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Enhance and document the AVR32 UC3 platform drivers.

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This commit is contained in:
Dean Camera 2011-07-12 13:32:11 +00:00
parent bd8046976f
commit 5f51554a5e
5 changed files with 398 additions and 174 deletions
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402
LUFA/Platform/UC3/ClockManagement.h
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@ -28,8 +28,48 @@
this software.
*/
#ifndef _CLOCK_MANAGEMENT_H_
#define _CLOCK_MANAGEMENT_H_
/** \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
* \defgroup Group_PlatformDrivers_UC3Clocks UC3 Clock Management Driver - LUFA/Platform/UC3/ClockManagement.h
* \brief Module Clock Driver for the AVR32 UC3 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 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
* AVR32CLK_StartExternalOscillator(0, EXOSC_MODE_8MHZ_OR_MORE, EXOSC_START_0CLK);
*
* // Start the PLL for the CPU clock, switch CPU to it
* AVR32CLK_StartPLL(0, CLOCK_SRC_OSC0, 12000000, F_CPU);
* AVR32CLK_SetCPUClockSource(CLOCK_SRC_PLL0, F_CPU);
*
* // Start the PLL for the USB Generic Clock module
* AVR32CLK_StartPLL(1, CLOCK_SRC_OSC0, 12000000, 48000000);
* }
* \endcode
*
* @{
*/
#ifndef _UC3_CLOCK_MANAGEMENT_H_
#define _UC3_CLOCK_MANAGEMENT_H_
/* Includes: */
#include <avr32/io.h>
@ -38,144 +78,240 @@
#include <LUFA/Common/Common.h>
/* Macros: */
enum Extern_OSC_ClockStartup_t
{
EXOSC_START_0CLK = 0,
EXOSC_START_64CLK = 1,
EXOSC_START_128CLK = 2,
EXOSC_START_2048CLK = 3,
EXOSC_START_4096CLK = 4,
EXOSC_START_8192CLK = 5,
EXOSC_START_16384CLK = 6,
};
enum Extern_OSC_ClockMode_t
{
EXOSC_MODE_CLOCK = 0,
EXOSC_MODE_900KHZ_MAX = 1,
EXOSC_MODE_3MHZ_MAX = 2,
EXOSC_MODE_8MHZ_MAX = 3,
EXOSC_MODE_8MHZ_OR_MORE = 4,
};
enum
{
CLOCK_SRC_SLOW_CLK = 0,
CLOCK_SRC_OSC0 = 1,
CLOCK_SRC_OSC1 = 2,
CLOCK_SRC_PLL0 = 3,
CLOCK_SRC_PLL1 = 4,
};
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
extern "C" {
#endif
/* Inline Functions: */
static inline bool AVR32CLK_StartExternalOscillator(const uint8_t Channel,
const uint8_t Type,
const uint8_t Startup)
{
AVR32_PM.OSCCTRL0.startup = Startup;
AVR32_PM.OSCCTRL0.mode = Type;
AVR32_PM.mcctrl |= (1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_OSC0RDY_OFFSET + Channel))));
return true;
}
static inline void AVR32CLK_StopExternalOscillator(const uint8_t Channel)
{
AVR32_PM.mcctrl &= ~(1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
}
static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency)
{
switch (Source)
/* Public Interface - May be used in end-application: */
/* Macros: */
/** Enum for the possible external oscillator types. */
enum Extern_OSC_ClockTypes_t
{
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;
}
EXOSC_MODE_CLOCK = 0, /**< External clock (non-crystal) mode. */
EXOSC_MODE_900KHZ_MAX = 1, /**< External crystal oscillator equal to or slower than 900KHz. */
EXOSC_MODE_3MHZ_MAX = 2, /**< External crystal oscillator equal to or slower than 3MHz. */
EXOSC_MODE_8MHZ_MAX = 3, /**< External crystal oscillator equal to or slower than 8MHz. */
EXOSC_MODE_8MHZ_OR_MORE = 4, /**< External crystal oscillator equal to or faster than 8MHz. */
};
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;
}
static inline void AVR32CLK_StopPLL(const uint8_t Channel)
{
AVR32_PM.PLL[Channel].pllen = false;
}
static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency)
{
switch (Source)
/** Enum for the possible external oscillator statup times. */
enum Extern_OSC_ClockStartup_t
{
case CLOCK_SRC_OSC0:
AVR32_PM.GCCTRL[Channel].pllsel = 0;
AVR32_PM.GCCTRL[Channel].oscsel = 0;
break;
case CLOCK_SRC_OSC1:
AVR32_PM.GCCTRL[Channel].pllsel = 0;
AVR32_PM.GCCTRL[Channel].oscsel = 1;
break;
case CLOCK_SRC_PLL0:
AVR32_PM.GCCTRL[Channel].pllsel = 1;
AVR32_PM.GCCTRL[Channel].oscsel = 0;
break;
case CLOCK_SRC_PLL1:
AVR32_PM.GCCTRL[Channel].pllsel = 1;
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;
EXOSC_START_0CLK = 0, /**< Immediate startup, no delay. */
EXOSC_START_64CLK = 1, /**< Wait 64 clock cyles before startup for stability. */
EXOSC_START_128CLK = 2, /**< Wait 128 clock cyles before startup for stability. */
EXOSC_START_2048CLK = 3, /**< Wait 2048 clock cyles before startup for stability. */
EXOSC_START_4096CLK = 4, /**< Wait 4096 clock cyles before startup for stability. */
EXOSC_START_8192CLK = 5, /**< Wait 8192 clock cyles before startup for stability. */
EXOSC_START_16384CLK = 6, /**< Wait 16384 clock cyles before startup for stability. */
};
return true;
}
static inline void AVR32CLK_StopGenericClock(const uint8_t Channel)
{
AVR32_PM.GCCTRL[Channel].cen = false;
}
static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
const uint32_t SourceFreq)
{
AVR32_FLASHC.FCR.fws = (SourceFreq > 30000000) ? true : false;
switch (Source)
/** Enum for the possible module clock sources. */
enum System_ClockSource_t
{
case CLOCK_SRC_SLOW_CLK:
AVR32_PM.MCCTRL.mcsel = 0;
break;
case CLOCK_SRC_OSC0:
AVR32_PM.MCCTRL.mcsel = 1;
break;
case CLOCK_SRC_PLL0:
AVR32_PM.MCCTRL.mcsel = 2;
break;
default:
return false;
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 Extern_OSC_ClockTypes_t.
* \param[in] Startup Statup time of the external oscillator, a value from \ref Extern_OSC_ClockStartup_t.
*
* \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified.
*/
static inline void AVR32CLK_StartExternalOscillator(const uint8_t Channel,
const uint8_t Type,
const uint8_t Startup) ATTR_ALWAYS_INLINE;
static inline void AVR32CLK_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 AVR32CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE;
static inline void AVR32CLK_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.
*
* \param[in] Channel Index of the PLL to start.
* \param[in] Source Clock source for the PLL, a value from \ref 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 Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency) ATTR_ALWAYS_INLINE;
static inline bool AVR32CLK_StartPLL(const uint8_t Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency)
{
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 AVR32CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE;
static inline void AVR32CLK_StopPLL(const uint8_t Channel)
{
AVR32_PM.PLL[Channel].pllen = false;
}
return true;
}
/** 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 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 AVR32CLK_StartGenericClock(const uint8_t Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency) ATTR_ALWAYS_INLINE;
static inline bool AVR32CLK_StartGenericClock(const uint8_t Channel,
const uint8_t Source,
const uint32_t SourceFreq,
const uint32_t Frequency)
{
switch (Source)
{
case CLOCK_SRC_OSC0:
AVR32_PM.GCCTRL[Channel].pllsel = 0;
AVR32_PM.GCCTRL[Channel].oscsel = 0;
break;
case CLOCK_SRC_OSC1:
AVR32_PM.GCCTRL[Channel].pllsel = 0;
AVR32_PM.GCCTRL[Channel].oscsel = 1;
break;
case CLOCK_SRC_PLL0:
AVR32_PM.GCCTRL[Channel].pllsel = 1;
AVR32_PM.GCCTRL[Channel].oscsel = 0;
break;
case CLOCK_SRC_PLL1:
AVR32_PM.GCCTRL[Channel].pllsel = 1;
AVR32_PM.GCCTRL[Channel].oscsel = 1;
break;
default:
return false;
}
if (SourceFreq < Frequency)
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.
*/
static inline void AVR32CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE;
static inline void AVR32CLK_StopGenericClock(const uint8_t Channel)
{
AVR32_PM.GCCTRL[Channel].cen = false;
}
/** 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 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 AVR32CLK_SetCPUClockSource(const uint8_t Source,
const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
static inline bool AVR32CLK_SetCPUClockSource(const uint8_t Source,
const uint32_t SourceFreq)
{
AVR32_FLASHC.FCR.fws = (SourceFreq > 30000000) ? true : false;
switch (Source)
{
case CLOCK_SRC_SLOW_CLK:
AVR32_PM.MCCTRL.mcsel = 0;
break;
case CLOCK_SRC_OSC0:
AVR32_PM.MCCTRL.mcsel = 1;
break;
case CLOCK_SRC_PLL0:
AVR32_PM.MCCTRL.mcsel = 2;
break;
default:
return false;
}
return true;
}
/* Disable C linkage for C++ Compilers: */
#if defined(__cplusplus)
}
#endif
#endif
/** @} */