// CONFIG
#pragma config FOSC = INTOSCIO  // Oscillator Selection bits (INTRC oscillator; port I/O function on both RA6/OSC2/CLKO pin and RA7/OSC1/CLKI pin)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable bit (PWRT enabled)
#pragma config MCLRE = ON       // RA5/MCLR/VPP Pin Function Select bit (RA5/MCLR/VPP pin function is MCLR)
#pragma config BOREN = OFF      // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF        // Low-Voltage Programming Enable bit (RB3/PGM pin has digital I/O function, HV on MCLR must be used for programming)
#pragma config CPD = OFF        // Data EE Memory Code Protection bit (Code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off)
#pragma config CCPMX = RB2      // CCP1 Pin Selection bit (CCP1 function on RB2)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include <xc.h>

#define _XTAL_FREQ 8000000 // 8MHz

#define TIMER_COUNT 200

#define AIN PORTAbits.RA0
#define VREF 5000

// LEDの点灯パターン
int pattern[] =
{
    0b10000000,     // 0
    0b11110010,     // 1
    0b01001000,     // 2
    0b01100000,     // 3
    0b00110010,     // 4
    0b00100100,     // 5
    0b00000100,     // 6
    0b10110000,     // 7
    0b00000000,     // 8
    0b00100000,     // 9
    0b00010000,     // A
    0b00000110,     // B
    0b10001100,     // C
    0b01000010,     // D
    0b00001100,     // E
    0b00011100,     // F
};

static int no;
static volatile int llseg = 0, lrseg = 0, rlseg = 0, rrseg = 0, sel = 0;
unsigned int adin;
float temper, sensv;
int tm;

// 割り込みエントリ
void __interrupt() isr(void)
{
    if (INTCONbits.TMR0IF) // TMR0
    {
        switch(sel)
        {
            case 0:
                PORTAbits.RA7 = 0;
                PORTB = pattern[rrseg];
                PORTAbits.RA1 = 1;
                break;
            case 1:
                PORTAbits.RA1 = 0;
                PORTB = pattern[rlseg];
                PORTAbits.RA4 = 1;
                break;
            case 2:
                PORTAbits.RA4 = 0;
                PORTB = pattern[lrseg];
                PORTAbits.RA6 = 1;
                break;
            case 3:
                PORTAbits.RA6 = 0;
                PORTB = pattern[llseg];
                PORTAbits.RA7 = 1;
                break;
        }

        if(++sel == 4)
            sel = 0;
 
        INTCONbits.TMR0IF = 0; // 割り込みフラグクリア
        TMR0 = TIMER_COUNT; // タイマ設定
    }
}

void htod(int hx, int* h, int* l)
{
    *h = hx / 10;
    *l = hx - *h * 10;
}

void main(void)
{
    OSCCON = 0b01110000; // 周波数8MHz
    ADCON0 = 0;
    ADCON1 = 0b11001110; // RA0のみアナログ
    TRISA  = 0b00000001; // RA0入力
    TRISB  = 0b00000000; // 全て出力
    PORTA  = 0b00000000; // 全てLOWにする
    PORTB  = 0b00000000; // 全てLOWにする
    
    OPTION_REGbits.T0CS = 0; // TMR0クロックソースは内部クロック
    OPTION_REGbits.PSA = 0; // プリスケーラをTMR0へ割り当て
    OPTION_REGbits.PS = 0b111; // プリスケーラ256
    no = 0;
    
    TMR0 = TIMER_COUNT;
    INTCONbits.TMR0IE = 1; // TMR0割り込みを許可
    INTCONbits.GIE = 1; // すべての割り込み許可
    
    __delay_ms(100);
    
    while (1)
    {
        ADCON0 = 0b01000001; // RA0を選択
        __delay_us(20); // 充電待ち
        
        //ADコンバート
        GO = 1; // AD変換開始
        while(GO); // AD変換終了待ち
        adin = ADRESH;
        adin <<= 8;
        adin |= ADRESL;
        
        //温度に変換
        sensv = (float)adin * VREF / 1024.0;
        temper = (sensv - 500.0) / 10.0;
        
        tm = temper; // 整数部
        htod(tm, &llseg, &lrseg);
        tm = (temper - tm) * 100; // 少数2桁
        htod(tm, &rlseg, &rrseg);

        __delay_ms(1000);
    }
    
    return;
}