/* Exercise 9.1 Morse States */
/* Created David Miles April 2006 */
/* Updated Ben Rowland Febuary 2014 */

#include <xc.h>

// CONFIG1
#pragma config FOSC = HS        // Oscillator Selection (HS Oscillator, High-speed crystal/resonator connected between OSC1 and OSC2 pins)
#pragma config WDTE = OFF       // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = ON       // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = OFF         // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config CPD = OFF        // Data Memory Code Protection (Data memory code protection is disabled)
#pragma config BOREN = ON       // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF   // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
#pragma config IESO = OFF       // Internal/External Switchover (Internal/External Switchover mode is disabled)
#pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is disabled)

// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config VCAPEN = OFF     // Voltage Regulator Capacitor Enable (All VCAP pin functionality is disabled)
#pragma config PLLEN = OFF      // PLL Enable (4x PLL disabled)
#pragma config STVREN = ON      // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
#pragma config BORV = LO        // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LVP = OFF        // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming)

#define _XTAL_FREQ 19660800	// Defines the hardware crystal frequency allowing the delay function to work correctly

#include "lcdlib.h"
#include "utils.h"

#define DOT_EVENT '.'           // Values for the events
#define DASH_EVENT '-'
#define SPACE_EVENT 32
#define STUCK_EVENT '*'

#define BUSY_STATE 'B'          // Values for the states
#define QUIET_STATE 'Q'

#define DEBUG


//Here is a test sequence for the morse code reader. I am sending three characters
unsigned char test_sequence [] =
{
    /* P */
    DOT_EVENT, DASH_EVENT, DASH_EVENT,
    DOT_EVENT, SPACE_EVENT,

    /* I */
    DOT_EVENT, DOT_EVENT, SPACE_EVENT,

    /* C */
    DASH_EVENT, DOT_EVENT, DASH_EVENT,
    DOT_EVENT, SPACE_EVENT,

    0x00 /* end marker */
} ;

unsigned char morse_state = QUIET_STATE ;       // State variable - set at QUIET


void setup_hardware (void)
{
    ANSELA = 0x00;              //Set PortA to use digital inputs
    ANSELB = 0x00;
    TRISA = 0xFF;               //PORTA set to inputs
    TRISB = 0x00;               //PORTB set to all outputs
}


//We call the function to deal with an event. How it behaves depends on the current state
void do_morse ( unsigned char event )
{

#ifdef DEBUG
    lcd_print_ch ( event ) ;
    lcd_print_ch ( morse_state ) ;
#endif

    switch ( morse_state )      //Use a switch to select the code for the current state
    {

    case BUSY_STATE :

        switch ( event )        //Now have a switch for each event which might happen in this busy state
        {

        case DOT_EVENT :        //Store the dot here
            break ;

        case DASH_EVENT :       //Store the dash here
            break ;

        case SPACE_EVENT :      //Work out the code and move to QUIET state
            morse_state = QUIET_STATE ;
            break ;

        case STUCK_EVENT :      //Go to quiet state
            morse_state = QUIET_STATE ;
        }

    case QUIET_STATE :          //Now handle events in quiet state

        switch ( event )
        {

        case DOT_EVENT :        //Store the dot here move to BUSY state
            morse_state = BUSY_STATE ;
            break ;

        case DASH_EVENT :       //Store the dash here move to BUSY state
            morse_state = BUSY_STATE ;
            break ;

        case SPACE_EVENT :      //Do nothing
            break ;

        case STUCK_EVENT :      //Do nothing
            break ;
        }
    }

#ifdef DEBUG
    lcd_print_ch ( morse_state ) ;
#endif

}





int main (void)
{
    unsigned char i ;

    setup_hardware();
    lcd_start();

    for ( i = 0; test_sequence[i] != 0; i = i + 1 )
    {
        do_morse(test_sequence[i]);
    }

    while (1) ;

    return 0;
}