ESP32 C3 Super Mini resets after reading serial line with C#

Question

I would like to read the serial data with a C# Windows Forms Application. The data is send with an ESP32 C3 Super Mini. When I use the Serial Monitor from the Arduino IDE everything works fine.

If I'm reading the serial data with my C# Application (serialPort1.ReadLine(); or serialPort1.ReadExisting();) I will get the data only once and then the ESP resets with this reason: rst:0x15 (USB_UART_CHIP_RESET),boot:0xc (SPI_FAST_FLASH_BOOT)

C# Code

private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    lblState1.Invoke(new MethodInvoker(ProcessData1));
}

private async void ProcessData1()
{
    //MessageBox.Show(serialPort1.ReadLine());
    MessageBox.Show(serialPort1.ReadExisting());
}

Arduino Code

unsigned long last_time = 0;

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    // Print a heartbeat
    if (millis() > last_time + 2000)
    {
        Serial.println("Arduino is alive!!");
        last_time = millis();
    }
}

A few days ago the application worked fine. After I upload a new programm to the ESP32 I got this problem and can't fix it.

Edit

DtrEnable and RtsEnable are set to false.

You might want to avoid doing Serial I/O on the GUI thread. Other than that, there surely is mor tto tthe serial connection than that, right? Where do you open it? Why don't you catch exceptions? — Fildor
– Fildor, Commented May 29, 2024 at 14:02
@Fildor The C# code is about 430 lines long and everything else worked so I reduced the code to the lines above and still got the same error. I open the serial port with the Form Shown event. In my code i am catching exceptions but I don't get any exception an the C# side. — Destiny
– Destiny, Commented May 29, 2024 at 14:12
If the source code you provided is correct, then perhaps it's because a message box is being displayed? The processing is probably stopped there, waiting for the operator to act. Wouldn't it be better to add the content to be displayed using a text box control? — kunif
– kunif, Commented May 29, 2024 at 14:31
@kunif I used the message box for debugging only since i got the Problem. Even if I do nothing with the data and just call serialPort1.ReadExisting(); I got the same error. — Destiny
– Destiny, Commented May 29, 2024 at 14:44
If I use your example I get this error from the catch inside the void Read(): The connection is closed — Destiny
– Destiny, Commented May 29, 2024 at 15:08

Destiny · Accepted Answer · 2024-05-30 08:40:20Z

0

Problem got solved over night by just leaving the Arduino unpluged. Thanks to @kunif for your help.

answered May 30, 2024 at 8:40

Destiny

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1 Comment

Ferry To Over a year ago

It will be better to leave it as a comment. :)

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