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-rw-r--r--LUFA/Platform/XMEGA/ClockManagement.h596
1 files changed, 298 insertions, 298 deletions
diff --git a/LUFA/Platform/XMEGA/ClockManagement.h b/LUFA/Platform/XMEGA/ClockManagement.h
index 9e6a0f4b1..62e9284d3 100644
--- a/LUFA/Platform/XMEGA/ClockManagement.h
+++ b/LUFA/Platform/XMEGA/ClockManagement.h
@@ -1,298 +1,298 @@
-/*
- 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 <LUFA/Platform/XMEGA/ClockManagement.h>
- *
- * void main(void)
- * {
- * // Start the internal 32MHz RC oscillator and switch the CPU core to run from it
- * AVR32CLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
- * XMEGACLK_SetCPUClockSource(CLOCK_SRC_INT_RC32MHZ, F_CPU);
- *
- * // Start the external oscillator and multiply up the frequency
- * AVR32CLK_StartExternalOscillator(EXOSC_FREQ_9MHZ_MAX, EXOSC_START_1KCLK);
- * AVR32CLK_StartPLL(CLOCK_SRC_XOSC, 8000000, F_USB);
- * }
- * \endcode
- *
- * @{
- */
-
-#ifndef _XMEGA_CLOCK_MANAGEMENT_H_
-#define _XMEGA_CLOCK_MANAGEMENT_H_
-
- /* Includes: */
- #include <LUFA/Common/Common.h>
-
- /* 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. */
- };
-
- /* 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 AVR32CLK_StartExternalOscillator(const uint8_t FreqRange,
- const uint8_t Startup) ATTR_ALWAYS_INLINE;
- static inline bool AVR32CLK_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 AVR32CLK_StopExternalOscillator(void) ATTR_ALWAYS_INLINE;
- static inline void AVR32CLK_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 AVR32CLK_StartInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE;
- static inline uint8_t AVR32CLK_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 AVR32CLK_StopInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE;
- static inline bool AVR32CLK_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 AVR32CLK_StartPLL(const uint8_t Source,
- const uint32_t SourceFreq,
- const uint32_t Frequency) ATTR_ALWAYS_INLINE;
- static inline bool AVR32CLK_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 AVR32CLK_StopPLL(void) ATTR_ALWAYS_INLINE;
- static inline void AVR32CLK_StopPLL(void)
- {
- OSC.CTRL &= ~OSC_PLLEN_bm;
- }
-
- /** 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.
- * \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 XMEGACLK_SetCPUClockSource(const uint8_t Source,
- const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
- static inline bool XMEGACLK_SetCPUClockSource(const uint8_t Source,
- const uint32_t SourceFreq)
- {
- 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
-
-/** @} */
+/*
+ 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 <LUFA/Platform/XMEGA/ClockManagement.h>
+ *
+ * void main(void)
+ * {
+ * // Start the internal 32MHz RC oscillator and switch the CPU core to run from it
+ * AVR32CLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
+ * XMEGACLK_SetCPUClockSource(CLOCK_SRC_INT_RC32MHZ, F_CPU);
+ *
+ * // Start the external oscillator and multiply up the frequency
+ * AVR32CLK_StartExternalOscillator(EXOSC_FREQ_9MHZ_MAX, EXOSC_START_1KCLK);
+ * AVR32CLK_StartPLL(CLOCK_SRC_XOSC, 8000000, F_USB);
+ * }
+ * \endcode
+ *
+ * @{
+ */
+
+#ifndef _XMEGA_CLOCK_MANAGEMENT_H_
+#define _XMEGA_CLOCK_MANAGEMENT_H_
+
+ /* Includes: */
+ #include <LUFA/Common/Common.h>
+
+ /* 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. */
+ };
+
+ /* 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 AVR32CLK_StartExternalOscillator(const uint8_t FreqRange,
+ const uint8_t Startup) ATTR_ALWAYS_INLINE;
+ static inline bool AVR32CLK_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 AVR32CLK_StopExternalOscillator(void) ATTR_ALWAYS_INLINE;
+ static inline void AVR32CLK_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 AVR32CLK_StartInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE;
+ static inline uint8_t AVR32CLK_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 AVR32CLK_StopInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE;
+ static inline bool AVR32CLK_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 AVR32CLK_StartPLL(const uint8_t Source,
+ const uint32_t SourceFreq,
+ const uint32_t Frequency) ATTR_ALWAYS_INLINE;
+ static inline bool AVR32CLK_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 AVR32CLK_StopPLL(void) ATTR_ALWAYS_INLINE;
+ static inline void AVR32CLK_StopPLL(void)
+ {
+ OSC.CTRL &= ~OSC_PLLEN_bm;
+ }
+
+ /** 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.
+ * \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 XMEGACLK_SetCPUClockSource(const uint8_t Source,
+ const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
+ static inline bool XMEGACLK_SetCPUClockSource(const uint8_t Source,
+ const uint32_t SourceFreq)
+ {
+ 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
+
+/** @} */
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