FPGA-based enhanced serial port

Abstract

The invention discloses an FPGA-based enhanced serial port and working method thereof. The FPGA (Field Programmable Gate Array) is taken as hardware, and the serial port is constructed in the FPGA by using an HDL language; the Baud rate, check mode, data length and the like of the serial port are conveniently and quickly configured by an external program, and the serial port automatically receives and sends data; the size of a cache for transceiving the data only depends on the scale of the FPGA; and a plurality of serial ports can be generated by multiplexing through simple operation, and the processing time and hardware resource of a main program are not occupied. For the main program, it is similar to operation on an external storage, so the main program is freed from the frequently interruption or query operation, the running efficiency of the main program is improved, the stability of the system is improved and the transplantability and the expandability of software are improved.

Description

technical field [0001] The invention relates to an enhanced serial port built on the basis of FPGA and a working method thereof. The FPGA is used as the hardware basis and Verilog HDL is used to write codes to realize. Background technique [0002] During RS232 communication, the data is in units of bytes. When receiving data, the hardware serial port integrated in the microcontroller, DSP, etc. has the function of setting the corresponding flag after receiving one (or more) bytes. When the data volume is large Sometimes, the main program needs to frequently perform interrupt response or flag bit query operations, control the receiving process and cache the received data, which will take up the time of the main program and spend hardware resources for process control; when sending data, it is necessary to query the current serial port Status, to control the sending process, which will also occupy its own resources and processing time. Contents of the invention [0003] Th...

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Problems solved by technology

[0002] During RS232 communication, the data is in units of bytes. When receiving data, the hardware serial port integrated in the microcontroller, DSP, etc. has the function of setting the corresponding flag after receiving one (or more) bytes. When the data volume is large Sometimes, the main program needs to frequently perform interrupt response or flag bit query operations, control the receiving process and cache the received data, which will take up the time of the main program and spend hardware resources for process control; when sending data, it is necessary to query the current serial port state, to control the sending process, which will also occupy its own resources and processing time

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