Design Of Mixed Service Strategy Control System Based On FPGA

The continuous innovation and maturity of building automation has made building intelligence become a boom of development.The improvement of intelligence has provided conditions for the intelligent control of equipment.Therefore,it is important to adopt appropriate control strategies to control the intelligent building equipment or smart home equipment stably and reliably.Research topics.There are few researches on the control of equipment in related research at home and abroad,and there is a lack of flexibility in the control mode,the control object is often singular,and the access method is not diversified.Research and design from the following aspects:(1)The system has multiple access users,including RFID access control card,license plate recognition,fingerprint identification,security equipment,anti-theft device,mobile phone,computer,etc.,and RFID access control card,license plate recognition,fingerprint identification,security equipment,anti-theft equipment,etc.Local access users are less tolerant of service delays than remote access users such as mobile phones and computers.In order to serve the information packets of each user stably and reliably,and to make the delay time of the local access user service as short as possible,this paper proposes a prioritized hybrid service policy polling model.The information packets of the local access user is grouped into a central queue,and the information packets of the remote access user is grouped into a normal queue.The central queue is used as a high priority,and the normal queue is used as a low priority.The full service policy and the limited k(k=1)service policy are respectively used to distinguish the priority services.(2)Using the embedded Markov chain(Markov)and probabilistic parent function theory to mathematically deduct the proposed polling model,and obtain the mathematical formula of the average queue length and the average queue waiting time of the central queue and the normal queue information packets.The Matlab software tool is used to theoretically calculate and simulate the derived performance parameters,and compares it with the performance parameters of the polling model without prioritization,which shows the effectiveness of applying the polling control strategy.(3)According to the application requirements,based on the analysis of the function and performance characteristics of the control system,the control system scheme is designed,and through the comparative analysis,the FPGA with parallel processing capability is used as the core control processing device to design and implement the control system.Based on FPGA application Verilog HDL for circuit design,simulation verification on Altera's Quartus II development platform;hardware setup and system debugging on Altera's DE2 development board.Simulation experiments and hardware debugging results show that the expected design goals can be achieved.The system can not only order services for multiple access users,but also distinguish different services for central queues and normal queues.Moreover,different services for the central queue and the normal queue can be distinguished,so that the queue waiting service time of the central queue is much shorter than the queue waiting service time of the ordinary queue.In addition,the use of hierarchical,modular design ideas,easy to expand,can achieve intelligent control of more electronic and electrical equipment in intelligent buildings or smart homes.