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bertos/drv/pwm.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ * \defgroup pwm_driver PWM driver
+ * \ingroup drivers
+ * \{
+ * \brief Pulse Width Modulation (PWM) driver.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ * $WIZ$ module_name = "pwm"
+ * $WIZ$ module_configuration = "bertos/cfg/cfg_pwm.h"
+ * $WIZ$ module_hw = "bertos/hw/pwm_map.h"
+ * $WIZ$ module_supports = "not avr and not cm3"
+ */
+
+#ifndef DRV_PWM_H
+#define DRV_PWM_H
+
+#include <cpu/attr.h>
+
+#include <cfg/compiler.h>
+#include "cfg/cfg_pwm.h"
+
+/**
+ * Maximum PWM duty cycle value (100%)
+ */
+#define PWM_MAX_DUTY              ((pwm_duty_t)0xFFFF)
+#define PWM_MAX_PERIOD                         0xFFFF
+#define PWM_MAX_PERIOD_LOG2                        16
+
+/**
+ * Type for PWM duty cycle.
+ * The value is represented as a 16bit unsigned integer, so it ranges from 0 (0%)
+ * to PWM_MAX_DUTY (0xFFFF = 100%).
+ */
+typedef uint16_t pwm_duty_t;
+
+/**
+ * Type for PWM frequency.
+ * Unit of measure is Hz.
+ */
+typedef uint32_t pwm_freq_t;
+
+#if !CFG_PWM_ENABLE_OLD_API || defined(__doxygen__)
+	/**
+	 * \defgroup pwm_api PWM API
+	 * With this driver you can control a device with multiple PWM channels.
+	 * You can enable/disable each channel indipendently and also set frequency
+	 * and duty cycle.
+	 *
+	 * API usage example:
+	 * \code
+	 * Pwm pwm; // declare a context structure
+	 * pwm_init(&pwm, 0); // init pwm channel 0
+	 * pwm_setFrequency(&pwm, 1000); // Set frequency of channel 0 to 1000Hz
+	 * pwm_setDuty(&pwm, 0x7FFF); // Set duty to 50% (0xFFFF/2)
+	 * pwm_enable(&pwm, true); // Activate the output
+	 * \endcode
+	 * \{
+	 */
+
+	/**
+	 * Enum describing PWM polarities.
+	 */
+	typedef enum PwmPolarity
+	{
+		/** High pulse: increasing duty increases the part of the signal at high level. */
+		PWM_POL_HIGH_PULSE,
+		/** Positive pulse: same as High pulse. */
+		PWM_POL_POSITIVE = PWM_POL_HIGH_PULSE,
+		/** Low pulse: increasing duty increases the part of the signal at low level. */
+		PWM_POL_LOW_PULSE,
+		/** Negative pulse: same as Low pulse. */
+		PWM_POL_NEGATIVE = PWM_POL_LOW_PULSE,
+	} PwmPolarity;
+
+	struct PwmHardware; //Fwd declaration
+
+	/**
+	 * PWM context structure.
+	 */
+	typedef struct Pwm
+	{
+		unsigned ch;
+		pwm_duty_t duty;
+		PwmPolarity pol;
+		bool enabled;
+		struct PwmHardware *hw;
+	} Pwm;
+
+	void pwm_setDuty(Pwm *ctx, pwm_duty_t duty);
+	void pwm_setFrequency(Pwm *ctx, pwm_freq_t freq);
+	void pwm_setPolarity(Pwm *ctx, PwmPolarity pol);
+	void pwm_enable(Pwm *ctx, bool state);
+	void pwm_init(Pwm *ctx, unsigned channel);
+	/** \} */ //defgroup pwm_api
+#endif
+
+
+#if CFG_PWM_ENABLE_OLD_API
+	/**
+	 * \defgroup pwm_old_api Old PWM API
+	 * This API has strong limititations, so it has been deprecated.
+	 * It is active by default for backward compatibility reasons, but
+	 * for new projects please use the new PWM API.
+	 * In order to disable this API, check CFG_PWM_ENABLE_OLD_API.
+	 * \see pwm_api
+	 * \see CFG_PWM_ENABLE_OLD_API
+	 * \{
+	 */
+
+	#include CPU_HEADER(pwm)
+	#include "hw/pwm_map.h"
+
+	/**
+	 * Set PWM polarity of pwm \p dev.
+	 * \param dev PWM channel.
+	 * \param pol if false positive polarity pulses are generated,
+	 *            if true negative polarity pulses are generated.
+	 * \warning This function has to be called with PWM disabled, otherwise
+	 *          the output value will be undefined.
+	 */
+	INLINE void pwm_setPolarity(PwmDev dev, bool pol)
+	{
+		pwm_hw_setPolarity(dev, pol);
+	}
+
+	void pwm_setDuty(PwmDev dev, pwm_duty_t duty);
+	void pwm_setFrequency(PwmDev dev, pwm_freq_t freq);
+	void pwm_enable(PwmDev dev, bool state);
+	void pwm_init(void);
+	/** \} */ //defgroup pwm_old_api
+#endif
+
+/*
+ * Test function prototypes.
+ *
+ * See pwm_test.c for implemntation of these functions.
+ */
+void pwm_testRun(void);
+int pwm_testSetup(void);
+/* For backward compatibility */
+#define pwm_testSetUp() pwm_testSetup()
+int pwm_testTearDown(void);
+
+
+/** \} */ //defgroup pwm_driver
+
+#endif /* DRV_PWM_H */