| /* ---------------------------------------------------------------------------- | |
| * SAM Software Package License | |
| * ---------------------------------------------------------------------------- | |
| * Copyright (c) 2012, Atmel Corporation | |
| * | |
| * All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions are met: | |
| * | |
| * - Redistributions of source code must retain the above copyright notice, | |
| * this list of conditions and the disclaimer below. | |
| * | |
| * Atmel's name may not be used to endorse or promote products derived from | |
| * this software without specific prior written permission. | |
| * | |
| * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR | |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
| * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, | |
| * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
| * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| * ---------------------------------------------------------------------------- | |
| */ | |
| /*---------------------------------------------------------------------------- | |
| * Headers | |
| *----------------------------------------------------------------------------*/ | |
| #include "chip.h" | |
| #include <assert.h> | |
| /*---------------------------------------------------------------------------- | |
| * Local definitions | |
| *----------------------------------------------------------------------------*/ | |
| /*---------------------------------------------------------------------------- | |
| * Local variables | |
| *----------------------------------------------------------------------------*/ | |
| /*---------------------------------------------------------------------------- | |
| * Local functions | |
| *----------------------------------------------------------------------------*/ | |
| /** | |
| * \brief Select external 32K Crystal. | |
| * | |
| * \note | |
| * There's no option to return to internal slow RC after switching to ext 32kHz crystal. | |
| */ | |
| extern void SUPC_SelectExtCrystal32K(void) | |
| { | |
| PMC_EnableXT32KFME(); | |
| /* Select XTAL 32k instead of internal slow RC 32k for slow clock */ | |
| if ( (SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST ) | |
| { | |
| SUPC->SUPC_CR = SUPC_CR_KEY_PASSWD | SUPC_CR_XTALSEL_CRYSTAL_SEL; | |
| while( !(SUPC->SUPC_SR & SUPC_SR_OSCSEL) ); | |
| } | |
| } | |