Displaying Fast Data

dmccric 0

C# -> WPF -> .NET 6

Windows 10 64-bit, Visual Studio Community 2022 v17.9.2

I am writing a program in which I want to see the current from a 3-phase brushless DC Motor. Each phase will be displayed in a different colour to differentiate them. I have managed to get this to work to some extent.

I have a PIC32 MCU which sends a 57 byte data packet (8x16-bit value for each phase, 9 byte header) out at 115,200 bps, I send a full motor revolution of data and then skip 50 revolutions so the data rate is not ridiculous. The motor speed is 200 RPS.

My C# WPF program receives and parses this data very well but when I want to display the data using either LiveCharts or other program it slows down considerably, therefore I want to know if I can do this another way.

Method

I create a serial class which I have a background worker thread receiving my data into a 5k byte buffer, the head.

Another background worker thread, the tail, will attempt to parse and decode the data and if the checksum is good then it will fire an event to store this data in a serialised class so it can be saved. The data is then marshalled in to the UI Thread so it can be displayed.

I was thinking of simply setting a separate thread on a timer which will display the data in chunks instead of .

If I simply do not display the data on a chart then I can receive over 10k data packets without a single bad packet.

The UI Thread chart seems to be the bottleneck, obviously.

Am I running to many threads on a single process?

Should I send more data in a single packet as displaying more data in one go might be more preferable to less data more often?

Any help is appreciated.

Hongrui Yu-MSFT 2,465 Reputation points Microsoft Vendor

2024-05-16T08:19:33.42+00:00
Hi,@dmccric. Welcome to Microsoft Q&A.

1. In WPF, it is allowed to create multiple threads in a process

<Button x:Name="button1" Grid.Row="1" Content="Start" Click="Button_Click_1" Margin="10"/>

Way 1：

private async void Button_Click_1(object sender, RoutedEventArgs e) {     await Task.Run(GetData);     await Task.Run(ProcessingData);     MessageBox.Show("yes"); } public async Task GetData() {     MessageBox.Show("haha");     await Task.Delay(1000); } public async Task ProcessingData() {     MessageBox.Show("ok");     await Task.Delay(1000); }

      Way 2:

private async void Button_Click_1(object sender, RoutedEventArgs e) {     button1.Dispatcher.InvokeAsync(GetData, DispatcherPriority.SystemIdle);     button1.Dispatcher.InvokeAsync(ProcessingData, DispatcherPriority.SystemIdle);     MessageBox.Show("yes"); } public void GetData() {     MessageBox.Show("haha"); } public void ProcessingData() {     MessageBox.Show("ok"); }

2. If you have a large amount of data in packets, this is demanding on the network and can delay the real-time update of the charts when preparing and delivering the data

3. If you still want to use LiveCharts, it is recommended to let LiveCharts handle smaller amounts of data. For example, instead of plotting all the data for the current, a trend is represented by a graph. When encapsulating packets, the data can be averaged every 5 and the maximum and minimum values can be taken at key locations such as inflection points

In short, you transfer data quickly and make LiveCharts a small amount of work

For questions about LiveCharts, you could ask on the LiveCharts forum (Issues · beto-rodriguez/LiveCharts2 · GitHub).
dmccric 0 Reputation points

2024-05-16T12:51:10.56+00:00

I have been simply invoking the data to the dispatcher synchronously every time I receive a data packet. I will try Dispatcher.InvokeAsync and see what happens. I will play around with the priority as well.

I have seen programs display a hell of a lot more data than I am displaying and so one of these methods should get me there.

I will simply have to play around with the amount of data I and sending and want to display like you said.

Appreciate your reply.

1 answer

dmccric 0 Reputation points

2024-05-16T12:46:36.7033333+00:00

As I said, the parsing and decoding are fine with no bad checksums.

Dispatching to the UI Thread to change the visual data is the bottleneck, I did not use the Dispatcher.InvokeAsync and I guess I will have to play around with the priority as well.

I have seen programs display a hell of a lot more data than I am displaying and the responsiveness has still been good so one of these methods should get me there.

Thanks for the reply.
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Hongrui Yu-MSFT 2,465 Reputation points Microsoft Vendor

2024-05-17T08:34:30.4433333+00:00

Hi,@dmccric

1. As mentioned in the previous code

button1.Dispatcher.InvokeAsync(GetData, DispatcherPriority.SystemIdle);

Which is to set the priority through DispatcherPriority.SystemIdle, This is an enumeration type, among which DispatcherPriority.Send has the highest priority

2.LiveCharts is a third-party library. For LiveCharts performance optimization issues, you can ask the LiveCharts forum(Issues · beto-rodriguez/LiveCharts2 · GitHub)

3.Due to policy reasons, I cannot recommend third-party libraries. You can search the keyword "more efficient chart library" on Google and choose a library that meets your needs to optimize performance.
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