Lab1Ex4.c

//0. INFORMATION & NOTES______________________________________________________________________________

    /////////////////////////
    // Lab assessment ME II /
    // Name: Thomas Hollis  /
    // Student ID: 9563426  /
    // Lab No. 1	    /
    // Exercise No. 4	    /
    /////////////////////////

    //Port A: Analogue inputs from the rotary potentiometer (RA0), the LM335Z temperature sensor (RA1) and the Light Dependent Resistor (RA2). Digital output to control the LED transistor Q3 (RA4). 5V closed, 0V open.
    //Port B: Push-button PB1 digital input (RB0).
    //Port C: Toggle switch digital inputs (RC2, RC3, RC4 and RC5). Least significant.
    //Port F: Digital outputs to control 8 LEDs and 7seg displays (RF0 ? RF7). Write 0V to illuminate.
    //Port H: Digital outputs to control 7-segment transistors Q1 and Q2 (RH0 and RH1). 0V closed, 5V open. Toggle switch digital inputs (RH4, RH5, RH6 and RH7). Most significant.
    //Port J: Push-button PB1 digital input (RJ5). Digital output for controlling the sounder (RJ6).
    //7seg - 0:132, 1:245, 2:76, 3:100, 4:53, 5:38, 6:6, 7:244, 8:4, 9:36, A:20, B:7, C:142, D:132, E:14, F:30

//1. PREPROCESSOR DIRECTIVES__________________________________________________________________________
    #include "xc_config_settings.h"
    #include "delays.h"

//2. DEFINITIONS______________________________________________________________________________________
    //#define PI 3.1415926
    //#define E 2.71828182846
    //#define E0 0.00000000000885

//TO CHANGE DURING LAB
    #define HEX0 4                                                              //8 - change to any symbol
    #define HEX1 36                                                             //9 - change to any symbol
    #define HEX2 20                                                             //A - change to any symbol
    #define HEX3 7                                                              //B - change to any symbol

//3. FUNCTIONS________________________________________________________________________________________
unsigned char read_S1(void) {
    unsigned char x;
    TRISC=0xFF;
    x = PORTC >> 2;
    return x;
}

unsigned char read_S2(void) {
    unsigned char x;
    TRISH=0xF0;
    x = PORTH >> 4;
    return x;
}

void display_on_U1 (unsigned int value){
	LATH = 0b11111110;                                                      //swap this to start on different screen
	LATF = value;
}

void display_on_U2 (unsigned int value){
	LATH = 0b11111101;
	LATF = value;
}

unsigned char PB1_pressed(void){
	return (!PORTJbits.RJ5);
}

unsigned char PB2_pressed(void){
	return (!PORTBbits.RB0);
}

//4. MAIN_____________________________________________________________________________________________
void main (void) {
    //4.1. Configuration of I/O
    ADCON1 = 0x0F; // enable digital I/O

    TRISC = 0b00111100; // Port C bits all inputs - C2-C5 are switches 0-3
    TRISH = 0b11110000; // Port H bits all inputs - H4-H7 are switches 4-7

    TRISF = 0x00; // Port F output - LEDs/7seg display

    TRISA = 0x00; //LED transistor enable
    LATA = 0b00010000; //LED transistor enable

    //4.2. Read & Display
    int patterns[4] = {HEX0, HEX1, HEX2, HEX3};
    unsigned char switch_bank, x, y, z; //variable declarations

    x = 0;

    while (1){
        switch_bank = read_S1();                                                //change this to s2 if required

        if (PB1_pressed() == 1){
            x++;
            Delay10KTCYx(65);
        }

        switch(switch_bank){
            case 1:
                if(x%2 == 0){
                    display_on_U1(patterns[0]);
                }
                else {
                    display_on_U2(patterns[0]);
                }
                break;
            case 2:
                if(x%2 == 0){
                    display_on_U1(patterns[1]);
                }
                else {
                    display_on_U2(patterns[1]);
                }
                break;
            case 4:
                if(x%2 == 0){
                    display_on_U1(patterns[2]);
                }
                else {
                    display_on_U2(patterns[2]);
                }
                break;
            case 8:
                if(x%2 == 0){
                    display_on_U1(patterns[3]);
                }
                else {
                    display_on_U2(patterns[3]);
                }
                break;
            default:
                LATH = 0b11111111;
                LATF = 0b11111111;
         }
    }
}

//6. DEBUG STATUS_________________________________________________________________________________
//debugged