is bit-width 8 or 16?

[khanhhuyen-comnosoft]

Hi, I just wonder why you are using a PCM file with a bitwidth of 8, but the I2S configuration is set to 16. How can it work? If I try to change the input file to a u16be bitwidth PCM, it produces noise

[liux-pro]

Hi,

16-bit data is too large for flash, so I’m using 8-bit data and converting it to 16-bit by shifting bits. Each 8-bit value is converted to 16-bit and stored in a buffer. This approach also allows me to control the volume by adjusting the number of left shifts.

EPS32-S3-I2S-MAX98357/main/i2s_test.c

Lines 44 to 47 in 18538cb

	for (int i = 0; i < EXAMPLE_BUFF_SIZE; i++) {
	offset++;
	buffer[i] = pcm_start[offset]<<3;
	}

[liux-pro]

While the sound quality is indeed reduced, it still sounds fine to me.

[khanhhuyen-comnosoft]

thank for response, if so, why you don't config i2s to handle 8 bit-width data? I try to do this but there is no sound, if I feed 16 bit-width input, it will play weird sound (noise).

[FAOEOYI]

thank for response, if so, why you don't config i2s to handle 8 bit-width data? I try to do this but there is no sound, if I feed 16 bit-width input, it will play weird sound (noise).

I have the same problem as you, and the same noise is made. Have you solved it? Can you tell me?