What happens when the cortex core tries to access a memory location being written by dma?.

[Vde P.1]

For example, lets say that I have an ADC configured in continuous single channel dma mode, writing to an array of 1 uint32. If the core tries to read that address while the dma is writing to it can it get incorrect values? or does the bus matrix arbitration prevent this?

[Tesla DeLorean]

One defers to the other, so you either get to read the original value, or the one just written.

[Vde P.1]

okay, thank you

[Tesla DeLorean]

Generally you'd want to architect the code so you don't create self-induced race hazards with DMA buffers. ie you chasing​ a fill, or out running an empty.

[Muhammed Güler]

DMA is active only if the processor is not using the bus. they cannot work at the same time