anchor.diff:  \ These registers are not used often
   \ 302104 1024f0 gdconst GD.REG_TOUCH_MODE
   \ 302114 102500 gdconst GD.REG_TOUCH_OVERSAMPLE
  +\ 302108 1024f4 gdconst GD.REG_TOUCH_ADC_MODE
  +\ 30210c 1024f8 gdconst GD.REG_TOUCH_CHARGE
  +\ 302110 1024fc gdconst GD.REG_TOUCH_SETTLE
   \ 00000001 constant GD.CTOUCH_MODE_COMPATIBILITY
   \ 00000000 constant GD.CTOUCH_MODE_EXTENDED
   
  
positive.code:     gd2-unsel
  ;
  
  : hostcmd ( u -- )
      gd2-sel
          >spi
      00 >spi
      00 >spi
      gd2-unsel
      60 ms
  ;
  
  : measureF ( -- u ) \ measure FT800's actual clock frequency
  
negative.code:     gd2-spi-init
      gd2-unsel
  
      custom @ execute
  ;
  
  