hi, when playing wav files from sd card through spi interface via the i2s (audio codec pcm1770) interface( dma enabled) my audio is little bit slow ..do spi have the enough speed to do it or should i choose sdio for sd card interface ?

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Guru

SDIO definitely provides more bandwidth.

On SPI you'd probably want to do large aligned block reads, and buffer effectively so as to improve efficiency and avoid copying.

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