ESP32 Hardware serial issue.

[abanik]

Hello,
In my project, I am using Serial1 of ESP32 for RS485 and Serial2 for GSM module serial. After obtaining data from Serial1, I use the Serial1.end() to clear the buffer. After this the GSM modules fails to responds[unable to get any response for AT commands sent]. On investing the uartBegin() in esp32-hal-uart.c , there is section after which commenting then both the serial works normally.

uartBegin_issue.txt

Function for uartBegin()

(1.94 KiB) Downloaded 367 times

I wish to know what exactly is that section doing and why is Serial2 getting affected due to if that section is not commented.
Any help will be appreciated.

[mikemoy]

Just curious why your using Serial1.end() ?

Disables serial communication, allowing the RX and TX pins to be used for general input and output. To re-enable serial communication, call Serial.begin().

https://www.arduino.cc/reference/en/lan ... erial/end/