* Usage Example:
* \code
* #include <LUFA/Platform/XMEGA/ClockManagement.h>
- *
+ *
* void main(void)
* {
* // Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it
* XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, 32000000);
* XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL, F_CPU);
- *
+ *
* // Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference
* XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
* XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, 48000000);
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. */
+ EXOSC_FREQ_16MHZ_MAX = OSC_FRQRANGE_12TO16_gc, /**< External crystal oscillator equal to or slower than 16MHz. */
};
/** Enum for the possible external oscillator statup times. */
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
{
{
OSC.XOSCCTRL = (FreqRange | ((Startup == EXOSC_START_32KCLK) ? OSC_X32KLPM_bm : 0) | Startup);
OSC.CTRL |= OSC_XOSCEN_bm;
-
- while (!(OSC.STATUS & OSC_XOSCRDY_bm));
+
+ while (!(OSC.STATUS & OSC_XOSCRDY_bm));
return true;
}
return true;
case CLOCK_SRC_INT_RC32MHZ:
OSC.CTRL |= OSC_RC32MEN_bm;
- while (!(OSC.STATUS & OSC_RC32MRDY_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));
+ while (!(OSC.STATUS & OSC_RC32KRDY_bm));
return true;
}
-
+
return false;
}
* \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)
{
OSC.CTRL &= ~OSC_RC32KEN_bm;
return true;
}
-
+
return false;
}
const uint32_t Frequency)
{
uint8_t MulFactor = (Frequency / SourceFreq);
-
+
if (SourceFreq > Frequency)
- return false;
-
+ return false;
+
switch (Source)
{
case CLOCK_SRC_INT_RC2MHZ:
}
OSC.CTRL |= OSC_PLLEN_bm;
-
+
while (!(OSC.STATUS & OSC_PLLRDY_bm));
return true;
}
{
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.
const uint32_t Frequency)
{
uint16_t DFLLCompare = (Frequency / 1000);
-
+
switch (Source)
{
case CLOCK_SRC_INT_RC2MHZ:
default:
return false;
}
-
+
return true;
}
default:
return false;
}
-
+
return true;
}
const uint32_t SourceFreq)
{
uint8_t ClockSourceMask = 0;
-
+
switch (Source)
{
case CLOCK_SRC_INT_RC2MHZ:
default:
return false;
}
-
+
uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
GlobalInterruptDisable();
CCP = CCP_IOREG_gc;
CLK_CTRL = ClockSourceMask;
-
+
SetGlobalInterruptMask(CurrentGlobalInt);
-
- Delay_MS(1);
+
+ Delay_MS(1);
return (CLK.CTRL == ClockSourceMask);
}
#endif
/** @} */
+
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