Critical Design Review
February 28, 2006
Brianna Bethel
Robert Havlik
Jessica Lowry
Alex Silva
Outline
• Project Overview
• Hardware Description
– Description of each unit and its schematic
•
•
•
•
Software Processes
Division of Labor
Updated Schedule
Parts and Cost
Project Overview
• To create a standalone, portable, easy-touse system to display pictures without a
computer
• Display pictures on a color LCD screen
• Include user interface
• Stores and retrieves pictures
from Compact Flash cards
Hardware Block Diagram
Touchscreen
Baseline
Future
Revisions
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
Host Computer
USB
Power
Reset
Compact
Flash Card
Power System
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• 12V DC Wall Input
– 12V supplies backlight
inverter for LCD
• Regulated to 3.3 V
– Supplies microcontroller
and peripherals
• 1.8 V regulator in processor
• Isolated analog sections
• Power and Ground Planes
Power System Schematic
Microcontroller
• Features
– LCD controller
– 24 bit address, 16 bit data
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• Functions
– Runs Software and
Embedded Linux
– Controls all memory
devices and timing for
LCDs
Microcontroller Schematic
Reset and Oscillator Circuits
• Two oscillators
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
– 11.2896 MHz
– 32.768 KHz
• Reset in a box
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
– Pushbutton reset
– Power monitoring
Reset (and Oscillator) Schematic
Hardware Memory Map
SDRAM
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• 256 Mbits (32 MB)
• Functions
– Primary run-time
application storage
– Software,
Bootloader and
Embedded Linux
run-time
environment
SDRAM Schematic
Buffers
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• Isolates SDRAM
from other memory
devices
• Boosts system signal
integrity
Buffer Schematics
NOR and NAND Flash Memory
• NOR
– 128 Mbit (16 MB)
Touchscreen
IR Sensor
and Remote
• NAND
– 512 Mbit (64 MB)
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• Large, non-volatile
memory storage
• Contains bootloader
• Programmed through
JTAG Wiggler
(Sparkfun)
NOR Flash Schematic
NAND Flash Schematic
SRAM Memory
• 4 Mbits (256 kB)
• Functions
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
– Additional storage
– Frame buffer
– Backup if SDRAM
is not functional
SRAM Schematic
Compact Flash
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
• Large, non-volatile
storage device
• Memory mode only
• Sparkfun breakout
board
Compact Flash Schematic
Serial RS-232 and IR Connectors
• RS-232
Touchscreen
IR Sensor
and Remote
LCD Display (STN or TFT)
SRAM
User
Interface
Buttons
SDRAM
Sharp Microcontroller
LH79525
NOR Flash
Buffers
Serial
Interface
NAND Flash
Oscillator
USB
Power
Reset
Compact
Flash Card
– 115 kbps
– Tera Term host
interface
• Infrared
– Serial interface
Serial RS-232 and IR
Connectors Schematic
Software Block Diagram
Model
«delegate»
Display Picture Controller
«delegate»
SlideShow Controller
+start()
+stop()
+start_timer()
+picture.display()
+wait_for_timer()
+start()
+picture_display()
«utility»
Slideshow Timer
-Time_To_Wait
«delegate»
Modify Picture Controller
+start()
+stop()
+start()
uses
«utility»
Picture
-file name
+display()
+crop()
+rotate()
+zoom()
+retrieve()
+nextImg()
+previousImg()
invokes
View
«interface»
TouchScreenInputHandler
+ProcessXYcoordinateInput() : int
«delegate»
ApplicationLauncher
Selects
Model
(Main Functions)
Modifies
«interface»
DisplayMenu
+Select_Function()
uses
View
(User Interface)
invokes
Controller
retrieves data
from
«interface»
FileSystem
+RetrieveFile()
+WriteFile()
+GetFileNames()
«implementation class»
TouchscreenDriver
retrieves data
from
«implementation class»
MediaDriver
-File Data
+OpenFile()
+CloseFile()
Linux
«implementation class»
LCDDisplayDriver
-ApplicationInterface
retrieves data
from
«implementation class»
TFTLCDdriver
-FrameBuffer
+DisplaySettings
«implementation class»
STNLCDdriver
-FrameBuffer
+DisplaySettings
Controller
(Drivers)
View
«interface»
TouchScreenInputHandler
+ProcessXYcoordinateInput() : int
Selects
«delegate»
ApplicationLauncher
+Select_Function()
Modifies
«interface»
DisplayMenu
Model
Model
«delegate»
Display Picture Controller
+start()
+picture_display()
«delegate»
SlideShow Controller
+start()
+stop()
+start_timer()
+picture.display()
+wait_for_timer()
uses
«utility»
Picture
-file name
+display()
+crop()
+rotate()
+zoom()
+retrieve()
+nextImg()
+previousImg()
«utility»
Slideshow Timer
-Time_To_Wait
«delegate»
Modify Picture Controller
+start()
+stop()
+start()
Controller
invokes
Controller
retrieves data
from
«interface»
FileSystem
+RetrieveFile()
+WriteFile()
+GetFileNames()
«implementation class»
TouchscreenDriver
retrieves data
from
«implementation class»
MediaDriver
-File Data
+OpenFile()
+CloseFile()
Linux
«implementation class»
LCDDisplayDriver
-ApplicationInterface
retrieves data
from
«implementation class»
TFTLCDdriver
-FrameBuffer
+DisplaySettings
«implementation class»
STNLCDdriver
-FrameBuffer
+DisplaySettings
Development Environment
• Programming in C
• Compilation
– Compile in Arm Developer Suite (or
Cygwin)
• ADS and Linux have similar code files
– Color LCD panel initialization
– Creates templates for custom
development
Embedded Linux
• Functions
– Handles hardware
initialization
– Compact Flash driver
– Allows for higher level
applications
– Source code for future
applications
Division of Labor
Task
Responsible Team
 PCB Design
 Embedded Linux
• Hardware Engineers
All
All
Rob & Alex
– JTAG Wiggler
– PCB Placement of Parts
• Software Engineers
– LCD Driver (Dev board and custom)
– Display Single Picture
– Timer for Slideshow
Brianna & Jessica
Milestone 1 : March 21
• Have custom hardware running
• Second revision ready for fabrication
• LCD Driver
– Display still picture on LCD screen
Milestone 2 : April 18
• Have slideshow program functional
• User interface development
– Touchscreen
• Implement possible extensions, time
permitting
Capstone Expo : May 4
• Everything completed and working 
Schedule
Current Progress
• Microcontroller
with Linux Loaded
– Includes custom
Linux kernel
• Hardware Layout
and Routing
Complete
• Custom PCB ready
to be sent out
PCB Layout Rev 0
PCB 3D
Budget
Questions?