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Method, device and system for extending universal asynchronous serial interface

An asynchronous serial interface and serial interface technology, applied in the field of data communication, can solve problems such as limitations, inability to apply circuits, increase circuit complexity, etc., to achieve the effect of simple implementation and cost reduction

Active Publication Date: 2012-02-22
BEIJING ZHIGU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the devices at both ends of the master serial port must support address decoding, otherwise this circuit cannot be applied, which has serious limitations; in addition, the address decoding circuit also increases the complexity of the circuit

Method used

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  • Method, device and system for extending universal asynchronous serial interface
  • Method, device and system for extending universal asynchronous serial interface
  • Method, device and system for extending universal asynchronous serial interface

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Embodiment Construction

[0058] The present invention provides an extended universal asynchronous serial interface method, device and system. The present invention will be described in detail below in conjunction with the accompanying drawings.

[0059] Figure 5 A schematic diagram of Embodiment 1 of an extended universal asynchronous serial interface receiving method of the present invention is given, and the method includes:

[0060] Step S1, receiving data from the central processing unit CPU from the first asynchronous serial interface;

[0061] Step S2, judge whether the first bit (abbreviation bit1) of each data byte in the data is 0 or 1, if the first bit is 0 then perform step S3, if the first bit is 1 then perform step S4;

[0062] Step S3, sending the data byte from the second asynchronous serial interface to the first interface device;

[0063] Step S4, sending the data byte from the third asynchronous serial interface to the second interface device.

[0064] The first asynchronous seri...

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Abstract

The invention provides a method, device and system for extending the universal asynchronous serial interface. The invention distinguishes the data of two universal asynchronous serial expansion interfaces by setting the first bit of the data byte, which can significantly reduce the cost and does not occupy other bus resources.

Description

technical field [0001] The invention relates to an extended universal asynchronous serial interface method, device and system, belonging to the technical field of data communication. Background technique [0002] A Universal Asynchronous Receiver / Transmitter (UART for short) can realize duplex communication at a lower rate between two devices. [0003] At present, UART is the most widely used serial interface in personal computer (PC for short) and electronic communication. It can be used for communication between the backplane and the interface card, and also for communication between the PC and the system board. [0004] The UART interface has only 3 signal lines, such as figure 1 As shown, the device A sends data to the peer device B through the transmission data line TXD, and receives the data from the peer device B through the reception signal line RXD, and the ground signal GND is a common ground signal for signal reference. [0005] For data synchronization, devices...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/42
Inventor 党磊
Owner BEIJING ZHIGU TECH SERVICE