Communication circuit and communication method of shared serial port

Abstract

The invention discloses a communication circuit and a communication method for sharing a serial port. A plurality of service serial interface modules are connected and communicated with the serial port of an upper computer through a public serial interface module; the service serial interface module is provided with a data path signal switch, a control signal regeneration circuit and an arbitration circuit; an upper computer serial port sends a control coding signal containing an address and control information to a service serial interface module through an RTS signal, and an arbitration circuit in the service serial interface module decodes the received control coding signal and matches the decoded control coding signal with a configured unique serial port address. And determining states of a data path signal switch and a control signal regeneration circuit in the module according to a matching result, and further determining a communication state of a serial port corresponding to the module and an upper computer. Transparent communication between the upper computer and a plurality of serial ports can be realized, participation of an arbitration board is not needed any more, wiring between board cards is simple, and reliability is improved.

Description

technical field [0001] The invention relates to a communication circuit and a communication method for sharing a serial port, belonging to the technical field of electronic circuits. Background technique [0002] The serial port is often used as a motherboard debugging interface because it is easy to use and takes up less resources. The most basic hardware debugging and diagnosis of the motherboard can be performed through the serial port. With the development of technology, some smart electronic devices are developing in the direction of multiple motherboards. Each motherboard is independent of each other and realizes different business functions. However, due to various reasons such as structural design, many smart devices generally only reserve one serial port for communication. PC communication. [0003] In order to realize the communication between the upper computer and all the serial ports of the motherboard on the smart device, multiple serial ports need to share an...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a communication circuit and a communication method for sharing a serial port, so as to solve the problem of complex connection when there are a large number of business main boards under the existing method, and secondly, the system reliability is reduced due to the introduction of the arbitration board and due to the control message There is a defect that the host computer cannot communicate completely transparently with the target board

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