Databases
StackOverflow2013
Postsdbo
POC#: An approach to plot rapid serial port data
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC#: An approach to plot rapid serial port data
    text
    copied!<p>I am trying to plot real time data. A circuit sends data rapidly and I know that the first byte is '$', next 16 bytes as sound and last byte is pulse sensor data.I am using a method that stores data to an array and it continuously adds data inside array starting from the last index.</p> <pre><code>byte[] Read_Data1 = new byte[100000]; byte[] Read_Data2 = new byte[100000]; byte[] Read_Data3; private void myPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { if (!myPort.IsOpen) return; while (myPort.BytesToRead &gt; 0) { int bytes = myPort.BytesToRead; byte[] buffer = new byte[bytes]; myPort.Read(buffer, 0, bytes); bytetobyte(Read_Data1, buffer, buffer.Length, count); count += buffer.Length; } } public void bytetobyte(byte[] Storage, byte[] databyte, int datacount, int count) { //count comes from count += buffer.Lenght int abc; for (abc = 0; abc &lt; datacount; abc++) { Storage[abc+count] = databyte[abc]; } } </code></pre> <p>Then I start to process the data using a method that works with timer's tick. I should remove first byte '$' and need to save 16 bytes to a list and 1 byte to another list. Here is the method:</p> <pre><code>byte[] Read_Data3; LinkedList&lt;byte&gt; data; public void DrawingAudioData(byte[] data) //This method works inside timer. { Read_Data2 = Read_Data1; int lastCount = count; int division = count / 18; int remaning = (count - 18 * division); Read_Data3 = new byte[count - remaning]; for (int i = 0; i &lt; count - remaning ; i++) { Read_Data3[i] = Read_Data2[i]; } count = 0; IPointListEdit listAuido = curveAudio.Points as IPointListEdit; IPointListEdit listPulse = curvePulse.Points as IPointListEdit; XDate time = new XDate(DateTime.Now); if (Read_Data3 == null) return; data= new LinkedList&lt;byte&gt;(Read_Data3); if(data.First == null) return; if (data.Count &gt;= 18 &amp; data.ElementAt(0) == Convert.ToByte('$')) { data.Remove(veri.ElementAt(0)); for (int x = 0; x &lt; 16; x++) { listAuido.Add(time, data.ElementAt(0)); data.Remove(data.ElementAt(0)); } listPulse.Add(time, data.ElementAt(0)); data.Remove(data.ElementAt(0)); } lastCount = 0; } </code></pre> <p>I think that when timer ticks I should have a new byte because serialport sends data rapidly and data are changed inside of Read_Data1. After that I equalize count to zero. Because data still flows and I don't want to my array goes out of rang. Then I start to process the new Read_Data2. I must process each 18 bytes as I said before so I trim the Read_Data2 and removed the reamaning last few data and I equalize <code>Read_Data3[i]=Read_Data2[i];</code> Then using a <code>LinkedList</code> that includes Read_Data3, I tried to write a loop that removes the first data after fill it into a list. After processing LinkedList, lastCount is equaled zero because I should set a new size according to new data set. Looks the logic is true but I have a problem. Sometimes the pulse sensor data is listing into the audio data. I mean the data should be inside the listPulse but it goes into the listAudio. </p> <p>First of all I want to know approach is a correct approach. I mean using a timer is a good idea for rapid data? Please share your opinions. If you have a better way please tell me or give a reference article or samples' link. Thank you.</p>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload