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Internet radio and audio file player on ESP32-S3

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  • #2161 21817519
    ArturAVS
    Moderator  
    pawel_1980 wrote:
    I plugged in another tpa3116 amplifier and it no longer hums. So this series amp is nothing to buy

    One your opinion, is not an oracle.
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  • #2162 21817589
    pawel_1980
    Level 12  
    >>21817519
    Sure, I understand - I do not claim my opinion as an oracle. I just described my case and impressions after testing. For me as an "ordinary user" it is important that the new equipment works correctly after purchase without modifications and soldering. Those who can and like to fix - great, but not everyone has the time or skills to do so.

    I found a fix to improve the buzz in this XH-M543 series.
    https://github.com/v12345vtm/TPA3116D2/blob/m..._tpa3116d2-xh-m543_Sheet_1_20191123193718.pdf
    Quote:
    original 36dB is to high to use , and causes humm and hiss.
    Set to gain master 20db remove R3 (75k) change R4 to 5K6

    Additionally, TL074 can be omitted.
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  • #2163 21817631
    robgold
    Level 22  
    @pawel_1980 Read the datasheet Link on the TI website. Much will become clear to you. The TPA has gain control, operating frequency, power limiter, fault outputs, shutdown, mute. In these modules from Ali everything is "rigid" and cheap to use as few resistors/connectors as possible. The standard setting on the TI EVM is 26dB. I recommend you take a look at the schematic: Link

    As an example that not every TPA is so bad, two supposedly identical modules from the outside unrecognisable, on the second one next to it lies the original TI chip.
    On the second one a picture from the microscope screen (because I took the card out so I took it with my phone) the "Chinese" vs the original TPA. The question is whether both are original or the one soldered so well fake ;) Easily found out in most of these fake ones can't withstand 24V power supply and this is how it will work in my place.

    Audio amplifier module on a blue PCB with components and terminal connectors Two TPA3116 chips on PCB under magnification, showing different surface markings


    GAIN pin setting:
    GAIN settings table for TPA with highlighted R1 and R2 resistor values

    On these settings (without TL074) I test it with the radio and it plays great. You just have to take care of the soft start (with control of the SD/MUTE pin) of the TPA so that there is no crackle and of course cut the inverters on the OLED.

    As a curiosity, look for diagrams of Marantz, Denon all sorts of DNP (Denon Network Player) there is such a display and they also, in order not to have problems, power the OLED directly from the main power supply 19V + diode, which means about 18.4V coming out. No local inverters.
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  • #2165 21819097
    dawidkosciesza
    Level 8  
    >>21817631
    Hello.
    I built another radio 😁 but this time I just wanted it to be portable powered by a battery and have its own amplifier. It's to be used for Dad when he goes abroad for work, such a construction radio 🤪
    I used a TPA3110 and unfortunately there is a buzzing sound when powered together. At louder listening this is not audible however at volume around 2 it is audible. I have reduced the effect by using capacitors at the screen feed but it still occurs.
    The radio has now gone out into the world and I haven't had much time to make adjustments, but it will be back in a while and I'm curious to see what I can improve to eliminate the buzz.

    If the main culprit is the inverter in the screen then if I may ask it would be nice if someone could send some overview photo of how to remove/remove it.
    I have the power supply done at 12.6V and am wondering if using another step up inverter to this 19V would solve the issue.

    Regards.

    Internet radio and audio file player on ESP32-S3
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  • #2167 21819607
    ejcon
    Level 15  
    pawel_1980 wrote:
    >>21818723
    It is still possible to edit the BT name.
    I am analysing this BT software myself:
    Quote:
    https://github.com/jmper-ha/bt_source/blob/master/main/main.c

    What you want to change in this program is so simple ze
    Code: text Expand Select all Copy to clipboard
    /*
  EVO-BT-TX v3 (ESP32-WROOM-32D) — Arduino IDE + USB DEBUG + VOL 0..100
  --------------------------------------------------------------------
  Zmiany:
  - VOL ma zakres 0..100 (zamiast 0..30)
  - Mapowanie do A2DP: 0..127
  - Dodatkowo (opcjonalnie): BOOST 100..400 (% wzmocnienia cyfrowego próbek PCM)
      BOOST 100 = bez zmian
      BOOST 200 = 2x (może przesterować)

  Komendy:
    HELP, PING, GET/STATUS?
    BT ON, BT OFF
    MODE OFF|TX|AUTO
    VOL 0..100
    BOOST 100..400
    SCAN
    CONNECT <idx> lub CONNECT AA:BB:CC:DD:EE:FF
    DISCONNECT
    PAIRED?
    DELPAIRED ALL
    SAVE
    DBG 0|1
    HARDRESET
*/

#include <Arduino.h>
#include "BluetoothA2DPSource.h"

extern "C" {
  #include "nvs_flash.h"
  #include "nvs.h"
  #include "driver/i2s.h"
  #include "esp_gap_bt_api.h"
}

#include <stdarg.h>

// ====== KONFIG PINÓW (DOPASUJ) ======
static const int PIN_UART_RX = 16;
static const int PIN_UART_TX = 17;
static const uint32_t UART_BAUD = 115200;

// I2S (podsłuch z S3, równolegle z PCM5102A)
static const int PIN_I2S_BCLK = 26;
static const int PIN_I2S_WS   = 25;
static const int PIN_I2S_DIN  = 22;

// Audio: 48 kHz / 16-bit
static const int AUDIO_SR = 48000;
static const i2s_bits_per_sample_t AUDIO_BITS = I2S_BITS_PER_SAMPLE_16BIT;
// =====================================

HardwareSerial CTRL(2);
BluetoothA2DPSource a2dp;
static const i2s_port_t I2S_PORT = I2S_NUM_0;

// ====== DEBUG / LOG ======
static bool USB_DEBUG = true;

static void logLn(const char* s){
  CTRL.println(s);
  if (USB_DEBUG) Serial.println(s);
}

static void logF(const char* fmt, ...){
  char buf[256];
  va_list ap;
  va_start(ap, fmt);
  vsnprintf(buf, sizeof(buf), fmt, ap);
  va_end(ap);
  CTRL.print(buf);
  if (USB_DEBUG) Serial.print(buf);
}
// =========================

enum Mode : uint8_t { MODE_OFF=0, MODE_TX=1, MODE_AUTO=2 };
static volatile Mode g_mode = MODE_TX;

static bool g_btReady = false;
static bool g_scanning = false;

static String g_connMac = "";
static String g_connName = "";

// VOL: 0..100
static int g_vol_ui = 100;
static uint8_t g_vol_127 = 127;

// BOOST: 100..400 (%)
static int g_boost_pct = 400;

struct Dev {
  esp_bd_addr_t bda{};
  int rssi = 0;
  String name;
  bool valid = false;
};
static Dev g_scan[25];
static int g_scanCount = 0;

// --------- Utils ----------
static String bdaToStr(const esp_bd_addr_t bda){
  char s[18];
  snprintf(s, sizeof(s), "%02X:%02X:%02X:%02X:%02X:%02X",
           bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
  return String(s);
}

static bool parseMac(const String& mac, esp_bd_addr_t out){
  int b[6];
  if (sscanf(mac.c_str(), "%x:%x:%x:%x:%x:%x", &b[0],&b[1],&b[2],&b[3],&b[4],&b[5]) != 6) return false;
  for(int i=0;i<6;i++) out[i] = (uint8_t)b[i];
  return true;
}

static void scanClear(){
  for (auto &d: g_scan) d = Dev();
  g_scanCount = 0;
}

static void scanStore(const esp_bd_addr_t bda, int rssi, const String& name){
  for(int i=0;i<g_scanCount;i++){
    if (g_scan[i].valid && memcmp(g_scan[i].bda, bda, 6) == 0){
      g_scan[i].rssi = rssi;
      if (name.length()) g_scan[i].name = name;
      return;
    }
  }
  if (g_scanCount >= (int)(sizeof(g_scan)/sizeof(g_scan[0]))) return;
  memcpy(g_scan[g_scanCount].bda, bda, 6);
  g_scan[g_scanCount].rssi = rssi;
  g_scan[g_scanCount].name = name;
  g_scan[g_scanCount].valid = true;
  g_scanCount++;
}

// --------- I2S ----------
static void i2s_init_slave_rx(){
  i2s_config_t cfg = {};
  cfg.mode = (i2s_mode_t)(I2S_MODE_SLAVE | I2S_MODE_RX);
  cfg.sample_rate = AUDIO_SR;
  cfg.bits_per_sample = AUDIO_BITS;
  cfg.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT;
  cfg.communication_format = I2S_COMM_FORMAT_I2S;
  cfg.dma_buf_count = 8;
  cfg.dma_buf_len = 256;
  cfg.use_apll = false;
  cfg.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1;

  i2s_pin_config_t pins = {};
  pins.bck_io_num = PIN_I2S_BCLK;
  pins.ws_io_num = PIN_I2S_WS;
  pins.data_out_num = -1;
  pins.data_in_num = PIN_I2S_DIN;
#if ESP_IDF_VERSION_MAJOR >= 5
  pins.mck_io_num = I2S_PIN_NO_CHANGE;
#endif

  i2s_driver_install(I2S_PORT, &cfg, 0, nullptr);
  i2s_set_pin(I2S_PORT, &pins);
  i2s_zero_dma_buffer(I2S_PORT);
}

// callback dla A2DP: pobiera dane audio
static int32_t get_data(uint8_t *data, int32_t len){
  size_t bytesRead = 0;
  if (i2s_read(I2S_PORT, data, len, &bytesRead, portMAX_DELAY) != ESP_OK) return 0;
  if (bytesRead == 0) return 0;

  if (g_boost_pct != 100){
    int16_t *s = (int16_t*)data;
    int count = bytesRead / 2;
    int gain_q10 = (g_boost_pct * 1024) / 100; // 100% = 1024
    for(int i=0;i<count;i++){
      int32_t v = (int32_t)s[i] * gain_q10;
      v >>= 10;
      if (v > 32767) v = 32767;
      if (v < -32768) v = -32768;
      s[i] = (int16_t)v;
    }
  }

  return (int32_t)bytesRead;
}

// --------- Discovery callbacks (z biblioteki) ----------
static bool ssid_found_cb(const char *ssid, esp_bd_addr_t address, int rssi){
  String name = ssid ? String(ssid) : String("");
  scanStore(address, rssi, name);
  logF("DEV %d %s RSSI=%d NAME=\"%s\"\n", g_scanCount-1, bdaToStr(address).c_str(), rssi, name.c_str());
  return true;
}

static void discovery_state_cb(esp_bt_gap_discovery_state_t st){
  if (st == ESP_BT_GAP_DISCOVERY_STARTED){
    g_scanning = true;
    logLn("SCAN START");
  } else if (st == ESP_BT_GAP_DISCOVERY_STOPPED){
    g_scanning = false;
    logF("SCAN DONE COUNT=%d\n", g_scanCount);
  }
}

// --------- NVS save/load ----------
static void cfg_save(){
  nvs_handle_t h;
  if (nvs_open("btcfg", NVS_READWRITE, &h) != ESP_OK){ logLn("ERR SAVE"); return; }
  nvs_set_i32(h, "mode", (int)g_mode);
  nvs_set_i32(h, "vol", g_vol_ui);
  nvs_set_i32(h, "boost", g_boost_pct);
  nvs_set_str(h, "mac", g_connMac.c_str());
  nvs_commit(h);
  nvs_close(h);
  logLn("OK SAVE");
}

static void cfg_load(){
  nvs_handle_t h;
  if (nvs_open("btcfg", NVS_READONLY, &h) != ESP_OK) return;

  int32_t m=0, v=50, b=100;
  size_t len=0;
  if (nvs_get_i32(h, "mode", &m) == ESP_OK) g_mode = (Mode)m;
  if (nvs_get_i32(h, "vol", &v) == ESP_OK) g_vol_ui = (int)v;
  if (nvs_get_i32(h, "boost", &b) == ESP_OK) g_boost_pct = (int)b;

  nvs_get_str(h, "mac", nullptr, &len);
  if (len > 1 && len < 32){
    char buf[32];
    if (nvs_get_str(h, "mac", buf, &len) == ESP_OK) g_connMac = String(buf);
  }
  nvs_close(h);

  if (g_vol_ui < 0) g_vol_ui = 0;
  if (g_vol_ui > 100) g_vol_ui = 100;
  g_vol_127 = (uint8_t)lround((double)g_vol_ui * 127.0 / 100.0);

  if (g_boost_pct < 100) g_boost_pct = 100;
  if (g_boost_pct > 400) g_boost_pct = 400;
}

// --------- BT start (raz) ----------
static void ensureBtStarted(){
  if (g_btReady) return;

  esp_err_t ret = nvs_flash_init();
  if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND){
    nvs_flash_erase();
    nvs_flash_init();
  }

  i2s_init_slave_rx();

  a2dp.set_local_name("EVO-BT-TX");
  a2dp.set_data_callback(get_data);
  a2dp.set_auto_reconnect(false);
  a2dp.set_ssid_callback(ssid_found_cb);
  a2dp.set_discovery_mode_callback(discovery_state_cb);

  a2dp.start();
  a2dp.set_volume(g_vol_127);

  g_btReady = true;
}

// --------- actions ----------
static void status_send(){
  logF("STATE BT=%s MODE=%s VOL=%d BOOST=%d SCAN=%d CONN=%d MAC=%s NAME=\"%s\"\n",
    g_btReady ? "ON":"OFF",
    g_mode==MODE_OFF?"OFF":(g_mode==MODE_TX?"TX":"AUTO"),
    g_vol_ui,
    g_boost_pct,
    g_scanning ? 1:0,
    g_connMac.length()?1:0,
    g_connMac.length()?g_connMac.c_str():"None",
    g_connName.c_str()
  );
}

static void soft_off(){
  if (g_scanning){
    esp_bt_gap_cancel_discovery();
    g_scanning = false;
  }
  a2dp.disconnect();
  g_connMac = "";
  g_connName = "";
  g_mode = MODE_OFF;
  logLn("OK MODE OFF");
}

static void scan_start(){
  ensureBtStarted();
  scanClear();
  esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 12, 0);
}

static void connect_mac(const String& mac){
  ensureBtStarted();
  esp_bd_addr_t bda{};
  if (!parseMac(mac, bda)){
    logLn("ERR CONNECT MAC");
    return;
  }
  bool ok = a2dp.connect_to(bda);
  if (ok){
    g_connMac = mac;
    g_connName = "";
    logF("OK CONNECT %s\n", mac.c_str());
  } else {
    logLn("ERR CONNECT");
  }
}

static void connect_idx(int idx){
  if (idx < 0 || idx >= g_scanCount || !g_scan[idx].valid){
    logLn("ERR CONNECT IDX");
    return;
  }
  String mac = bdaToStr(g_scan[idx].bda);
  connect_mac(mac);
  g_connName = g_scan[idx].name;
}

static void disconnect_bt(){
  a2dp.disconnect();
  g_connMac = "";
  g_connName = "";
  logLn("OK DISCONNECT");
}

static void paired_list(){
  ensureBtStarted();
  int n = esp_bt_gap_get_bond_device_num();
  if (n <= 0){
    logLn("PAIRED DONE COUNT=0");
    return;
  }
  esp_bd_addr_t *list = (esp_bd_addr_t*)malloc(n * sizeof(esp_bd_addr_t));
  if (!list){ logLn("ERR MEM"); return; }
  esp_bt_gap_get_bond_device_list(&n, list);
  for (int i=0;i<n;i++){
    logF("PAIRED %d %s NAME=\"\"\n", i, bdaToStr(list[i]).c_str());
  }
  free(list);
  logF("PAIRED DONE COUNT=%d\n", n);
}

// --------- DELPAIRED in background ----------
static TaskHandle_t g_delTask = nullptr;

static void delpaired_task(void *){
  ensureBtStarted();
  a2dp.disconnect();
  if (g_scanning){
    esp_bt_gap_cancel_discovery();
    g_scanning = false;
  }

  int n = esp_bt_gap_get_bond_device_num();
  if (n <= 0){
    logLn("OK DELPAIRED 0");
    g_delTask = nullptr;
    vTaskDelete(nullptr);
    return;
  }

  esp_bd_addr_t *list = (esp_bd_addr_t*)malloc(n * sizeof(esp_bd_addr_t));
  if (!list){
    logLn("ERR MEM");
    g_delTask = nullptr;
    vTaskDelete(nullptr);
    return;
  }

  esp_bt_gap_get_bond_device_list(&n, list);
  int removed = 0;
  for (int i=0;i<n;i++){
    if (esp_bt_gap_remove_bond_device(list[i]) == ESP_OK) removed++;
    vTaskDelay(pdMS_TO_TICKS(50));
  }
  free(list);

  g_connMac = "";
  g_connName = "";
  logF("OK DELPAIRED %d\n", removed);

  g_delTask = nullptr;
  vTaskDelete(nullptr);
}

static void delpaired_all_async(){
  if (g_delTask){
    logLn("ERR DELPAIRED BUSY");
    return;
  }
  logLn("OK DELPAIRED START");
  xTaskCreatePinnedToCore(delpaired_task, "delpaired", 4096, nullptr, 1, &g_delTask, 1);
}

// --------- cmd parser ----------
static void help_print(){
  logLn("CMDS: HELP, PING, GET, STATUS?, BT ON, BT OFF, MODE OFF|TX|AUTO, VOL 0..100, BOOST 100..400, SCAN, CONNECT <idx|MAC>, DISCONNECT, PAIRED?, DELPAIRED ALL, SAVE, DBG 0|1, HARDRESET");
}

static void handle_cmd(String s, const char* src){
  s.trim();
  if (!s.length()) return;

  logF("CMD[%s] \"%s\"\n", src, s.c_str());

  if (s == "PING"){ logLn("PONG"); return; }
  if (s == "HELP"){ help_print(); return; }

  if (s.startsWith("DBG ")){
    int v = s.substring(4).toInt();
    USB_DEBUG = (v != 0);
    logF("OK DBG %d\n", USB_DEBUG ? 1 : 0);
    return;
  }

  if (s=="GET" || s=="STATUS?"){ status_send(); return; }

  if (s=="BT ON"){ ensureBtStarted(); logLn("OK BT ON"); return; }
  if (s=="BT OFF"){ soft_off(); return; }

  if (s.startsWith("MODE ")){
    String m = s.substring(5); m.trim();
    if (m=="OFF"){ soft_off(); return; }
    if (m=="TX"){ ensureBtStarted(); g_mode=MODE_TX; logLn("OK MODE TX"); return; }
    if (m=="AUTO"){ ensureBtStarted(); g_mode=MODE_AUTO; logLn("OK MODE AUTO"); return; }
    logLn("ERR MODE"); return;
  }

  if (s.startsWith("VOL ")){
    int v = s.substring(4).toInt();
    if (v<0) v=0;
    if (v>100) v=100;
    g_vol_ui = v;
    g_vol_127 = (uint8_t)lround((double)g_vol_ui * 127.0 / 100.0);
    if (g_btReady) a2dp.set_volume(g_vol_127);
    logF("OK VOL %d\n", g_vol_ui);
    return;
  }

  if (s.startsWith("BOOST ")){
    int b = s.substring(6).toInt();
    if (b < 100) b = 100;
    if (b > 400) b = 400;
    g_boost_pct = b;
    logF("OK BOOST %d\n", g_boost_pct);
    return;
  }

  if (s=="SCAN"){ scan_start(); return; }

  if (s.startsWith("CONNECT ")){
    String a = s.substring(8); a.trim();
    if (a.indexOf(':') >= 0){ connect_mac(a); return; }
    int idx = a.toInt();
    connect_idx(idx);
    return;
  }

  if (s=="DISCONNECT"){ disconnect_bt(); return; }
  if (s=="PAIRED?"){ paired_list(); return; }
  if (s=="DELPAIRED ALL"){ delpaired_all_async(); return; }
  if (s=="SAVE"){ cfg_save(); return; }

  if (s=="HARDRESET"){ logLn("OK HARDRESET"); delay(50); ESP.restart(); }

  logLn("ERR UNKNOWN");
}

// --------- read line from stream ----------
static bool readLineFrom(Stream& st, String& buf, String& outLine){
  while (st.available()){
    char c = (char)st.read();
    if (c == '\n'){
      outLine = buf;
      buf = "";
      return outLine.length() > 0;
    } else if (c != '\r'){
      buf += c;
      if (buf.length() > 300) buf = "";
    }
  }
  return false;
}

void setup(){
  Serial.begin(115200);
  CTRL.begin(UART_BAUD, SERIAL_8N1, PIN_UART_RX, PIN_UART_TX);

  logLn("READY EVO-BT-TX");

  cfg_load();
  ensureBtStarted();
}

void loop(){
  static String bufUart, bufUsb, line;

  if (readLineFrom(CTRL, bufUart, line)){
    handle_cmd(line, "UART");
  }
  if (readLineFrom(Serial, bufUsb, line)){
    handle_cmd(line, "USB");
  }

  delay(1);
}
    logLn("READY EVO-BT-TX"); here is the name of the
  • #2168 21819751
    pawel_1980
    Level 12  
    >>21819607 On the BLUETOOTH SETTINGS page I meant that a name can be added.
  • #2169 21819789
    ejcon
    Level 15  
    >>21819751
    It can be done just why it should be called Evo-BT -Tx and that's it
  • #2170 21819810
    robgold
    Level 22  
    @dawidkosciesza It all depends what the source of the noise was. The quickest, easiest way is to reconfigure the GPIO drivers programmatically. With reasonably correct ground routing this calms the situation because the SPI stops transmitting noise although in the Evo the clocking is only 2MHz anyway. The second option is to isolate the OLED inverter ground, Then possibly to isolate the whole HV supply for the OLED. LowNoiseSPI mechanism is introduced in the latest version of EVO. Check GitHub I should be uploading this in the next few days.
  • #2171 21820168
    zbig10101
    Level 14  
    Two ESP32 PCBs next to a blue JLCPCB box
    I overcame the ordering problems and already have the boards for the 2 versions of the radio. It didn't even take long.
  • #2173 21820478
    zbig10101
    Level 14  
    Minimum order quantity is 5 copies.
    Colours of your choice. First order only 2usd with discount plus postage.
    Recommended
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Topic summary

The discussion centers on the development of an internet radio and audio file player based on the ESP32-S3-WROOM-1 module, featuring a custom-designed prototype PCB with OLED display and user controls including rotary encoders and buttons. Key challenges addressed include pin spacing discrepancies in the ESP32-S3 module footprint, integration of Wi-Fi connectivity with dynamic station list updates, and handling of Polish character encoding on the OLED display. The project uses Arduino IDE (version 2.3.2) with ESP-IDF support and requires enabling PSRAM. Audio playback supports MP3, AAC, and FLAC streams, with the ESP32-audioI2S library recommended over the incompatible Audio library. Users reported issues with SPI MISO pin assignment causing bootloader conflicts, resolved by reassigning MISO to pin 35. The project incorporates WiFiManager for network configuration, EEPROM and SD card storage for saving last played station and settings, and includes plans for tone control via an external KA2107 equalizer and a CS8673 amplifier module. Problems with encoder input stability and memory limitations for Bluetooth A2DP on ESP32-S3 were noted. The community suggested alternatives like KaRadio and ESP32-MiniWebRadio projects. Debugging tips include serial terminal logs for HTTP errors and flash memory erasure to resolve boot loops. The project is open-source on GitHub, encouraging forks and modifications. Additional features under development include browser-based updates, directory navigation, and potential audio recording to SD card.
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