I2S and SDRAM

[radhlw]

Hi all,

I am using an STM32F429 discovery board to develop a DSP platform for making some sound effects. I have I2S streaming and passing through, and I have SDRAM configured where I can talk to it and even transfer my buffers on and off it.

Where I am struggling is a very peculiar behavior. When I am running the I2S buffers off the internal ram, there are no issues. When I put said buffers on the SDRAM, the I2S works for about 10 seconds before it starts to make noise, become very loud and distorted and then just hiss.

I was wondering if anyone had any input on this?

[jiangfan]

perhaps the SDRAM read performance is too low.