From c996036e6159dd23f7725e3c843c199a46fddf6f Mon Sep 17 00:00:00 2001
From: Rodrigo Garcia <rodrigo.garcia@espressif.com>
Date: Tue, 26 Jul 2022 10:41:04 -0300
Subject: [PATCH] Adds an error message to HardwareSerial::setPins() (#7040)

* Adds an error message to HardwareSerial::setPins()
In order to avoid problems if the user tries to setPins() before initializing the Serial port with begin()
---
 cores/esp32/HardwareSerial.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp
index acc1bd2c8..87a190ba1 100644
--- a/cores/esp32/HardwareSerial.cpp
+++ b/cores/esp32/HardwareSerial.cpp
@@ -491,6 +491,10 @@ void HardwareSerial::setRxInvert(bool invert)
 // negative Pin value will keep it unmodified
 void HardwareSerial::setPins(int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin)
 {
+    if(_uart == NULL) {
+        log_e("setPins() shall be called after begin() - nothing done");
+        return;
+    }
     uartSetPins(_uart, rxPin, txPin, ctsPin, rtsPin);
 }