ESP32 Wroom - Serial Port

Projects Programming
1

Hello

I am using Uart 2 on pins 16 and 17 of the ESP32 Wroom module

Setup consists of ......
Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2);
Serial2.println("Hello World");

When the module is rebooted a 3 ramdon characters are printed prior to the string

Is there away to prevent this from happening ?

Any suggestions would be appreciated

Thank you

2

Start up glitches are common on serial ports. Why do you need to prevent it?

3

Where is serial2 printing to?

The ESP32 uses GPIO_1 and GPIO_3 to print to the serial monitor.

Serial1 is naturally assigned to GPIO_16 and GPIO_17. Mapping one Serial2 to Serial1 may not be the wisest use.

4

On an ESP32 I use serial this way

#include <HardwareSerial.h>

HardwareSerial SerialTFMini( 1 );
HardwareSerial SerialBrain( 2 );
////// serial(1) = pin27=RX green, pin26=TX white
////// serial(2) = pin16=RXgreen , pin17=TX white

voided setup()
{
  Serial.begin( SerialDataBits );
  SerialBrain.begin( SerialDataBits );
  SerialTFMini.begin(  SerialDataBits, SERIAL_8N1, 27, 26 );
}
5

There is a chance the connected device may do something strange if it receives bad sequence of characters....It would seem logical to eliminate if possible

6

What is the connected device? How does it interpret your, "Hello world"? :slight_smile:

7

Suppress Boot messages - ESP32 Forum

Under Arduino, I do not know if there is a solution.

8

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