第3回 PWM制御（２）〜PWM制御プログラムを作成する〜

while(1){
    LEDを点灯する;
    0.0025秒待つ;
    LEDを消灯する;
    0.0025秒待つ;
}

while(1){
    LATA5 = 1;
    __delay_ms(???);
    LATA5 = 0;
    __delay_ms(???);
}

while(1){
    LATA5 = 1;
    __delay_ms(2.5);
    LATA5 = 0;
    __delay_ms(2.5);
}

while(1){
    LATA5 = 1;
    __delay_us(2500);
    LATA5 = 0;
    __delay_us(2500);
}

/*
 * File:   main.c
 */
#include <xc.h>

// PIC12F1822 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 disabled)
#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 = 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)
// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config PLLEN = OFF      // PLL Enable (4x PLL disabled)
#pragma config STVREN = OFF     // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will not 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)


// クロック周波数指定
// __delay_ms(), __delay_us()関数が使用する
#define _XTAL_FREQ 1000000

void main(void) {

    // PICマイコン設定
    OSCCON = 0b01011010;  // 内部クロック周波数を1MHzに設定
    ANSELA = 0b00000000;  // すべてのピンをデジタルモードに設定
    TRISA  = 0b00001000;  // すべてのピンを出力モードに設定(ただしRA3ピンは常に入力モード)

    // LED PWM制御 (デューテー比50%)
    while(1){
        // LEDを2.5ms点灯
        LATA5 = 1;
        __delay_us(2500);
        // LEDを2.5ms消灯
        LATA5 = 0;
        __delay_us(2500);            
    }

    // 以下の命令は実行されない
    return;

}

    // LED PWM制御 (デューテー比10%)
    while(1){
        // LEDを0.5ms点灯
        LATA5 = 1;
        __delay_us(500);
        // LEDを4.5ms消灯
        LATA5 = 0;
        __delay_us(4500);            
    }

/*
 * PICマイコン電子工作入門 応用編 第3回
 * ミニチャレンジ課題1 解答例
 */

#include <xc.h>


// PIC12F1822 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 disabled)
#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 = 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)
// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config PLLEN = OFF      // PLL Enable (4x PLL disabled)
#pragma config STVREN = OFF     // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will not 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)

// クロック周波数指定
// __delay_ms()関数が使用する
#define _XTAL_FREQ 1000000

void main(void) {

    // PICマイコン設定
    OSCCON = 0b01011000;  // 内部クロック周波数を1MHzに設定
    ANSELA = 0b00000000;  // すべてのピンをデジタルモードに設定
    TRISA  = 0b00001000;  // すべてのピンを出力モードに設定(ただしRA3ピンは常に入力モード)

    while(1) {

        // 1秒間80%の明るさで点灯
        for(uint8_t i=0; i<200; i++) {
            LATA5 = 1;
            __delay_ms(4);
            LATA5 = 0;
            __delay_ms(1);
        }

        // 1秒間20%の明るさで点灯
        for(uint8_t i=0; i<200; i++) {
            LATA5 = 1;
            __delay_ms(1);
            LATA5 = 0;
            __delay_ms(4);
        }

    }
    
    // 以下の命令は実行されない
    return;
}