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PIC18F4550_PWM.h
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PIC18F4550_PWM.h
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/*
* File: PIC18F4550_PWM
* Author: Yaw Awuah Darko
* Comments: May work on PIC18F2455/2550/4455 as well though not tested yet as at 24 Nov 2018
* Revision history: First release
*/
#include <xc.h>
#include <stdint.h>
void setupPWM(long ,int);
void PWM1_Set_Duty(uint16_t);
#define _XTAL_FREQ 8000000
#define PS_1 1
#define PS_4 4
#define PS_16 16
void setupPWM(long PWM_Hz,int T2PSS)
{
if(T2PSS == 1)
{
T2CKPS0 = 0;
T2CKPS1 = 0;
TMR2ON = 1;
if(PWM_Hz != 0)
{PR2 = (((1/PWM_Hz)/(4*(1/_XTAL_FREQ))) - 1);}
}
else if(T2PSS == 4)
{
T2CKPS0 = 1;
T2CKPS1 = 0;
TMR2ON = 1;
if(PWM_Hz != 0)
{PR2 = (((1/PWM_Hz)/(4*4*(1/_XTAL_FREQ))) - 1);}
}
else if(T2PSS == 16)
{
T2CKPS1 = 1;
TMR2ON = 1;
if(PWM_Hz != 0)
{PR2 = (((1/PWM_Hz)/(16*4*(1/_XTAL_FREQ))) - 1);}
}
CCP1M2 = 1;
CCP1M3 = 1;
}
void PWM1_Set_Duty(uint16_t dutycycle)
{
dutycycle = dutycycle * 10;
// Check The DC Value To Make Sure it's Within 10-Bit Range
if(dutycycle<1024)
{
DC1B0 = dutycycle & 1;
DC1B1 = dutycycle & 2;
CCPR1L = (dutycycle) >> 2;
}
}