微算機 lab10

tags: microcontroller lab

題目
連結可能失效！！！

/* 
 * File:   lab10.c
 * Author: mickeytseng
 *
 * Created on December 8, 2020, 10:46 PM
 */

#include <xc.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <pic18f4520.h>

#pragma config OSC = INTIO67 // Oscillator Selection bits
#pragma config WDT = OFF     // Watchdog Timer Enable bit 
#pragma config PWRT = OFF    // Power-up Enable bit
#pragma config BOREN = ON   // Brown-out Reset Enable bit
#pragma config PBADEN = OFF     // Watchdog Timer Enable bit 
#pragma config LVP = OFF     // Low Voltage (single -supply) In-Circute Serial Pragramming Enable bit
#pragma config CPD = OFF     // Data EEPROM　Memory Code Protection bit (Data EEPROM code protection off)

#define _XTAL_FREQ 4000000



void main(void) {
    /*
    // 設定TIMER2, prescaler為4
    T2CON = 0b01111101;

    // 設定OSC頻率，Fosc為125k = Tosc為8µs
    OSCCONbits.IRCF = 0b001;
    
    // 設定CCP1
    CCP1CONbits.CCP1M = 0b1100;
    
    // 將RC2設定為輸出，並初始化(因為CCP1和RC2是同一個port)
    TRISC = 0;
    LATC = 0;
    
    // 設定pr2和ccp的數字來調整輸出的PWM週期和Duty Cycle
    // period = (PR2+1)*4*Tosc*(TMR2 prescaler) = (0x9b + 1) * 4 * 8µs * 4 = 0.019968s ~= 20ms
    PR2 = 0x9b;
    // duty cycle = (CCPR1L:CCP1CON<5:4>)*Tosc*(TMR2 prescaler) = (0x0b*4 + 0b01) * 8µs * 4 = 0.00144s ~= 1450µs
    CCPR1L = 0x0b;
    CCP1CONbits.DC1B = 0b01;
    // Demo時需要向TAs解釋如何設定Tosc和PR2以及CCPR1L和CCP1CON，並且計算出如何得到週期20ms以及duty cycle的500µs和2400µs。
    return;
    */
    
    //set clock to 4 MHz
    OSCCONbits.IRCF = 0b110;
    
    //set RD as output
    TRISD = 0;
    LATD = 0;
    
    //set RA0 as input
    TRISA = 0b00000001;
    PORTA = 0;
    LATA = 0;
    
    //set AN0 as analog input
    ;ADCON1bits.PCFG = 0b1110;
    ADCON0bits.CHS = 0b0000;
    
    //set Vref- and Vref+ as Vss and Vdd
    ADCON1bits.VCFG1 = 0;
    ADCON1bits.VCFG0 = 0;
    
    //set A/D on
    ADCON0bits.ADON = 1;
    
    //set Tad ADCS as 4Tosc
    ADCON2bits.ADCS = 0b100;
            
    //set TACQ to 4Tad
    ADCON2bits.ACQT = 0b010;
    
    //set Right justified
    ADCON2bits.ADFM = 1;
    
    //Clear ADIF 
    PIR1bits.ADIF = 0;
    
    //Set ADIE
    PIE1bits.ADIE = 1;
    
    //Set GIE
    INTCONbits.GIE = 1;
    INTCONbits.PEIE = 1;
    
    //configure ADIP
    IPR1bits.ADIP = 1;
    
    ADCON0bits.GODONE = 1;
    __delay_us(4);
    while(1){
       
    }
    
}

void __interrupt(high_priority) ADC_ISR (){
    unsigned int number = 0;
    number = number | ADRESH;
    number = number << 8;
    number = number | ADRESL;
    unsigned char i = 0;
    while(number > 68){
        number -= 68;
        i++;
    }
    LATD = i;
    PIR1bits.ADIF = 0;
    ADCON0bits.GODONE = 1;
    __delay_us(4);
}