Lý thuyết về ADC và PWM các bạn xem lại các bài đăng trước (ADC bài 22, PWM bài 27).
- Đây là ảnh mô phỏng protues.
- Đây là code chương trình.
#include <stdio.h>
#include <stdlib.h>
#include <xc.h>
#include "pwm.h"
#define _XTAL_FREQ 4000000
// CONFIG
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
void PWM(void);
void ADCinit (void);
unsigned int ReadADC (void);
unsigned int ADCvalue = 0;
unsigned int duty=0;
void main(void)
{
ADCinit();
PWM();
while(1)
{
ADCvalue = ReadADC();
duty = (ADCvalue/1023.0)*100.0;//while
PWM1_Duty(duty);
}
}
void PWM(void)//ham khai bao pwm
{
PWM1_Init_Fre(1000);
PWM1_Duty(duty);//while
PWM1_Start();
}
void ADCinit (void)// adc
{
// chon tan so clock cho bo adc
ADCON1bits.ADCS2 = 0, ADCON0bits.ADCS1 = 0,ADCON0bits.ADCS0 = 1;
// chon kenh adc la kenh an0
ADCON0bits.CHS2 = 0, ADCON0bits.CHS1 = 0, ADCON0bits.CHS0 = 0;
// chon cach luu data
ADCON1bits.ADFM = 1;
// cau hinh cong vao
ADCON1bits.PCFG3 = 1, ADCON1bits.PCFG2 = 1, ADCON1bits.PCFG1 = 1, ADCON1bits.PCFG0 = 0;
// cap nguon cho khoi adc
ADCON0bits.ADON = 1;
}
unsigned int ReadADC (void)// doc len 7 doan
{
unsigned int TempValue = 0;
ADCON0bits.GO_nDONE = 1;
while(ADCON0bits.GO_nDONE);
TempValue = ADRESH*256 + ADRESL;
return (TempValue);
}
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