epwm1.c

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/*
    (c) 2018 Microchip Technology Inc. and its subsidiaries. 
    
    Subject to your compliance with these terms, you may use Microchip software and any 
    derivatives exclusively with Microchip products. It is your responsibility to comply with third party 
    license terms applicable to your use of third party software (including open source software) that 
    may accompany Microchip software.
    
    THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER 
    EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY 
    IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS 
    FOR A PARTICULAR PURPOSE.
    
    IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, 
    INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND 
    WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP 
    HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO 
    THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL 
    CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT 
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*/
 
#include <xc.h>
#include "epwm1.h"
 
#define PWM1_INITIALIZE_DUTY_VALUE    511
 
void EPWM1_Initialize(void)
{
    // Set the EPWM1 to the options selected in the User Interface
    
    // CCP1M P1A,P1C: active high; P1B,P1D: active high; DC1B 3; P1M single; 
    CCP1CON = 0x3C;    
    
    // ECCPASE operating; PSSBD P1BP1D_0; PSSAC P1AP1C_0; ECCPAS disabled; 
    ECCP1AS = 0x00;    
    
    // P1RSEN automatic_restart; P1DC0 0; 
    ECCP1DEL = 0x80;    
    
    // CCPR1H 0; 
    CCPR1H = 0x00;    
    
    // CCPR1L 127; 
    CCPR1L = 0x7F;    
 
}
 
void EPWM1_LoadDutyValue(uint16_t dutyValue)
{
   // Writing to 8 MSBs of pwm duty cycle in CCPRL register
    CCPR1L = ((dutyValue & 0x03FC)>>2);
    
   // Writing to 2 LSBs of pwm duty cycle in CCPCON register
    CCP1CON = ((uint8_t)(CCP1CON & 0xCF) | ((dutyValue & 0x0003)<<4));
}