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ellasmith
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ellasmith
Asked: September 13, 2023In:
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Hi, I’m working on a circuit based on AiThinker ESP32-C3-13/ 13U- Kit and communicating the ESP32 kit with my computer through GPIO18 and GPIO19. The problem is when I open the COM port on my. In the net operation, MCU resets ...Read more

Hi,

I’m working on a circuit based on AiThinker ESP32-C3-13/ 13U- Kit and communicating the ESP32 kit with my computer through GPIO18 and GPIO19. The problem is when I open the COM port on my. In the net operation, MCU resets and boots itself. So I did some research and found out that the RTS pin is connected to the ESP32-C3 EN pin so when I open the port by my. Net operation on my computer to the ESP32 kit through the COM port, MCU gets a reset signal and reboot.

To answer this problem I set properties as below;

 _serialPort.PortName = port; _serialPort.BaudRate = 115200; _serialPort.DtrEnable = true; _serialPort.RtsEnable = false; // Set the read/write timeouts _serialPort.ReadTimeout = 1000; _serialPort.WriteTimeout = 1000; try { _serialPort.Open(); message = _serialPort.ReadLine(); if (message == "HELLO\r") { // device connected  _serialPort.Close(); statusLabel.Text = "Cihaz bulundu"; return (port); } }
Even though I disable RTS, MCU still resets and boots itself. I tried all combinations for the DtrEnable and RtsEnable properties. But the result did not change.

Anybody can help me to answer this issue?

Thank you

Ella

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aithinkercomesp32gpio18gpio19mcuportserial
  1. Julian White

    Hello, You should set handshake after setting property RtsEnable = true. Use properties as below:- _serialPort.RtsEnable = true; _serialPort.Handshake = System.IO.Ports.Handshake.RequestToSend; _serialPort.RtsEnable = false; Thank You

    Hello,

    You should set handshake after setting property RtsEnable = true. Use properties as below:-

     _serialPort.RtsEnable = true;
_serialPort.Handshake = System.IO.Ports.Handshake.RequestToSend;
_serialPort.RtsEnable = false;

Thank You
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