339 lines
14 KiB
C
339 lines
14 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2012.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
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*
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* Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
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* of the various clocks within the device to clock the various peripherals.
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*/
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/** \ingroup Group_PlatformDrivers_UC3
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* \defgroup Group_PlatformDrivers_UC3Clocks Clock Management Driver - LUFA/Platform/UC3/ClockManagement.h
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* \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - None
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*
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* \section Sec_ModDescription Module Description
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* Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
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* of the various clocks within the device to clock the various peripherals.
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*
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* Usage Example:
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* \code
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* #include <LUFA/Platform/UC3/ClockManagement.h>
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*
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* void main(void)
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* {
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* // Start the master external oscillator which will be used as the main clock reference
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* AVR32CLK_StartExternalOscillator(0, EXOSC_MODE_8MHZ_OR_MORE, EXOSC_START_0CLK);
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*
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* // Start the PLL for the CPU clock, switch CPU to it
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* AVR32CLK_StartPLL(0, CLOCK_SRC_OSC0, 12000000, F_CPU);
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* AVR32CLK_SetCPUClockSource(CLOCK_SRC_PLL0, F_CPU);
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*
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* // Start the PLL for the USB Generic Clock module
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* AVR32CLK_StartPLL(1, CLOCK_SRC_OSC0, 12000000, 48000000);
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* }
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* \endcode
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*
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* @{
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*/
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#ifndef _UC3_CLOCK_MANAGEMENT_H_
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#define _UC3_CLOCK_MANAGEMENT_H_
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/* Includes: */
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#include "../../Common/Common.h"
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Enum for the possible external oscillator types. */
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enum UC3_Extern_OSC_ClockTypes_t
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{
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EXOSC_MODE_CLOCK = AVR32_PM_OSCCTRL0_MODE_EXT_CLOCK, /**< External clock (non-crystal) mode. */
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EXOSC_MODE_900KHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G0, /**< External crystal oscillator equal to or slower than 900KHz. */
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EXOSC_MODE_3MHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G1, /**< External crystal oscillator equal to or slower than 3MHz. */
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EXOSC_MODE_8MHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G2, /**< External crystal oscillator equal to or slower than 8MHz. */
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EXOSC_MODE_8MHZ_OR_MORE = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G3, /**< External crystal oscillator equal to or faster than 8MHz. */
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};
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/** Enum for the possible external oscillator startup times. */
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enum UC3_Extern_OSC_ClockStartup_t
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{
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EXOSC_START_0CLK = AVR32_PM_OSCCTRL0_STARTUP_0_RCOSC, /**< Immediate startup, no delay. */
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EXOSC_START_64CLK = AVR32_PM_OSCCTRL0_STARTUP_64_RCOSC, /**< Wait 64 clock cycles before startup for stability. */
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EXOSC_START_128CLK = AVR32_PM_OSCCTRL0_STARTUP_128_RCOSC, /**< Wait 128 clock cycles before startup for stability. */
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EXOSC_START_2048CLK = AVR32_PM_OSCCTRL0_STARTUP_2048_RCOSC, /**< Wait 2048 clock cycles before startup for stability. */
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EXOSC_START_4096CLK = AVR32_PM_OSCCTRL0_STARTUP_4096_RCOSC, /**< Wait 4096 clock cycles before startup for stability. */
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EXOSC_START_8192CLK = AVR32_PM_OSCCTRL0_STARTUP_8192_RCOSC, /**< Wait 8192 clock cycles before startup for stability. */
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EXOSC_START_16384CLK = AVR32_PM_OSCCTRL0_STARTUP_16384_RCOSC, /**< Wait 16384 clock cycles before startup for stability. */
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};
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/** Enum for the possible module clock sources. */
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enum UC3_System_ClockSource_t
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{
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CLOCK_SRC_SLOW_CLK = 0, /**< Clock sourced from the internal slow clock. */
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CLOCK_SRC_OSC0 = 1, /**< Clock sourced from the Oscillator 0 clock. */
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CLOCK_SRC_OSC1 = 2, /**< Clock sourced from the Oscillator 1 clock. */
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CLOCK_SRC_PLL0 = 3, /**< Clock sourced from the PLL 0 clock. */
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CLOCK_SRC_PLL1 = 4, /**< Clock sourced from the PLL 1 clock. */
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};
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/* Inline Functions: */
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/** Starts the given external oscillator of the UC3 microcontroller, with the given options. This routine blocks until
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* the oscillator is ready for use.
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*
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* \param[in] Channel Index of the external oscillator to start.
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* \param[in] Type Type of clock attached to the given oscillator channel, a value from \ref UC3_Extern_OSC_ClockTypes_t.
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* \param[in] Startup Statup time of the external oscillator, a value from \ref UC3_Extern_OSC_ClockStartup_t.
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*
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* \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified.
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*/
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static inline bool AVR32CLK_StartExternalOscillator(const uint8_t Channel,
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const uint8_t Type,
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const uint8_t Startup) ATTR_ALWAYS_INLINE;
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static inline bool AVR32CLK_StartExternalOscillator(const uint8_t Channel,
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const uint8_t Type,
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const uint8_t Startup)
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{
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switch (Channel)
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{
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case 0:
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AVR32_PM.OSCCTRL0.startup = Startup;
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AVR32_PM.OSCCTRL0.mode = Type;
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break;
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case 1:
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AVR32_PM.OSCCTRL1.startup = Startup;
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AVR32_PM.OSCCTRL1.mode = Type;
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break;
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default:
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return false;
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}
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AVR32_PM.mcctrl |= (1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
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while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_OSC0RDY_OFFSET + Channel))));
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return true;
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}
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/** Stops the given external oscillator of the UC3 microcontroller.
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*
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* \param[in] Channel Index of the external oscillator to stop.
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*/
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static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE;
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static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel)
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{
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AVR32_PM.mcctrl &= ~(1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
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}
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/** Starts the given PLL of the UC3 microcontroller, with the given options. This routine blocks until the PLL is ready for use.
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*
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* \attention The output frequency must be equal to or greater than the source frequency.
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*
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* \param[in] Channel Index of the PLL to start.
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* \param[in] Source Clock source for the PLL, a value from \ref UC3_System_ClockSource_t.
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* \param[in] SourceFreq Frequency of the PLL's clock source, in Hz.
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* \param[in] Frequency Target frequency of the PLL's output.
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*
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* \return Boolean \c true if the PLL was successfully started, \c false if invalid parameters specified.
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*/
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static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
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const uint8_t Source,
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const uint32_t SourceFreq,
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const uint32_t Frequency) ATTR_ALWAYS_INLINE;
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static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
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const uint8_t Source,
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const uint32_t SourceFreq,
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const uint32_t Frequency)
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{
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if (SourceFreq > Frequency)
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return false;
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switch (Source)
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{
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case CLOCK_SRC_OSC0:
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AVR32_PM.PLL[Channel].pllosc = 0;
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break;
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case CLOCK_SRC_OSC1:
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AVR32_PM.PLL[Channel].pllosc = 1;
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break;
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default:
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return false;
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}
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AVR32_PM.PLL[Channel].pllmul = (Frequency / SourceFreq) ? (((Frequency / SourceFreq) - 1) / 2) : 0;
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AVR32_PM.PLL[Channel].plldiv = 0;
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AVR32_PM.PLL[Channel].pllen = true;
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while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_LOCK0_OFFSET + Channel))));
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return true;
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}
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/** Stops the given PLL of the UC3 microcontroller.
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*
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* \param[in] Channel Index of the PLL to stop.
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*/
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static inline void AVR32CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE;
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static inline void AVR32CLK_StopPLL(const uint8_t Channel)
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{
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AVR32_PM.PLL[Channel].pllen = false;
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}
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/** Starts the given Generic Clock of the UC3 microcontroller, with the given options.
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*
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* \param[in] Channel Index of the Generic Clock to start.
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* \param[in] Source Clock source for the Generic Clock, a value from \ref UC3_System_ClockSource_t.
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* \param[in] SourceFreq Frequency of the Generic Clock's clock source, in Hz.
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* \param[in] Frequency Target frequency of the Generic Clock's output.
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*
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* \return Boolean \c true if the Generic Clock was successfully started, \c false if invalid parameters specified.
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*/
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static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
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const uint8_t Source,
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const uint32_t SourceFreq,
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const uint32_t Frequency) ATTR_ALWAYS_INLINE;
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static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
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const uint8_t Source,
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const uint32_t SourceFreq,
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const uint32_t Frequency)
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{
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if (Channel >= AVR32_PM_GCLK_NUM)
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return false;
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if (SourceFreq < Frequency)
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return false;
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switch (Source)
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{
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case CLOCK_SRC_OSC0:
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AVR32_PM.GCCTRL[Channel].pllsel = false;
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AVR32_PM.GCCTRL[Channel].oscsel = 0;
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break;
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case CLOCK_SRC_OSC1:
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AVR32_PM.GCCTRL[Channel].pllsel = false;
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AVR32_PM.GCCTRL[Channel].oscsel = 1;
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break;
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case CLOCK_SRC_PLL0:
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AVR32_PM.GCCTRL[Channel].pllsel = true;
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AVR32_PM.GCCTRL[Channel].oscsel = 0;
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break;
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case CLOCK_SRC_PLL1:
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AVR32_PM.GCCTRL[Channel].pllsel = true;
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AVR32_PM.GCCTRL[Channel].oscsel = 1;
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break;
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default:
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return false;
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}
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AVR32_PM.GCCTRL[Channel].diven = (SourceFreq > Frequency) ? true : false;
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AVR32_PM.GCCTRL[Channel].div = (((SourceFreq / Frequency) - 1) / 2);
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AVR32_PM.GCCTRL[Channel].cen = true;
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return true;
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}
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/** Stops the given generic clock of the UC3 microcontroller.
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*
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* \param[in] Channel Index of the generic clock to stop.
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*
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* \return Boolean \c true if the generic clock was sucessfully stopped, \c false if invalid parameters specified.
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*/
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static inline bool AVR32CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE;
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static inline bool AVR32CLK_StopGenericClock(const uint8_t Channel)
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{
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if (Channel >= AVR32_PM_GCLK_NUM)
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return false;
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AVR32_PM.GCCTRL[Channel].cen = false;
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return true;
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}
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/** Sets the clock source for the main microcontroller core. The given clock source should be configured
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* and ready for use before this function is called.
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*
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* This function will configure the FLASH controller's wait states automatically to suit the given clock source.
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*
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* \param[in] Source Clock source for the CPU core, a value from \ref UC3_System_ClockSource_t.
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* \param[in] SourceFreq Frequency of the CPU core's clock source, in Hz.
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*
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* \return Boolean \c true if the CPU core clock was sucessfully altered, \c false if invalid parameters specified.
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*/
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static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
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const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
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static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
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const uint32_t SourceFreq)
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{
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if (SourceFreq > AVR32_PM_CPU_MAX_FREQ)
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return false;
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AVR32_FLASHC.FCR.fws = (SourceFreq > AVR32_FLASHC_FWS_0_MAX_FREQ) ? true : false;
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switch (Source)
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{
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#if defined(AVR32_PM_MCCTRL_MCSEL_SLOW)
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case CLOCK_SRC_SLOW_CLK:
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AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_SLOW;
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break;
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#endif
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#if defined(AVR32_PM_MCCTRL_MCSEL_OSC0)
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case CLOCK_SRC_OSC0:
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AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_OSC0;
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break;
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#endif
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#if defined(AVR32_PM_MCCTRL_MCSEL_PLL0)
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case CLOCK_SRC_PLL0:
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AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_PLL0;
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break;
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#endif
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default:
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return false;
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}
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return true;
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}
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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