X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/77a9df36a77d2523dd2bc24fa17f9f04c6c175c5..8e20e8697ff88d38ac01d62198dbdd552449e4aa:/LUFA/Platform/XMEGA/ClockManagement.h diff --git a/LUFA/Platform/XMEGA/ClockManagement.h b/LUFA/Platform/XMEGA/ClockManagement.h index de531c298..20fb6464c 100644 --- a/LUFA/Platform/XMEGA/ClockManagement.h +++ b/LUFA/Platform/XMEGA/ClockManagement.h @@ -1,222 +1,375 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2011. - - dean [at] fourwalledcubicle [dot] com - www.lufa-lib.org -*/ - -/* - Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) - - Permission to use, copy, modify, distribute, and sell this - software and its documentation for any purpose is hereby granted - without fee, provided that the above copyright notice appear in - all copies and that both that the copyright notice and this - permission notice and warranty disclaimer appear in supporting - documentation, and that the name of the author not be used in - advertising or publicity pertaining to distribution of the - software without specific, written prior permission. - - The author disclaim all warranties with regard to this - software, including all implied warranties of merchantability - and fitness. In no event shall the author be liable for any - special, indirect or consequential damages or any damages - whatsoever resulting from loss of use, data or profits, whether - in an action of contract, negligence or other tortious action, - arising out of or in connection with the use or performance of - this software. -*/ - -/** \file - * \brief Module Clock Driver for the AVR USB XMEGA microcontrollers. - * - * Clock management driver for the AVR USB XMEGA microcontrollers. This driver allows for the configuration - * of the various clocks within the device to clock the various peripherals. - */ - -/** \ingroup Group_PlatformDrivers - * \defgroup Group_PlatformDrivers_XMEGAClocks AVR USB XMEGA Clock Management Driver - LUFA/Platform/XMEGA/ClockManagement.h - * \brief Module Clock Driver for the AVR USB XMEGA microcontrollers. - * - * \section Sec_Dependencies Module Source Dependencies - * The following files must be built with any user project that uses this module: - * - None - * - * \section Sec_ModDescription Module Description - * Clock management driver for the AVR USB XMEGA microcontrollers. This driver allows for the configuration - * of the various clocks within the device to clock the various peripherals. - * - * Usage Example: - * \code - * #include - * - * void main(void) - * { - * [TODO] - * } - * \endcode - * - * @{ - */ - -#ifndef _XMEGA_CLOCK_MANAGEMENT_H_ -#define _XMEGA_CLOCK_MANAGEMENT_H_ - - /* Includes: */ - #include - - /* Enable C linkage for C++ Compilers: */ - #if defined(__cplusplus) - extern "C" { - #endif - - /* Public Interface - May be used in end-application: */ - /* Macros: */ - /** Enum for the possible external oscillator types. */ - enum XMEGA_Extern_OSC_ClockTypes_t - { - EXOSC_MODE_2MHZ_MAX = OSC_FRQRANGE_04TO2_gc, /**< External crystal oscillator equal to or slower than 2MHz. */ - EXOSC_MODE_9MHZ_MAX = OSC_FRQRANGE_2TO9_gc, /**< External crystal oscillator equal to or slower than 9MHz. */ - EXOSC_MODE_12MHZ_MAX = OSC_FRQRANGE_9TO12_gc, /**< External crystal oscillator equal to or slower than 12MHz. */ - EXOSC_MODE_16MHZ_MAX = OSC_FRQRANGE_12TO16_gc, /**< External crystal oscillator equal to or slower than 16MHz. */ - }; - - /** Enum for the possible external oscillator statup times. */ - enum XMEGA_Extern_OSC_ClockStartup_t - { - EXOSC_START_6CLK = OSC_XOSCSEL_EXTCLK_gc, /**< Wait 6 clock cycles before startup (external clock). */ - EXOSC_START_32KCLK = OSC_XOSCSEL_32KHz_gc, /**< Wait 32K clock cycles before startup (32.768KHz crystal). */ - EXOSC_START_256CLK = OSC_XOSCSEL_XTAL_256CLK_gc, /**< Wait 256 clock cycles before startup. */ - EXOSC_START_1KCLK = OSC_XOSCSEL_XTAL_1KCLK_gc, /**< Wait 1K clock cycles before startup. */ - EXOSC_START_16KCLK = OSC_XOSCSEL_XTAL_16KCLK_gc, /**< Wait 16K clock cycles before startup. */ - }; - - /** Enum for the possible module clock sources. */ - enum XMEGA_System_ClockSource_t - { - CLOCK_SRC_INT_RC2MHZ = 0, /**< Clock sourced from the Internal 2MHz RC Oscillator clock. */ - CLOCK_SRC_INT_RC32MHZ = 1, /**< Clock sourced from the Internal 32MHz RC Oscillator clock. */ - CLOCK_SRC_INT_RC32KHZ = 2, /**< Clock sourced from the Internal 32KHz RC Oscillator clock. */ - CLOCK_SRC_XOSC = 3, /**< Clock sourced from the External Oscillator clock. */ - CLOCK_SRC_PLL = 4, /**< Clock sourced from the Internal PLL clock. */ - }; - - /* Inline Functions: */ - /** Starts the given external oscillator of the UC3 microcontroller, with the given options. This routine blocks until - * the oscillator is ready for use. - * - * \param[in] Channel Index of the external oscillator to start. - * \param[in] Type Type of clock attached to the given oscillator channel, a value from \ref XMEGA_Extern_OSC_ClockTypes_t. - * \param[in] Startup Statup time of the external oscillator, a value from \ref XMEGA_Extern_OSC_ClockStartup_t. - * - * \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified. - */ - static inline uint8_t AVR32CLK_StartExternalOscillator(const uint8_t Channel, - const uint8_t Type, - const uint8_t Startup) ATTR_ALWAYS_INLINE; - static inline uint8_t AVR32CLK_StartExternalOscillator(const uint8_t Channel, - const uint8_t Type, - const uint8_t Startup) - { - return false; // TODO - } - - /** Stops the given external oscillator of the UC3 microcontroller. - * - * \param[in] Channel Index of the external oscillator to stop. - */ - static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE; - static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel) - { - return; // TODO - } - - /** Starts the given PLL of the UC3 microcontroller, with the given options. This routine blocks until the PLL is ready for use. - * - * \param[in] Channel Index of the PLL to start. - * \param[in] Source Clock source for the PLL, a value from \ref XMEGA_System_ClockSource_t. - * \param[in] SourceFreq Frequency of the PLL's clock source, in Hz. - * \param[in] Frequency Target frequency of the PLL's output. - * - * \return Boolean \c true if the PLL was successfully started, \c false if invalid parameters specified. - */ - static inline bool AVR32CLK_StartPLL(const uint8_t Channel, - const uint8_t Source, - const uint32_t SourceFreq, - const uint32_t Frequency) ATTR_ALWAYS_INLINE; - static inline bool AVR32CLK_StartPLL(const uint8_t Channel, - const uint8_t Source, - const uint32_t SourceFreq, - const uint32_t Frequency) - { - return false; // TODO - } - - /** Stops the given PLL of the UC3 microcontroller. - * - * \param[in] Channel Index of the PLL to stop. - */ - static inline void AVR32CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE; - static inline void AVR32CLK_StopPLL(const uint8_t Channel) - { - // TODO - } - - /** Starts the given Generic Clock of the UC3 microcontroller, with the given options. - * - * \param[in] Channel Index of the Generic Clock to start. - * \param[in] Source Clock source for the Generic Clock, a value from \ref XMEGA_System_ClockSource_t. - * \param[in] SourceFreq Frequency of the Generic Clock's clock source, in Hz. - * \param[in] Frequency Target frequency of the Generic Clock's output. - * - * \return Boolean \c true if the Generic Clock was successfully started, \c false if invalid parameters specified. - */ - static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel, - const uint8_t Source, - const uint32_t SourceFreq, - const uint32_t Frequency) ATTR_ALWAYS_INLINE; - static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel, - const uint8_t Source, - const uint32_t SourceFreq, - const uint32_t Frequency) - { - return false; // TODO - } - - /** Stops the given generic clock of the UC3 microcontroller. - * - * \param[in] Channel Index of the generic clock to stop. - */ - static inline void AVR32CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE; - static inline void AVR32CLK_StopGenericClock(const uint8_t Channel) - { - // TODO - } - - /** Sets the clock source for the main microcontroller core. The given clock source should be configured - * and ready for use before this function is called. - * - * This function will configure the FLASH controller's wait states automatically to suit the given clock source. - * - * \param[in] Source Clock source for the CPU core, a value from \ref XMEGA_System_ClockSource_t. - * \param[in] SourceFreq Frequency of the CPU core's clock source, in Hz. - * - * \return Boolean \c true if the CPU core clock was sucessfully altered, \c false if invalid parameters specified. - */ - static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source, - const uint32_t SourceFreq) ATTR_ALWAYS_INLINE; - static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source, - const uint32_t SourceFreq) - { - return false // TODO - } - - /* Disable C linkage for C++ Compilers: */ - #if defined(__cplusplus) - } - #endif - -#endif - -/** @} */ +/* + LUFA Library + Copyright (C) Dean Camera, 2012. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Module Clock Driver for the AVR USB XMEGA microcontrollers. + * + * Clock management driver for the AVR USB XMEGA microcontrollers. This driver allows for the configuration + * of the various clocks within the device to clock the various peripherals. + */ + +/** \ingroup Group_PlatformDrivers_XMEGA + * \defgroup Group_PlatformDrivers_XMEGAClocks Clock Management Driver - LUFA/Platform/XMEGA/ClockManagement.h + * \brief Module Clock Driver for the AVR USB XMEGA microcontrollers. + * + * \section Sec_Dependencies Module Source Dependencies + * The following files must be built with any user project that uses this module: + * - None + * + * \section Sec_ModDescription Module Description + * Clock management driver for the AVR USB XMEGA microcontrollers. This driver allows for the configuration + * of the various clocks within the device to clock the various peripherals. + * + * Usage Example: + * \code + * #include + * + * void main(void) + * { + * // Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it + * XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, 32000000); + * XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL, F_CPU); + * + * // Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference + * XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ); + * XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, 48000000); + * } + * \endcode + * + * @{ + */ + +#ifndef _XMEGA_CLOCK_MANAGEMENT_H_ +#define _XMEGA_CLOCK_MANAGEMENT_H_ + + /* Includes: */ + #include + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** Enum for the possible external oscillator frequency ranges. */ + enum XMEGA_Extern_OSC_ClockFrequency_t + { + EXOSC_FREQ_2MHZ_MAX = OSC_FRQRANGE_04TO2_gc, /**< External crystal oscillator equal to or slower than 2MHz. */ + EXOSC_FREQ_9MHZ_MAX = OSC_FRQRANGE_2TO9_gc, /**< External crystal oscillator equal to or slower than 9MHz. */ + EXOSC_FREQ_12MHZ_MAX = OSC_FRQRANGE_9TO12_gc, /**< External crystal oscillator equal to or slower than 12MHz. */ + EXOSC_FREQ_16MHZ_MAX = OSC_FRQRANGE_12TO16_gc, /**< External crystal oscillator equal to or slower than 16MHz. */ + }; + + /** Enum for the possible external oscillator statup times. */ + enum XMEGA_Extern_OSC_ClockStartup_t + { + EXOSC_START_6CLK = OSC_XOSCSEL_EXTCLK_gc, /**< Wait 6 clock cycles before startup (external clock). */ + EXOSC_START_32KCLK = OSC_XOSCSEL_32KHz_gc, /**< Wait 32K clock cycles before startup (32.768KHz crystal). */ + EXOSC_START_256CLK = OSC_XOSCSEL_XTAL_256CLK_gc, /**< Wait 256 clock cycles before startup. */ + EXOSC_START_1KCLK = OSC_XOSCSEL_XTAL_1KCLK_gc, /**< Wait 1K clock cycles before startup. */ + EXOSC_START_16KCLK = OSC_XOSCSEL_XTAL_16KCLK_gc, /**< Wait 16K clock cycles before startup. */ + }; + + /** Enum for the possible module clock sources. */ + enum XMEGA_System_ClockSource_t + { + CLOCK_SRC_INT_RC2MHZ = 0, /**< Clock sourced from the Internal 2MHz RC Oscillator clock. */ + CLOCK_SRC_INT_RC32MHZ = 1, /**< Clock sourced from the Internal 32MHz RC Oscillator clock. */ + CLOCK_SRC_INT_RC32KHZ = 2, /**< Clock sourced from the Internal 32KHz RC Oscillator clock. */ + CLOCK_SRC_XOSC = 3, /**< Clock sourced from the External Oscillator clock. */ + CLOCK_SRC_PLL = 4, /**< Clock sourced from the Internal PLL clock. */ + }; + + /** Enum for the possible DFLL clock reference sources. */ + enum XMEGA_System_DFLLReference_t + { + DFLL_REF_INT_RC32KHZ = 0, /**< Reference clock sourced from the Internal 32KHz RC Oscillator clock. */ + DFLL_REF_EXT_RC32KHZ = 1, /**< Reference clock sourced from the External 32KHz RC Oscillator clock connected to TOSC pins. */ + DFLL_REF_INT_USBSOF = 2, /**< Reference clock sourced from the USB Start Of Frame packets. */ + }; + + /* Inline Functions: */ + /** Starts the external oscillator of the XMEGA microcontroller, with the given options. This routine blocks until + * the oscillator is ready for use. + * + * \param[in] FreqRange Frequency range of the external oscillator, a value from \ref XMEGA_Extern_OSC_ClockFrequency_t. + * \param[in] Startup Statup time of the external oscillator, a value from \ref XMEGA_Extern_OSC_ClockStartup_t. + * + * \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_StartExternalOscillator(const uint8_t FreqRange, + const uint8_t Startup) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_StartExternalOscillator(const uint8_t FreqRange, + const uint8_t Startup) + { + OSC.XOSCCTRL = (FreqRange | ((Startup == EXOSC_START_32KCLK) ? OSC_X32KLPM_bm : 0) | Startup); + OSC.CTRL |= OSC_XOSCEN_bm; + + while (!(OSC.STATUS & OSC_XOSCRDY_bm)); + return true; + } + + /** Stops the external oscillator of the XMEGA microcontroller. */ + static inline void XMEGACLK_StopExternalOscillator(void) ATTR_ALWAYS_INLINE; + static inline void XMEGACLK_StopExternalOscillator(void) + { + OSC.CTRL &= ~OSC_XOSCEN_bm; + } + + /** Starts the given internal oscillator of the XMEGA microcontroller, with the given options. This routine blocks until + * the oscillator is ready for use. + * + * \param[in] Source Internal oscillator to start, a value from \ref XMEGA_System_ClockSource_t. + * + * \return Boolean \c true if the internal oscillator was successfully started, \c false if invalid parameters specified. + */ + static inline uint8_t XMEGACLK_StartInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE; + static inline uint8_t XMEGACLK_StartInternalOscillator(const uint8_t Source) + { + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + OSC.CTRL |= OSC_RC2MEN_bm; + while (!(OSC.STATUS & OSC_RC2MRDY_bm)); + return true; + case CLOCK_SRC_INT_RC32MHZ: + OSC.CTRL |= OSC_RC32MEN_bm; + while (!(OSC.STATUS & OSC_RC32MRDY_bm)); + return true; + case CLOCK_SRC_INT_RC32KHZ: + OSC.CTRL |= OSC_RC32KEN_bm; + while (!(OSC.STATUS & OSC_RC32KRDY_bm)); + return true; + } + + return false; + } + + /** Stops the given internal oscillator of the XMEGA microcontroller. + * + * \param[in] Source Internal oscillator to stop, a value from \ref XMEGA_System_ClockSource_t. + * + * \return Boolean \c true if the internal oscillator was successfully stopped, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_StopInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_StopInternalOscillator(const uint8_t Source) + { + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + OSC.CTRL &= ~OSC_RC2MEN_bm; + return true; + case CLOCK_SRC_INT_RC32MHZ: + OSC.CTRL &= ~OSC_RC32MEN_bm; + return true; + case CLOCK_SRC_INT_RC32KHZ: + OSC.CTRL &= ~OSC_RC32KEN_bm; + return true; + } + + return false; + } + + /** Starts the PLL of the XMEGA microcontroller, with the given options. This routine blocks until the PLL is ready for use. + * + * \note The output frequency must be equal to or greater than the source frequency. + * + * \param[in] Source Clock source for the PLL, a value from \ref XMEGA_System_ClockSource_t. + * \param[in] SourceFreq Frequency of the PLL's clock source, in Hz. + * \param[in] Frequency Target frequency of the PLL's output. + * + * \return Boolean \c true if the PLL was successfully started, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_StartPLL(const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_StartPLL(const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) + { + uint8_t MulFactor = (Frequency / SourceFreq); + + if (SourceFreq > Frequency) + return false; + + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + OSC.PLLCTRL = (OSC_PLLSRC_RC2M_gc | MulFactor); + break; + case CLOCK_SRC_INT_RC32MHZ: + OSC.PLLCTRL = (OSC_PLLSRC_RC32M_gc | MulFactor); + break; + case CLOCK_SRC_XOSC: + OSC.PLLCTRL = (OSC_PLLSRC_XOSC_gc | MulFactor); + break; + default: + return false; + } + + OSC.CTRL |= OSC_PLLEN_bm; + + while (!(OSC.STATUS & OSC_PLLRDY_bm)); + return true; + } + + /** Stops the PLL of the XMEGA microcontroller. */ + static inline void XMEGACLK_StopPLL(void) ATTR_ALWAYS_INLINE; + static inline void XMEGACLK_StopPLL(void) + { + OSC.CTRL &= ~OSC_PLLEN_bm; + } + + /** Starts the DFLL of the XMEGA microcontroller, with the given options. + * + * \param[in] Source RC Clock source for the DFLL, a value from \ref XMEGA_System_ClockSource_t. + * \param[in] Reference Reference clock source for the DFLL, an value from \ref XMEGA_System_DFLLReference_t + * \param[in] Frequency Target frequency of the DFLL's output. + * + * \return Boolean \c true if the DFLL was successfully started, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_StartDFLL(const uint8_t Source, + const uint8_t Reference, + const uint32_t Frequency) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_StartDFLL(const uint8_t Source, + const uint8_t Reference, + const uint32_t Frequency) + { + uint16_t DFLLCompare = (Frequency / 1000); + + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + OSC.DFLLCTRL |= (Reference << OSC_RC2MCREF_bp); + DFLLRC2M.COMP1 = (DFLLCompare & 0xFF); + DFLLRC2M.COMP2 = (DFLLCompare >> 8); + DFLLRC2M.CTRL = DFLL_ENABLE_bm; + break; + case CLOCK_SRC_INT_RC32MHZ: + OSC.DFLLCTRL |= (Reference << OSC_RC32MCREF_gp); + DFLLRC32M.COMP1 = (DFLLCompare & 0xFF); + DFLLRC32M.COMP2 = (DFLLCompare >> 8); + + if (Reference == DFLL_REF_INT_USBSOF) + { + NVM.CMD = NVM_CMD_READ_CALIB_ROW_gc; + DFLLRC32M.CALA = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, USBRCOSCA)); + DFLLRC32M.CALB = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, USBRCOSC)); + NVM.CMD = 0; + } + + DFLLRC32M.CTRL = DFLL_ENABLE_bm; + break; + default: + return false; + } + + return true; + } + + /** Stops the given DFLL of the XMEGA microcontroller. + * + * \param[in] Source RC Clock source for the DFLL to be stopped, a value from \ref XMEGA_System_ClockSource_t. + * + * \return Boolean \c true if the DFLL was successfully stopped, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_StopDFLL(const uint8_t Source) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_StopDFLL(const uint8_t Source) + { + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + DFLLRC2M.CTRL = 0; + break; + case CLOCK_SRC_INT_RC32MHZ: + DFLLRC32M.CTRL = 0; + break; + default: + return false; + } + + return true; + } + + /** Sets the clock source for the main microcontroller core. The given clock source should be configured + * and ready for use before this function is called. + * + * \param[in] Source Clock source for the CPU core, a value from \ref XMEGA_System_ClockSource_t. + * + * \return Boolean \c true if the CPU core clock was sucessfully altered, \c false if invalid parameters specified. + */ + static inline bool XMEGACLK_SetCPUClockSource(const uint8_t Source) ATTR_ALWAYS_INLINE; + static inline bool XMEGACLK_SetCPUClockSource(const uint8_t Source) + { + uint8_t ClockSourceMask = 0; + + switch (Source) + { + case CLOCK_SRC_INT_RC2MHZ: + ClockSourceMask = CLK_SCLKSEL_RC2M_gc; + break; + case CLOCK_SRC_INT_RC32MHZ: + ClockSourceMask = CLK_SCLKSEL_RC32M_gc; + break; + case CLOCK_SRC_INT_RC32KHZ: + ClockSourceMask = CLK_SCLKSEL_RC32K_gc; + break; + case CLOCK_SRC_XOSC: + ClockSourceMask = CLK_SCLKSEL_XOSC_gc; + break; + case CLOCK_SRC_PLL: + ClockSourceMask = CLK_SCLKSEL_PLL_gc; + break; + default: + return false; + } + + uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask(); + GlobalInterruptDisable(); + + CCP = CCP_IOREG_gc; + CLK_CTRL = ClockSourceMask; + + SetGlobalInterruptMask(CurrentGlobalInt); + + Delay_MS(1); + return (CLK.CTRL == ClockSourceMask); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ +