FPGA的自动售货机控制系统方案毕业论文.docxVIP

基于FPGA的自动售货机控制系统设计摘要本毕业设计是在Altera公司EP1C3T144C8型FPGA为核心的LP-2900开发装置上通过原理图以及VHDL语言分别实现自动售货机控制系统的设计和仿真。其中，基于原理图的设计方案主要通过计数器、加法器、数值比较器在逻辑上实现自动售货机的控制。对于VHDL语言方案，主要通过各类选择语句以及条件判断语句实现自动售货机控制系统。两个设计都可以归于各个模块的设计和组合，主要分为投币模块，找零模块，显示模块和分频模块。各个模块之间通过各个信号相互连接并相互决定启动顺序。该售货机控制系统能够识别三种硬币，并且提供四种价格不同的货物供选择，七段数码管显示投入硬币的总额和购买之后以及找零过程中的余额，并且在退币过程中有LED以及蜂鸣器的提示，自动售货机系统还具备了取消购买的功能，一旦执行则直接开始退币。基于FPGA的自动售货机设计，具有开发周期短、硬件运行速度快、成本较低以及稳定性较高等优势。关键词：自动售货机，VHDL，原理图，FPGA，LP—2900THE DESIGN OF VENDING MACHINE CONTROL SYSTEM BASED ON FPGAABSTRACTA vending machine control system has been designed use schematics and VHDL language in this work. The system has also been simulated on LP-2900 development platform based on EP1C3T144C8 FPGA of Altera. Schematics design was used for the control logic of the vending machine by counters, adds and value comparators. While the VHDL language was applicated by its flexible selection and condional instructions. The two methods were both designed and assembled by modules, including coin inserter, money changer, display, and frenquency devider. Every module could communicate with and call for others by signals. The vending machine control system is capable of 3 different coins and 4 merchandises in different price. Total coins inserted and balance are shown on the 7-seg LED display, and a LED and a buzzer would be warned when changing back coins. The system is also able to cancle the purchasing by giving back all the coins as soon as requested. The vending machine based on FPGA has certain advantages in shorter development period, higher speed software running, lower cost, and more stable performence.Key words: Vending machines, VHDL, schematic diagram, FPGA, LP-2900目录1绪论11.1引言11.2EDA技术的产生、发展和展望11.3EDA工程的设计流程21.4FPGA简介21.5VHDL语言介绍32设计要求以及设计思路流程图42.1设计要求42.2总体设计思路简要概括42.2.1投币模块42.2.2商品选择模块52.2.3找零模块52.2.4显示模块52.2.5分频模块52.3总体设计流程图63基于原理图的设计实现过程73.1投币模块主要设计部分73.2商品选择模块的主要设计部分83.3找零模块的主要设计部分103.4显示模块的主要设计部分123.5分频模块的主要设计部分134基于VHDL的设计实现过程144.1输入输出口的定义144.2信号量的定义154.3分频模块进程1