// --------------------------------------------------------------------------
// Sym-1 digital I/O interface example
//
// Wayne Parham
//
// wayne@parhamdata.com
// --------------------------------------------------------------------------

#include <sym1.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void main(void) {
   unsigned char ddr1a =   0x00;
   unsigned char ior1a =   0x00;
   unsigned char ddr1b =   0x00;
   unsigned char ior1b =   0x00;
   unsigned char ddr2a =   0x00;
   unsigned char ior2a =   0x00;
   unsigned char ddr2b =   0x00;
   unsigned char ior2b =   0x00;
   unsigned char ddr3a =   0x00;
   unsigned char ior3a =   0x00;
   unsigned char ddr3b =   0x00;
   unsigned char ior3b =   0x00;
   unsigned char   val =   0x00;
   int           going =   0x01;
   int           instr =   0x01;
   int               l =   0x00;
   char*            vp =   0x00;
   char        cmd[20] = { 0x00 };

   while( going ) {

      putchar( '\r' );
      for( l = 0; l < 25; l++ ) {
         putchar( '\n' );
      }

      ddr1a = VIA1.ddra;
      ior1a = VIA1.pra;
      ddr1b = VIA1.ddrb;
      ior1b = VIA1.prb;
      ddr2a = VIA2.ddra;
      ior2a = VIA2.pra;
      ddr2b = VIA2.ddrb;
      ior2b = VIA2.prb;
      ddr3a = VIA3.ddra;
      ior3a = VIA3.pra;
      ddr3b = VIA3.ddrb;
      ior3b = VIA3.prb;

      puts( "================== Digital I/O Status ==================" );
      puts( "     Port1A   Port1B   Port2A   Port2B   Port3A   Port3B" );    
      printf( "DDR    %02X       %02X       %02X       %02X       %02X       %02X\n\r",ddr1a,ddr1b,ddr2a,ddr2b,ddr3a,ddr3b );
      printf( "IOR    %02X       %02X       %02X       %02X       %02X       %02X\n\r",ior1a,ior1b,ior2a,ior2b,ior3a,ior3b );
      puts( "========================================================\n" );

      if( instr ) {
         puts( "You  can set any register by typing 'register value'  so" );
         puts( "as  an example, to set register IOR2A with the top  five" );
         puts( "bits  off  and  the bottom three on,  type  'IOR2A  07'." );
         puts( "Press  ENTER without any command to see register  values" );
         puts( "without changing any of them.   Type 'help' to see these" );
         puts( "instructions again and type 'quit' to end the program.\n");
         puts( "Available registers:   DDR1A, IOR1A, DDR1B, IOR1B, DDR2A" );
         puts( "IOR2A, DDR2B, IOR2B, DDR3A, IOR3A, DDR3B and IOR3B." );
         instr = 0;
      }

      printf( "\n Command:  " );

      fgets(cmd, sizeof(cmd)-1, stdin);
      cmd[strlen(cmd)-1] = '\0';

      if( strncasecmp(cmd, "quit", 4) == 0) {
         going = 0;  
      }
      else if( strncasecmp(cmd, "help", 4) == 0) {
         instr = 1;
      }
      else if( strncasecmp(cmd, "ddr1a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA1.ddra = val;
         }
      }
      else if( strncasecmp(cmd, "ior1a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA1.pra = val;
         }
      }
      else if( strncasecmp(cmd, "ddr1b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA1.ddrb = val;
         }
      }
      else if( strncasecmp(cmd, "ior1b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA1.prb = val;
         }
      }
      else if( strncasecmp(cmd, "ddr2a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA2.ddra = val;
         }
      }
      else if( strncasecmp(cmd, "ior2a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA2.pra = val;
         }
      }
      else if( strncasecmp(cmd, "ddr2b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA2.ddrb = val;
         }
      }
      else if( strncasecmp(cmd, "ior2b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA2.prb = val;
         }
      }
      else if( strncasecmp(cmd, "ddr3a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA3.ddra = val;
         }
      }
      else if( strncasecmp(cmd, "ior3a", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA3.pra = val;
         }
      }
      else if( strncasecmp(cmd, "ddr3b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA3.ddrb = val;
         }
      }
      else if( strncasecmp(cmd, "ior3b", 5) == 0) {
         vp = strchr(cmd, ' ');
         if( vp ) {
            val = (unsigned char) strtol( vp, NULL, 0 );
            VIA3.prb = val;
         }
      }
   }
}