Matlab和Arduino

Question

我试图测试matlab和arduino之间的通信，并发生一些奇怪的事情。 我尝试使用数字1到10来接收它们。它适用于2,3,4 .... 10但是1我得到：

警告：读取失败：超时期限内未返回指定数量的数据。

如果我再次运行它，我会得到相同的结果。为1我得到错误，我得到2到10.我没有重置运行之间的arduino。那是奇怪的部分。

我的arudino代码：

uint32_t next_number;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
  next_number = 0;
}

void loop() {
  if (Serial.available() >= sizeof(next_number)) {
    uint8_t data_read = Serial.readBytes((uint8_t*)&next_number, sizeof(next_number));
    Serial.write((uint8_t*)&next_number, 4);
    digitalWrite(13, HIGH);
  }
}

我的Matlab代码：

function send_song_to_arduino()
    delete(instrfind);
    s = serial('COM3');
    disp(['s input buffer size ', num2str(s.InputBufferSize)]);
    set(s,'Terminator','LF'); % define the terminator for println
    set(s,'Databits',8);
    set(s,'Stopbits',1);
    set(s,'Parity','none');
    set(s, 'BaudRate', 9600);
    fopen(s);
    disp(['available at start ', num2str(s.bytesavailable)]);
    disp(['left to send at start ', num2str(s.BytesToOutput)]);
    if (s.bytesavailable > 0)
        fread(s, s.bytesavailable, 'uint8')
    end
    disp('starting');
    for i=1:10
        fwrite(s, i, 'uint32');
        pause(1);
        disp(['available ', num2str(s.bytesavailable)]);
        received = fread(s, 1, 'uint32');
        disp(['recv ', mat2str(received)]);
    end
    disp(['done available ', num2str(s.bytesavailable)]);
    disp(['total sent ', num2str(s.ValuesSent)]);
    disp(['left to send at end ', num2str(s.BytesToOutput)]);
    fclose(s);
    delete(s);
end

结果：

>> send_song_to_arduino
available at start 0
left to send at start 0
starting
available 0
Warning: Unsuccessful read: The specified amount of data was not returned within the Timeout period. 
recv zeros(1,0)
available 4
recv 2
available 4
recv 3
available 4
recv 4
available 4
recv 5
available 4
recv 6
available 4
recv 7
available 4
recv 8
available 4
recv 9
available 4
recv 10
done available 0
total sent 10
left to send at end 0

Answer 1

我的解决方案： 显然，matlab串口打开重置arduino。 arudino端的序列需要一些时间才能启动，因此第一个请求在arduino准备好之前发送。我刚刚在fopen之后添加了一个暂停。