STM32的ADC采集实现的信号抓取，然后通过串口传到上位机中显示

之前有小伙伴提到需要虚拟示波器的资料，有些库还有文件丢失了，直接给的工程跑不起来，这里我把关键的地方讲解一下，大家可以自行开发。其实开发不难，只是有些点会耗点时间。虚拟示波器，顾名思义，它是一种非物理示波器，但它也是硬件（便携式采集设备）和软件（在计算机上显示和操作）的结合，与数字示波器相比，本质上没有太大区别。现在更贵的数字示波器在功能上也很像电脑)。今天我们要讲的只是虚拟示波器的低配置和简单版本(下一年的毕业设计)。基于下位机STM32的ADC采集实现的信号捕获，然后通过串口传输到上位机显示。单片机的ADC与串口传输注定了虚拟示波器采集的波形频率不会太高。在上位机上恢复良好的波形频率为25Khz下面，如果你有其他更快的收集(DSP,FPGA，NI采集卡)和数据上传的方式(USB等等)，你可以试试，期待你的分享。以下是硬件(外围电路)和单片机程序(STM32)和上位机程序，(labview)解释三个部分。

1、硬件

硬件很简单，就是处理输入单片机的波形信号。因为我用的STM32单片机的电压值为0~3.3V，所以硬件部分就是把输入的交流信号先控制在-1.65V~1.65V最后，信号通过电路向上偏置1.65V可以收集单片机。至于如何将信号放大放小，控制到可收集的电压范围，可以将串口数据发送片机发送串口数据，让单片机控制继电器（或其他开关方式）切换输送端电阻，改变输出倍数，最后在上位机界面上恢复波形信号。我先在这里用LM358双电源运放芯片(交流信号，需要双电源运放芯片)，后来因为LM358高频输入时，运输输出信号在零点失真，更换高频运输芯片UA问题解决了。双电源内的负电压通过LCL7660输出的。至于偏置电压，是我在multisim以上模拟，实际测试后确实可以偏置，您可以尝试使用1-1运输后添加偏置电压，也可以参考我的设计电路。附上完整的电路图。

1-1：运放电路

这是毕业设计中直接使用的图片，之前的文件不见了。你应该能理解 。使用最简单的负反馈放大电路。放大倍数Vout/Vin=R1/R2。

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1-2：负电压电路

由于运放芯片想运放负极电压信号，需要采用双电源模式，必须为运放芯片提供负电压。所以本设计采用低功率，额定电压为5V的电源极性转换器ICL7660。ICL7660输入5V正电压，输出-5V电压。为LM358提供双电源。本设计采用ICL7660的基本负电压转换模式。

1-3：1.65V偏置电路（自己仿真实现的，实测可用）

 

2、单片机软件

        这个直接用STM32的单片机ADC采集和串口例程，将数据分高4位和低8位的方式（单片机串口只能上传8位的数据），将12位的ADC数据通过串口分别传输给上位机，ADC采样率调到最高，串口通过DMA的方式，这样可以达到最高的采集速度。最后分别用两个for循环，循环往串口发送1000个低8位和1000个高4位数据。每次发送两组1000个数据的间隔你们可以自己定，我记得我应该间隔是100ms左右刷新一次数据，上位机整合两组数据后，一次显示1000个数据点。ADC和串口传输数据的可以在STM32的例程中找到，具体逻辑这里不再累述。不过还是附上当年写的几条程序吧。

1、连续读取1000个ADC数据；

2、拆分低8位和高4位；

3、向串口上传低8位数据；

4、向串口上传高4位数据；

3、上位机

        上位机在整合两次接收的数据，直接调用Labview提供的信号分析函数，如单频测量函数，频谱测量函数以及幅值和电平测量函数。

3-1：读取串口数据

 3-2：整合高4位，低8位位数据。右侧输出直接给到波形显示控件

 3-3：波形控件

前面板->控件->新式->图形->波形图。

4、最终整合后的虚拟示波器效果

 采集的信号范围为5HZ~25KHZ（STM32F1系列采样率最高为0.5MS/s），0.1V~16.5V的模拟信号；幅值误差低于5%，频率误差低于2%，能满足日常中大多信号/电压的信号采集与分析。希望对大家有所作用，也希望国内开源资源能越来越丰富吧。虽然一般技术不能给我们工程师带来多大的财富，但至少在某个年龄段，在追求一种引以为傲的技能的时候，能让我们感到充实，自豪，也是一种不错的人生体验呢！

原创不易，一键三连拉！