LUFA/Platform/UC3/ClockManagement.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *  \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
  33  *
  34  *  Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
  35  *  of the various clocks within the device to clock the various peripherals.
  36  */
  37
  38 /** \ingroup Group_PlatformDrivers_UC3
  39  *  \defgroup Group_PlatformDrivers_UC3Clocks Clock Management Driver - LUFA/Platform/UC3/ClockManagement.h
  40  *  \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
  41  *
  42  *  \section Sec_Dependencies Module Source Dependencies
  43  *  The following files must be built with any user project that uses this module:
  44  *    - None
  45  *
  46  *  \section Sec_ModDescription Module Description
  47  *  Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
  48  *  of the various clocks within the device to clock the various peripherals.
  49  *
  50  *  Usage Example:
  51  *  \code
  52  *              #include <LUFA/Platform/UC3/ClockManagement.h>
  53  *
  54  *              void main(void)
  55  *              {
  56  *                      // Start the master external oscillator which will be used as the main clock reference
  57  *                      AVR32CLK_StartExternalOscillator(0, EXOSC_MODE_8MHZ_OR_MORE, EXOSC_START_0CLK);
  58  *
  59  *                      // Start the PLL for the CPU clock, switch CPU to it
  60  *                      AVR32CLK_StartPLL(0, CLOCK_SRC_OSC0, 12000000, F_CPU);
  61  *                      AVR32CLK_SetCPUClockSource(CLOCK_SRC_PLL0, F_CPU);
  62  *
  63  *                      // Start the PLL for the USB Generic Clock module
  64  *                      AVR32CLK_StartPLL(1, CLOCK_SRC_OSC0, 12000000, 48000000);
  65  *              }
  66  *  \endcode
  67  *
  68  *  @{
  69  */
  70
  71 #ifndef _UC3_CLOCK_MANAGEMENT_H_
  72 #define _UC3_CLOCK_MANAGEMENT_H_
  73
  74         /* Includes: */
  75                 #include <LUFA/Common/Common.h>
  76
  77         /* Enable C linkage for C++ Compilers: */
  78                 #if defined(__cplusplus)
  79                         extern "C" {
  80                 #endif
  81
  82         /* Public Interface - May be used in end-application: */
  83                 /* Macros: */
  84                         /** Enum for the possible external oscillator types. */
  85                         enum UC3_Extern_OSC_ClockTypes_t
  86                         {
  87                                 EXOSC_MODE_CLOCK         = AVR32_PM_OSCCTRL0_MODE_EXT_CLOCK,  /**< External clock (non-crystal) mode. */
  88                                 EXOSC_MODE_900KHZ_MAX    = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G0, /**< External crystal oscillator equal to or slower than 900KHz. */
  89                                 EXOSC_MODE_3MHZ_MAX      = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G1, /**< External crystal oscillator equal to or slower than 3MHz. */
  90                                 EXOSC_MODE_8MHZ_MAX      = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G2, /**< External crystal oscillator equal to or slower than 8MHz. */
  91                                 EXOSC_MODE_8MHZ_OR_MORE  = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G3, /**< External crystal oscillator equal to or faster than 8MHz. */
  92                         };
  93
  94                         /** Enum for the possible external oscillator statup times. */
  95                         enum UC3_Extern_OSC_ClockStartup_t
  96                         {
  97                                 EXOSC_START_0CLK         = AVR32_PM_OSCCTRL0_STARTUP_0_RCOSC,     /**< Immediate startup, no delay. */
  98                                 EXOSC_START_64CLK        = AVR32_PM_OSCCTRL0_STARTUP_64_RCOSC,    /**< Wait 64 clock cyles before startup for stability. */
  99                                 EXOSC_START_128CLK       = AVR32_PM_OSCCTRL0_STARTUP_128_RCOSC,   /**< Wait 128 clock cyles before startup for stability. */
 100                                 EXOSC_START_2048CLK      = AVR32_PM_OSCCTRL0_STARTUP_2048_RCOSC,  /**< Wait 2048 clock cyles before startup for stability. */
 101                                 EXOSC_START_4096CLK      = AVR32_PM_OSCCTRL0_STARTUP_4096_RCOSC,  /**< Wait 4096 clock cyles before startup for stability. */
 102                                 EXOSC_START_8192CLK      = AVR32_PM_OSCCTRL0_STARTUP_8192_RCOSC,  /**< Wait 8192 clock cyles before startup for stability. */
 103                                 EXOSC_START_16384CLK     = AVR32_PM_OSCCTRL0_STARTUP_16384_RCOSC, /**< Wait 16384 clock cyles before startup for stability. */
 104                         };
 105
 106                         /** Enum for the possible module clock sources. */
 107                         enum UC3_System_ClockSource_t
 108                         {
 109                                 CLOCK_SRC_SLOW_CLK       = 0, /**< Clock sourced from the internal slow clock. */
 110                                 CLOCK_SRC_OSC0           = 1, /**< Clock sourced from the Oscillator 0 clock. */
 111                                 CLOCK_SRC_OSC1           = 2, /**< Clock sourced from the Oscillator 1 clock. */
 112                                 CLOCK_SRC_PLL0           = 3, /**< Clock sourced from the PLL 0 clock. */
 113                                 CLOCK_SRC_PLL1           = 4, /**< Clock sourced from the PLL 1 clock. */
 114                         };
 115
 116                 /* Inline Functions: */
 117                         /** Starts the given external oscillator of the UC3 microcontroller, with the given options. This routine blocks until
 118                          *  the oscillator is ready for use.
 119                          *
 120                          *  \param[in] Channel  Index of the external oscillator to start.
 121                          *  \param[in] Type     Type of clock attached to the given oscillator channel, a value from \ref UC3_Extern_OSC_ClockTypes_t.
 122                          *  \param[in] Startup  Statup time of the external oscillator, a value from \ref UC3_Extern_OSC_ClockStartup_t.
 123                          *
 124                          *  \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified.
 125                          */
 126                         static inline bool AVR32CLK_StartExternalOscillator(const uint8_t Channel,
 127                                                                             const uint8_t Type,
 128                                                                             const uint8_t Startup) ATTR_ALWAYS_INLINE;
 129                         static inline bool AVR32CLK_StartExternalOscillator(const uint8_t Channel,
 130                                                                             const uint8_t Type,
 131                                                                             const uint8_t Startup)
 132                         {
 133                                 switch (Channel)
 134                                 {
 135                                         case 0:
 136                                                 AVR32_PM.OSCCTRL0.startup = Startup;
 137                                                 AVR32_PM.OSCCTRL0.mode    = Type;
 138                                                 break;
 139                                         case 1:
 140                                                 AVR32_PM.OSCCTRL1.startup = Startup;
 141                                                 AVR32_PM.OSCCTRL1.mode    = Type;
 142                                                 break;
 143                                         default:
 144                                                 return false;
 145                                 }
 146
 147                                 AVR32_PM.mcctrl |= (1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
 148
 149                                 while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_OSC0RDY_OFFSET + Channel))));
 150                                 return true;
 151                         }
 152
 153                         /** Stops the given external oscillator of the UC3 microcontroller.
 154                          *
 155                          *  \param[in] Channel  Index of the external oscillator to stop.
 156                          */
 157                         static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE;
 158                         static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel)
 159                         {
 160                                 AVR32_PM.mcctrl &= ~(1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
 161                         }
 162
 163                         /** Starts the given PLL of the UC3 microcontroller, with the given options. This routine blocks until the PLL is ready for use.
 164                          *
 165                          *  \attention The output frequency must be equal to or greater than the source frequency.
 166                          *
 167                          *  \param[in] Channel     Index of the PLL to start.
 168                          *  \param[in] Source      Clock source for the PLL, a value from \ref UC3_System_ClockSource_t.
 169                          *  \param[in] SourceFreq  Frequency of the PLL's clock source, in Hz.
 170                          *  \param[in] Frequency   Target frequency of the PLL's output.
 171                          *
 172                          *  \return Boolean \c true if the PLL was successfully started, \c false if invalid parameters specified.
 173                          */
 174                         static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
 175                                                              const uint8_t Source,
 176                                                              const uint32_t SourceFreq,
 177                                                              const uint32_t Frequency) ATTR_ALWAYS_INLINE;
 178                         static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
 179                                                              const uint8_t Source,
 180                                                              const uint32_t SourceFreq,
 181                                                              const uint32_t Frequency)
 182                         {
 183                                 if (SourceFreq > Frequency)
 184                                   return false;
 185
 186                                 switch (Source)
 187                                 {
 188                                         case CLOCK_SRC_OSC0:
 189                                                 AVR32_PM.PLL[Channel].pllosc = 0;
 190                                                 break;
 191                                         case CLOCK_SRC_OSC1:
 192                                                 AVR32_PM.PLL[Channel].pllosc = 1;
 193                                                 break;
 194                                         default:
 195                                                 return false;
 196                                 }
 197
 198                                 AVR32_PM.PLL[Channel].pllmul = (Frequency / SourceFreq) ? (((Frequency / SourceFreq) - 1) / 2) : 0;
 199                                 AVR32_PM.PLL[Channel].plldiv = 0;
 200                                 AVR32_PM.PLL[Channel].pllen  = true;
 201
 202                                 while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_LOCK0_OFFSET + Channel))));
 203                                 return true;
 204                         }
 205
 206                         /** Stops the given PLL of the UC3 microcontroller.
 207                          *
 208                          *  \param[in] Channel  Index of the PLL to stop.
 209                          */
 210                         static inline void AVR32CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE;
 211                         static inline void AVR32CLK_StopPLL(const uint8_t Channel)
 212                         {
 213                                 AVR32_PM.PLL[Channel].pllen = false;
 214                         }
 215
 216                         /** Starts the given Generic Clock of the UC3 microcontroller, with the given options.
 217                          *
 218                          *  \param[in] Channel     Index of the Generic Clock to start.
 219                          *  \param[in] Source      Clock source for the Generic Clock, a value from \ref UC3_System_ClockSource_t.
 220                          *  \param[in] SourceFreq  Frequency of the Generic Clock's clock source, in Hz.
 221                          *  \param[in] Frequency   Target frequency of the Generic Clock's output.
 222                          *
 223                          *  \return Boolean \c true if the Generic Clock was successfully started, \c false if invalid parameters specified.
 224                          */
 225                         static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
 226                                                                       const uint8_t Source,
 227                                                                       const uint32_t SourceFreq,
 228                                                                       const uint32_t Frequency) ATTR_ALWAYS_INLINE;
 229                         static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
 230                                                                       const uint8_t Source,
 231                                                                       const uint32_t SourceFreq,
 232                                                                       const uint32_t Frequency)
 233                         {
 234                                 switch (Source)
 235                                 {
 236                                         case CLOCK_SRC_OSC0:
 237                                                 AVR32_PM.GCCTRL[Channel].pllsel = false;
 238                                                 AVR32_PM.GCCTRL[Channel].oscsel = 0;
 239                                                 break;
 240                                         case CLOCK_SRC_OSC1:
 241                                                 AVR32_PM.GCCTRL[Channel].pllsel = false;
 242                                                 AVR32_PM.GCCTRL[Channel].oscsel = 1;
 243                                                 break;
 244                                         case CLOCK_SRC_PLL0:
 245                                                 AVR32_PM.GCCTRL[Channel].pllsel = true;
 246                                                 AVR32_PM.GCCTRL[Channel].oscsel = 0;
 247                                                 break;
 248                                         case CLOCK_SRC_PLL1:
 249                                                 AVR32_PM.GCCTRL[Channel].pllsel = true;
 250                                                 AVR32_PM.GCCTRL[Channel].oscsel = 1;
 251                                                 break;
 252                                         default:
 253                                                 return false;
 254                                 }
 255
 256                                 if (SourceFreq < Frequency)
 257                                   return false;
 258
 259                                 AVR32_PM.GCCTRL[Channel].diven = (SourceFreq > Frequency) ? true : false;
 260                                 AVR32_PM.GCCTRL[Channel].div   = (((SourceFreq / Frequency) - 1) / 2);
 261                                 AVR32_PM.GCCTRL[Channel].cen   = true;
 262
 263                                 return true;
 264                         }
 265
 266                         /** Stops the given generic clock of the UC3 microcontroller.
 267                          *
 268                          *  \param[in] Channel  Index of the generic clock to stop.
 269                          */
 270                         static inline void AVR32CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE;
 271                         static inline void AVR32CLK_StopGenericClock(const uint8_t Channel)
 272                         {
 273                                 AVR32_PM.GCCTRL[Channel].cen = false;
 274                         }
 275
 276                         /** Sets the clock source for the main microcontroller core. The given clock source should be configured
 277                          *  and ready for use before this function is called.
 278                          *
 279                          *  This function will configure the FLASH controller's wait states automatically to suit the given clock source.
 280                          *
 281                          *  \param[in] Source      Clock source for the CPU core, a value from \ref UC3_System_ClockSource_t.
 282                          *  \param[in] SourceFreq  Frequency of the CPU core's clock source, in Hz.
 283                          *
 284                          *  \return Boolean \c true if the CPU core clock was sucessfully altered, \c false if invalid parameters specified.
 285                          */
 286                         static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
 287                                                                       const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
 288                         static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
 289                                                                       const uint32_t SourceFreq)
 290                         {
 291                                 AVR32_FLASHC.FCR.fws = (SourceFreq > 30000000) ? true : false;
 292
 293                                 switch (Source)
 294                                 {
 295                                         #if defined(AVR32_PM_MCCTRL_MCSEL_SLOW)
 296                                         case CLOCK_SRC_SLOW_CLK:
 297                                                 AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_SLOW;
 298                                                 break;
 299                                         #endif
 300                                         #if defined(AVR32_PM_MCCTRL_MCSEL_OSC0)
 301                                         case CLOCK_SRC_OSC0:
 302                                                 AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_OSC0;
 303                                                 break;
 304                                         #endif
 305                                         #if defined(AVR32_PM_MCCTRL_MCSEL_PLL0)
 306                                         case CLOCK_SRC_PLL0:
 307                                                 AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_PLL0;
 308                                                 break;
 309                                         #endif
 310                                         default:
 311                                                 return false;
 312                                 }
 313
 314                                 return true;
 315                         }
 316
 317         /* Disable C linkage for C++ Compilers: */
 318                 #if defined(__cplusplus)
 319                         }
 320                 #endif
 321
 322 #endif
 323
 324 /** @} */
 325