SunFounder ESP32 Starter Kit
5. Play audio on the device and the audio should be played through the speaker connected to the ESP32.
Code Explanation
1. The code starts by including the BluetoothA2DPSink.h library, which is used to receive audio data from the
Bluetooth-enabled device. The BluetoothA2DPSink object is then created and configured with the I2S interface
settings.
#include "BluetoothA2DPSink.h"
BluetoothA2DPSink a2dp_sink;
2. In the setup function, the code initializes an i2s_config_t struct with the desired configuration for the I2S
(Inter-IC Sound) interface.
void setup() {
const i2s_config_t i2s_config = {
.mode = (i2s_mode_t) (I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_
˓→BUILT_IN),
.sample_rate = 44100, // corrected by info from bluetooth
.bits_per_sample = (i2s_bits_per_sample_t) 16, // the DAC module will␣
˓→only take the 8bits from MSB
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
.communication_format = (i2s_comm_format_t)I2S_COMM_FORMAT_STAND_MSB,
.intr_alloc_flags = 0, // default interrupt priority
.dma_buf_count = 8,
.dma_buf_len = 64,
.use_apll = false
};
a2dp_sink.set_i2s_config(i2s_config);
a2dp_sink.start("ESP32_Bluetooth");
}
• The I2S interface is used to transfer digital audio data between devices.
• The configuration includes the I2S mode, sample rate, bits per sample, channel
format, communication format, interrupt allocation flags, DMA buffer count,
DMA buffer length, and whether to use the APLL (Audio PLL) or not.
150 Chapter 1. For Arduino User
To Next Page
Loading...
Need help?
General