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   XPost: sci.electronics.design   
      
   On 12/09/2024 20:35, john larkin wrote:   
   > RP2040 has I think 2 PIO blocks and each has a couple of hardware   
   > programmable state machines, and those can be set up to drive pins.   
   > I'm mostly concerned now with a PCB schematic design, picking the   
   > appropriate and easy-to-route pins from the CPU to things.   
   >   
   It would be unusual for the pins in numerical order not to be part of   
   the same PIO block   
   So you might as well design the PCB that way.   
      
   > My general question, for various processors, is how to associate bits   
   > in integer variables with physical pins on the chip.   
      
   Well that is a software issue.   
   I thought that on the Pi PICO there was software to do a bulk set of pins   
      
   Yes.   
      
   https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#functions70   
   There is a set pins by mask - mask is up to 32 bits - and clear pins by   
   mask.   
      
   So presumably if you invert the mask (XOR with FFFF) and clear with that   
   and set with the original mask and add  a strobe pulse as well to latch   
   the data, its three calls in C....or have I misunderstood..not sure if   
   you can set AND clear simultaneously.   
      
   Now irrespective of whether the hardware supports more, that's as good   
   as you are going to get with the C SDK, and presumably only assembler is   
   faster. And presumably the actual gpio functions are written in   
   assembler anyway. So that (c gpio) will be as good as it gets.   
      
   What that leads to in respect of your original question is to treat the   
   gpio numbers as if they represented the bits in order.   
      
   https://forums.raspberrypi.com/viewtopic.php?t=326719   
      
   That conversation implies that they are.   
      
   So gpio 0-12 should e.g. go to the DAC lsb->msb set of bots.   
      
   These are all arranged in order down one side of the board, so it should   
   be easy   
      
   Good luck!   
      
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