operation of HAL_SPI_TransmitReceive_DMA

[pass3master]

This question is about the operation of HAL_SPI_TransmitReceive_DMA.

When HAL_SPI_TransmitReceive_DMA(&hspi1 ...) is being transmitted (assumed SPI communication_A) and HAL_SPI_TransmitReceive_DMA(&hspi1 ...) is called (assumed SPI communication_B) SPI communication_A will be canceled and SPI communication_B will be executed? Or is SPI communication_B executed after SPI communication_A is completed?

[STea · Accepted solution]

Hello @pass3master ,

HAL_SPI_TransmitReceive_DMA will wait for the first transmit/receive operation as the second one will be blocked by HAL lock and unlock process and HAL state busy or ready.
Regards

[pass3master]

Thank you for your response. I understand how it works, so I will consider it “resolved”.