1 Reply Latest reply on Aug 1, 2018 11:25 PM by VasanthR_91

    Strange problems with DMA/SPIS



      I have been using SPIS and feeding the TX buffer using DMA. However, the following strange behavior is observed :

      • When the output GPIO RS485_IO5 (that is used for debugging and not connected to anything in the board) is enabled, the DMA works.
      • If I disable the GPIO (right click - disable) . the DMA stops working ......


      This has been confirmed a few times. nothing else is changed in the design/code or the board .....



      SPIS mode 0

      SPIS tx interrupt is FIFO NOT FULL

      DMA drq is set on LEVEL



      I apologize, but I will not be able to share the design. if data is missing I will provide it in comments.