f8d2984875
The current pwm interface is too low-level. Introduce a higher level setup function which directly computes the parameters from the required frequency. Change-Id: Ie95c7522e9f42492fe872203f4cab46770a9649a
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/***************************************************************************
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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) 2011 by Amaury Pouly
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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_IMX233_H__
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#define __PWM_IMX233_H__
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#include "system.h"
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#include "regs/regs-pwm.h"
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/* fake field for simpler programming */
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#define BP_PWM_CTRL_PWMx_ENABLE(x) (x)
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#define BM_PWM_CTRL_PWMx_ENABLE(x) (1 << (x))
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#define IMX233_PWM_MAX_PERIOD (1 << 16)
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#define IMX233_PWM_NR_CHANNELS 5
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void imx233_pwm_init(void);
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void imx233_pwm_setup(int channel, int period, int cdiv, int active,
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int active_state, int inactive, int inactive_state);
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/* helper function to compute adequate divisor and period, given a minimum
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* period resolution (for active/inactive) */
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void imx233_pwm_lookup_freq(int freq, int min_period, int *period, int *cdiv);
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/* simple setup with active 1, inactive 0, duty cycle in percent */
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void imx233_pwm_setup_simple(int channel, int freq, int duty_cycle);
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void imx233_pwm_enable(int channel, bool enable);
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bool imx233_pwm_is_enabled(int channel);
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struct imx233_pwm_info_t
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{
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bool enabled;
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int cdiv;
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int period;
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int inactive, active;
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char inactive_state, active_state; // '0', '1' or 'Z'
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};
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struct imx233_pwm_info_t imx233_pwm_get_info(int channel);
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#endif /* __PWM_IMX233_H__ */
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