I2S DMA Audio stuttering/repeating snippets on STM32G071RB

[spottame12]

Hi everyone, I'm new to STM32 and I'm building an audio player. I'm using an SD card (via SPI) to feed audio data to a dac via I2S.The audio stutters and often plays the same 1-2 second snippets twice before moving on.I've tried implementing double buffering and i've checked the i2s configuration in circular mode.Code:https://github.com/darty555/stm32-i2s-dma.git

[AScha.3]

Hi,

> I'm building an audio player.

Good !  I made a player also. :)

>I'm new to STM32

Not good...for such a project. 

>on STM32G071RB

Hmmm....i used a STM32F411 at first, that was working ok ; but i think, this class is minimum for a real good working player : SD-card interface , 100MHz core, 128KB ram .

Now i use a STM32H743ZIT , can play wav, flac, mp3 ; 

+

Basically you doing it right , similar to my first version on F411 : circular dma, reading/filling data in callbacks.

But what data speed you get in SPI mode from card ? check it, i suppose its too slow.

[spottame12]

For SPI i have 32 Mbits/s

[AScha.3]

So you set the SPI to 32 M ? But did you check, what data rate you get from card ?

Because i never tried it with spi reading, only SDIO or SDMMC ; and even here the card needs about 0.5...2 ms to respond to a command, then data coming with ...16MB/s (200 Mbit speed, in 4bit-mode) in my tests.

Did you test real data speed ? and how is it working, with the unknown delay after a command, until data is coming from card ? + what delay you get, until data coming , in spi mode ?

[FBL]

Hi @spottame12 

In my understanding, bytes_read points to nowhere. FatFs will attempt to write the number of bytes read into that address.