Cantafford
Member
Hello,
Using the CCP1 module of the PIC18f2580 I'm trying to send some PWM pulses on the CCP1 pin. I have put an led on it so I can check the voltage across it(simulation software not hardware).
The program is supposed to do the following:
-when no buttons are pressed no votlage across the LED
-while first is pressed 25% PWM duty cycle
-while second is pressed 50%
- third - 75%
-forth - 100%
I have wrote the following program:
This is the header file where the configuration bits are:
I have the following problem:
Whenever I push a button I will have some voltage across the LED but no matter what button I press the same voltage will be there. There should be 25, 50, 75 and 100% DC values but only 1 voltage is there for all the presses.
Please let me know what am I doing wrong. Thank you.
Using the CCP1 module of the PIC18f2580 I'm trying to send some PWM pulses on the CCP1 pin. I have put an led on it so I can check the voltage across it(simulation software not hardware).
The program is supposed to do the following:
-when no buttons are pressed no votlage across the LED
-while first is pressed 25% PWM duty cycle
-while second is pressed 50%
- third - 75%
-forth - 100%
I have wrote the following program:
Code:
/*
* File: pwm.c
* Author: Paul
*
* Created on November 20, 2015, 1:22 PM
*/
#include <stdio.h>
#include <stdlib.h>
#include "pwm.h"
void main()
{
OSCCON = 0b00101110; // internal freq is 250khz
T2CON = 0b00000101; // TMR2 prescaler is 4
PR2 = 56/100; // pr is 0.56
// int pwm8msb = {0b00000000, 0b00000110, 0b00001100, 0b00010010, 0b00011001}; CCPR1L
// int pwm2lsb = {0b00, 0b01, 0b10, 0b11, 0b00}; DC1B1 and DC1B0
int i = 0, j=0;
TRISCbits.RC2 = 0; // led is here
TRISB = 1; // buttons are here
// DC1B1:DC1B0 the two LSbs (bit 1 and bit 0) of the 10-bit PWM duty cycle
CCP1M3 = 1; // CCP1 configured for PWM mode
CCP1M2 = 1;
CCP1M1 = 0;
CCP1M0 = 0;
while(1)
{
while(PORTBbits.RB0==1 && PORTBbits.RB1 == 1 && PORTBbits.RB2 == 1 && PORTBbits.RB3 == 1) // no voltage%
{
CCPR1L = 0b00000000;
DC1B1 = 0;
DC1B0 = 0;
}
while(PORTBbits.RB0==0 && PORTBbits.RB1 == 1 && PORTBbits.RB2 == 1 && PORTBbits.RB3 == 1) // 25%
{
CCPR1L = 0b00000110;
DC1B1 = 0;
DC1B0 = 1;
}
while(PORTBbits.RB0==1 && PORTBbits.RB1 == 0 && PORTBbits.RB2 == 1 && PORTBbits.RB3 == 1) // 50%
{
CCPR1L = 0b00001100;
DC1B1 = 1;
DC1B0 = 0;
}
while(PORTBbits.RB0==1 && PORTBbits.RB1 == 1 && PORTBbits.RB2 == 0 && PORTBbits.RB3 == 1) // 75%
{
CCPR1L = 0b00010010;
DC1B1 = 1;
DC1B0 = 1;
}
while(PORTBbits.RB0==1 && PORTBbits.RB1 == 1 && PORTBbits.RB2 == 1 && PORTBbits.RB3 == 0) // 100%
{
CCPR1L = 0b00011001;
DC1B1 = 0;
DC1B0 = 0;
}
}
}This is the header file where the configuration bits are:
Code:
/*
* File: pwm.h
* Author: Paul
*
* Created on November 20, 2015, 1:20 PM
*/
// PIC18F2580 Configuration Bit Settings
// 'C' source line config statements
#include <xc.h>
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
// CONFIG1H
#pragma config OSC = IRCIO67 // Oscillator Selection bits (Internal oscillator block, port function on RA6 and RA7)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = BOHW // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled))
#pragma config BORV = 3 // Brown-out Reset Voltage bits (VBOR set to 2.1V)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)
// CONFIG3H
#pragma config PBADEN = OFF // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)
#pragma config LPT1OSC = OFF // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = OFF // MCLR Pin Enable bit (RE3 input pin enabled; MCLR disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled)
#pragma config BBSIZ = 1024 // Boot Block Size Select bit (1K words (2K bytes) boot block)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000800-001FFFh) 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 (000000-0007FFh) 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 (000800-001FFFh) 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 (000000-0007FFh) 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 (000800-001FFFh) 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 (000000-0007FFh) not protected from table reads executed in other blocks)
#define _XTAL_FREQ 250000I have the following problem:
Whenever I push a button I will have some voltage across the LED but no matter what button I press the same voltage will be there. There should be 25, 50, 75 and 100% DC values but only 1 voltage is there for all the presses.
Please let me know what am I doing wrong. Thank you.
