i2s/stm32f4: Fix duplex DMA mode - #3733
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In I2S duplex mode buffer provided to i2s system is used for both TX and RX path. Separate DMA streams are configured for this. Interrupt was generated for both streams resulting in notification function call twice for same buffer. Now TX interrupt handler does nothing in duplex mode. RX DMA interrupt will fire shortly after TX and only then buffer can be returned back to the user. Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>
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In I2S duplex mode buffer provided to i2s system
is used for both TX and RX path.
Separate DMA streams are configured for this.
Interrupt was generated for both streams resulting in notification function call twice for same buffer.
Now TX interrupt handler does nothing in duplex mode. RX DMA interrupt will fire shortly after TX and only then buffer can be returned back to the user.