LL_ADC_MULTI_REG_DMA_LIMIT_3 macro

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