hardware/arduino/sam/system/libsam/include/pmc.h

/* ----------------------------------------------------------------------------
 *         SAM Software Package License
 * ----------------------------------------------------------------------------
 * Copyright (c) 2011, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: 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
 * 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.
 * ----------------------------------------------------------------------------
 */

#ifndef PMC_H_INCLUDED
#define PMC_H_INCLUDED

#include "../chip.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 statup time */
#define PMC_XTAL_STARTUP_TIME   (0x3F)

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

/** 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_SERIES || SAM4S_SERIES)
uint32_t pmc_switch_mck_to_pllbck(uint32_t ul_pres);
#endif
#if (SAM3XA_SERIES || SAM3U_SERIES)
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_SERIES || SAM4S_SERIES)
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_SERIES || SAM3U_SERIES)
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_SERIES || SAM4S_SERIES)
uint32_t pmc_switch_pck_to_pllbck(uint32_t ul_id, uint32_t ul_pres);
#endif
#if (SAM3XA_SERIES || SAM3U_SERIES)
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_SERIES || SAM3XA_SERIES || SAM4S_SERIES)
void pmc_switch_udpck_to_pllack(uint32_t ul_usbdiv);
#endif
#if (SAM3S_SERIES || SAM4S_SERIES)
void pmc_switch_udpck_to_pllbck(uint32_t ul_usbdiv);
#endif
#if (SAM3XA_SERIES)
void pmc_switch_udpck_to_upllck(uint32_t ul_usbdiv);
#endif
#if (SAM3S_SERIES || SAM3XA_SERIES || SAM4S_SERIES)
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 additionnal
 * 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 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 */