/* IMPORTANT: I don't know if it's necessary, but I put 10k resistors on
 * the transmit and receive pins of the pic, just to be safe, and it works fine.
 */

/*                     PIC16F84
 *                   .-----------.
 *   TRANSMIT white -|RA2     RA1|- 
 *   RECEIVE orange -|RA3     RA0|- 
 *                  -|RA4    OSC1|- XT CLOCK pin1, 27pF to GND
 *      PUSH BUTTON -|MCLR   OSC2|- XT CLOCK pin2, 27pF to GND
 *              GND -|Vss     Vdd|- +5v
 *           LCD D4 -|RB0     RB7|- ICSP
 *           LCD D5 -|RB1     RB6|- ICSP
 *           LCD D6 -|RB2     RB5|- LCD EN
 *           LCD D7 -|RB3     RB4|- LCD RS
 *                   '-----------'       
 *
 *  PUSH BUTTON = PIN - BUTTON - GND
 *                PIN - 10k - +5v
 */

/*  rs232 interface (serial port communications) without a level converter.
 *  Therefore microcontroller pins are connected DIRECTLY to the serial cable.
 *  Therefore inverted (from standard) logic is used.
 *  
 *  PIC PIN01 PORTA2 - TRANSMIT (receive at PC end of serial cable) white
 *  PIC PIN02 PORTA3 - RECEIVE (transmit at PC end of serial cable) orange
 */

/*  looking head on at the female connector of a serial mouse coard:
 *  i.e. the end that plugs into your pc
 *
 *  5 4 3 2 1      =      blue    null    orange      white    null
 *   9 8 7 6       =          null    null      yellow     null
 *
 *  the following are loose wires on the other end of the coard.
 *  i.e. where it would have been soldered to the mouse circuit board.
 *
 *  5 = blue   = gnd   = GND
 *  3 = orange = PC_td = PIC PIN02 PORTA3
 *  2 = white  = PC_rd = PIC PIN01 PORTA2
 *  7 = yellow = rts   = unused
 */

#include <pic.h>
#include "delay.c"
#include "lcd.c"
#include "rs232.c"

__CONFIG(WDTDIS & XT & UNPROTECT);

main(void) 
{
  unsigned int i = 0;
  unsigned char c;

  TRISA = 0b00001000; 
  TRISB = 0b00000000; 

  rs232_initialize();
  lcd_initialize(); 

  rs232_send_string("Hello: ");
  for (i=0;i<2;i++) 
  {
    rs232_echo_char();
  }

  lcd_draw_logo();

  for (i=0;i<2;i++) 
  {
    c = rs232_echo_char();
    rs232_send_char(c);
  }

  lcd_clear_and_home();

  for (i=0;i<2;i++) 
  {
    c = rs232_echo_char();
    lcd_write_char(c);
  }
}