6.-Sistemas Basados en El Conocimiento

7/27/2019 6.-Sistemas Basados en El Conocimiento

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Universidad de HunucoSistemas Basados en el

Conocimiento

Instructor: Dr. Aland Bravo Vecorena


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Interfaces USB

USB

Creado por Intel en el ao 1994, versin 1.0.

En el ao 1998 se lanza la versin 1.1 con una velocidad de

transferencia baja de 1.5 Mbps y a full capacidad de 12 Mbps.

En el ao 2000, se lanza la versin 2.0 de alta capacidad con 480 Mbps.


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USB: Bus Serial Universal

Auto dteccin & configuraion (Plug&Play)

Energa en el Bus

3 velocidades: Low- 1.5 Mbps, Full- 12 Mbps,

High- 480 Megabits/second

RS232

Paralelo

PS/2

Tipos de

Aplicacin

Extend the functionality of

your computer!

Data Analysis,

Data Logging,

Firmware Updates,

Diagnostics,

Embedded Applications!


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Caractersticas del USB

NRZI Data Encoding

Half duplex data transmission can go in only one direction at a time

Bus Power to each device:

4.40 - 5.25 V

Guaranteed 100 mA

500 mA maximum through negotiation

~ 5.0 V

~ 3.3 V

VBUS

D+

D-

GND

VBUS

D+

D-

GND

4-wire

connection

Differential

Signaling


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mini-B Plug

FS, HS PeripheralB Plug

FS, HS Peripheral

A Plug

USB Host


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Guaranteed Latency Guaranteed Data

Integrity

Interrupt

Bulk

Isochronous

PIC18F4550 family supports all these transfer types.


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USB Pipes

HOST PC

Big USB Pipe12Mb/s

Small Pipe to each USBdevice (up to 127)

Tiny Pipes (endpoints)


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Client Software Function

Client

Software

Interface

USB Device

Host

Endpoints

Data Flows

Buffers

Pipes


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El Dispositivo Lgico

Device(Manufacturer: Microchip Technology)(Product: Mouse in a Circle Demo)

Configuration

Interface

IN (Endpoint 0)USB System Software

(default control pipes)

USB Device-Specific Pipe(s)

(Human Interface Device)

HID TX/RX Functions

(MCHPFSUSB FW)

Analog/Digital I/O

OUT (Endpoint 0)

IN (Endpoint x)

OUT (Endpoint x)

These settings arerepresented by aDevice DescriptorTable, stored infirmware.


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Trama USB

BULK

BULK

BULK

BULK

BULK

BULK

BULK

BULK

Tx

Voice

Tx

Line

Inte

rrupt,

Con

trol,

Low

Spe

ed

Trame = 1ms

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Stereo Audio

Rx

Voice

Rx

Line

Slot

SOF

Low Speed

Low Speed

BULK

BULK

Scanner


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Perifricos USB

11

Joystick

Mouse

SD CardReader

MCHP

RS-232

Data

LoggerUPS

Keyboar

d

Generic

Human Interface Device

Class (HID)

Mass Storage

Device Class (MSD)

Communication

Device Class (CDC)

Digitizer

WinUSBLibUSB

Custom Class(Vendor Class)

Audio

Class

MIDI

Speaker


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El Proceso de Enumeracin

DETACHED

POWEREDPower

(self/bus)

DEFAULT

Bus

reset

ADDRESS

Get Device

Descriptor

CONFIGURED

Get

Descriptors

ATTACHED

Cable

ConnectedSUSPENDED


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Auto Deteccin: Full Velocidad

+5V

D+

D-

GND

Transceiver

USB

Connector

Peripheral Device

VUSB 3.3 VFull Speed Identification

D+ line pull-up

1.5k5%

USB PICMCU


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Auto Deteccin: Baja Velocidad

+5V

D+

D-

GND

Transceiver

USBConnector

Peripheral Device

VUSB 3.3 VLow Speed Identification

D- line pull-up

1.5k5%

USB PICMCU


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On-chip Pull-up Resistors

+5V

D+

D-

GND

Transceiver

USB

Connector

Peripheral Device

VUSB 3.3 V

On-chip pull-up resistors

available!

USB PICMCU


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Address and Configuration: EP0

See Chapter 9 in USB 2.0 Spec for more info.

Other Endpoints

Endpoint 0 IN(Control Data)

Endpoint 0 OUT(Control Data)

Dual Port/Access RAM

Descriptors

Control Transfers

USB PICMCU


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Descriptores

Device

Configuration 1

Interface 0

Endpoint

Interface 1

Endpoint Endpoint Endpoint

To other Configurations if any

To other Interfaces

if any

String 0

String 1

String N

l Descriptors are typically stored in non-volatile/Flash memory


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Descriptors - Example

PICDEM USB

Microchip

Device

Configuration 1

Interface 0

Endpoint

Manu. String

Prod. String

USB 2.0, VID = 0x04D8,

PID = 0x0007, Num. Configurations,

Strings?

Configuration #1: Bus-Powered,Remote Wakeup, 500mA, Num.

Interfaces

Interface #0: HID Class, Num. Endpoints

Endpoint 1 IN, Interrupt Transfer Type,

64-byte buffer, Poll every 3 ms

UnicodeCharacters

Go USB!

Other String


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MCHPFSUSB Software Framework

- Device Descriptor Table -

usb_descriptors.cDescriptors

VID & PID

Class Specific/* Device Descriptor */ROM USB_DEVICE_DESCRIPTOR device_dsc={ 0x12, // Size of this descriptor in bytes

USB_DESCRIPTOR_DEVICE, // DEVICE descriptor type0x0200, // USB Spec Release Number

CDC_DEVICE, // Class Code0x00, // Subclass code0x00, // Protocol codeEP0_BUFF_SIZE, // Max packet size for EP0,0x04D8, // Microchip Vendor ID0x000C, // Product ID ID


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CDCRS-232 Emulation

PC ComputerPIC Microcontroller

USB Cable

Hyper TerminalCDC

INF File Required(Supplied in MCHPSUSB)

Standard Windows Drivers

Design Considerations: ~80 KB/s max

Bulk Transfers

PC applications can access the device as though it

is connected to a serial COM port


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Acerca del Curso

Presentacin en clase con PPT.

Laboratorio en Matlab, Proteus y MPLAB.

Proyectos de Investigacin:

SBC1: Espectro de Fourier de una Seal ECG. SBC2: Espectro Wavelet de una Seal ECG.

SBC3: Red Neuronal para Deteccin de Anomalas

Cardacas de una Seal ECG

SBC4: Deteccin de Segmento QRS de una Seal ECG.

Trabajos de Laboratorio:

Sistema de Anlisis ECG.

Sistema de Control de Motor Trifsico.

Estacin Meteorolgica.

Documents

6.-Sistemas Basados en El Conocimiento