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

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; i

DAC配置：

#define PI  3.14159
#define DAC_DHR12R1_ADDRESS     0x40007408

u16 sinTable[tableSize];

void sin_Generation(void)
{
	u16 n;
	for(n=0;n