//-----------------------------------------------------------------------------
// Note
//  ドアの侵入検知
//  PICの周波数を32Mhzに設定
//-----------------------------------------------------------------------------
#include <xc.h>
#include <stdio.h>
#include <stdlib.h>

#define _XTAL_FREQ 32000000

// コンフィグレーションBIT1 設定
#pragma config FOSC = INTOSC    // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF       // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable (PWRT enabled)
#pragma config MCLRE = OFF      // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#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 = OFF      // Brown-out Reset Enable (Brown-out Reset disabled)
#pragma config CLKOUTEN = OFF   // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
#pragma config IESO = OFF       // Internal/External Switchover (Internal/External Switchover mode is disabled)
#pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is disabled)

// コンフィグレーションBIT2 設定
#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 = HI        // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), high trip point selected.)
#pragma config LVP = OFF        // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming)

// 点灯IOの定義
#define LED_GREEN   RA0
#define LED_RED     RA1
#define LED_YELLOW  RA2
#define CHECK_SW    RA5
#define DOOR_SW     RA4

// IOの状態を定義
#define SW_ON   0
#define SW_OFF  1
#define LED_ON  1
#define LED_OFF 0


int main(int argc, char** argv)
{
    short step = 0;
    short now_sw = 0;
    short old_sw = 0;
    short count = 0;

    OSCCON = 0b01110000 ;    // 内部クロック8ＭＨｚ

    OPTION_REG = 0b00000000 ;// 7bit目が0でプルアップ抵抗が有効
    ANSELA = 0b00000000 ;    // すべてデジタルI/Oに割当てる
    TRISA  = 0b00111000 ;    // RA3,4,5を入力とする
    WPUA   = 0b00110000 ;    // RA4,5をプルアップ抵抗設定
    PORTA  = 0b00000000 ;    // ピン状態初期化

    for(;;)
    {

        now_sw = DOOR_SW;

        switch(step)
        {
            case 0:
                // 電源ON後 一定時間無効
                LED_GREEN = LED_ON;
                __delay_ms(5000);
                old_sw = now_sw;
                step = 1;
                break;

            case 1:
                // ドア開のチェック
                if( (now_sw == SW_OFF) && (now_sw != old_sw) )
                {
                    __delay_ms(1000);    // チャタリング防止
                    count++;
                }
                break;
        }

        // 状態表示
        if( (step == 1) && (CHECK_SW == SW_ON) )
        {
            if(count<2)
            {
                LED_GREEN = LED_ON;
                LED_RED   = LED_OFF;
            }
            else
            {
                LED_GREEN = LED_OFF;
                LED_RED   = LED_ON;
            }
        }
        else
        {
            LED_GREEN = LED_OFF;
            LED_RED   = LED_OFF;
        }

        // ドアのIO状態
        if( DOOR_SW == SW_ON )
            LED_YELLOW = LED_ON;
        else
            LED_YELLOW = LED_OFF;

        old_sw = now_sw;
    }

    return (EXIT_SUCCESS);
}