Asynchronous serial communication control device

Abstract

The present invention discloses an asynchronous serial communication controller, which includes over three asynchronous serial communication controller internal control logics, a sending port, a receiving port, a sending objective register and a receiving source register, which correspond with each asynchronous serial controller, and a main controller. The main controller processes the information frames, which are received from each asynchronous serial port, judges whether the information frame type is instruction frame or data frame and processes the information correspondingly. If the information frame is an instruction frame, the main controller operates on a relative register according to the contents of the instruction frame. If the information frame is a data frame, the main controller sends the data frame contents at a set data format and rate from the set serial port according to contents of relative registers. The present invention has the following advantages that the present invention supports several asynchronous serial interfaces to communicate directly and mutually at a high speed, improves system efficiency and is easy to use.

Description

[0001] Field [0002] The invention relates to the communication field, in particular to the serial communication field in the communication field. Background technique [0003] At present, many electronic systems need to use asynchronous serial communication for communication. When the same device (or module, system) needs more serial ports, the following methods are generally used: [0004] 1. Use a general-purpose control device that itself has multiple asynchronous serial communication interfaces. Such a general control device is generally designed with 2 to 3 asynchronous serial communication interfaces. The number of serial ports that can be obtained by this method is still limited. [0005] 2. Use the software method to use the general input and output ports of the general control device to simulate the timing and communication format of the asynchronous serial port to expand. The number of serial ports and the communication rate that can be expanded by this method a...

AI Technical Summary

Problems solved by technology

Using this method is technically complex, takes up a lot of system resources, and costs a lot

Direct communication between devices connected to this type of device cannot be achieved using this method

[0007] 4. Use the serial port to expand multi-serial port devices. The representative devices are GM812X series and SP233X series serial port expansion chips. This method is used because an additional IO port is used as the address line of the multi-channel sub-serial port. After receiving each frame of data It is necessary to immediately read the address line of the sub-serial port to determine the source of the data or determine the destination of the data (otherwise the data may be lost), resulting in the data buffer queue of the device’s own master serial port and the data buffer queue of the serial port connected to the master serial port. It loses its proper function and the processing time increases, so high-speed data transmission cannot be realized

Direct communication between devices connected to this type of device cannot be achieved using this method

[0008] When multiple systems need to use asynchronous serial ports for interconnection, one system must be used as the main control system, and other systems send information to the main control system, and the information is transferred and distributed through the main control system, which increases the intermediate processing links and reduces efficiency

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