I have a question about DMA in the STM32L432 (and presumably similar more most STM32L4* devices). The background is that I'm trying to set up timer #2 driving a DAC, and have the DAC grab new data from a circular buffer via DMA.In the RM0394 reference manual (chapter 11: DMA controller), Table 41 details the request-to-channel multiplexor. For channel 3, CxS[3:0]=0110, it lists “TIM6_UP DAC_CH1.”First, what does TIM6_UP mean? Is it meant to be a timer update event, as somehow distinct from the timer trigger-output TRGO? In any case, chapter 10 (Peripherals Interconnect Matrix) doesn’t even mention any interconnect from timers to DMA. Second, what does it mean to have two sources listed for the same mux setting? In my application, TIM2 is triggering the DAC, and the DAC requests a DMA transfer – so TIM2 never directly talks to the DMA controller. Does the notation “TIM6_UP DAC_CH1” mean that either source can trigger the DMA transfer, and the user is responsible for ensuring that o
