* 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
+ * // 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, 48000000);
+ * XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
* }
* \endcode
*
#define _XMEGA_CLOCK_MANAGEMENT_H_
/* Includes: */
- #include <LUFA/Common/Common.h>
+ #include "../../Common/Common.h"
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
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. */
+ /** 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). */
};
/* 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_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 Statup time of the external oscillator, a value from \ref XMEGA_Extern_OSC_ClockStartup_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.
*/
/** Starts the PLL of the XMEGA microcontroller, with the given options. This routine blocks until the PLL is ready for use.
*
- * \note The output frequency must be equal to or greater than the source frequency.
+ * \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.
if (SourceFreq > Frequency)
return false;
+
+ if (MulFactor > 31)
+ return false;
switch (Source)
{
/** 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] 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.
*
* \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 sucessfully altered, \c false if invalid parameters specified.
+ * \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)
uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
GlobalInterruptDisable();
- CCP = CCP_IOREG_gc;
- CLK_CTRL = ClockSourceMask;
+ XMEGACLK_CCP_Write(&CLK.CTRL, ClockSourceMask);
SetGlobalInterruptMask(CurrentGlobalInt);
projects / pub / USBasp.git / blobdiff