基于FPGA的按键消抖动设计

Shaking Release Design on the Keys of FPGA

在研制测量仪表、电子仪器及电子设计的过程中,按键是常用器件,而按键的弹跳现象是数字系统设计中存在的客观问题.这就要求电路具有消抖措施,即对于由于机械弹跳产生的噪声信号经过消抖电路滤除,保证电路能够正确的响应.本文介绍了基于FPGA的两种消除按键抖动的方法,并给出了相应的VHDL代码以及仿真图形,从而解决了按键的机械抖动影响,保证电路稳定工作.

Keys were the common elements during the research of measure instrument, electronic apparatus, and design of the electronic. The bounce phenomenon of keys was the objective problem in the digital system design. Therefore, the shaking release measurement was necessary. That is to remove the noise signal at the engine bounce through the elimi- nating the shaking circuit in order to ensure the right response of the circuit. The paper introduced two methods of elim- inating shaking on FPGA and gave the relative VHDL code and the imitating picture. It resolved the influence of engine shaking on keys and ensurd the steady working of the circuit.