Code to drive a CNC machine via a PC LPT port lookalike 25 pin 'D', experiment in 'PC/Mach3' replacement. Designed to compile and run on mbed LPC1768, Freescale KL25Z and Freescale KL46Z. Proved on LPC1768 and KL25Z, problem with serial port on KL46Z. Reads subset of 'G Codes' through usb/serial port and drives 3 stepper/servo drives for X, Y and Z, also similar Step/Dir outputs for spindle motor control. Emulates PC LPT, outputs 'charge pump', proved driving Seig KX3 CNC mill

Dependencies:   MODSERIAL mbed

--- a/cnc.h	Fri Jan 31 11:16:21 2014 +0000
+++ b/cnc.h	Thu Feb 06 08:45:02 2014 +0000
@@ -1,9 +1,12 @@
-#define axis_speeds_buffsize 20
-struct  axis_speeds_element {
-    signed  long    x, y, z, a, duration_ticks;
-    bool    ready;
-}   ;
+const   double  TWO_PI = 8.0 * atan(1.0);
+const   double  epsilon = 1e-5;
+struct  pirbufgrain {
+    double  x,
+            y,
+            z,
+            c,
+            f_rate;
+    }   ;
 struct  singleGparam    {   //  Place to put all we know about 'x' or 'j' etc parameter from G Code line
     double          dbl;
@@ -16,10 +19,11 @@
     struct  singleGparam   x, y, z, i, j, r, a, b, c, d;   //  After sorting, know where to find any X, Y etc values !
 }   ;
-struct  digital_readouts    {
-    signed int x, y, z, a, b, c;    //  Allow up to six dros
+struct  digital_readouts    {   //  DROs keep count of 'Step' positive edges detected in interrupt handler
+    signed long x, y, z;    //  Could easily expand up to six or more dros
     bool    dro_output;             //  To enabe / disable output to terminal
 }   ;
 extern  const double  n_for_onemmpermin, feed_rate_max, feed_rate_min, spindle_min, spindle_max;
-extern  const   long  pulses_per_mm, max_mm_per_min, interrupt_period_us;
+//extern  const   long  pulses_per_mm, max_mm_per_min, interrupt_period_us;
+extern  const   double  pulses_per_mm, max_mm_per_min, interrupt_period_us;