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STM32F446: SAI1-B and UART4 simultaneous usage problem

Question asked by Ulrich Bruch on May 23, 2017
Latest reply on May 23, 2017 by waclawek.jan

Hi there,

i have the following issue:

Part: STM32F446V

HAL: Cube32MX, Version 1.16.0


I use SAI1-A with an ADC to sample audio signals (Stereo, 24Bit, 24kHz).

An Audio-DAC is connected to the SAI1-B. The SAI-B generates a waveform via DMA in circular mode. 

This works well but - when using UART4 (for debugging), 

the SAI1-B is not working. SAI1-A is still working.

As long, as i don´t call the function HAL_UART_Transmit(), everything works as expected. After calling this function (the UART4 works as expected), the SAI1-B stops generating it´s signals.


Maybe someone of you can bring some light to this?


Many thanks in advance,