48 lines
2 KiB
C
48 lines
2 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __PWM_X1000_H__
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#define __PWM_X1000_H__
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/* Usage:
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* - There are 5 PWM channels (0-4) corresponding to TCUs 0-4
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* - Call pwm_init(n) before using channel n
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* - Call pwm_set_period() to change the period and duty cycle at any time
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* - Call pwm_enable() and pwm_disable() to turn the output on and off
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* - Don't allow two threads to control the same channel at the same time
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* - Don't call pwm_init(), pwm_enable(), or pwm_disable() from an interrupt
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*
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* After calling pwm_init(), the channel is essentially in a disabled state so
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* you will need to call pwm_set_period() and then pwm_enable() to turn it on.
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* Don't alter the channel's TCU or GPIO pin state after calling pwm_init().
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*
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* After calling pwm_disable(), it is safe to use the channel's TCU or GPIO pin
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* for some other purpose, but you must call pwm_init() before you can use the
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* channel as PWM output again.
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*/
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extern void pwm_init(int chn);
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extern void pwm_set_period(int chn, int period_ns, int duty_ns);
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extern void pwm_enable(int chn);
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extern void pwm_disable(int chn);
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#endif /* __PWM_X1000_H__ */
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