Squashed 'lib/lufa/' content from commit 385d40300

git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b

2 files changed, 398 insertions, 0 deletions

diff --git a/LUFA/Platform/XMEGA/ClockManagement.h b/LUFA/Platform/XMEGA/ClockManagement.h
new file mode 100644
index 0000000000..eb941d9a30
--- /dev/null
+++ b/LUFA/Platform/XMEGA/ClockManagement.h
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+/*
+             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
+
+/** @} */
+
diff --git a/LUFA/Platform/XMEGA/XMEGAExperimentalInfo.txt b/LUFA/Platform/XMEGA/XMEGAExperimentalInfo.txt
new file mode 100644
index 0000000000..42144aac48
--- /dev/null
+++ b/LUFA/Platform/XMEGA/XMEGAExperimentalInfo.txt
@@ -0,0 +1 @@
+Please note that the XMEGA architecture support is EXPERIMENTAL at this time, and may be non-functional/incomplete in some areas. Please refer to the Known Issues section of the LUFA manual.
\ No newline at end of file