3.3.7

libraries/ESP32/examples/Serial/BaudRateDetect_Demo/BaudRateDetect_Demo.ino

@@ -0,0 +1,36 @@
+/*
+   This Sketch demonstrates how to detect and set the baud rate when the UART0 is connected to
+   some port that is sending data. It can be used with the Arduino IDE Serial Monitor to send the data.
+
+   Serial.begin(0) will start the baud rate detection. Valid range is 300 to 230400 baud.
+   It will try to detect for 20 seconds, by default, while reading RX.
+   This timeout of 20 seconds can be changed in the begin() function through <<timeout_ms>> parameter:
+
+   void HardwareSerial::begin(baud, config, rxPin, txPin, invert, <<timeout_ms>>, rxfifo_full_thrhd)
+
+   It is necessary that the other end sends some data within <<timeout_ms>>, otherwise the detection won't work.
+
+   IMPORTANT NOTE: baud rate detection seem to only work with ESP32 and ESP32-S2.
+   In other other SoCs, it doesn't work.
+
+*/
+
+// Open the Serial Monitor with testing baud start typing and sending characters
+void setup() {
+  Serial.begin(0);  // it will try to detect the baud rate for 20 seconds
+
+  Serial.print("\n==>The baud rate is ");
+  Serial.println(Serial.baudRate());
+
+  //after 20 seconds timeout, when not detected, it will return zero - in this case, we set it back to 115200.
+  if (Serial.baudRate() == 0) {
+    // Trying to set Serial to a safe state at 115200
+    Serial.end();
+    Serial.begin(115200);
+    Serial.setDebugOutput(true);
+    delay(1000);
+    log_e("Baud rate detection failed.");
+  }
+}
+
+void loop() {}