基于STM32方波信号测试仪设计.docx

摘要 Ⅳ Ⅰ 摘要 方波是一种非正弦曲线的波形，理想方波只有“高”和“低”这两个值。电流或电压的波形为矩形的信号即为矩形波信号，高电平在一个波形周期内占有的时间比值称为占空比，占空比为50%的矩形波称之为方波。通过STM32通用定时器TM2输入捕获管脚PA2捕获从PA6管脚产生的PWM波，而PWM波由STM32通用定时器TM3通道CH1产生，然后再由1602输出显示频率和占空比。 关键字：输入捕获，PWM频率，捕获算法，复用推挽输出ABSTRACT ABSTRACT Ⅱ Ⅱ ABSTRACT Square wave is a kind of non sinusoidal waveforms, ideal square wave only high and low these two values. Current or voltage waveform for rectangular signal is the rectangular wave signal, high level ratio in possession of a waveform cycle time is called duty cycle, duty ratio for 50% of the rectangular wave is called a square wave. Through the STM32 general timer TM2 input capture pin PA2 capture from PA6 tube feet to produce PWM wave, and PWM wave generated by the STM32 general timer TM3 channel CH1, then by 1602 output shows the frequency and duty ratio. Keywords: input capture，The PWM frequency,Capture algorithm,Reuse push-pull output目 录 目录 Ⅳ Ⅲ 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc449090751 第1章引言  PAGEREF _Toc449090751 \h 1  HYPERLINK \l _Toc449090752 1.1选题背景  PAGEREF _Toc449090752 \h 1  HYPERLINK \l _Toc449090753 1.2目标和意义  PAGEREF _Toc449090753 \h 1  HYPERLINK \l _Toc449090754 1.3实现思路  PAGEREF _Toc449090754 \h 2  HYPERLINK \l _Toc449090755 1.3.1输入键盘的选择  PAGEREF _Toc449090755 \h 2  HYPERLINK \l _Toc449090756 1.3.2显示屏的选择  PAGEREF _Toc449090756 \h 2  HYPERLINK \l _Toc449090757 1.3.3原理和算法  PAGEREF _Toc449090757 \h 3  HYPERLINK \l _Toc449090758 1.3.5 完成预估  PAGEREF _Toc449090758 \h 4  HYPERLINK \l _Toc449090759 第2章系统硬件设计  PAGEREF _Toc449090759 \h 5  HYPERLINK \l _Toc449090760 2.1 STM32F103ZET6最小系统板  PAGEREF _Toc449090760 \h 5  HYPERLINK \l _Toc449090761 2.2 4x4矩阵键盘  PAGEREF _Toc449090761 \h 6  HYPERLINK \l _Toc449090762 2.3 1602液晶显示屏  PAGEREF _Toc449090762 \h 7  HYPERLINK \l _Toc449090763 第3章系统软件设计  PAGEREF _Toc449090763 \h 9  HYPERLINK \l _Toc449090764 3.1主程序流程  PAGEREF _Toc449090764 \h 9  HYPERLINK \l _Toc449090765 3.2.1输入捕获  PA