Method for transmitting and processing command and data

• US 20050105518A1
• Filed: 11/08/2004
• Published: 05/19/2005
• Est. Priority Date: 11/14/2003
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hwang, Byung-Ho
• Granted Patent: US 7,571,374 B2
• Time in Patent Office: Days
• US Class Current: 370/373
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end

Abstract

Disclosed is a method in which a computer and a personal digital assistant easily and stably transmit commands and data through a serial interface and process them. To this end, the method for transmitting a command comprises: generating a command packet including a command frame, a length frame, a command data frame, an error check fame and an end character frame; and transmitting the command packet.

Claims

1. A method for transmitting a command comprising:

generating a command packet including a command frame, a length frame, a command data frame, an error check frame and an end character frame; and

transmitting the command packet.

2. The method of claim 1, wherein the generating of the command packet comprises:

generating a command packet comprising the command frame, the length frame and the command data frame;

generating the error check frame comprised in the generated command packet, for checking whether an error is generated at the generated command packet;

encoding the command packet having the error check frame; and

generating the end character frame included in the encoded command packet and indicating an end of the command packet.

3. The method of claim 1, wherein the error check frame is a CRC (Cyclic-Redundancy Check) frame.

4. A method for processing a command comprising:

receiving through a serial interface a command packet including a command frame, a length frame, a common data frame, an error check frame and an end character frame;

erasing the end character frame of the received command packet;

decoding the command packet where the end character frame has been erased; and

erasing the error check frame of the decoded command packet.

5. The method of claim 4, wherein the erasing of the end character frame comprises:

erasing the end character frame if the last byte of the command packet transmitted through the serial interface is the end character frame.

6. The method of claim 4, further comprising:

asking for retransmission of the command packet if the last byte of the command packet is not the end character frame.

7. The method of claim 4, wherein the erasing of the error check frame comprises:

checking the error check frame of the decoded command packet to check whether an error is generated at the decoded command packet, and erasing the error check frame if an error is not generated at the decoded command packet.

8. The method of claim 7, further comprising:

asking for retransmission of the command packet if an error is generated at the decoded command packet.

9. The method of claim 7, further comprising:

asking for retransmission of the command packet through Non-Acknowledgement (NAK) if an error is generated at the decoded command packet.

20. The method of claim 9, further comprising:

asking for retransmission of the data packet if the first frame of the data packet is not a synchronous frame, if the packet number of the data packet is not the same as the packet number of the data packet to be received, or if an error is generated at the data packet.

10. A method for transmitting data comprising:

generating a data packet including a synchronous frame, a packet number frame, a data frame and an error check frame; and

transmitting the data packet.

11. The method of claim 10, wherein the generating of the data packet comprises:

generating a data packet comprising the synchronous frame, the packet number frame and the data frame; and

generating the error check frame included in the generated data packet, for checking whether an error is generated at the generated data packet.

12. The method of claim 11, wherein the error check frame is a parity frame.

13. A method for processing data comprising:

receiving through a serial interface a data packet including a synchronous frame, a packet number frame, a data frame and an error check frame; and

erasing the error check frame of the data packet if the first frame of the data packet is the synchronous frame and a packet number of the data packet is the same as a packet number of a data packet to be received.

14. The method of claim 13, wherein the erasing of the error check frame comprises:

erasing the error check frame if an error is not generated at the data packet.

15. The method of claim 13, further comprising:

asking for retransmission of the data packet if the first frame of the data packet is not the synchronous frame or if the packet number of the received data packet is not the same as the packet number of the data packet to be received.

16. The method of claim 13, further comprising:

asking for retransmission of the data packet if an error is generated at the data packet.

17. A method for transmitting commands and data, in which a personal digital assistant and a computer transmit commands and data to each other through a serial interface, comprising:

transmitting a command packet including a command frame, a length frame, a command data frame, a CRC (Cyclic-Redundancy Check) frame and an end character frame; and

transmitting a data packet including a synchronous frame, a packet number frame, a data frame and a parity frame.

18. A method for processing a command, in which a command packet received through a serial interface is processed, comprising:

receiving through the serial interface a command packet including a command frame, a length frame, a command data frame, a CRC (Cyclic-Redundancy Check) frame and an end character frame;

erasing the end character frame if the last byte of the command packet received through the serial interface is the end character frame;

asking for retransmission of the command packet if the last byte of the command packet is not the end character frame;

decoding the command packet where the end character frame has been erased;

erasing the CRC frame if an error is not generated at the decoded command packet after checking the CRC frame of the decoded command packet; and

asking for retransmission of the command packet if an error is generated at the decoded command packet after checking the CRC frame of the decoded command packet.

19. A method for processing data, in which a data packet received through a serial interface is processed, comprising:

receiving a data packet including a synchronous frame, a packet number frame, a data frame and a parity frame;

verifying that the first frame of the data packet is a synchronous frame;

checking whether a packet number of the data packet is the same as a packet number of a data packet to be received if the first frame of the data packet is the synchronous frame; and

erasing the parity frame if the packet number of the received data packet is the same as the packet number of the data packet to be received and an error is not generated at the data packet after checking the parity frame of the data packet.