ECE 477 Design Review ECE 477 Design Review Team 09 Team 09 Spring 2010 Spring 2010

LukeEthan

Andy

Dhruv

OutlineOutline• Project overview Project overview • Project-specific success criteriaProject-specific success criteria• Block diagramBlock diagram• Component selection rationaleComponent selection rationale• Packaging designPackaging design• Schematic and theory of operationSchematic and theory of operation• PCB layoutPCB layout• Software design/development statusSoftware design/development status• Project completion timelineProject completion timeline• Questions / discussionQuestions / discussion

Project OverviewProject Overview

The Huge Universal Language Keyboard (HULK) is a keyboard whose keys can be dynamically changed to display several different languages’ characters.

Main Features:• Loads languages from SD card • Touch-screen to select language• Displays languages’ characters on an internal VGA

monitor• Uses physical keys with tactile feedback• PS/2 interface to host PC

Project-Specific Success CriteriaProject-Specific Success Criteria

• An ability to display a languages’ characters as a keyboard layout on an LCD screen.

• An ability to change the language displayed on the keyboard by selecting a new language on a touch-screen menu.

• An ability to receive and decode a key press as a meaningful character.

• An ability to send and display a language’s characters on a host PC through a PS/2 interface.

• An ability to load languages from an SD card.

Block DiagramBlock Diagram

Motherboard PCB

Keyboard PCB

61

61 Keyboard

Keys

61 Pull-Up Resistors

61

8 8-bit Shift Registers

SPI

3

Micro

SPI

Host PC

data clk

PS/2

Touchscreen

SD Card Reader

SPI

4

Dual-Port SRAM

32

25MHz Oscillator

8-bit Shift Register

Horizontal Sync PLD

Vertical Sync PLD

Shift Enable

8R

G

B

HS

VS

VG

A C

onne

ctor

SPI4

16

Component Selection RationaleComponent Selection Rationale

• Microcontroller - PIC32MX360F512LMicrocontroller - PIC32MX360F512L– 85 GPIO pins, 4 SPI, 512K Flash85 GPIO pins, 4 SPI, 512K Flash– MIPS coreMIPS core– Development board available in labDevelopment board available in lab

• Touch Screen – LCD-010Touch Screen – LCD-010– Physical sizePhysical size– Touch screen and LCD all-in-one packageTouch screen and LCD all-in-one package– Good sample code availableGood sample code available

Component Selection Rationale

• 1 Mbit SRAM – CY7C09099V-6AXC1 Mbit SRAM – CY7C09099V-6AXC– Dual portDual port– Big enough for bitmap filesBig enough for bitmap files– Fast enough for VGA videoFast enough for VGA video– Internal address burst counterInternal address burst counter

• Programmable Logic Devices – GAL26CV12BProgrammable Logic Devices – GAL26CV12B

– Number of macrocellsNumber of macrocells– Availability of parts/programmersAvailability of parts/programmers– Fast enough for VGA videoFast enough for VGA video

Packaging DesignPackaging Design

Packaging Design

• 2 PCBs (Motherboard and Keyboard)– 5 wire connector between them– VGA connection from motherboard to monitor

• Keyboard sits directly on top of VGA monitor• Keys are clear plastic pieces sitting on SMT

pushbuttons• Thickness of internal monitor determines

thickness of overall package• All contained in manufactured box (if available);

else homemade balsa wood box

Motherboard Schematic: MCU

Motherboard Schematic: Touch-screen

Motherboard Schematic: SD Card Reader

Motherboard Schematic: VGA Circuitry

Keyboard Schematic

Power SchematicPower Schematic

Theory of Operation

Motherboard PCB

Keyboard PCB

61

61 Keyboard

Keys

61 Pull-Up Resistors

61

8 8-bit Shift Registers

SPI

3

Micro

SPI

Host PC

data clk

PS/2

Touchscreen

SD Card Reader

SPI

4

Dual-Port SRAM

32

25MHz Oscillator

8-bit Shift Register

Horizontal Sync PLD

Vertical Sync PLD

Shift Enable

8R

G

B

HS

VS

VG

A C

onne

ctor

SPI4

16

Theory of Operation – Touch-screen

5 V

5 V

CLKTC_CSMISO

MOSI

Bidirectional Data Bus

Back Light

RS

RDWR

Busy

LCD_CS

Reset

Pen

Theory of Operation - VGA

Micro

A0-A16

ADS

CE0-CE1

CNTEN

CNTRST

I/O0-I/O7

OE

R/W

FT/PIPE

Vcc

17

2

8

A0-A16

ADS

CE0-CE1

CNTEN

CNTRST

I/O0-I/O7

OE

R/W

FT/PIPE Vcc

2

17

8

VS PLD

CLK

CLK HS PLD

VS_Out

HS_Out

CNTRST

SR

AM

25.175MHz Oscillator

External Clock

HS_In

read_byte

Shift Register VG

A C

onnector

0

1

2

14

13

CLK

shift_enable

CLK

shift_enable

PCB Layout - MotherboardPCB Layout - Motherboard

PCB Layout - Keyboard

127

.00

260.00

13.

00

RP

SR

SR

SR

SR

SR

SR

SR

SR

SR

SR

RP

RP

RP

RP

305.00

11.

00

17.00 2.00

6.50

10.

00 10.

00

6.50

11.00

11.00

10.00

2.0

0

Q W E R T Y U I O P [ ] \

1 2 3 4 5 6 7 8 Backspace9 0 - =

A S D F G H J K L ; ‘ EnterCaps

Z X C V B N M , . / ShiftShift

Space AltAlt~Ctrl

Tab

PCB Layout - Keyboard

Software Design/Development StatusSoftware Design/Development Status

• Boot-UpBoot-Up– Load data from SD card to MCU flashLoad data from SD card to MCU flash– Write default language to SRAMWrite default language to SRAM– Set burst counter start addressSet burst counter start address– Write touch-screen image informationWrite touch-screen image information

• Normal OperationNormal Operation– Key presses and touch-screen touches generate Key presses and touch-screen touches generate

interruptsinterrupts– VGA circuitry runs without interruption unless a VGA circuitry runs without interruption unless a

new language is selectednew language is selected

Project Completion TimelineProject Completion Timeline

• Week 8 - Schematics and PCBs FinalizedWeek 8 - Schematics and PCBs Finalized• Week 9 - PLDs programmed / VGA circuit testedWeek 9 - PLDs programmed / VGA circuit tested• Week 10 – Touch screen fully tested and functionalWeek 10 – Touch screen fully tested and functional• Week 11 – Key decoding and SD card programmingWeek 11 – Key decoding and SD card programming• Week 12 – PS/2 and host PC interfaceWeek 12 – PS/2 and host PC interface• Week 13 – Keyboard PCB with keys assembledWeek 13 – Keyboard PCB with keys assembled• Week 14 - Packaging finishedWeek 14 - Packaging finished• Week 15 - Paperwork and final reportWeek 15 - Paperwork and final report• Week 16 - DemonstrationWeek 16 - Demonstration

Questions / DiscussionQuestions / Discussion