/* 877_15seg1.c
 *
 * Copyright (c) 2002, 2003 Bruce Kroeze
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * ---------------------------------
 *
 * Displays characters on a 15 seg led module
 *
 * Revisions:
 * 22 Dec 2002 - Initial Version
 *
 * Hardware:
 * 16F877 at 20Mhz
 * PCF8574P I2C IO Expander (IO1)
 * PCF8574P I2C IO Expander (IO2)
 * display connected with:
 * IO1 P0-P8: ABCDEFGH
 * IO2 P0-P7: IJKLMNO
 */

#include "defs_877.h"
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(CLOCK=20000000)
#use fast_io(b)
#include "15seg.h"
#use rs232(baud=9600, PARITY=N, BITS=8, xmit=PIN_C7, rcv=PIN_C6)
#use i2c(master, sda=PIN_C4, scl=PIN_C3, FORCE_HW)

#DEFINE IO1 0b01000000
#DEFINE IO2 0b01000010

char curr;
int16 work;

void write_i2c_byte(int8 addr, int8 data)
{
  i2c_start();
  i2c_write(addr);
  i2c_write(data);
  i2c_stop();
}

void display_segs(int16 ch)
{
  write_i2c_byte(IO1, ch ^ 0xFF);
  write_i2c_byte(IO2, (ch >> 8) ^ 0xFF);
}

void print_ch(char ch)
{
  work = get_15seg(ch);
  printf("Got val: 0x%LX\n\r", work);
  display_segs(work);
}

void main()
{
  setup_psp(PSP_DISABLED);
  TRISB = 0; // all output
  TRISD = 0;
  PORTB = 0xFF;
  PORTD = 0xFF;
  printf("Ready to display.\n\r");
  while (1) {
    curr = getch();
    printf("%c = %X\n\r", curr, curr);
    print_ch(curr);
  }
}