/*******************************************************************
 * Processor:       PIC18F4520
 * Compiler:        MPLAB C18
 *
 * This file does the following....
 *
 * Author (Your name here)
 ********************************************************************/

/** Header Files ***************************************************/
#include <p18f4520.h>
#include <stdio.h>
#include <adc.h>
#include <timers.h>
#include <pwm.h>

/** Configuration Bits *********************************************/
#pragma config OSC = INTIO67
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config BOREN = OFF
#pragma config XINST = OFF

/** Define Constants Here ******************************************/
#define PRESSED 0
#define TICKS_FOR_300HZ 103
#define TICKS_FOR_500HZ 62
#define TICKS_FOR_700HZ 44
// If they used 4 MHz the numbers would've been
//#define TICKS_FOR_300HZ 207
//#define TICKS_FOR_500HZ 124
//#define TICKS_FOR_700HZ 88
#define VOLUME 102
#define NO_VOLUME 0


/*******************************************************************
 * Function:        void main(void)
 ********************************************************************/
#pragma code

void main(void) {
    // Set the clock to 2 MHz
    OSCCONbits.IRCF2 = 1;
    OSCCONbits.IRCF1 = 0;
    OSCCONbits.IRCF0 = 1;

    // Pin IO Setup
    OpenADC(ADC_FOSC_8 & ADC_RIGHT_JUST & ADC_12_TAD,
            ADC_CH0 & ADC_INT_OFF & ADC_REF_VDD_VSS,
            0x0B); // Four analog pins
    TRISA = 0xFF; // All of PORTA input
    TRISB = 0xFF; // All of PORTB input
    TRISC = 0x00; // All of PORTC output
    TRISD = 0x00; // All of PORTD output
    PORTC = 0x00; // Turn off all 8 Port C outputs

    OpenTimer2(TIMER_INT_OFF & T2_PS_1_16);
    OpenPWM1(TICKS_FOR_300HZ); // Optional
    SetDCPWM1(NO_VOLUME);
    while (1) {
        if (PORTBbits.RB2 == PRESSED) {
            OpenPWM1(TICKS_FOR_700HZ);
            SetDCPWM1(VOLUME);
        } else if (PORTBbits.RB1 == PRESSED) {
            OpenPWM1(TICKS_FOR_500HZ);
            SetDCPWM1(VOLUME);
        } else if (PORTBbits.RB0 == PRESSED) {
            OpenPWM1(TICKS_FOR_300HZ);
            SetDCPWM1(VOLUME);
        } else {
            SetDCPWM1(NO_VOLUME);
        }
    }
}