How do I convert the recieved metadata to string so that I can show it on an SPI TFT display.

[msaraswat15031997]

Hello sir, I am building a bluetooth speaker with a TFT display, I have an i2s amp connected and using A2DP sink , I want to show the metadata recieved on the tft but I don't know how to convert it to a string. I get the title, and time on the serial monitor but Also want to show things like the volume , artist, title , time etc and whatever possible but I don't know how to. So sorry I am not an expert in programming.

[pschatzmann]

Why don't just just look at the provided example and try it out?
Your question does not make any sense because you can see that you are actually getting strings...

To decode the id you can use https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/esp_avrc.html#_CPPv423esp_avrc_md_attr_mask_t

[msaraswat15031997]

I'm really Sorrry sir. Here's my code, i need to print the song title on the TFT in the loop funciton.

#include <TFT_eSPI.h>
#include <SPI.h>
TFT_eSPI tft = TFT_eSPI();

#include "BluetoothA2DPSink.h"
BluetoothA2DPSink a2dp_sink;
bool is_active = true;

void setup(void) {
tft.init();
tft.setRotation(1);

i2s_pin_config_t my_pin_config =
{
.bck_io_num = 26,
.ws_io_num = 25,
.data_out_num = 33,
.data_in_num = I2S_PIN_NO_CHANGE
};
a2dp_sink.set_pin_config(my_pin_config);
a2dp_sink.set_avrc_metadata_callback(avrc_metadata_callback);
a2dp_sink.set_avrc_metadata_attribute_mask(ESP_AVRC_MD_ATTR_TITLE | ESP_AVRC_MD_ATTR_PLAYING_TIME |ESP_AVRC_MD_ATTR_ARTIST );
a2dp_sink.start("bt");
}

void avrc_metadata_callback(uint8_t data1, const uint8_t *data2) {
Serial.printf("AVRC metadata rsp: attribute id 0x%x, %s\n", data1, data2);
}

void loop() {
tft.fillScreen(TFT_GREY);
tft.setCursor(0, 0, 2);
tft.setTextColor(TFT_WHITE,TFT_BLACK); tft.setTextSize(1);
tft.println(songname);
}

[pschatzmann]

Why don't you just move the output from the loop to the callback ? And make sure that you select the titles only with data == ESP_AVRC_MD_ATTR_TITLE.
If this has a negative effect on the audio you would just need to save the a copy of the title when you get it in a global variable.

[msaraswat15031997]

So I create a

Char xyz = ESP_AVRC_MD_ATTR_TITLE;

Will this put the title info in xyz?

I'm so sorry to have caused trouble.

[pschatzmann]

I would try the following first:

void avrc_metadata_callback(uint8_t typ, const uint8_t *text) {
  if (typ== ESP_AVRC_MD_ATTR_TITLE){
    tft.fillScreen(TFT_GREY);
    tft.setCursor(0, 0, 2);
    tft.setTextColor(TFT_WHITE,TFT_BLACK); 
    tft.setTextSize(1);
    tft.println(text);
  }
}

void loop() {
}

[msaraswat15031997]

Wow, you're a savior, thank you for such quick replies. Running right now and trying it out :D

[msaraswat15031997]

Just WOW! I got the text up and running on the tft.

Also how do I display the remaining data,like the time and artist, ?