This code sets up an ESP32 to act as a Bluetooth A2DP sink, receiving audio from Bluetooth devices and streaming it to an external audio system via I2S. It uses Direct Memory Access (DMA) for efficient audio data transfer. The code configures the I2S interface for audio communication and includes a ...

I think, it is because, they are all connected to the same PORT. When any of pins on one port (for example B) are active, NVIC starts interup called EXIT as external interupt, and you need to manualy look at each pin, to see wich one is connected.