DATA TRANSMISSION METHOD AND ELECTRONIC DEVICE

• US 20150127859A1
• Filed: 08/06/2014
• Published: 05/07/2015
• Est. Priority Date: 11/04/2013
• Status: Active Grant

• Current Assignee: AutoChips INC. (Navinfo Company Limited)
• Original Assignee: AutoChips INC. (Navinfo Company Limited)
• Inventors: WANG, Zhanyong
• Granted Patent: US 10,331,594 B2
• Time in Patent Office: Days
• US Class Current: 710/63
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 3/1271 Job submission at the printing node, e.g. creating a job from a data stored locally or remotely G06F3/1238 takes precedence
• CPC Class Codes: G06F 3/1462 with means for detecting differences between the image stored in the host and the images displayed on the remote displays

Abstract

A data transmission method and an electronic apparatus are disclosed. The data transmission method comprises: establishing transmission channels between the local endpoints and a plurality of remote endpoints, wherein at least one of the local endpoints corresponds to at least two of the remote endpoints and at least two transmission channels are established; and transmitting data by using the transmission channels in a time-slice manner between the local endpoints and the corresponding remote endpoints. The data transmission method and the electronic apparatus of the present disclosure can achieve data transmission between a USB host and a plurality of USB devices even when the number of remote endpoints included in the USB devices is greater than the number of local endpoints included in the USB host.

Claims

1. A data transmission method, used in a universal serial bus (USB) host having a plurality of local endpoints, the data transmission method comprising:

establishing transmission channels between the local endpoints and a plurality of remote endpoints, wherein at least one of the local endpoints corresponds to at least two of the remote endpoints and at least two transmission channels are established; and

transmitting data by using the established transmission channels in a time-slice manner between the local endpoints and the corresponding remote endpoints.

2. The data transmission method of claim 1, wherein the step of establishing transmission channels between the local endpoints and a plurality of remote endpoints comprises:

establishing mapping relationships between the local endpoints and the remote endpoints; and

establishing the transmission channels between the local endpoints and the remote endpoints according to the mapping relationships.

3. The data transmission method of claim 1, further comprising:

storing data of the remote endpoints that correspond to a same local endpoint into a data queue, wherein the data comprises a plurality of USB request blocks.

4. The data transmission method of claim 3, wherein the step of transmitting data by using the transmission channels in a time-slice manner between the local endpoints and the corresponding remote endpoints comprises:

obtaining the USB request blocks from the data queue on the principle of first-in first-out (FIFO);

loading a plurality of physical parameters corresponding to the local endpoints that transmit the USB request blocks;

transmitting the USB request blocks from the local endpoints to the corresponding remote endpoints via corresponding transmission channels;

determining whether transmission of the USB request blocks in the data queue is completed; and

if transmission of the USB request blocks in the data queue is not completed, continuing to execute the step of obtaining the USB request blocks from the data queue on the principle of first-in first-out (FIFO).

5. The data transmission method of claim 4, wherein the USB request blocks comprise a plurality of transactions, and the step of transmitting the USB request blocks from the local endpoints to the corresponding remote endpoints via corresponding transmission channels comprises:

transmitting token packets, data packets and handshake packets corresponding to the transactions included in the USB request blocks in sequence, wherein the data packets are transmitted according to data toggle bits corresponding to the transmission channels;

monitoring whether a transmission state flag bit corresponding to the transaction transmission indicates that the transmission is correct;

if the transmission state flag bit indicates that the transmission is correct, then further determining whether transmission of the plurality of transactions included in the USB request blocks is completed; and

if transmission of the plurality of transactions included in the USB request blocks is not completed, then continuing to execute the step of transmitting token packets, data packets and handshake packets corresponding to the transactions included in the USB request blocks in sequence.

6. The data transmission method of claim 5, wherein if the transmission state flag bit indicates a transmission error, performing error processing on the USB request blocks.

7. The data transmission method of claim 5, wherein once transmission of the plurality of transactions comprised in the USB request blocks is completed or the transmission state flag bit indicates a transmission error, unloading the plurality of physical parameters corresponding to the local endpoints that transmit the USB request blocks.

8. The data transmission method of claim 5, further comprising:

setting the data toggle bits corresponding to the transmission channels before transmitting the USB request blocks via the transmission channels;

wherein the data toggle bits corresponding to the transmission channels are adjusted when the transmission state flag bit indicates a transmission error.

9. The data transmission method of claim 5, further comprising:

backing up the data toggle bits corresponding to the transmission channels after transmission of a current USB request block is completed;

wherein the data toggle bits corresponding to the transmission channels are updated before the next USB request block is transmitted.

10. An electronic device, comprising a universal serial bus (USB) host having a plurality of local endpoints, the electronic device comprising:

a channel establishing module, configured to establish transmission channels between the local endpoints and a plurality of remote endpoints, wherein at least one of the local endpoints corresponds to at least two of the remote endpoints and at least two transmission channels are established; and

a data transmission module, configured to transmit data by using the transmission channels in a time-slice manner between the local endpoints and the corresponding remote endpoints.

11. The electronic device of claim 10, wherein the channel establishing module comprises:

a mapping relationship establishing unit, configured to establish mapping relationships between the local endpoints and the remote endpoints; and

a channel establishing unit, configured to establish the transmission channels between the local endpoints and the remote endpoints according to the mapping relationships established by the mapping relationship establishing unit.

12. The electronic device of claim 10, wherein the USB host further comprises:

a storage module, being configured to store data of the remote endpoints that correspond to a same local endpoint into a data queue, wherein the data comprises a plurality of USB request blocks.

13. The electronic device of claim 12, wherein the data transmission module comprises:

a data obtaining unit, configured to obtain the USB request blocks from the data queue stored in the storage module on the principle of first-in first-out (FIFO);

a parameter loading unit, configured to load a plurality of physical parameters corresponding to the local endpoints that transmit the USB request blocks, wherein the physical parameters include endpoint serial numbers of the remote endpoints corresponding to the USB request blocks;

a data transmission unit, configured to transmit the USB request blocks obtained by the data obtaining unit from the local endpoints to the corresponding remote endpoints via corresponding transmission channels after the parameter loading unit has loaded the physical parameters corresponding to the local endpoints; and

a determining unit, configured to determine whether transmission of the USB request blocks in the data queue is completed;

wherein if the determining unit determines that transmission of the USB request blocks in the data queue is not completed, the data obtaining unit obtains the USB request blocks from the data queue on the principle of first-in first-out (FIFO).

14. The electronic device of claim 13, wherein the USB request blocks include a plurality of transactions, and the data transmission unit further comprises:

a transaction transmission sub-unit, configured to transmit token packets, data packets and handshake packets corresponding to the transactions included in the USB request blocks in sequence, wherein the data packets are transmitted according to data toggle bits corresponding to the transmission channels;

a monitoring sub-unit, configured to monitor whether a transmission state flag bit corresponding to the transaction transmission indicates that the transmission is correct; and

a determining sub-unit, configured to determine whether transmission of the plurality of transactions included in the USB request blocks is completed if the transmission state flag bit indicates that the transmission is correct as monitored by the monitoring sub-unit;

wherein if the determining sub-unit determines that transmission of the plurality of transactions included in the USB request blocks is not completed, then the transaction transmitting sub-unit transmits, in sequence, token packets, data packets and handshake packets corresponding to the transactions included in the USB request blocks.

15. The electronic device of claim 14, wherein the data transmission unit further comprises:

an error processing sub-unit, configured to perform error processing on the USB request blocks if the transmission state flag bit indicates a transmission error as monitored by the monitoring sub-unit.

16. The electronic device of claim 14, wherein the data transmission unit further comprises:

a parameter unloading sub-unit, configured to unload the plurality of physical parameters corresponding to the local endpoints that transmit the USB request blocks if the determining unit determines that transmission of the plurality of transactions comprised in the USB request blocks is completed or, as monitored by the monitoring sub-unit, the transmission state flag bit indicates a transmission error.

17. The electronic device of claim 14, wherein the data transmission unit further comprises:

a data toggle bit setting sub-unit, configured to set the data toggle bits corresponding to the transmission channels established by the channel establishing module before transmitting the USB request blocks via the transmission channels; and

a data toggle bit adjusting sub-unit, configured to adjust the data toggle bits corresponding to the transmission channels if the transmission state flag bit indicates a transmission error as monitored by the monitoring sub-unit.

18. The electronic device of claim 14, wherein the data transmission unit further comprises:

a data toggle bit backup sub-unit, configured to back up the data toggle bits corresponding to the transmission channels after transmission of a current USB request block is completed by the data transmission unit; and

a data toggle bit updating sub-unit, configured to update the data toggle bits corresponding to the transmission channels before the next USB request block is transmitted by the data transmission unit.