CA2575360A1 - Method and apparatus for sending data between usb clients - Google Patents

Method and apparatus for sending data between usb clients Download PDF

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Publication number
CA2575360A1
CA2575360A1 CA002575360A CA2575360A CA2575360A1 CA 2575360 A1 CA2575360 A1 CA 2575360A1 CA 002575360 A CA002575360 A CA 002575360A CA 2575360 A CA2575360 A CA 2575360A CA 2575360 A1 CA2575360 A1 CA 2575360A1
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CA
Canada
Prior art keywords
usb
client apparatus
usb client
interpreting
toggles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002575360A
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French (fr)
Other versions
CA2575360C (en
Inventor
Vahid Moosavi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Research in Motion Ltd filed Critical Research in Motion Ltd
Publication of CA2575360A1 publication Critical patent/CA2575360A1/en
Application granted granted Critical
Publication of CA2575360C publication Critical patent/CA2575360C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4247—Bus transfer protocol, e.g. handshake; Synchronisation on a daisy chain bus
    • G06F13/426—Bus transfer protocol, e.g. handshake; Synchronisation on a daisy chain bus using an embedded synchronisation, e.g. Firewire bus, Fibre Channel bus, SSA bus

Abstract

A method and apparatus for transferring data from a first electronic device to a second electronic device, both first and second electronic devices having Universal Serial Bus (USB) client interfaces, the method comprising the steps: connecting the two electronic devices with a USB cable; toggling the voltage on a V BUS line of the USB
cable between logic high voltage and no voltage at the first electronic device; detecting toggles of the V BUS line at the second electronic device; and interpreting the toggles detected in the detecting step as data.

Claims (20)

1. A method for transferring data from a first electronic device to a second electronic device, both first and second electronic devices having Universal Serial Bus "USB" client interfaces, the method comprising the steps:
connecting the two electronic devices with a USB cable;
toggling the voltage on a V BUS line of the USB cable between logic high voltage and no voltage at the first electronic device;
detecting toggles of the V BUS line at the second electronic device; and interpreting the toggles detected in said detecting step as data.
2. The method of claim 1, wherein said interpreting step counts the number of toggles.
3. The method of claim 1, wherein said interpreting step counts the number of toggles in a predetermined time period.
4. The method of claim 1, wherein said interpreting step recognizes bits by understanding a high voltage to represent a binary one and no voltage to represent a binary zero in a specific time slot.
5. The method of any one of claims 1 to 4, wherein said detecting step comprises:
triggering an interrupt when a toggle occurs; and incrementing a counter upon said triggering.
6. The method of any one of claims 1 to 5, further comprising a handshaking routine to indicate a start of data transmission.
7. The method of any one of claims 1 to 6, wherein the V BUS line is toggled at a rate of four toggles per second or greater.
8. The method of any one of claims 1 to 7, wherein the amount of data being transferred is 512 bits or less.
9. A USB client apparatus adapted to communicate with a second USB client apparatus, the USB client apparatus comprising:
a USB port; and means for toggling a V BUS line on said USB port for encoding data to be communicated to the second USB client apparatus.
10. The USB client apparatus of claim 9, wherein the means for toggling is a software module adapted to interact with a USB interface for said USB port.
11. The USB client apparatus of one of claim 9 or claim 10, wherein said apparatus is a mobile data device.
12. The USB client apparatus of one of claim 9 or claim 10, wherein said apparatus is a peripheral for a mobile data device.
13. The USB client apparatus of claim 12, wherein said apparatus is a Bluetooth smart card reader.
14. A USB client apparatus adapted to communicate with a second USB client apparatus, the USB client apparatus comprising:
a USB port;
means for detecting toggling of a V BUS line on said USB port; and means for interpreting said toggling into data content.
15. The USB client apparatus of claim 14, wherein said means for interpreting is adapted to count the number of toggles.
16. The USB client apparatus of claim 14, wherein means for interpreting is adapted to count the number of toggles in a predetermined time period.
17. The USB client apparatus of claim 14, wherein said means for interpreting is adapted to recognize bits by understanding a high voltage to represent a binary one and no voltage to represent a binary zero in a specific time slot.
18. The USB client apparatus of any one of claims 14 to 17, wherein said means for detecting comprises:
means for triggering an interrupt when a toggle occurs; and means for incrementing a counter upon said triggering.
19. The USB client apparatus of any one of claims 14 to 18, further comprising a module adapted for handshaking with the second USB client apparatus at a start of data transmission.
20. The USB client apparatus of any one of claims 14 to 19, wherein the apparatus is a mobile data device.
CA2575360A 2006-01-30 2007-01-25 Method and apparatus for sending data between usb clients Active CA2575360C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/341,661 US7882288B2 (en) 2006-01-30 2006-01-30 Method and apparatus for transfering data between USB client devices by toggling a USB VBUS line
EP06101047.6 2006-01-30
EP06101047A EP1816571B1 (en) 2006-01-30 2006-01-30 Method and apparatus for sending data between USB clients

Publications (2)

Publication Number Publication Date
CA2575360A1 true CA2575360A1 (en) 2007-07-30
CA2575360C CA2575360C (en) 2011-07-26

Family

ID=42732725

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2575360A Active CA2575360C (en) 2006-01-30 2007-01-25 Method and apparatus for sending data between usb clients

Country Status (5)

Country Link
US (2) US7882288B2 (en)
EP (1) EP1816571B1 (en)
AT (1) ATE403188T1 (en)
CA (1) CA2575360C (en)
DE (1) DE602006002022D1 (en)

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Also Published As

Publication number Publication date
US8135892B2 (en) 2012-03-13
US20110106988A1 (en) 2011-05-05
EP1816571B1 (en) 2008-07-30
DE602006002022D1 (en) 2008-09-11
ATE403188T1 (en) 2008-08-15
EP1816571A1 (en) 2007-08-08
CA2575360C (en) 2011-07-26
US20070180174A1 (en) 2007-08-02
US7882288B2 (en) 2011-02-01

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