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// <editor-fold defaultstate="collapsed" desc="Configuration Bits">
// PIC16F1825 Configuration Bit Settings

// CONFIG1
#pragma config FOSC = INTOSC    // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF       // Watchdog Timer Enable (WDT enabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = OFF      // MCLR Pin Function Select (MCLR/VPP pin function is digital input)
#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 = ON        // Internal/External Switchover (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is enabled)

// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config PLLEN = ON       // PLL Enable (4x PLL enabled)
#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)
// </editor-fold>

#include "defines.h"
#include "INTERRUPTS.h"
#include "STEPPER.h"
#include "IOC.h"
#include "SPI.h"
#include "OLED_SSD1306.h"

void Pins_Init(void) {
    // RA0 and RA1 pins as analog input
    ANSELA = 0x3;
    ANSELC = 0x0;

//    // Enable weak pull-up if WPU bit is set
//    OPTION_REGbits.nWPUEN = 0;

    // SDO1 on RC2
    APFCON0bits.SDOSEL = 0;

    STEP_TRIS = 0;
    STEP_LAT = 0;

    M0_TRIS = 0;
    M0_LAT = 0;

    M1_TRIS = 0;
    M1_LAT = 0;

    M2_TRIS = 0;
    M2_LAT = 0;

    SW_1_TRIS = 1;
    SW_1_INLVL = 1;

    SW_2_TRIS = 1;
    SW_2_INLVL = 1;

    STEP_CURRENT_TRIS = 1;
    POT_CURRENT_TRIS = 1;

    SPI_MOSI_TRIS = 0;
    SPI_CLK_TRIS = 0;
    SPI_DC_SELECT_TRIS = 0;
    SPI_DC_SELECT_LAT = 0;
    SPI_RESET_TRIS = 0;
    SPI_RESET_LAT = 0;
}

OPERATING_MODE currMode;

int main(void) {
    // Set internal oscillator speed to 32MHz
    OSCCONbits.SPLLEN = 1;  // 4x PLL enable (overwritten by config bits)
    OSCCONbits.IRCF = 0xE;  // Base frequency @ 8MHz
    OSCCONbits.SCS = 0b00;  // System clock determined by config bits

    // Initialize I/O
    Pins_Init();

    IOC_Init();

    SPI_DATA spi_data;
    SPI_Init(&spi_data, SPI2_FOSC_16);

    SSD1306_DATA ssd1306_data;
    SSD1306_Init(&ssd1306_data);

    Interrupt_Init();
    Interrupt_Enable();

    currMode = SINGLE_STEP;

    SSD1306_Begin(SSD1306_SWITCHCAPVCC);

    while(1) {

        Update_OLED();
        
        switch (STEPPER_Get_Auto()) {
            case DELAY_1000MS:
                STEPPER_Step();
                __delay_ms(1000);
                break;
            case DELAY_500MS:
                STEPPER_Step();
                __delay_ms(500);
                break;
            case DELAY_333MS:
                STEPPER_Step();
                __delay_ms(333);
                break;
            case DELAY_250MS:
                STEPPER_Step();
                __delay_ms(250);
                break;
            case DELAY_100MS:
                STEPPER_Step();
                __delay_ms(100);
                break;
            case DELAY_50MS:
                STEPPER_Step();
                __delay_ms(50);
                break;
            case DELAY_25MS:
                STEPPER_Step();
                __delay_ms(25);
                break;
            case DELAY_10MS:
                STEPPER_Step();
                __delay_ms(10);
                break;
            case DELAY_5MS:
                STEPPER_Step();
                __delay_ms(5);
                break;
            case DELAY_1MS:
                STEPPER_Step();
                __delay_ms(1);
                break;
            case DELAY_STOPPED:
                break;
        }
    }
}

void Set_Next_Mode() {
    switch (currMode) {
        case SINGLE_STEP:
            currMode = AUTO_STEP;
            break;
        case AUTO_STEP:
            currMode = SET_DELAY;
            break;
        case SET_DELAY:
            currMode = SET_MICROSTEP;
            break;
        case SET_MICROSTEP:
        default:
            currMode = SINGLE_STEP;
            break;
    }
}

OPERATING_MODE Get_Cur_Mode(void) {
    return currMode;
}

void Update_OLED(void) {
    SSD1306_Clear_Display();
    SSD1306_Set_Text_Size(2);
    SSD1306_Set_Text_Wrap(0);
    switch (currMode) {
        case SINGLE_STEP:
            Draw_Manual_Text(1);
            Draw_Auto_Text(0);
            Draw_Step_Text(STEPPER_Get_Cur_Step(), 0);
            Draw_Speed_Text(STEPPER_Get_Cur_Speed(), 0);
            break;
        case AUTO_STEP:
            Draw_Manual_Text(0);
            Draw_Auto_Text(1);
            Draw_Step_Text(STEPPER_Get_Cur_Step(), 0);
            Draw_Speed_Text(STEPPER_Get_Cur_Speed(), 0);
            break;
        case SET_DELAY:
            Draw_Manual_Text(0);
            Draw_Auto_Text(0);
            Draw_Step_Text(STEPPER_Get_Cur_Step(), 1);
            Draw_Speed_Text(STEPPER_Get_Cur_Speed(), 0);
            break;
        case SET_MICROSTEP:
            Draw_Manual_Text(0);
            Draw_Auto_Text(0);
            Draw_Step_Text(STEPPER_Get_Cur_Step(), 0);
            Draw_Speed_Text(STEPPER_Get_Cur_Speed(), 1);
            break;
    }
    SSD1306_Display();
}

void Draw_Manual_Text(uint8_t selected) {
    uint8_t stringManual[] = "MANUAL";
    if (selected) {
        SSD1306_Fill_Rect(0, 0, 75, 16, 1);
        SSD1306_Set_Text_Color(0);
    } else {
        SSD1306_Set_Text_Color(1);
    }
    SSD1306_Set_Cursor(3, 1);
    SSD1306_Write_String(stringManual, 6);
}

void Draw_Auto_Text(uint8_t selected) {
    uint8_t stringAuto[] = "AUTO";
    if (selected) {
        SSD1306_Fill_Rect(76, 0, 53, 16, 1);
        SSD1306_Set_Text_Color(0);
    } else {
        SSD1306_Set_Text_Color(1);
    }
    SSD1306_Set_Cursor(79, 1);
    SSD1306_Write_String(stringAuto, 4);
}

void Draw_Speed_Text(STEPPER_SPEED speed, uint8_t selected) {
    uint8_t stringSpeed[] = "1000Hz";
    if (selected) {
        SSD1306_Fill_Rect(53, 16, 76, 16, 1);
        SSD1306_Set_Text_Color(0);
    } else {
        SSD1306_Set_Text_Color(1);
    }
    SSD1306_Set_Cursor(55, 17);
    SSD1306_Write_String(stringSpeed, 6);
}

void Draw_Step_Text(STEPPER_MICROSTEP step, uint8_t selected) {
    uint8_t stringStepping[] = "1/32";
    if (selected) {
        SSD1306_Fill_Rect(0, 16, 52, 16, 1);
        SSD1306_Set_Text_Color(0);
    } else {
        SSD1306_Set_Text_Color(1);
    }
    SSD1306_Set_Cursor(2, 17);
    SSD1306_Write_String(stringStepping, 4);
}