67 lines
2.8 KiB
C
67 lines
2.8 KiB
C
/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of libmc1322x: see http://mc1322x.devl.org
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* for details.
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*
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*
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*/
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#ifndef PWM_H
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#define PWM_H
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/* Initialize PWM output.
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timer_num = 0, 1, 2, 3
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rate = desired rate in Hz,
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duty = desired duty cycle. 0=always off, 65536=always on.
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enable_timer = whether to actually run the timer, versus just configuring it
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Returns actual PWM rate. */
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uint32_t pwm_init_ex(int timer_num, uint32_t rate, uint32_t duty, int enable_timer);
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/* Initialize PWM output, helper macros
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timer = TMR0, TMR1, TMR2, TMR2
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rate = desired rate in Hz,
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duty = desired duty cycle. 0=always off, 65536=always on.
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Returns actual PWM rate. */
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#define pwm_init(timer,rate,duty) pwm_init_ex(TMR_NUM(timer), rate, duty, 1)
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#define pwm_init_stopped(timer,rate,duty) pwm_init_ex(TMR_NUM(timer), rate, duty, 0)
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/* Change duty cycle. Safe to call at any time.
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timer_num = 0, 1, 2, 3
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duty = desired duty cycle. 0=always off, 65536=always on.
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*/
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void pwm_duty_ex(int timer_num, uint32_t duty);
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/* Change duty cycle. Safe to call at any time.
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timer = TMR0, TMR1, TMR2, TMR2
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duty = desired duty cycle. 0=always off, 65536=always on.
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*/
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#define pwm_duty(timer,duty) pwm_duty_ex(TMR_NUM(timer), duty)
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#endif
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