From 47f6a35013b2c6a370e5dce29aa6da3a96844695 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Sat, 14 Apr 2012 14:41:17 +0000 Subject: Reintegrate the FullEPAddresses development branch into trunk. --- LUFA/Platform/XMEGA/ClockManagement.h | 36 ++++++++++++++++++++++++++++------- 1 file changed, 29 insertions(+), 7 deletions(-) (limited to 'LUFA/Platform/XMEGA') diff --git a/LUFA/Platform/XMEGA/ClockManagement.h b/LUFA/Platform/XMEGA/ClockManagement.h index dcde7dcdb..9b3b56244 100644 --- a/LUFA/Platform/XMEGA/ClockManagement.h +++ b/LUFA/Platform/XMEGA/ClockManagement.h @@ -53,13 +53,13 @@ * * 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 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 48MHz using the USB SOF as a reference + * // 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 * @@ -117,6 +117,26 @@ }; /* 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. * @@ -219,6 +239,9 @@ if (SourceFreq > Frequency) return false; + + if (MulFactor > 31) + return false; switch (Source) { @@ -355,8 +378,7 @@ uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask(); GlobalInterruptDisable(); - CCP = CCP_IOREG_gc; - CLK_CTRL = ClockSourceMask; + XMEGACLK_CCP_Write(&CLK.CTRL, ClockSourceMask); SetGlobalInterruptMask(CurrentGlobalInt); -- cgit v1.2.3