DRAFT

Author: pschatzmann

examples/examples-communication/serial/mp3-xon-xoff/receive-mp3/receive-mp3.ino

@@ -35,7 +35,7 @@ void setup() {
   Serial.begin(115200);
   AudioLogger::instance().begin(Serial, AudioLogger::Info);
 
-  Serial1.begin(115200);
+  Serial0.begin(115200);
 
   // set up buffer here to allow PSRAM usage
   buffer.resize(1024 * 10);  // 10kB buffer

examples/examples-communication/serial/mp3-xon-xoff/send-mp3/send-mp3.ino

@@ -3,6 +3,7 @@
  * @file send-mp3.ino
  * @brief Example of sending an mp3 stream over Serial the AudioTools library.
  * We use xon/xoff to control the flow of the data.
+ * I am using an ESP32 Dev Module for the test with the pins TX=17 and RX=16.
  */
 
 #include "AudioTools.h"
@@ -19,15 +20,15 @@ void setup() {
   AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Error);
 
   // setup serial data sink
-  Serial1.begin(115200);
+  Serial2.begin(115200);
 
   // mp3 radio
   url.begin("http://stream.srg-ssr.ch/m/rsj/mp3_128", "audio/mp3");
 }
 
 // Determine if we can send data from the flow control sent by the receiver
-bool isAcive() {
-  char c = Serial1.read();
+bool isActive() {
+  char c = Serial2.read();
   switch (c) {
     case xon:
       is_active = true;

examples/examples-communication/serial/mp3/send-mp3/send-mp3.ino

@@ -1,10 +1,10 @@
 
 /**
  * @file send-mp3.ino
- * @brief Example of sending an mp3 stream over Serial the AudioTools library.
+ * @brief ESP32 Example of sending an mp3 stream over Serial the AudioTools library.
  * The processing must be synchronized with RTS/CTS flow control to prevent a
- * buffer overflow and lost data.
- * We get the mp3 from an URLStream.
+ * buffer overflow and lost data. We get the mp3 from an URLStream.
+ * We used a ESP32 Dev Module for the test.
  */
 #include <HardwareSerial.h>
 
@@ -15,15 +15,18 @@ URLStream url("ssid", "password");  // or replace with ICYStream to get metadata
 HardwareSerial MP3Serial(1);             // define a Serial for UART1
 StreamCopy copier(MP3Serial, url);       // copy url to decoder
 // pins
-const int MySerialTX = 17;
-const int MySerialRX = -1;
-const int MySerialRTS = 19;
-const int MySerialCTS = -1;
+const int MySerialTX = 17; // TX2
+const int MySerialRX = -1; // not used
+const int MySerialRTS = 4; // GPIO 4
+const int MySerialCTS = -1; // not useed
 
 void setup() {
   Serial.begin(115200);
   AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
 
+  // improve performance
+  MP3Serial.setTxBufferSize(1024); // must be called before begin
+
   // setup serial data sink with flow control
   MP3Serial.begin(115200, SERIAL_8N1);
   MP3Serial.setPins(MySerialRX, MySerialTX, MySerialCTS, MySerialRTS);