stm32l452re two ADC with DMA to capture 512 samples of each channel in parallel mode how to.

[CJaro]

ADC_CommonInstructure.ADC_Mode = DC_DualMode_RegSimult-----

what #iclude should point to?

[Tesla DeLorean]

You should just need top level #include file stm32l4xx_hal.h, and select ADC in stm32l4xx_hal_conf.h

Also add the appropriate library source file(s) to the project