HAL_SAI_Start()?

[JTedot]

With the HAL on an STM32U5 nucleo i can

HAL_SAI_DMAPause()
HAL_SAI_DMAResume()
HAL_SAI_DMAStop()
HAL_SAI_Receive_DMA()
HAL_SAI_Transmit_DMA()

Wouldn't it make sense to have a

HAL_SAI_DMAStart()

?

With this nomenclature i don't have a clue how to tx/rx data to/from an audio device. Where can i find an official, minimal reproducible example utilizing either the receive-function or the rxCompleteCallbacks?

[LCE · Accepted solution]

HAL_SAI_DMAStart() - start what, RX or TX? 😉

A look into these functions might help...

HAL_SAI_Receive_DMA() starts receiving data, means you have an ADC connected,

HAL_SAI_Transmit_DMA() starts transmitting data, means you have a DAC connected.

I guess you're using CubeMX, so check the local repo (C:\Users\"user name"\STM32Cube\Repository) for examples.

I don't know the STM32U5, but I guess it's very similar most other SAIs, there's some info and tutorials out there.

And in case of doubt, Always read the reference manual!

[JTedot]

Alright, found out that calling either HAL_SAI_T/R_DMA() once with the circular mode on acts exactly as i would have imagined a HAL_SAI_DMAStart() to work. It triggers the half- and complete callbacks and fills the buffers autonomously, thank you. I don't understand your mentioning of an ADC or DAC, the SAI is most commonly used with I2S or PCM, both have nothing to do with neither ADC nor DAC (?)