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Diffstat (limited to 'lib/lufa/LUFA/Platform/UC3/ClockManagement.h')
| -rw-r--r-- | lib/lufa/LUFA/Platform/UC3/ClockManagement.h | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/lib/lufa/LUFA/Platform/UC3/ClockManagement.h b/lib/lufa/LUFA/Platform/UC3/ClockManagement.h new file mode 100644 index 0000000000..5f286d51d5 --- /dev/null +++ b/lib/lufa/LUFA/Platform/UC3/ClockManagement.h @@ -0,0 +1,338 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 disclaims 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 AVR32 UC3 microcontrollers. + * + * Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration + * of the various clocks within the device to clock the various peripherals. + */ + +/** \ingroup Group_PlatformDrivers_UC3 + * \defgroup Group_PlatformDrivers_UC3Clocks Clock Management Driver - LUFA/Platform/UC3/ClockManagement.h + * \brief Module Clock Driver for the AVR32 UC3 microcontrollers. + * + * \section Sec_PlatformDrivers_UC3Clocks_Dependencies Module Source Dependencies + * The following files must be built with any user project that uses this module: + * - None + * + * \section Sec_PlatformDrivers_UC3Clocks_ModDescription Module Description + * Clock management driver for the AVR32 UC3 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/UC3/ClockManagement.h> + * + * void main(void) + * { + * // Start the master external oscillator which will be used as the main clock reference + * UC3CLK_StartExternalOscillator(0, EXOSC_MODE_8MHZ_OR_MORE, EXOSC_START_0CLK); + * + * // Start the PLL for the CPU clock, switch CPU to it + * UC3CLK_StartPLL(0, CLOCK_SRC_OSC0, 12000000, F_CPU); + * UC3CLK_SetCPUClockSource(CLOCK_SRC_PLL0, F_CPU); + * + * // Start the PLL for the USB Generic Clock module + * UC3CLK_StartPLL(1, CLOCK_SRC_OSC0, 12000000, 48000000); + * } + * \endcode + * + * @{ + */ + +#ifndef _UC3_CLOCK_MANAGEMENT_H_ +#define _UC3_CLOCK_MANAGEMENT_H_ + + /* Includes: */ + #include "../../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 types. */ + enum UC3_Extern_OSC_ClockTypes_t + { + EXOSC_MODE_CLOCK = AVR32_PM_OSCCTRL0_MODE_EXT_CLOCK, /**< External clock (non-crystal) mode. */ + EXOSC_MODE_900KHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G0, /**< External crystal oscillator equal to or slower than 900KHz. */ + EXOSC_MODE_3MHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G1, /**< External crystal oscillator equal to or slower than 3MHz. */ + EXOSC_MODE_8MHZ_MAX = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G2, /**< External crystal oscillator equal to or slower than 8MHz. */ + EXOSC_MODE_8MHZ_OR_MORE = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G3, /**< External crystal oscillator equal to or faster than 8MHz. */ + }; + + /** Enum for the possible external oscillator startup times. */ + enum UC3_Extern_OSC_ClockStartup_t + { + EXOSC_START_0CLK = AVR32_PM_OSCCTRL0_STARTUP_0_RCOSC, /**< Immediate startup, no delay. */ + EXOSC_START_64CLK = AVR32_PM_OSCCTRL0_STARTUP_64_RCOSC, /**< Wait 64 clock cycles before startup for stability. */ + EXOSC_START_128CLK = AVR32_PM_OSCCTRL0_STARTUP_128_RCOSC, /**< Wait 128 clock cycles before startup for stability. */ + EXOSC_START_2048CLK = AVR32_PM_OSCCTRL0_STARTUP_2048_RCOSC, /**< Wait 2048 clock cycles before startup for stability. */ + EXOSC_START_4096CLK = AVR32_PM_OSCCTRL0_STARTUP_4096_RCOSC, /**< Wait 4096 clock cycles before startup for stability. */ + EXOSC_START_8192CLK = AVR32_PM_OSCCTRL0_STARTUP_8192_RCOSC, /**< Wait 8192 clock cycles before startup for stability. */ + EXOSC_START_16384CLK = AVR32_PM_OSCCTRL0_STARTUP_16384_RCOSC, /**< Wait 16384 clock cycles before startup for stability. */ + }; + + /** Enum for the possible module clock sources. */ + enum UC3_System_ClockSource_t + { + CLOCK_SRC_SLOW_CLK = 0, /**< Clock sourced from the internal slow clock. */ + CLOCK_SRC_OSC0 = 1, /**< Clock sourced from the Oscillator 0 clock. */ + CLOCK_SRC_OSC1 = 2, /**< Clock sourced from the Oscillator 1 clock. */ + CLOCK_SRC_PLL0 = 3, /**< Clock sourced from the PLL 0 clock. */ + CLOCK_SRC_PLL1 = 4, /**< Clock sourced from the PLL 1 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 UC3_Extern_OSC_ClockTypes_t. + * \param[in] Startup Startup time of the external oscillator, a value from \ref UC3_Extern_OSC_ClockStartup_t. + * + * \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified. + */ + static inline bool UC3CLK_StartExternalOscillator(const uint8_t Channel, + const uint8_t Type, + const uint8_t Startup) ATTR_ALWAYS_INLINE; + static inline bool UC3CLK_StartExternalOscillator(const uint8_t Channel, + const uint8_t Type, + const uint8_t Startup) + { + switch (Channel) + { + case 0: + AVR32_PM.OSCCTRL0.startup = Startup; + AVR32_PM.OSCCTRL0.mode = Type; + break; + case 1: + AVR32_PM.OSCCTRL1.startup = Startup; + AVR32_PM.OSCCTRL1.mode = Type; + break; + default: + return false; + } + + AVR32_PM.mcctrl |= (1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel)); + + while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_OSC0RDY_OFFSET + Channel)))); + return true; + } + + /** Stops the given external oscillator of the UC3 microcontroller. + * + * \param[in] Channel Index of the external oscillator to stop. + */ + static inline void UC3CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE; + static inline void UC3CLK_StopExternalOscillator(const uint8_t Channel) + { + AVR32_PM.mcctrl &= ~(1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel)); + } + + /** Starts the given PLL of the UC3 microcontroller, with the given options. This routine blocks until the PLL is ready for use. + * + * \attention The output frequency must be equal to or greater than the source frequency. + * + * \param[in] Channel Index of the PLL to start. + * \param[in] Source Clock source for the PLL, a value from \ref UC3_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 UC3CLK_StartPLL(const uint8_t Channel, + const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) ATTR_ALWAYS_INLINE; + static inline bool UC3CLK_StartPLL(const uint8_t Channel, + const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) + { + if (SourceFreq > Frequency) + return false; + + switch (Source) + { + case CLOCK_SRC_OSC0: + AVR32_PM.PLL[Channel].pllosc = 0; + break; + case CLOCK_SRC_OSC1: + AVR32_PM.PLL[Channel].pllosc = 1; + break; + default: + return false; + } + + AVR32_PM.PLL[Channel].pllmul = (Frequency / SourceFreq) ? (((Frequency / SourceFreq) - 1) / 2) : 0; + AVR32_PM.PLL[Channel].plldiv = 0; + AVR32_PM.PLL[Channel].pllen = true; + + while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_LOCK0_OFFSET + Channel)))); + return true; + } + + /** Stops the given PLL of the UC3 microcontroller. + * + * \param[in] Channel Index of the PLL to stop. + */ + static inline void UC3CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE; + static inline void UC3CLK_StopPLL(const uint8_t Channel) + { + AVR32_PM.PLL[Channel].pllen = false; + } + + /** 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 UC3_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 UC3CLK_StartGenericClock(const uint8_t Channel, + const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) ATTR_ALWAYS_INLINE; + static inline bool UC3CLK_StartGenericClock(const uint8_t Channel, + const uint8_t Source, + const uint32_t SourceFreq, + const uint32_t Frequency) + { + if (Channel >= AVR32_PM_GCLK_NUM) + return false; + + if (SourceFreq < Frequency) + return false; + + switch (Source) + { + case CLOCK_SRC_OSC0: + AVR32_PM.GCCTRL[Channel].pllsel = false; + AVR32_PM.GCCTRL[Channel].oscsel = 0; + break; + case CLOCK_SRC_OSC1: + AVR32_PM.GCCTRL[Channel].pllsel = false; + AVR32_PM.GCCTRL[Channel].oscsel = 1; + break; + case CLOCK_SRC_PLL0: + AVR32_PM.GCCTRL[Channel].pllsel = true; + AVR32_PM.GCCTRL[Channel].oscsel = 0; + break; + case CLOCK_SRC_PLL1: + AVR32_PM.GCCTRL[Channel].pllsel = true; + AVR32_PM.GCCTRL[Channel].oscsel = 1; + break; + default: + return false; + } + + AVR32_PM.GCCTRL[Channel].diven = (SourceFreq > Frequency) ? true : false; + AVR32_PM.GCCTRL[Channel].div = (((SourceFreq / Frequency) - 1) / 2); + AVR32_PM.GCCTRL[Channel].cen = true; + + return true; + } + + /** Stops the given generic clock of the UC3 microcontroller. + * + * \param[in] Channel Index of the generic clock to stop. + * + * \return Boolean \c true if the generic clock was successfully stopped, \c false if invalid parameters specified. + */ + static inline bool UC3CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE; + static inline bool UC3CLK_StopGenericClock(const uint8_t Channel) + { + if (Channel >= AVR32_PM_GCLK_NUM) + return false; + + AVR32_PM.GCCTRL[Channel].cen = 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. + * + * 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 UC3_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 successfully altered, \c false if invalid parameters specified. + */ + static inline bool UC3CLK_SetCPUClockSource(const uint8_t Source, + const uint32_t SourceFreq) ATTR_ALWAYS_INLINE; + static inline bool UC3CLK_SetCPUClockSource(const uint8_t Source, + const uint32_t SourceFreq) + { + if (SourceFreq > AVR32_PM_CPU_MAX_FREQ) + return false; + + AVR32_FLASHC.FCR.fws = (SourceFreq > AVR32_FLASHC_FWS_0_MAX_FREQ) ? true : false; + + switch (Source) + { + #if defined(AVR32_PM_MCCTRL_MCSEL_SLOW) + case CLOCK_SRC_SLOW_CLK: + AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_SLOW; + break; + #endif + #if defined(AVR32_PM_MCCTRL_MCSEL_OSC0) + case CLOCK_SRC_OSC0: + AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_OSC0; + break; + #endif + #if defined(AVR32_PM_MCCTRL_MCSEL_PLL0) + case CLOCK_SRC_PLL0: + AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_PLL0; + break; + #endif + default: + return false; + } + + return true; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |