关于使用STM32的DA模块连续输出正弦波信号与AD采集并配合matlab实时绘图的实验

2019-04-13 13:38发布

站内文章 / 模拟电子
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使用资源：STM32F407ZGT6芯片，板载DAC1通道1（定时器触发），板载ADC1通道5，板载DMA1数据流5，通道7，CH340串口USB模块。
大体思想：使用u16的数组产生原始正弦波数据序列，通过DMA1将原始数据写入DAC寄存器，同时产生正弦波，AD读取频率稍大于DA频率。将AD读取寄存器中的数据以串口发送至matlab软件，以实现对DAC原始数据以及ADC采集所得到的数据的实时波形图的绘制。
matlab代码如下：%% clc; global t; global x; global m; global ii; t=10; x=10; ii=10; m=[0]; global t1; global x1; global m1; global ii1; t1=10; x1=10; ii1=10; m1=[0]; global counter; global flag; flag = 0; counter = 0; %x=0; %figure(1); subplot(1,2,1); p = plot(t,m,'r-','EraseMode','background','MarkerSize',5); axis([0 20 -5 5]); grid on; title('DA原始数据显示'); xlabel('时间/ms'); ylabel('振幅/V'); %figure(2); subplot(1,2,2); q = plot(t1,m1,'r-','EraseMode','background','MarkerSize',5); axis([0 20 -5 5]); grid on; title('AD采集波形显示'); xlabel('时间/ms'); ylabel('振幅/V'); %% try s=serial('com5'); catch error('cant serial'); end set(s,'BaudRate',115200,'DataBits',8,'StopBits',1,'Parity','none','FlowControl','none'); s.BytesAvailableFcnMode = 'terminator'; s.BytesAvailableFcn = {@callbackcom,p,q}; fopen(s); pause; fclose(s); delete(s); clear s close all; clear all; %% function callbackcom(s, ~, p,q) global t; global x; global m; global ii; global t1; global x1; global m1; global ii1; global counter; global flag; out = fscanf(s); data_o = str2double(out); data = 3.3*data_o/4096; if data_o>15000&&data_o<25000 flag = 1; counter = 1; end if data_o>25000&&data_o<34000 flag = 1; counter = 2; end if flag == 0 if counter == 1 %绘制原始DA数据图 counter = 0; t = [t,ii]; m = [m,data]; set(p, 'xData',t,'yData',m(1,:)); drawnow; x = x+0.0390625; axis([x-10 x+10 -5 5]); %移动坐标绘图 grid on; ii = ii+0.0390625; end if counter == 2 %绘制AD采集的数据 counter = 0; t1 = [t1,ii1]; m1 = [m1,data]; set(q, 'xData',t1,'yData',m1(1,:)); drawnow; x1 = x1+0.0390625; axis([x1-10 x1+10 -5 5]); %移动坐标绘图 grid on; ii1 = ii1+0.0390625; end end flag = 0; end
单片机部分代码：int main(void) { delay_init(168); uart_init(115200); sin_Generation(); GPIO_Configuration(); TIM6_Configuration(); DAC_DMA_Configuration(); Adc_Init(); while(1) { for(i = 0; iDAC配置：#define PI 3.14159 #define DAC_DHR12R1_ADDRESS 0x40007408 u16 sinTable[tableSize]; void sin_Generation(void) { u16 n; for(n=0;n




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