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Diffstat (limited to 'lib/lufa/LUFA/Platform/XMEGA/ClockManagement.h')
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1 files changed, 397 insertions, 0 deletions
diff --git a/lib/lufa/LUFA/Platform/XMEGA/ClockManagement.h b/lib/lufa/LUFA/Platform/XMEGA/ClockManagement.h new file mode 100644 index 0000000000..eb941d9a30 --- /dev/null +++ b/lib/lufa/LUFA/Platform/XMEGA/ClockManagement.h @@ -0,0 +1,397 @@ +/* + 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 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_PlatformDrivers_XMEGAClocks_Dependencies Module Source Dependencies + * The following files must be built with any user project that uses this module: + * - None + * + * \section Sec_PlatformDrivers_XMEGAClocks_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 PLL to multiply the 2MHz RC oscillator to F_CPU and switch the CPU core to run from it + * XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU); + * XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL); + * + * // Start the 32MHz internal RC oscillator and start the DFLL to increase it to F_USB using the USB SOF as a reference + * XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ); + * XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB); + * } + * \endcode + * + * @{ + */ + +#ifndef _XMEGA_CLOCK_MANAGEMENT_H_ +#define _XMEGA_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 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 startup 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: */ + /** Write a value to a location protected by the XMEGA CCP protection mechanism. This function uses inline assembly to ensure that + * the protected address is written to within four clock cycles of the CCP key being written. + * + * \param[in] Address Address to write to, a memory address protected by the CCP mechanism + * \param[in] Value Value to write to the protected location + */ + static inline void XMEGACLK_CCP_Write(volatile void* Address, const uint8_t Value) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE; + static inline void XMEGACLK_CCP_Write(volatile void* Address, const uint8_t Value) + { + __asm__ __volatile__ ( + "out %0, __zero_reg__" "\n\t" /* Zero RAMPZ using fixed zero value register */ + "movw r30, %1" "\n\t" /* Copy address to Z register pair */ + "out %2, %3" "\n\t" /* Write key to CCP register */ + "st Z, %4" "\n\t" /* Indirectly write value to address */ + : /* No output operands */ + : /* Input operands: */ "m" (RAMPZ), "e" (Address), "m" (CCP), "r" (CCP_IOREG_gc), "r" (Value) + : /* Clobbered registers: */ "r30", "r31" + ); + } + + /** 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 Startup 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 bool XMEGACLK_StartInternalOscillator(const uint8_t Source) ATTR_ALWAYS_INLINE; + static inline bool 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; + default: + 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; + default: + return false; + } + } + + /** Starts the PLL of the XMEGA 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] 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; + + if (MulFactor > 31) + 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 / 1024); + + 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 successfully 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(); + + XMEGACLK_CCP_Write(&CLK.CTRL, ClockSourceMask); + + SetGlobalInterruptMask(CurrentGlobalInt); + + Delay_MS(1); + return (CLK.CTRL == ClockSourceMask); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |