Pls help to check my ADC DMA settings for NUCLEO-F767ZI

[SSong.3]

I would like to configure ADC1 and ADC2 as dual interleaved mode, for continues ADC conversion. And use DMA to transfer the converted data to RAM.

The goal is to implement a continues ADC at the fastest sample rate with dual interleaved mode (4.5MSPS)

But i am totally confused by the DMA data width and burst size settings.

I know that when using ​ADC dual mode, the ADC conversion result is combined into the ADC_CDR register. So I would expect the Peripheral data width is "Word", not "half word".

But when I try to set it to "word", it result in hard fault interruption.

Only when I set it to "half word" it seems to work without hard fault.

I also would like to turn on the FIFO here, and then I am also confused how to setup the Burst size here. I tried a few combinations but I still don't know what should be the correct value here.

Attached is my .ioc file. Please help to guide me on what is the correct configuration to enable DMA with FIFO and get the data width/burst size right.

Thanks a lot!

Shan Song​