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58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
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/*! \file pwmsw.h \brief Software interrupt-driven multi-output PWM function library. */
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//*****************************************************************************
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//
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// File Name : 'pwmsw.h'
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// Title : Software interrupt-driven multi-output PWM function library
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// Author : Pascal Stang - Copyright (C) 2002
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// Created : 7/20/2002
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// Revised : 7/31/2002
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// Version : 0.1
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// Target MCU : Atmel AVR Series
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// Editor Tabs : 4
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//
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// WARNING: this PWM library does not work perfectly. It has known and
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// understood problems when two or more PWM outputs are set to nearly the
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// same duty cycle. IT MAY NOT BE WORTH USING! YOU HAVE BEEN WARNED!
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#ifndef PWMSW_H
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#define PWMSW_H
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#include "global.h"
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#include "timer.h"
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// constants/macros/typdefs
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typedef struct struct_SwPwmChannel
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{
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u08 port; ///< channel's hardware I/O port
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u08 pin; ///< channel's hardware I/O pin
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u16 duty; ///< active PWM duty setting
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u16 setduty; ///< requested PWM duty setting
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} SwPwmChannelType;
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// number of PWM channels
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#define SWPWM_NUM_CHANNELS 3
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// define port
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#define SWPWMPORT PORTB
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#define SWPWMDDR DDRB
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// functions
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//! initializes software PWM system
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void pwmswInit(u16 periodTics);
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//! turns off software PWM system
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void pwmswOff(void);
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//! set duty on channel
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void pwmswPWMSet(u08 channel, u16 duty);
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//! software PWM interrupt service routine
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void pwmswService(void);
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#endif
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