................9

Direct USB device access................................................................................................................9

Other interfaces................................................................................................................................9

8. Direct USB command interface......................................................................................................10

Overview........................................................................................................................................10

Vendor requests.............................................................................................................................10

SET_ADDRESS 0xC0..........................................................................................................10

SET_FRAME_START_ADDRESS 0xC4.............................................................................11

GET_DEVICE_DETAILS 0x80............................................................................................11

SET_BRIGHTNESS 0x81.....................................................................................................11

SET_CONFIG_VALUE 0x8 ...............................................................................................1

GET_CONFIG_VALUE 0x83..............................................................................................1

GET_SAVED_CONFIG_VALUE 0x86................................................................................1

SAVE_CONFIGURATION 0x84..........................................................................................13

SET_TOUCH_MODE 0xE ..................................................................................................13

SET_STREAM_DECODER 0xC6.........................................................................................13

Configuration parameters..............................................................................................................14

TOUCH_MODE .................................................................................................................14

TOUCH_DEBOUNCE_VALUE 3.........................................................................................14

TOUCH_SKIP_SAMPLES 4.................................................................................................14

TOUCH_PRESSURE_LIMIT_LO 5.......................................................................................15

TOUCH_PRESSURE_LIMIT_HI 6.......................................................................................15

BACKLIGHT_BRIGHTNESS 0..........................................................................................15

USB_ENUMERATION_MODE .......................................................................................15

Bulk endpoint.................................................................................................................................16

Stream decoder..............................................................................................................................16

WRITE 0x5B41....................................................................................................................16

FRAMEBASE 0x5B4 .........................................................................................................17

WRAPLENGTH 0x5B43......................................................................................................17

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USBD480-WQ43 User Guide

9. Touchscreen interface.....................................................................................................................18

10. Appendix A – Dimensional drawings..........................................................................................19

11. Document revision history........................................................................................................... 0

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USBD480-WQ43 User Guide

1. Introduction

Overview

The USBD480-WQ43 is a 4.3” TFT display with USB interface. The controller board provides

framebuffer functionality and offers a Hi-Speed USB .0 interface for connecting to the host

system.

USBD480 provides a quick and easy to way to add a display to systems that have USB host ports.

The host system can be an embedded device or a PC computer. For best performance a Hi-Speed

(480 Mbps) USB host capability is recommended.

It is also possible to use the display as an input user interface with the optional touchscreen.

Features

•4.3" 480x 7 pixel resolution color TFT LCD

•Optional touchscreen

•Hi-Speed USB interface 480 Mbps

•16 bit colors (RGB565)

•8 MB framebuffer memory (available for double buffering etc.) 1)

•Display can be updated at 80-90 full frames per second over USB )

•USB powered

•User configurable startup image

•Custom versions of the controller board possible for different display panels

Note:

1. For custom applications support for larger framebuffer sizes has been implemented

. If required by the application it would be possible to increase the speed at the expense of

some increased power consumption

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USBD480-WQ43 User Guide

2. Physical Characteristics

Item Specifications Unit

Display resolution 480 x 7 dot

Screen size 10.9 (4.3” type) diagonal cm

Active area 95.04(H) x 53.856(V) mm

Pixel pitch 0.198 x 0.198 mm

Unit outline dimensions 1) 1 0(W) x 67. (H) x ___(D) mm

Weight 90 (Typ.) g

Backlight type LED

Note:

1. Includes mounting tabs

3. Electrical Characteristics

Parameter Symbol Min. Typ. Max. Unit

Supply Voltage VCC 4.75 5.0 5. 5 V

Current Consumption without backlight 1) mA

Backlight Current Consumption full brightness mA

Note:

1. Including LCD panel, USB data transfer in progress

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4. USBD4 0-WQ43 module

For more details see dimensional drawings in Appendix

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5. Pin descriptions

USB connector – J3

The USB connector is used as the communication interface and the power supply for the display

module. The connector used is a mini USB B type connector. When connecting the display some

care should be taken to use a good quality USB cable.

Pin Name Function

1 VBUS +5 VDC

D- Data -

3 D+ Data +

4 NC Unconnected

5 GND Ground

GPIO connector – J4

0 way 0.5 mm pitch FFC/FPC connector.

Pin Name Function

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USBD480-WQ43 User Guide

6. Getting started

Connecting the displa module

The USB connector is used as the communication interface and as the power supply for the display

module. The connector used is the common mini USB B type connector. When connecting the

display some care should be taken to use a good quality USB cable.

7. Programming interface

Overview

USBD480 is a composite USB device with two interfaces. First interface is for the main display

functionality and the second interface is for touchscreen input.

Framebuffer memor addressing

The controller has 8 MB of memory available for storing the image data. The memory size of 4096

x 56 x 16 bits makes for a total of 1048576 different addresses, 16 bits of data per address. One

frame requires 480 x 7 x = 611 0 bytes of memory. This means that it is possible to store 3

separate full frames of image data to the controller memory. Aligning the start address for each

frame to the 51 byte boundaries results in a bit more efficient memory bandwidth use.

Double buffering can be implemented using two alternating frames in the memory. The actual

address change for the SET_FRAME_START_ADDRESS command is synchronized with VSYNC

in the controller hardware.

It is also possible to implement hardware accelerated vertical scrolling by first filling the controller

memory with video data and then just changing the frame start address to scroll the image.

Pixel format

The USBD480 controller uses the RGB565 pixel format. One pixel consists of 16 bits of data – 5

bits red, 6 bits green and 5 bits blue. This results in 65536 different colors.

R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B4 B3 B2 B1 B0

Windows API DLL

For Windows there exists a DLL interface that provides an API that can be used for accessing the

display. When using the DLL it is not necessary to know the low level details of accessing the USB

device. The DLL also automatically detects and uses the available USB driver installed in the

system. The currently available options for the USB driver are Libusb or the UMDF USB driver.

Two alternative drivers make it possible to support a wider range of Windows versions and with the

DLL automatically detecting the driver the user doesn't need to know which one is installed in the

system.

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USBD480-WQ43 User Guide

The API interface is described in a separate document.

Linux framebuffer driver

When Linux is used one possible way to access the display is to use the USBD480 framebuffer

kernel driver. This driver makes the USBD480 display appear as a normal Linux framebuffer

device (/dev/fb) which is used by many existing libraries for accessing display hardware. Qt

Embedded and SDL included for example. The driver also connects the touchscreen to the Linux

input API.

Linux X.Org driver

Direct USB device access

Direct access to the USB device is also possible if it is preferred instead of the existing library or if

the platform used doesn't have existing support libraries.

Other interfaces

There are also other libraries and drivers being developed that support using the USBD480

controller. See the website for more details about what is currently available. Also feel free to give

feedback if your application would need something different from the currently available offerings.

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USBD480-WQ43 User Guide

. Direct USB command interface

Overview

The display is controlled by sending USB vendor requests to the control endpoint. For image data

transfer bulk endpoints are used.

Another option is using the bulk endpoint exclusively for image data transfer and related

commands. This is possible using the stream decoder feature.

Vendor requests

SET_ADDRESS 0xC0

SET_FRAME_START_ADDRESS 0xC4

GET_DEVICE_DETAILS 0x80

SET_BRIGHTNESS 0x81

SET_CONFIG_VALUE 0x8

GET_CONFIG_VALUE 0x83

GET_SAVED_CONFIG_VALUE 0x86

SAVE_CONFIGURATION 0x84

SET_TOUCH_MODE 0xE

SET_STREAM_DECODER 0xC6

SET_ADDRESS 0xC0

This request sets the write address to the framebuffer.

bRequest wValue wIndex wLength Data

SET_ADDRESS Bits 15 to 0 of

the address

Bits 1 to 16 of

the address

0 None

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