ESP32 Forum

Posted: **Fri Jan 10, 2025 8:48 am**

Hi!

I have been trying to run a code for my ESP32-H2-Mini-1 board. The code is supposed to send a byte via UART TX pin and I then want to view the sent byte on a logic analyzer. Now the problem is that no matter which pin I set for UART TX(e.g. 16, 12, etc), I always see the output on the actual TX pin on the board.

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However, when I try to set the actual pin for TX (GPIO24)as per documentation, I can still not see the correct data on the logic analyzer. I see an different value at every second whereas the actual value is supposed to be A.

My code is as follows:

Code: Select all

// UART port and pins definitions
#define UART_RX 23
#define UART_TX 24

// Create object for UART communication
HardwareSerial radarComm(2); // Using UART0 for communication

void setup() 
{
  // Initialize serial communication for debugging
  Serial.begin(115200);
  // Serial.println("Info: Initalizing ESP32...\n");

  // Initialize UART0 for radar sensor communication
  radarComm.begin(9600, SERIAL_8N1, UART_RX, UART_TX);
  // Serial.println("Info: Radar sensor communication initialized.\n");

}

void loop() 
{
  // Send a simple character
    radarComm.write('A'); 
    Serial.println("Sent: A");

  // Add a 1 second delay in transmission
  delay(1000);
}

I have also tried to connect the TX pin to RX pin and then check the data, but the board didn't boot in this scenario.

I have connected to the board via USB-C to USB-C cable on its UART port. I am running the code on Arduino IDE. Also, I'm using Logic 2 to view the data.

Can you please help me figure out the issue?

Posted: **Fri Jan 10, 2025 9:16 am**

Hi,

You have another topic with a related discussion here.

Posted: **Fri Jan 10, 2025 10:20 am**

Well, the problem is different now. My code is running but I don't see the correct data at the output.

Posted: **Fri Jan 10, 2025 11:01 am**

Ok then.
Have you tried this code?

Posted: **Mon Jan 13, 2025 7:40 am**

Yes, I have tested that code, and while the code does indeed run on ESP32, I see no output in the logic analyzer.

Posted: **Mon Jan 13, 2025 8:50 am**

Can you please give more details about your setup?

Arduino Core version.
Printscreen of the Tools menu on the Arduino IDE.
A picture of the wires connection with the logic analyzer.
The code you're testing.

Posted: **Mon Jan 20, 2025 12:18 pm**

Hi,

I apologize for the last reply. I had actually fixed the issue. So the issue was that I was using two serial objects. The main Serial object for debugging and the HardwareSerial object. The working TX pin of the ESP32 was using the Serial object. So when I tried to send data via the HardwareSerial object, it would coincide with data from Serial. So I removed the usage of Serial object and set the HardwareSerial to use UART0, and that is how I started seeing data on the UART TX pin of ESP32.

Posted: **Tue Jan 21, 2025 9:31 am**

Thanks for the feedback!

ESP32 Forum

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UART TX Pin Configuration for ESP32-H2-Mini-1

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Re: UART TX Pin Configuration for ESP32-H2-Mini-1

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Re: UART TX Pin Configuration for ESP32-H2-Mini-1

Re: UART TX Pin Configuration for ESP32-H2-Mini-1

Re: UART TX Pin Configuration for ESP32-H2-Mini-1

Re: UART TX Pin Configuration for ESP32-H2-Mini-1