/* Moore FSM   filename  MOORE11.C
   Simulator program of a Moore Finite State Machine

   This example accompanies the book
     "Embedded Microcomputer Systems: Real Time Interfacing", Brooks-Cole, copyright (c) 2000,
      Jonathan W. Valvano 7/6/99

   Interface between the TExaS simulator running a MC68HC11 EVB
      with ICC11 freeware compiler 
   TExaS Copyright 1999 by Jonathan W. Valvano 
   for more information about ICC11 
      see http://www.imagecraft.com
   You may use this file without restrictions
*/

/* PortC bits 1,0 are input, Port B bits 1,0 are output */

#include "HC11.h"
const struct State{
   unsigned char Out;            /* Output to Port B */
   unsigned int Time;            /* Time in cycles to wait in this state */
   const struct State *Next[4];  /* Next state if input=0,1,2,3 */
};
typedef const struct State StateType;
typedef StateType * StatePtr;

#define SA &fsm[0]
#define SB &fsm[1]
#define SC &fsm[2]
StateType fsm[3]={
   {0x01,500,{SB,SA,SB,SC}},
   {0x02,100,{SC,SA,SB,SC}},
   {0x03,200,{SA,SA,SB,SA}}
};
void Wait(unsigned int delay){ int Endt;
    Endt=TCNT+delay;        /* Time (500ns cycles) to wait */
    while((Endt-(int)TCNT)>0);   /* wait */
};
StatePtr Pt;  /* Current State */
unsigned char Input;
void main(void){ 
  Pt=SA;                /* Initial State */
  DDRC=0x00;            /* PortC are inputs, PortB is output */
  while(1){
    PORTB=Pt->Out;
    Wait(Pt->Time);    /* Time to wait in this state */
    Input=PORTC&0x03;  /* Input=0,1,2,or 3 */
    Pt=Pt->Next[Input];
  }
};

void resetVectors(void){
/* not really a function, 
   but this must be last */
  asm(" org $FFFE");
  asm(" FDB __start");
  asm(" org $FC00"); /* puts rts in a harmless place */
/* string constants also placed here */
/* the value FC00 means you can have up to 1000 characters of strings  */
}