7-1 Lecture 7 Agenda Isochronous Transfers Using HID with Visual BASIC Resources Demo USB Diagnostic Tools USBCheck HIDCheck USB 2.0

7-1

Lecture 7 Agenda

Isochronous TransfersUsing HID with Visual BASIC Resources Demo

USB Diagnostic Tools USBCheck HIDCheck

USB 2.0

7-2

Isochronous Transfers

7-3

Isochronous Transfers (1 of 3)

OUTnDATA Register

USBOUTData

USBIN

Data

8051 FIFO

USB FIFO

8051 FIFO

USB FIFO

INnDATA Register

SOF

SOF(n=8-15)

(n=8-15)

7-4

TRM Chapter 8 Set the ISO endpoint valid bits

INISOVAL (0x7FE0), OUTISOVAL (0x7FE1) Set up the FIFO sizes

Use OUTnADDR registers These set the starting addresses for the ISO FIFOS Size is allocated in increments of 16 bytes All ISO endpoints share 1024 bytes of FIFO memory Start address (SA) register format:

A9 A8 A7 A6 A5 A4 0 0 (0 0) Example1: EP8IN=512, EP8OUT=512

IN8ADDR = 0 OUT8ADDR = 512 = 1000000000, SA=10000000=0x80


7-5

ISO data available as FIFO, not RAM 16 FIFO data registers:

OUT8DATA, OUT9DATA, ... OUT15DATAIN8DATA, IN9DATA, ... IN15DATA

One USB interrupt for all ISO endpoints SOF, every millisecond

SOF_ISR should read/write ISO fifo data Set DPTR to the endpoint, then execute

multiple ‘movx’ instructions Don’t need to increment DPTR each access

Example code on TRM page 8-8 (Fig 8-6)


7-6

Using HID with Visual BASIC

7-7

Read Axelson Chapter 16 “Human Interface Devices: Host Application Example Shows code for both VB and VC++

First edition of the book had a CD, Second edition does not Go to lvr.com, download ‘usbhidio’

Unpack it VisualBasic folder has VB Project (usbhidio.vbp)

In project ‘Modules’ folder: ApiDeclarations.bas Contains VB declarations to allow VB to make C-style API

calls VB application code in ‘frmMain.frm’ Change VID and PID values to 0547/7450:

'Set these to match the values in the device's firmware and INF file.Const MyVendorID = &H547Const MyProductID = &H7450

VB-HID Development Stepshost side

7-8

Keil project: gpHID.uv2 fw2HID.c (from last session) gpHID_descriptors.a51

INT-IN and INT-OUT endpoints Report descriptor specifies 2-byte in and out reports

Compile and load the code Start the debugger

First time: you’ll see the “HID Device Found” box Readout should start incrementing

VB-HID Development Stepsdevice side

7-9

Run the VB code It should find the device Then Allows you to send two-byte out reports

First byte is readout increment rate Second byte is decimal point

Shows the results of two-byte input reports First byte is current digit Second byte is pushbutton states

VB-HID Development Stepsboth sides

7-10

My Customizationbased on Jan’s code

7-11

A VB HID Test Control PanelClick

7-12

Sending an OUTPUT ReportThe PC Side

SendBuffer(0) = 0 ‘ The first byte is the Report ID

SendBuffer(1) = 31 - hsRate.Value ' next 2 bytes are data--rate

SendBuffer(2) = dp ' decimal point

NumberOfBytesWritten = 0

Result = WriteFile _

(HidDevice, _

SendBuffer(0), _

CLng(Capabilities.OutputReportByteLength), _

NumberOfBytesWritten, _

0)

7-13

Sending an OUTPUT ReportThe Peripheral Side

if(!(OUT1CS & bmEPBUSY)) // Is there something available?

{

timeconst = OUT1BUF[0]*20; // Output Report Byte 0 is time // const (tenths of sec)

dp = OUT1BUF[1]; // decimal point

OUT1BC = 0; // Re-arm EP1-OUT

IN1BUF[0] = count;

IN1BUF[1] = buttons;

IN1BC = 2; // arm the EP2-IN transfer

}

7-14

Reading an INPUT ReportThe PC Side

Result = ReadFile _

(HidDevice, _

ReadBuffer(0), _

CLng(Capabilities.InputReportByteLength), _

NumberOfBytesRead, _

0)

tb7SEG = Hex$(ReadBuffer(1)) ' put first byte value into text box (7-seg value)

readval = ReadBuffer(2) ' get button states

7-15

Reading an INPUT ReportThe Peripheral Side

if(!(OUT1CS & bmEPBUSY)) // Is there something available?

{

timeconst = OUT1BUF[0]*20; // Output Report Byte 0 is time // const (tenths of sec)

dp = OUT1BUF[1]; // decimal point

OUT1BC = 0; // Re-arm EP1-OUT

IN1BUF[0] = count;

IN1BUF[1] = buttons;

IN1BC = 2; // arm the EP2-IN transfer

}

7-16

USB Diagnostic Tools

7-17

USB Diagnostic Tools

USBCheck Tests for Chapter 9 Compliance Tricky to use

HIDView Tests HID devices Tricky to use

7-18

USBCheck Versions

OSUSBCheck

VersionUSBDiag.sys

VersionController

Win98 Gold 2.9 4.10.1706 UHCI

Win98 SE 3.2 5.00.1868.1 UHCI

Win98 SE 3.2 5.10.1868.1 OHCI

7-19

USBCheckOrder is critical

Start USBCheck

Start up your ReNumerating 8051 code

Exit program, then physically disconnect your device

7-20

USBCheck

Don’t start HIDView from here. Instead, quit USBCheck, unplug your device, then launch HIDView as a separate program.

7-21

HIDView

7-22

HIDViewReady to roll

7-23

USB 2.0

7-24

USB 2.0 in a Nutshell Runs 40X faster than USB 1.1

Low speed: 1.5Mb/s Full speed: 12Mb/s High speed: 480Mb/s

Fully supports existing USB devices Forward compatible—plug existing 1.1 devices

into new 2.0 hosts Backward compatible—plug new 2.0 devices

into existing 1.1 hosts Uses the same cables as USB 1.1

7-25

USB 2.0 Hub Magic

PCUSB 2.0 USB 2.0

1.1 HubUSB USB USB USB

FSDevice

FSDevice

12 MBits/sec shared between

devices

2.0 HubUSB USB USB USB

FSDevice

FSDevice

12 MBits/sec per device

HSDevice

7-26

USB 2.0 Specification

Revision 2.0, April 27, 2000 622 pages Full spec available at:

www.usb.org/developers/docs.html

7-27

Cable Magic USB 1.1

D+ / D–

45

45

3.3V

7-28

Cable Magic USB 2.0

D+ / D–

17 ma

400 mV

45

45

7-29

SOF

327

SOF

328

1 msec

ISO (~1000)

BU

LK

(64

)

USB 1.1 BandwidthC

TL

(64

)

7-30

SOF

327

SOF

328

USB 2.0 Bandwidth

SOF

327

SOF

327

SOF

327

SOF

327

SOF

327

SOF

327

SOF

327

125 usec

125 usec

125 usec

125 usec

125 usec

125 usec

125 usec

125 usec

1 msec

SOF

327

SOF

327

1024

SOF

327

SOF

327

512

641024 1024 512 512 ISOINT

BU

LK512 512 512 512 512 512 512 512 512 512 512

CT

L

64

7-31

Packet Sizes

Control

Bulk

Interrupt

Isochronous

8, 16, 32, 64

8, 16, 32, 64

1–64

1023

64

512

1024

1024

USB 1.1 USB 2.0

Transfer Type Packet Size

7-32

USB 2.013 Bulk packets per microframe max13 * 512 * 8 * 1000 = 53 MB/s

Bandwidth Example:ATA Hard Drive

7200 RPM, 512 Kbyte Internal Buffer

Internal data transfer rate: 40MB/s Avg. sustained transfer rate: 15 MB/s Channel rate: 66.6MB/s

7-33

USBHost

Buffer

Head

40

Disk Drive

USB 2.0Controller

USB 6020–50 IF

15 Sustained

Bandwidth Analysis: USB Hard Drive

7-34

Bandwidth Conclusions

Both sides, USB and Interface, must support high bandwidth

USB Large endpoint buffers At least double buffering

Interface Internal processor should not touch 480 Mbit/sec

data. Use the CPU for USB housekeeping & I/O. Optimize the data channel using specialized logic.

Fast data transfers require fast control logic. Interface logic should be programmable ATA, EPP, etc.

7-35

16Low level protocolLow level protocolCRC, PID encode-CRC, PID encode-

decode, chirp decode, chirp Deliver WORDS Deliver WORDS

TokenTokenProcessorProcessorEP0, Ping,EP0, Ping, ACK/NAK/ ACK/NAK/

STALL/STALL/NYETNYET

"Chapter 9""Chapter 9"

Outside InterfaceOutside Interface

High speed logicHigh speed logicclock extractionclock extraction

serialize/serialize/ deserialize deserialize

bit stuffbit stuffNRZINRZI

SYNC,SYNC,EOPEOP

16

16 EndpointsEndpointsEndpoint FIFOSEndpoint FIFOS& control logic& control logic

16

CPUCPU48 MHz48 MHz 8051 8051

Program & Program & Data RAMData RAM

Dow

nloa

d C

ode

Dow

nloa

d C

ode

Dat

a C

han

nel

GPIF

Single-Chip Solution

7-36

USB BW: Endpoint Buffers

512512

512512

512512

512512

EP2

EP4

512512

512512

512512

512512

EP2

512512

512512

512512

512512EP6

EP8

512512

512512

512512

512512

EP6

512512

512512

512512

512512

EP2

512512

512512EP6

10241024

10241024

EP2

10241024

10241024

EP6

10241024

10241024

EP2

10241024

10241024

10241024

EP2

10241024

10241024

512512

512512EP8

EP0 IN&OUTEP0 IN&OUTEP1 INEP1 IN

EP1 OUTEP1 OUT 646464646464

646464646464

646464646464

646464646464

646464646464

646464646464

512512

512512EP8

7-37

Endpoint

FIFOSMicroprocessorUSB

OutsideWorld

(a) Low to Medium Speed

Data Transfer Speed Evolution

7-38


Endpoint

FIFOS

InterfaceFIFODMAUSB

OutsideWorld

(b) Faster

Microprocessor

RAM/FIFO

7-39


Endpoint

FIFOSUSB

OutsideWorld

(c) Fastest

Microprocessor

RAM/FIFO

7-40

Making the High Bandwidth Data Available to the Outside World

Don’t let the CPU be a bottleneck Use fast logic to do the transfers

Some type of DMA is essential Even better--”Zero time” DMA

transfers with programmable control signals

GPIF = General-Purpose Interface

7-41

Quantum FIFO

256x16

256x16

256x16

256x16

USB

256x16

I/O

256x16

256x16

256x16

1 clock

7-42

Quantum FIFO

256x16

256x16

256x16

USB

256x16

I/O

256x16

256x16

256x16

256x16

7-43

Quantum FIFO

256x16

256x16

256x16

USB

256x16

I/O

256x16

256x16

256x16

1 clock

256x16

7-44

Quantum FIFO

256x16

256x16

256x16

USB

256x16

I/O

256x16

256x16

256x16

256x16

7-45

Quantum FIFO

256x16

256x16

256x16

USB

256x16

I/O

256x16

256x16

256x16

256x16

8051

Documents

7-1 Lecture 7 Agenda Isochronous Transfers Using HID with Visual BASIC Resources Demo USB Diagnostic Tools USBCheck HIDCheck USB 2.0