From: anthonypaulo@gmail.com   
      
   Sorry for what might be a stupid question but I’ve been pulling the DMA line   
   low by setting my gpio pin to output and clearing it, which sends a digital   
   zero to the Dma line and that seems to work. However, searching online I see   
   mention of simulating    
   an open collector output by setting the gpio to input instead. I would like to   
   do this the right way, so I’m wondering what the correct method is, and   
   whether connecting it to ground will suffice.   
      
   Thanks in advance!   
      
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