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Mono audio source in Flash

Alexmouse
Senior

‎2021-11-05 08:24 AM

I want to play an audio clip over i2s from Flash memory. My application is mono and a mono source will fit in flash, but not stereo, it is too big.

The HAL i2s interface does not appear to offer a mechanism to duplicate mono source bytes (16b) onto the stereo stream. Am I missing something? (STM32F411)

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12 REPLIES 12
MM..1
Chief III
In response to MM..1

‎2021-11-09 08:50 AM

Why you dont use IT or DMA mode? Or when you plan blocking mode send one sample per call i mean FIFO buffer handle one sample send ok.

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Alexmouse
Senior

‎2021-11-09 08:52 AM

Looks like I need to go stereo & DMA. Seems a waste when I will discard 50% of the data.

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Alexmouse
Senior

‎2021-11-09 08:59 AM

One sample per call seems to work much better, thanks for the idea!

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