LL_ADC_MULTI_REG_DMA_UNLMT_2 macro

ADC multimode group regular conversions are transferred by DMA, one DMA channel for all ADC instances (DMA of ADC master), in unlimited mode: DMA transfer requests are unlimited, whatever number of DMA data transferred (number of ADC conversions) is reached. This ADC mode is intended to be used with DMA mode non-circular. Setting of DMA mode 2: 2 or 3 (dual or triple mode) half-words by pairs, ADC2&1 then ADC1&3 then ADC3&2.