Use case: DMA channel direct mode transfer in interrupt mode ¶

Sequence diagram ¶

DMA channel direct mode transfer in interrupt mode.

@startuml
hide footbox
participant "User Application" as part1
participant "DMA Driver" as part3
participant "NVIC" as part4

group Configuration
part1->part3 : HAL_DMA_Init()
end

group Process
group Start
part1->part3 : HAL_DMA_Start_IT()
end

group Interrupt
part4->part3 : HAL_DMA_IRQHandler()
part3->part1 : User callback()
end
end

@enduml

Code snippet ¶

HAL1	HAL2
HAL_DMA_Init(&hdma); HAL_DMA_Start_IT(&hdma, (uint32_t)srcBuffer, (uint32_t)destBuffer, dataSize);	HAL_DMA_Init(&hdma1, GPDMA1_CH0); HAL_DMA_SetConfigDirectXfer(&hdma, &directXferConfig); HAL_DMA_StartDirectXfer_IT(&hdma, (uint32_t)srcBuffer, (uint32_t)destBuffer, dataSize * multiplier);

HAL1

HAL2

                HAL_DMA_Init(&hdma);

HAL_DMA_Start_IT(&hdma, (uint32_t)srcBuffer, (uint32_t)destBuffer, dataSize);

                HAL_DMA_Init(&hdma1, GPDMA1_CH0);
HAL_DMA_SetConfigDirectXfer(&hdma, &directXferConfig);

HAL_DMA_StartDirectXfer_IT(&hdma, (uint32_t)srcBuffer, (uint32_t)destBuffer, dataSize * multiplier);

Key changes ¶

HAL2 starts interrupt-driven direct transfers using HAL_DMA_StartDirectXfer_IT() (or the optimized variant).
HAL2 uses HAL_DMA_SetConfigDirectXfer() to configure the transfer before starting it.
The DMA interrupt handler remains HAL_DMA_IRQHandler().