xfest interface v1.1 - eetrend.comxilinx.eetrend.com/.../1754...xfest_interface_v1.1.pdf · Built...

Copyright © 2009. Avnet, Inc. All rights reserved.

11

Attention

The material contained in this presentation is the property of Avnet Electronics Marketing. Use of this material in it’s whole or in part is restricted to Avnet’s X-Fest program and Avnet employees. Any use by non-Avnet employees outside of the X-Fest program is prohibited.

For additional information, please contact Jim Beneke at Avnet ([email protected]).

Designing Your Product for the Human Experience


3What is “The Human Experience”

How do your customers interact with your product?

How do they feel while they are using your product?

..


4Objectives

See how the human-machine interface affects a product’s– Differentiation– Ease of use– Reliability– Cost

Learn how to start designing three popular human-machine interfaces

Show how to use a single device connected to the FPGA to enhance the human-machine interface


5Agenda

Trends in Human-Machine Interfaces

Human-Machine Interfaces on the Avnet Spartan-6 LX16 Evaluation Board– Touch-sensing buttons– Custom segment LCD– USB to PC

FPGA Design with Human-Machine Interfaces

Getting Started


6Agenda




Getting Started


7Human Machine Interfaces Trends

Fueled recently by extremely innovative products

Customers prefer products with– Elegant, durable industrial design– Intuitive operator panels and controls– Instant USB connectivity

....


8Touch-sensing is Elegant and Durable

Touch interfaces are– Elegant, modern, thin – Inexpensive copper

pad on PCB– Hermetically sealed– Easy to design in

Lasts longer– If mechanical switch,

dial, or keypad fails, then product fails

– High durability mechanical buttons are expensive

– No extra cost for touch interface durability

Air Cleaner

Laptop


9Custom Displays and Controls are Intuitive

Custom segment LCDs– Highly customizable– Anything you can draw, you

can build (fuel gauge, logo)– Surprisingly inexpensive

Integrate touch interfaces with a custom LCD for added intuitiveness

.


10The PC Provides a Window to the Machine

PCs are commonly used as the user interface to a machine

USB links the machine to the PC

USB


11Interfacing an FPGA to Humans

Touch, custom display, and USB interfaces are not native to the FPGA– How could they be implemented?

Implement each interface with an interface chip– Multiple interfaces require multiple chips

What about a single chip that adds touch, custom display, and USB interfaces? (And much more!)

..


12

• Mixers• PGAs• OpAmps

– Drop-in programmable digital• PWMs• Cyclic Redundancy Check• Quadrature decoders• USB 2.0 Full-speed

Introducing Cypress® PSoC®3?

PSoC = Programmable System-on-Chip Cypress’ 2nd generation platform Built around 8051 microprocessorUser-programmable– Drop-in programmable analog

peripherals• ADCs• DACs• TIAs

– Drop-in programmable digital peripherals• 8 to 32-bit timers• Counters• SPI• UART

Ultra low power with 0.5V to 5.5V voltage rangeFull-featured PSoC Creator™ Integrated Development Environment


13Avnet Spartan-6 LX16 Evaluation Kit

Xilinx Spartan-6 FPGA

Cypress PSoC 3

Touch-Sensing

Custom Segment LCD

Full-Speed USB

.....


14Questions

Who has previously designed with an FPGA?– Any with MicroBlaze™?

Who has previously designed with Cypress PSoC?– Who is familiar with PSoC 3?

...


15Agenda




Getting Started


16What is CapSense Touch-Sensing?

Projected capacitive technology– Better reliability than surface capacitive or resistive

Buttons Sliders Proximity Sensing

Touch pads

Detects presence/absence of a conductive object (specifically, a fingertip)


17Where Can You Use CapSense?

CapSense touch sensing works everywhere

PSoC Chip

CapSensePads

PCB


18Where Can You Use CapSense?

CapSense touch sensing works everywhere

Overlay

Any surface such as glass or plastic

Any environment such as rain or with gloves

PSoC

CapSense

Gloves

.


19How CapSense Works

Sensor Total Capacitance = CX

CX = CP + CF

Overlay

Copper Ground Copper GroundSensor

* Diagram not to scale

Dielectric

CP CP

CF

....


20Agenda




Getting Started


21LCD Requires an Analog Drive Chip

FPGA cannot drive analog waveforms required by LCDs– Driver chip required– FPGAs commonly interface to off-the-shelf LCD modules– Drive chips integrated onto module

PSoC integrates analog capability to directly drive LCDCapSense can be placed underneath LCD glass

FPGA PSoC 3 LCD Driver

Custom LCD Glass

Analog Drive Waveforms

FPGA

LCD Module

LCD Driver Standard LCD Glass

Analog Drive Waveforms

...


22Questions

Has anyone designed a custom segment LCD?– What was it for?

For those who haven’t, what would you expect:– Pay for non-recurring engineering (NRE) cost?– Minimum order quantity?– Per unit cost for a small display?

..


23Creating a Custom Segment LCD

Create a drawing– Visio, Paint, PPT

Specify module parameters– Commons, segments– Operating voltage– Connection type

• Pin or ribbon$2000 NRE – Design drawings – Five prototypes– 1000-piece pricing is

$2.13

..


24How LCDs Work

No Voltage Applied

Voltage Applied

.


25LCD- Working Principle

Side View Top View

Com

mon

Segment

Mirror

Liquid Crystal

..


26LCD- Working Principle

Side View Top View

Com

mon

Segment

Mirror

Liquid Crystal

Com

mon Liquid Crystal

Segment

.....


27LCD Driving

Commons/segments driven with analog waveforms– Waveforms must maintain 0V DC average – Prolonged DC voltage damages the display

PSoC 3 LCD drive– Designed to maintain 0V DC average – Delivers short bursts of potential to turn elements on

Two Types of Drive methods– Static– Multiplexed


28Multiplexed LCDs

Multiplexed LCDs are driven with more than one common– Static LCDs have only one common

Each segment and common drive multiple pixelsEach pixel tied to a unique common/segment pairReduces pin count, but driving is more complicatedExample: 4 elements using 4 pins instead of 5

Common

Seg 1 Seg 2

Seg 3 Seg 4

Static DriveSeg 1 Seg 2

Common 2

Common 1

Multiplexed Drive


29PSoC 3 Segment LCD Drive

Supports either static or multiplexed drive with built-in analog features– Up to 16 Commons– Maximum of 736 elements

Drive complex displays without an external driver Drive displays with fewer pins– More pins for peripheral

integration– Option for low pin count packages

Configurable LCD Pin Location– Shorter traces– Fewer PCB layers: no crossovers– Pin selection does not limit

functionality

36seg x 4com = 144 elements = 12seg x 12com

Save 16 pins!

PSoC 3Driver

36 4

FPGA FPGA

...

12 12


30LCD Direct Drive

PSoC Creator LCD Direct Drive Software Demo


31PSoC Creator Segment LCD Customizer


32PSoC Creator 14 Segment Helper


33PSoC Creator Bar Graph Helper


34Helper Function APIs

7 Segment– SegLCD_Write7SegDigit(uint8 Digit, uint8 Position);– SegLCD_Write7SegNumber(uint16 Value, uint8 Position, uint8 Mode);

14 Segment – SegLCD_PutChar14Seg_3(uint8 Character, uint8 Position);– SegLCD_WriteString14Seg_3(uint8* Character, uint8 Position);

Bar Graph– SegLCD_WriteBargraph(uint16 Location, uint8 Mode);


35Agenda




Getting Started


36Instant USB Connectivity

RS232 was standard, but– Electrically slow– Mechanically large– Not supported on many modern PCs

USB benefits– Plug & play– Driver native in Windows, Linux, Mac

• Communications Device Class enables COM port– Bus-power option– Small form-factor connectors– Data rate of 480 Mbps high-speed

• SuperSpeed USB 3.0 at 5Gbps coming• PSoC supports 12Mbps full-speed

Options available for simplifying USB design– Discrete USB-UART bridge chip– USB-equipped PSoC or MCU

..


37

Spartan-6BridgeChip

FPGA USB-UART Implementations

USB UART

Bridge chips are simple…

USB

Power

PSoC 3 Spartan-6UART

PC

SPI

Config

PSoC is a bridge, plus much more!

.


38PSoC Creator Makes USB Bridging Easy

Built-in USBUART Macro– Includes USBFS and UART

Example C code provided


39USB-UART on the PC

Simple driver installation– Install file automatically

generated by PSoC Creator– Uses built-in Windows driver

Looks like a COM port


40Virtual COM Port

Set any terminal emulator to the virtual COM portWrite application software the same as if using RS232

Windows PCSpartan LX16

Board

Windows Virtual COM Port USB Driver

Windows Application Serial Port

PSoCUSB-UART

Xilinx FPGA MicroBlaze

UART

USB Cable

Simple Serial Port Applications


41Application Development Example: AvProg

Simple Visual Basic programControls USB communication through built-in serial port callsUSB data used for– FPGA

configuration– Flash

programming and readback

– UART bridge terminal


42Agenda




Getting Started


43The Programmable Advantage

Spartan and PSoC are both programmableChoose the interconnecting interface that– Meets performance– Provides greatest ease of implementation– Has the fewest pins

Avnet Spartan-6 LX16 Evaluation board provides– CapSense via GPIO– LCD via SPI– USB via UART


44Easy Interfacing in Spartan-6

Use MicroBlaze™ to connect PSoC– Xilinx ISE™ Design Suite Embedded Edition

Built-in interface IP– UART, I2C, SPI, GPIO


45CapSense Touch-Sensing

PSoC 3 senses “touch” of PCB copper pad

PSoC drives the GPIO button logic

MicroBlaze reads the GPIO peripheral to register button pushes

Xilinx FPGA Cypress PSoC

GPIOuP

GP

IO

Cap

Sen

se

MicroBlaze

GP

IO


46Custom-segment LCDs

FPGA sends LCD display commands via SPI (or UART or I2C or GPIO or…)

PSoC receives commands over digital bus

PSoC drives analog waveforms to LCD

Xilinx FPGA Cypress PSoC

SPIuPSPISPI LCD

DriveMicroBlaze


47USB-UART Bridge

MicroBlaze communicates over UART

PSoC translates UART data to USB

PC communicates over USB via a Virtual COM Port

UA

RT

US

B-F

S

UA

RT


48Tools for MicroBlaze Design - BSB

Base System Builder– Wizard for

generating MicroBlaze designs

BSB can provide a system customized for the Spartan-6 LX16 Evaluation board


49Tools for MicroBlaze Design - TDP

Targeted Design PlatformsDevelopment boards with proven design examplesTargeted reference designs– Fully verified and supported reference designs – Infrastructure building blocks connected together– Immediately start designing

Start with a TDP, then customizeLook for the Avnet Spartan-6 LX16 Evaluation kit TDP


50Agenda




Getting Started


51Getting Started – See the Demos

Avnet– S6-LX16 board with CapSense, LCD, and USB

Cypress– PSoC 3 Development Kits

• Touch-sensing• Analog sensors• LCD

Xilinx– SP605 Targeted Design Platform

• Extendable MicroBlaze embedded processor plus processor sub-system implemented in Spartan-6


52Getting Started – Get Hardware

Avnet Spartan-6 LX16 Kit (www.em.avnet.com/spartan6lx-evl)

Cypress MiniProg3 (CY8CKIT-002 www.cypress.com/go/PSoC3)

Xilinx JTAG Cable for advanced debug– www.xilinx.com/products/devkits/HW-USB-II-G.htm


53Getting Started – Install the Tools

Avnet– AvProg utility for Spartan-6 LX16 Evaluation Kit– www.em.avnet.com/spartan6lx-evl

Xilinx – ISE Design Suite, WebPack Edition– EDK Evaluation– www.xilinx.com/ise

Cypress – PSoC Creator– PSoC Programmer– www.cypress.com/go/psoc3


54Getting Started – Create Your Own Design

Download Tutorials from the Avnet Design Resource Center– www.em.avnet.com/drc

Look for trainings from Avnet

Get one-on-one help from your local Avnet FAE


55Interfaces from the 20th Century

Transceiver

FPGA


56Interfaces of Yesterday – Multi-chip

FPGA

USB-UART Bridge

Touch-Sensing

Controller


57The Modern, Single Chip, Custom Solution

FPGA

UARTSPII2CGPIO

PSoC

USB


58Feedback

Are you interested in attending a workshop to learn more?

Which topics?

Thanks for coming!

Please Visit the Demo Area!

X-fest Attendee Site: http://em.avnet.com/xfsupport2010


60LCD Construction


61LCD Types- Based on Light Source

Transmissive Reflective Transflective


62PSoC 3 Drives Multiple LCDs at Once

Multiple LCDs, One PSoC– Plenty of commons, segments

and I/Os to drive multiple displays– Add more product functionality,

reduce even more BOM10 8

10 8

PSoC 3

PSoC Creator – Glucose Meter with (1) Segment and (1) Character LCD Display

FPGA


63PSoC 3/5 LCD PLUS Functionality

Pedometer

Light Meter

Glucose Meter

Blood Pressure Monitor

Instrumentation

Segment LCD

PrecisionAnalog

Capsense Capsense

Segment LCD

High Performance Digital

Segment LCD

PrecisionAnalog

Motor Control

Segment LCD

PrecisionAnalog

Capsense

Segment LCD

PrecisionAnalog

Capsense


64Custom LCDs Differentiate Products

Air Quality Monitor

Light Meter

Glucose Meter Blood Pressure Monitor MultiMeter

pH Meter

Coffee Maker Flow Transmitter Exercise Machines

Standardsegment

Customsegment


65PSoC UART to USB Block Diagram

Tx

Rx→

PSoC’s flexible GPIOs allow user to assign dedicatedRTS/CTS (Request to send/clear to send) pins for the purpose

of hardware handshaking and data flow control

RTS

CTS

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