#include "xc.h"
#include "numpad.h"
#include "display.h"

// CW1: FLASH CONFIGURATION WORD 1 (see PIC24 Family Reference Manual 24.1)
#pragma config ICS = PGx1          // Comm Channel Select (Emulator EMUC1/EMUD1 pins are shared with PGC1/PGD1)
#pragma config FWDTEN = OFF        // Watchdog Timer Enable (Watchdog Timer is disabled)
#pragma config GWRP = OFF          // General Code Segment Write Protect (Writes to program memory are allowed)
#pragma config GCP = OFF           // General Code Segment Code Protect (Code protection is disabled)
#pragma config JTAGEN = OFF        // JTAG Port Enable (JTAG port is disabled)


// CW2: FLASH CONFIGURATION WORD 2 (see PIC24 Family Reference Manual 24.1)
#pragma config I2C1SEL = PRI       // I2C1 Pin Location Select (Use default SCL1/SDA1 pins)
#pragma config IOL1WAY = OFF       // IOLOCK Protection (IOLOCK may be changed via unlocking seq)
#pragma config OSCIOFNC = ON       // Primary Oscillator I/O Function (CLKO/RC15 functions as I/O pin)
#pragma config FCKSM = CSECME      // Clock Switching and Monitor (Clock switching is enabled, 
// Fail-Safe Clock Monitor is enabled)
#pragma config FNOSC = FRCPLL      // Oscillator Select (Fast RC Oscillator with PLL module (FRCPLL))

#define NOKEY 255

void delay(long d) {
    for (d=d; d > 0; d--) {
        asm("nop");
    }
}
char cycle();


//============================================================================//

int main(void) {
    init7seg();
    initKeyPad();
    char key = 'N';
    char right, left;
    int debounce = 250;
    //RB<9:2> will drive the cathodes of the seven-segment display
    //RB<11:10> will drive the right and left anodes respectively
    //RA<3:0> will drive inputs of keypad
    //RB<15:12> will cycle to sense RA inputs
    while (1) {
        if (debounce == 0) {
            key = cycle();
            if (key != 'N') {
                left = right;
                right = key;
            }
            debounce = 250;
        }
        
        showChar7seg(right, MSB);
        delay(500);
        showChar7seg(left, LSB);
        delay(200);
        
        debounce--;
//        while (!IFS0bits.T1IF);
//        IFS0bits.T1IF = 0;
    }
}

char cycle() {
    int i = 0;
    char key = 'N';
    while (i < 4) {
        if (i == 0) {
            LATBbits.LATB12 = 0;
            LATBbits.LATB13 = 1;
            LATBbits.LATB14 = 1;
            LATBbits.LATB15 = 1;
        } else if (i == 1) {
            LATBbits.LATB12 = 1;
            LATBbits.LATB13 = 0;
            LATBbits.LATB14 = 1;
            LATBbits.LATB15 = 1;
        } else if (i == 2) {
            LATBbits.LATB12 = 1;
            LATBbits.LATB13 = 1;
            LATBbits.LATB14 = 0;
            LATBbits.LATB15 = 1;
        } else if (i == 3) {
            LATBbits.LATB12 = 1;
            LATBbits.LATB13 = 1;
            LATBbits.LATB14 = 1;
            LATBbits.LATB15 = 0;
        }
        key = readKeyPadRAW();
        if (key != 'N') {
            return key;
        }
        i++;
    }
    return key;
}