Multi-serial port extension method based on FPGA and TL16C554A

Abstract

The present invention provides a multi-serial port extension method based on FPGA and TL16C554A. The method employs the following hardware: an FPGA, n TL16C554A chips, and n serial port level conversion chips. The FPGA is connected to a DSP via a data bus, an address bus and a control bus. The FPGA acts as an asynchronous memory of the DSP processor, and implements communication with the DSP, time sequence driving of the TL16C554A chip, chip selection decoding and interrupt decoding. The TL16C554A chip is a management unit of asynchronous serial communication, and comprises four serial port communication management units and is capable of converting parallel data into four paths of serial outputs, can implement transmission and reception management of the four serial ports, and can simultaneously achieve communication with 4n devices. The method according to the present invention is a multi-serial port extension method which occupies less processor address space and fewer interrupt resources, has a high reliability, and is simple to transplant.

Description

technical field [0001] The invention relates to a multi-serial port expansion method based on FPGA and TL16C554A. Background technique [0002] For systems with high real-time requirements for multi-sensor (often more than 4) data acquisition, since the number of serial ports of the processor is often less than 4, in order to realize the communication between the processor and multiple sensors through the serial port, it is necessary to expand the serial port of the processor . [0003] There are generally two ways to expand the serial port: the first is to use the software simulation method to expand the serial port, that is, in the programmable digital logic chip such as PLD, use the software to simulate the function of sending and receiving of the serial port to realize the serial port expansion. This method has the advantages of less resources occupied by the I / O port of the microprocessor and simple circuit design. However, the serial port logic is complex to simulate ...

AI Technical Summary

Problems solved by technology

This method only considers the logic of chip selection and interrupt, and does not consider the timing drive of the serial port expansion chip. Often the timing does not meet the requirements of the serial port expansion chip, resulting in the loss of serial port sending and receiving data, and the reliability of the extended serial port is not high.

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