FreeRTOS/Demo/CORTEX_ATSAM3S-EK2_Atmel_Studio/src/asf/sam/drivers/pmc/pmc.h - nest-detect/1.2/freertos - Git at Google

 /**
  * \file
  *
  * \brief Power Management Controller (PMC) driver for SAM.
  *
  * Copyright (c) 2011-2012 Atmel Corporation. All rights reserved.
  *
  * \asf_license_start
  *
  * \page License
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  *    this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  *
  * 3. The name of Atmel may not be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * 4. This software may only be redistributed and used in connection with an
  *    Atmel microcontroller product.
  *
  * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
  * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
  * \asf_license_stop
  *
  */

 #ifndef PMC_H_INCLUDED
 #define PMC_H_INCLUDED

 #include "compiler.h"

 /// @cond 0
 /**INDENT-OFF**/
 #ifdef __cplusplus
 extern "C" {
 #endif
 /**INDENT-ON**/
 /// @endcond

 /** Bit mask for peripheral clocks (PCER0) */
 #define PMC_MASK_STATUS0        (0xFFFFFFFC)

 /** Bit mask for peripheral clocks (PCER1) */
 #define PMC_MASK_STATUS1        (0xFFFFFFFF)

 /** Loop counter timeout value */
 #define PMC_TIMEOUT             (2048)

 /** Key to unlock CKGR_MOR register */
 #define PMC_CKGR_MOR_KEY_VALUE  CKGR_MOR_KEY(0x37)

 /** Key used to write SUPC registers */
 #define SUPC_KEY_VALUE          ((uint32_t) 0xA5)

 /** PMC xtal startup time */
 #define PMC_XTAL_STARTUP_TIME   (0x3F)

 /** Mask to access fast startup input */
 #define PMC_FAST_STARTUP_Msk    (0x7FFFFu)

 /** PMC_WPMR Write Protect KEY, unlock it */
 #define PMC_WPMR_WPKEY_VALUE    PMC_WPMR_WPKEY((uint32_t) 0x504D43)

 /** Using external oscillator */
 #define PMC_OSC_XTAL            0

 /** Oscillator in bypass mode */
 #define PMC_OSC_BYPASS          1

 #define PMC_PCK_0               0 /* PCK0 ID */
 #define PMC_PCK_1               1 /* PCK1 ID */
 #define PMC_PCK_2               2 /* PCK2 ID */

 /**
  * \name Master clock (MCK) Source and Prescaler configuration
  *
  * The following functions may be used to select the clock source and
  * prescaler for the master clock.
  */
 //@{

 void pmc_mck_set_prescaler(uint32_t ul_pres);
 void pmc_mck_set_source(uint32_t ul_source);
 uint32_t pmc_switch_mck_to_sclk(uint32_t ul_pres);
 uint32_t pmc_switch_mck_to_mainck(uint32_t ul_pres);
 uint32_t pmc_switch_mck_to_pllack(uint32_t ul_pres);
 #if (SAM3S || SAM4S)
 uint32_t pmc_switch_mck_to_pllbck(uint32_t ul_pres);
 #endif
 #if (SAM3XA || SAM3U)
 uint32_t pmc_switch_mck_to_upllck(uint32_t ul_pres);
 #endif

 //@}

 /**
  * \name Slow clock (SLCK) oscillator and configuration
  *
  */
 //@{

 void pmc_switch_sclk_to_32kxtal(uint32_t ul_bypass);
 uint32_t pmc_osc_is_ready_32kxtal(void);

 //@}

 /**
  * \name Main Clock (MAINCK) oscillator and configuration
  *
  */
 //@{

 void pmc_switch_mainck_to_fastrc(uint32_t ul_moscrcf);
 void pmc_osc_enable_fastrc(uint32_t ul_rc);
 void pmc_osc_disable_fastrc(void);
 void pmc_switch_mainck_to_xtal(uint32_t ul_bypass);
 void pmc_osc_disable_xtal(uint32_t ul_bypass);
 uint32_t pmc_osc_is_ready_mainck(void);

 //@}

 /**
  * \name PLL oscillator and configuration
  *
  */
 //@{

 void pmc_enable_pllack(uint32_t mula, uint32_t pllacount, uint32_t diva);
 void pmc_disable_pllack(void);
 uint32_t pmc_is_locked_pllack(void);

 #if (SAM3S || SAM4S)
 void pmc_enable_pllbck(uint32_t mulb, uint32_t pllbcount, uint32_t divb);
 void pmc_disable_pllbck(void);
 uint32_t pmc_is_locked_pllbck(void);
 #endif

 #if (SAM3XA || SAM3U)
 void pmc_enable_upll_clock(void);
 void pmc_disable_upll_clock(void);
 uint32_t pmc_is_locked_upll(void);
 #endif

 //@}

 /**
  * \name Peripherals clock configuration
  *
  */
 //@{

 uint32_t pmc_enable_periph_clk(uint32_t ul_id);
 uint32_t pmc_disable_periph_clk(uint32_t ul_id);
 void pmc_enable_all_periph_clk(void);
 void pmc_disable_all_periph_clk(void);
 uint32_t pmc_is_periph_clk_enabled(uint32_t ul_id);

 //@}

 /**
  * \name Programmable clock Source and Prescaler configuration
  *
  * The following functions may be used to select the clock source and
  * prescaler for the specified programmable clock.
  */
 //@{

 void pmc_pck_set_prescaler(uint32_t ul_id, uint32_t ul_pres);
 void pmc_pck_set_source(uint32_t ul_id, uint32_t ul_source);
 uint32_t pmc_switch_pck_to_sclk(uint32_t ul_id, uint32_t ul_pres);
 uint32_t pmc_switch_pck_to_mainck(uint32_t ul_id, uint32_t ul_pres);
 uint32_t pmc_switch_pck_to_pllack(uint32_t ul_id, uint32_t ul_pres);
 #if (SAM3S || SAM4S)
 uint32_t pmc_switch_pck_to_pllbck(uint32_t ul_id, uint32_t ul_pres);
 #endif
 #if (SAM3XA || SAM3U)
 uint32_t pmc_switch_pck_to_upllck(uint32_t ul_id, uint32_t ul_pres);
 #endif
 void pmc_enable_pck(uint32_t ul_id);
 void pmc_disable_pck(uint32_t ul_id);
 void pmc_enable_all_pck(void);
 void pmc_disable_all_pck(void);
 uint32_t pmc_is_pck_enabled(uint32_t ul_id);

 //@}

 /**
  * \name USB clock configuration
  *
  */
 //@{

 #if (SAM3S || SAM3XA || SAM4S)
 void pmc_switch_udpck_to_pllack(uint32_t ul_usbdiv);
 #endif
 #if (SAM3S || SAM4S)
 void pmc_switch_udpck_to_pllbck(uint32_t ul_usbdiv);
 #endif
 #if (SAM3XA)
 void pmc_switch_udpck_to_upllck(uint32_t ul_usbdiv);
 #endif
 #if (SAM3S || SAM3XA || SAM4S)
 void pmc_enable_udpck(void);
 void pmc_disable_udpck(void);
 #endif

 //@}

 /**
  * \name Interrupt and status management
  *
  */
 //@{

 void pmc_enable_interrupt(uint32_t ul_sources);
 void pmc_disable_interrupt(uint32_t ul_sources);
 uint32_t pmc_get_interrupt_mask(void);
 uint32_t pmc_get_status(void);

 //@}

 /**
  * \name Power management
  *
  * The following functions are used to configure sleep mode and additional
  * wake up inputs.
  */
 //@{

 void pmc_set_fast_startup_input(uint32_t ul_inputs);
 void pmc_clr_fast_startup_input(uint32_t ul_inputs);
 void pmc_enable_sleepmode(uint8_t uc_type);
 void pmc_enable_waitmode(void);
 void pmc_enable_backupmode(void);

 //@}

 /**
  * \name Failure detector
  *
  */
 //@{

 void pmc_enable_clock_failure_detector(void);
 void pmc_disable_clock_failure_detector(void);

 //@}

 /**
  * \name Write protection
  *
  */
 //@{

 void pmc_set_writeprotect(uint32_t ul_enable);
 uint32_t pmc_get_writeprotect_status(void);

 //@}

 /// @cond 0
 /**INDENT-OFF**/
 #ifdef __cplusplus
 }
 #endif
 /**INDENT-ON**/
 /// @endcond

 //! @}

 /**
  * \page sam_pmc_quickstart Quick start guide for the SAM PMC module
  *
  * This is the quick start guide for the \ref pmc_group "PMC module", with
  * step-by-step instructions on how to configure and use the driver in a
  * selection of use cases.
  *
  * The use cases contain several code fragments. The code fragments in the
  * steps for setup can be copied into a custom initialization function, while
  * the steps for usage can be copied into, e.g., the main application function.
  *
  * \section pmc_use_cases PMC use cases
  * - \ref pmc_basic_use_case Basic use case - Switch Main Clock sources
  * - \ref pmc_use_case_2 Advanced use case - Configure Programmable Clocks
  *
  * \section pmc_basic_use_case Basic use case - Switch Main Clock sources
  * In this use case, the PMC module is configured for a variety of system clock
  * sources and speeds. A LED is used to visually indicate the current clock
  * speed as the source is switched.
  *
  * \section pmc_basic_use_case_setup Setup
  *
  * \subsection pmc_basic_use_case_setup_prereq Prerequisites
  * -# \ref gpio_group "General Purpose I/O Management (gpio)"
  *
  * \subsection pmc_basic_use_case_setup_code Code
  * The following function needs to be added to the user application, to flash a
  * board LED a variable number of times at a rate given in CPU ticks.
  *
  * \code
  * #define FLASH_TICK_COUNT   0x00012345
  *
  * void flash_led(uint32_t tick_count, uint8_t flash_count)
  * {
  *     SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
  *     SysTick->LOAD = tick_count;
  *
  *     while (flash_count--)
  *     {
  *         gpio_toggle_pin(LED0_GPIO);
  *         while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
  *         gpio_toggle_pin(LED0_GPIO);
  *         while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
  *     }
  * }
  * \endcode
  *
  * \section pmc_basic_use_case_usage Use case
  *
  * \subsection pmc_basic_use_case_usage_code Example code
  * Add to application C-file:
  * \code
  *    for (;;)
  *    {
  *        pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_12_MHz);
  *        flash_led(FLASH_TICK_COUNT, 5);
  *        pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_8_MHz);
  *        flash_led(FLASH_TICK_COUNT, 5);
  *        pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_4_MHz);
  *        flash_led(FLASH_TICK_COUNT, 5);
  *        pmc_switch_mainck_to_xtal(0);
  *        flash_led(FLASH_TICK_COUNT, 5);
  *    }
  * \endcode
  *
  * \subsection pmc_basic_use_case_usage_flow Workflow
  * -# Wrap the code in an infinite loop:
  *   \code
  *   for (;;)
  *   \endcode
  * -# Switch the Master CPU frequency to the internal 12MHz RC oscillator, flash
  *    a LED on the board several times:
  *   \code
  *   pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_12_MHz);
  *   flash_led(FLASH_TICK_COUNT, 5);
  *   \endcode
  * -# Switch the Master CPU frequency to the internal 8MHz RC oscillator, flash
  *    a LED on the board several times:
  *   \code
  *   pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_8_MHz);
  *   flash_led(FLASH_TICK_COUNT, 5);
  *   \endcode
  * -# Switch the Master CPU frequency to the internal 4MHz RC oscillator, flash
  *    a LED on the board several times:
  *   \code
  *   pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_4_MHz);
  *   flash_led(FLASH_TICK_COUNT, 5);
  *   \endcode
  * -# Switch the Master CPU frequency to the external crystal oscillator, flash
  *    a LED on the board several times:
  *   \code
  *   pmc_switch_mainck_to_xtal(0);
  *   flash_led(FLASH_TICK_COUNT, 5);
  *   \endcode
  */

 /**
  * \page pmc_use_case_2 Use case #2 - Configure Programmable Clocks
  * In this use case, the PMC module is configured to start the Slow Clock from
  * an attached 32KHz crystal, and start one of the Programmable Clock modules
  * sourced from the Slow Clock divided down with a prescale factor of 64.
  *
  * \section pmc_use_case_2_setup Setup
  *
  * \subsection pmc_use_case_2_setup_prereq Prerequisites
  * -# \ref pio_group "Parallel Input/Output Controller (pio)"
  *
  * \subsection pmc_use_case_2_setup_code Code
  * The following code must be added to the user application:
  * \code
  * 	pio_set_peripheral(PIOA, PIO_PERIPH_B, PIO_PA17);
  * \endcode
  *
  * \subsection pmc_use_case_2_setup_code_workflow Workflow
  * -# Configure the PCK1 pin to output on a specific port pin (in this case,
  *    PIOA pin 17) of the microcontroller.
  *   \code
  *   pio_set_peripheral(PIOA, PIO_PERIPH_B, PIO_PA17);
  *   \endcode
  *   \note The peripheral selection and pin will vary according to your selected
  *       SAM device model. Refer to the "Peripheral Signal Multiplexing on I/O
  *       Lines" of your device's datasheet.
  *
  * \section pmc_use_case_2_usage Use case
  * The generated PCK1 clock output can be viewed on an oscilloscope attached to
  * the correct pin of the microcontroller.
  *
  * \subsection pmc_use_case_2_usage_code Example code
  * Add to application C-file:
  * \code
  *  pmc_switch_sclk_to_32kxtal(PMC_OSC_XTAL);
  *  pmc_switch_pck_to_sclk(PMC_PCK_1, PMC_PCK_PRES_CLK_64);
  *  pmc_enable_pck(PMC_PCK_1);
  *
  *  for (;;)
  *  {
  *      // Do Nothing
  *  }
  * \endcode
  *
  * \subsection pmc_use_case_2_usage_flow Workflow
  * -# Switch the Slow Clock source input to an external 32KHz crystal:
  *   \code
  *   pmc_switch_sclk_to_32kxtal(PMC_OSC_XTAL);
  *   \endcode
  * -# Switch the Programmable Clock module PCK1 source clock to the Slow Clock,
  *    with a prescaler of 64:
  *   \code
  *   pmc_switch_pck_to_sclk(PMC_PCK_1, PMC_PCK_PRES_CLK_64);
  *   \endcode
  * -# Enable Programmable Clock module PCK1:
  *   \code
  *   pmc_enable_pck(PMC_PCK_1);
  *   \endcode
  * -# Enter an infinite loop:
  *   \code
  *   for (;;)
  *   {
  *      // Do Nothing
  *   }
  *   \endcode
  */

 #endif /* PMC_H_INCLUDED */
	/**
	* \file
	*
	* \brief Power Management Controller (PMC) driver for SAM.
	*
	* Copyright (c) 2011-2012 Atmel Corporation. All rights reserved.
	*
	* \asf_license_start
	*
	* \page License
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* 3. The name of Atmel may not be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* 4. This software may only be redistributed and used in connection with an
	* Atmel microcontroller product.
	*
	* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
	* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
	* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*
	* \asf_license_stop
	*
	*/

	#ifndef PMC_H_INCLUDED
	#define PMC_H_INCLUDED

	#include "compiler.h"

	/// @cond 0
	/INDENT-OFF/
	#ifdef __cplusplus
	extern "C" {
	#endif
	/INDENT-ON/
	/// @endcond

	/** Bit mask for peripheral clocks (PCER0) */
	#define PMC_MASK_STATUS0 (0xFFFFFFFC)

	/** Bit mask for peripheral clocks (PCER1) */
	#define PMC_MASK_STATUS1 (0xFFFFFFFF)

	/** Loop counter timeout value */
	#define PMC_TIMEOUT (2048)

	/** Key to unlock CKGR_MOR register */
	#define PMC_CKGR_MOR_KEY_VALUE CKGR_MOR_KEY(0x37)

	/** Key used to write SUPC registers */
	#define SUPC_KEY_VALUE ((uint32_t) 0xA5)

	/** PMC xtal startup time */
	#define PMC_XTAL_STARTUP_TIME (0x3F)

	/** Mask to access fast startup input */
	#define PMC_FAST_STARTUP_Msk (0x7FFFFu)

	/** PMC_WPMR Write Protect KEY, unlock it */
	#define PMC_WPMR_WPKEY_VALUE PMC_WPMR_WPKEY((uint32_t) 0x504D43)

	/** Using external oscillator */
	#define PMC_OSC_XTAL 0

	/** Oscillator in bypass mode */
	#define PMC_OSC_BYPASS 1

	#define PMC_PCK_0 0 /* PCK0 ID */
	#define PMC_PCK_1 1 /* PCK1 ID */
	#define PMC_PCK_2 2 /* PCK2 ID */

	/**
	* \name Master clock (MCK) Source and Prescaler configuration
	*
	* The following functions may be used to select the clock source and
	* prescaler for the master clock.
	*/
	//@{

	void pmc_mck_set_prescaler(uint32_t ul_pres);
	void pmc_mck_set_source(uint32_t ul_source);
	uint32_t pmc_switch_mck_to_sclk(uint32_t ul_pres);
	uint32_t pmc_switch_mck_to_mainck(uint32_t ul_pres);
	uint32_t pmc_switch_mck_to_pllack(uint32_t ul_pres);
	#if (SAM3S \|\| SAM4S)
	uint32_t pmc_switch_mck_to_pllbck(uint32_t ul_pres);
	#endif
	#if (SAM3XA \|\| SAM3U)
	uint32_t pmc_switch_mck_to_upllck(uint32_t ul_pres);
	#endif

	//@}

	/**
	* \name Slow clock (SLCK) oscillator and configuration
	*
	*/
	//@{

	void pmc_switch_sclk_to_32kxtal(uint32_t ul_bypass);
	uint32_t pmc_osc_is_ready_32kxtal(void);

	//@}

	/**
	* \name Main Clock (MAINCK) oscillator and configuration
	*
	*/
	//@{

	void pmc_switch_mainck_to_fastrc(uint32_t ul_moscrcf);
	void pmc_osc_enable_fastrc(uint32_t ul_rc);
	void pmc_osc_disable_fastrc(void);
	void pmc_switch_mainck_to_xtal(uint32_t ul_bypass);
	void pmc_osc_disable_xtal(uint32_t ul_bypass);
	uint32_t pmc_osc_is_ready_mainck(void);

	//@}

	/**
	* \name PLL oscillator and configuration
	*
	*/
	//@{

	void pmc_enable_pllack(uint32_t mula, uint32_t pllacount, uint32_t diva);
	void pmc_disable_pllack(void);
	uint32_t pmc_is_locked_pllack(void);

	#if (SAM3S \|\| SAM4S)
	void pmc_enable_pllbck(uint32_t mulb, uint32_t pllbcount, uint32_t divb);
	void pmc_disable_pllbck(void);
	uint32_t pmc_is_locked_pllbck(void);
	#endif

	#if (SAM3XA \|\| SAM3U)
	void pmc_enable_upll_clock(void);
	void pmc_disable_upll_clock(void);
	uint32_t pmc_is_locked_upll(void);
	#endif

	//@}

	/**
	* \name Peripherals clock configuration
	*
	*/
	//@{

	uint32_t pmc_enable_periph_clk(uint32_t ul_id);
	uint32_t pmc_disable_periph_clk(uint32_t ul_id);
	void pmc_enable_all_periph_clk(void);
	void pmc_disable_all_periph_clk(void);
	uint32_t pmc_is_periph_clk_enabled(uint32_t ul_id);

	//@}

	/**
	* \name Programmable clock Source and Prescaler configuration
	*
	* The following functions may be used to select the clock source and
	* prescaler for the specified programmable clock.
	*/
	//@{

	void pmc_pck_set_prescaler(uint32_t ul_id, uint32_t ul_pres);
	void pmc_pck_set_source(uint32_t ul_id, uint32_t ul_source);
	uint32_t pmc_switch_pck_to_sclk(uint32_t ul_id, uint32_t ul_pres);
	uint32_t pmc_switch_pck_to_mainck(uint32_t ul_id, uint32_t ul_pres);
	uint32_t pmc_switch_pck_to_pllack(uint32_t ul_id, uint32_t ul_pres);
	#if (SAM3S \|\| SAM4S)
	uint32_t pmc_switch_pck_to_pllbck(uint32_t ul_id, uint32_t ul_pres);
	#endif
	#if (SAM3XA \|\| SAM3U)
	uint32_t pmc_switch_pck_to_upllck(uint32_t ul_id, uint32_t ul_pres);
	#endif
	void pmc_enable_pck(uint32_t ul_id);
	void pmc_disable_pck(uint32_t ul_id);
	void pmc_enable_all_pck(void);
	void pmc_disable_all_pck(void);
	uint32_t pmc_is_pck_enabled(uint32_t ul_id);

	//@}

	/**
	* \name USB clock configuration
	*
	*/
	//@{

	#if (SAM3S \|\| SAM3XA \|\| SAM4S)
	void pmc_switch_udpck_to_pllack(uint32_t ul_usbdiv);
	#endif
	#if (SAM3S \|\| SAM4S)
	void pmc_switch_udpck_to_pllbck(uint32_t ul_usbdiv);
	#endif
	#if (SAM3XA)
	void pmc_switch_udpck_to_upllck(uint32_t ul_usbdiv);
	#endif
	#if (SAM3S \|\| SAM3XA \|\| SAM4S)
	void pmc_enable_udpck(void);
	void pmc_disable_udpck(void);
	#endif

	//@}

	/**
	* \name Interrupt and status management
	*
	*/
	//@{

	void pmc_enable_interrupt(uint32_t ul_sources);
	void pmc_disable_interrupt(uint32_t ul_sources);
	uint32_t pmc_get_interrupt_mask(void);
	uint32_t pmc_get_status(void);

	//@}

	/**
	* \name Power management
	*
	* The following functions are used to configure sleep mode and additional
	* wake up inputs.
	*/
	//@{

	void pmc_set_fast_startup_input(uint32_t ul_inputs);
	void pmc_clr_fast_startup_input(uint32_t ul_inputs);
	void pmc_enable_sleepmode(uint8_t uc_type);
	void pmc_enable_waitmode(void);
	void pmc_enable_backupmode(void);

	//@}

	/**
	* \name Failure detector
	*
	*/
	//@{

	void pmc_enable_clock_failure_detector(void);
	void pmc_disable_clock_failure_detector(void);

	//@}

	/**
	* \name Write protection
	*
	*/
	//@{

	void pmc_set_writeprotect(uint32_t ul_enable);
	uint32_t pmc_get_writeprotect_status(void);

	//@}

	/// @cond 0
	/INDENT-OFF/
	#ifdef __cplusplus
	}
	#endif
	/INDENT-ON/
	/// @endcond

	//! @}

	/**
	* \page sam_pmc_quickstart Quick start guide for the SAM PMC module
	*
	* This is the quick start guide for the \ref pmc_group "PMC module", with
	* step-by-step instructions on how to configure and use the driver in a
	* selection of use cases.
	*
	* The use cases contain several code fragments. The code fragments in the
	* steps for setup can be copied into a custom initialization function, while
	* the steps for usage can be copied into, e.g., the main application function.
	*
	* \section pmc_use_cases PMC use cases
	* - \ref pmc_basic_use_case Basic use case - Switch Main Clock sources
	* - \ref pmc_use_case_2 Advanced use case - Configure Programmable Clocks
	*
	* \section pmc_basic_use_case Basic use case - Switch Main Clock sources
	* In this use case, the PMC module is configured for a variety of system clock
	* sources and speeds. A LED is used to visually indicate the current clock
	* speed as the source is switched.
	*
	* \section pmc_basic_use_case_setup Setup
	*
	* \subsection pmc_basic_use_case_setup_prereq Prerequisites
	* -# \ref gpio_group "General Purpose I/O Management (gpio)"
	*
	* \subsection pmc_basic_use_case_setup_code Code
	* The following function needs to be added to the user application, to flash a
	* board LED a variable number of times at a rate given in CPU ticks.
	*
	* \code
	* #define FLASH_TICK_COUNT 0x00012345
	*
	* void flash_led(uint32_t tick_count, uint8_t flash_count)
	* {
	* SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
	* SysTick->LOAD = tick_count;
	*
	* while (flash_count--)
	* {
	* gpio_toggle_pin(LED0_GPIO);
	* while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
	* gpio_toggle_pin(LED0_GPIO);
	* while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
	* }
	* }
	* \endcode
	*
	* \section pmc_basic_use_case_usage Use case
	*
	* \subsection pmc_basic_use_case_usage_code Example code
	* Add to application C-file:
	* \code
	* for (;;)
	* {
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_12_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_8_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_4_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* pmc_switch_mainck_to_xtal(0);
	* flash_led(FLASH_TICK_COUNT, 5);
	* }
	* \endcode
	*
	* \subsection pmc_basic_use_case_usage_flow Workflow
	* -# Wrap the code in an infinite loop:
	* \code
	* for (;;)
	* \endcode
	* -# Switch the Master CPU frequency to the internal 12MHz RC oscillator, flash
	* a LED on the board several times:
	* \code
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_12_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* \endcode
	* -# Switch the Master CPU frequency to the internal 8MHz RC oscillator, flash
	* a LED on the board several times:
	* \code
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_8_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* \endcode
	* -# Switch the Master CPU frequency to the internal 4MHz RC oscillator, flash
	* a LED on the board several times:
	* \code
	* pmc_switch_mainck_to_fastrc(CKGR_MOR_MOSCRCF_4_MHz);
	* flash_led(FLASH_TICK_COUNT, 5);
	* \endcode
	* -# Switch the Master CPU frequency to the external crystal oscillator, flash
	* a LED on the board several times:
	* \code
	* pmc_switch_mainck_to_xtal(0);
	* flash_led(FLASH_TICK_COUNT, 5);
	* \endcode
	*/

	/**
	* \page pmc_use_case_2 Use case #2 - Configure Programmable Clocks
	* In this use case, the PMC module is configured to start the Slow Clock from
	* an attached 32KHz crystal, and start one of the Programmable Clock modules
	* sourced from the Slow Clock divided down with a prescale factor of 64.
	*
	* \section pmc_use_case_2_setup Setup
	*
	* \subsection pmc_use_case_2_setup_prereq Prerequisites
	* -# \ref pio_group "Parallel Input/Output Controller (pio)"
	*
	* \subsection pmc_use_case_2_setup_code Code
	* The following code must be added to the user application:
	* \code
	* pio_set_peripheral(PIOA, PIO_PERIPH_B, PIO_PA17);
	* \endcode
	*
	* \subsection pmc_use_case_2_setup_code_workflow Workflow
	* -# Configure the PCK1 pin to output on a specific port pin (in this case,
	* PIOA pin 17) of the microcontroller.
	* \code
	* pio_set_peripheral(PIOA, PIO_PERIPH_B, PIO_PA17);
	* \endcode
	* \note The peripheral selection and pin will vary according to your selected
	* SAM device model. Refer to the "Peripheral Signal Multiplexing on I/O
	* Lines" of your device's datasheet.
	*
	* \section pmc_use_case_2_usage Use case
	* The generated PCK1 clock output can be viewed on an oscilloscope attached to
	* the correct pin of the microcontroller.
	*
	* \subsection pmc_use_case_2_usage_code Example code
	* Add to application C-file:
	* \code
	* pmc_switch_sclk_to_32kxtal(PMC_OSC_XTAL);
	* pmc_switch_pck_to_sclk(PMC_PCK_1, PMC_PCK_PRES_CLK_64);
	* pmc_enable_pck(PMC_PCK_1);
	*
	* for (;;)
	* {
	* // Do Nothing
	* }
	* \endcode
	*
	* \subsection pmc_use_case_2_usage_flow Workflow
	* -# Switch the Slow Clock source input to an external 32KHz crystal:
	* \code
	* pmc_switch_sclk_to_32kxtal(PMC_OSC_XTAL);
	* \endcode
	* -# Switch the Programmable Clock module PCK1 source clock to the Slow Clock,
	* with a prescaler of 64:
	* \code
	* pmc_switch_pck_to_sclk(PMC_PCK_1, PMC_PCK_PRES_CLK_64);
	* \endcode
	* -# Enable Programmable Clock module PCK1:
	* \code
	* pmc_enable_pck(PMC_PCK_1);
	* \endcode
	* -# Enter an infinite loop:
	* \code
	* for (;;)
	* {
	* // Do Nothing
	* }
	* \endcode
	*/

	#endif /* PMC_H_INCLUDED */