PWM with XC8 PIC18F452

Chào các bạn trong bài đăng này mình sẽ hướng dẫn các bạn về PWM trong PIC18F452.

Ảnh mô phỏng protues.

Đây là code chương trình.

#define _XTAL_FREQ 4000000
#include <xc.h>
#include "PWM.h"
// CONFIG1H
#pragma config OSC = XT         // Oscillator Selection bits (XT oscillator)
#pragma config OSCS = OFF       // Oscillator System Clock Switch Enable bit (Oscillator system clock switch option is disabled (main oscillator is source))

// CONFIG2L
#pragma config PWRT = OFF       // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF        // Brown-out Reset Enable bit (Brown-out Reset disabled)
#pragma config BORV = 20        // Brown-out Reset Voltage bits (VBOR set to 2.0V)

// CONFIG2H
#pragma config WDT = OFF        // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 128      // Watchdog Timer Postscale Select bits (1:128)

// CONFIG3H
#pragma config CCP2MUX = ON    // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)

// CONFIG4L
#pragma config STVR = OFF       // Stack Full/Underflow Reset Enable bit (Stack Full/Underflow will not cause RESET)
#pragma config LVP = OFF        // Low Voltage ICSP Enable bit (Low Voltage ICSP disabled)

// CONFIG5L
#pragma config CP0 = OFF        // Code Protection bit (Block 0 (000200-001FFFh) not code protected)
#pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) not code protected)
#pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) not code protected)
#pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) not code protected)

// CONFIG5H
#pragma config CPB = OFF        // Boot Block Code Protection bit (Boot Block (000000-0001FFh) not code protected)
#pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM not code protected)

// CONFIG6L
#pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000200-001FFFh) not write protected)
#pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) not write protected)
#pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) not write protected)
#pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) not write protected)

// CONFIG6H
#pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write protected)
#pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot Block (000000-0001FFh) not write protected)
#pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM not write protected)

// CONFIG7L
#pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000200-001FFFh) not protected from Table Reads executed in other blocks)
#pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from Table Reads executed in other blocks)
#pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from Table Reads executed in other blocks)
#pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from Table Reads executed in other blocks)

// CONFIG7H
#pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot Block (000000-0001FFh) not protected from Table Reads executed in other blocks)
unsigned int duty = 0;
void main (void)
{
    PWM2_Init_Fre(1000);// f 
    while(1){
        PWM2_Start();
        PWM2_Duty(duty);
        duty++;
        if(duty > 127) duty = 0;
        __delay_us(10);
    }
}
Code mình viết bị sai vài chỗ các bạn sữa lại cho đúng nha !
// CONFIG3H
#pragma config CCP2MUX = ON    // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)
sữa chỗ này lại giống như trên nha ! với trong phần code pwm.h các bạn tìm phần code giống zậy và sữa lại như này nha !
PWM1_Duty(unsigned int duty)
{
    duty = ((float)duty/100.0)*PWM_Max_Duty();
    DC1B1 = duty & 2;
    DC1B0 = duty & 1;
    CCPR1L = duty>>2;
}
PWM2_Duty(unsigned int duty)
{
    duty = ((float)duty/100.0)*PWM_Max_Duty();
    DC2B1 = duty & 2;
    DC2B0 = duty & 1;
    CCPR2L = duty>>2;

}
Với sữa trong void main lại như trên ! Bài đăng nha !

Link download project.
http://www.mediafire.com/download/c0jy0azb6l2iz71/PWM.rar

Share this

Author : Unknown

Related Posts