/** | |
* \file | |
* | |
* \brief FPU support for SAM. | |
* | |
* Copyright (c) 2014-2015 Atmel Corporation. All rights reserved. | |
* | |
* \asf_license_start | |
* | |
* \page License | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* 1. Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the following disclaimer. | |
* | |
* 2. Redistributions in binary form must reproduce the above copyright notice, | |
* this list of conditions and the following disclaimer in the documentation | |
* and/or other materials provided with the distribution. | |
* | |
* 3. The name of Atmel may not be used to endorse or promote products derived | |
* from this software without specific prior written permission. | |
* | |
* 4. This software may only be redistributed and used in connection with an | |
* Atmel microcontroller product. | |
* | |
* 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 | |
* EXPRESSLY AND SPECIFICALLY 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. | |
* | |
* \asf_license_stop | |
* | |
*/ | |
/* | |
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> | |
*/ | |
#ifndef _FPU_H_INCLUDED_ | |
#define _FPU_H_INCLUDED_ | |
#include <compiler.h> | |
/** Address for ARM CPACR */ | |
#define ADDR_CPACR 0xE000ED88 | |
/** CPACR Register */ | |
#define REG_CPACR (*((volatile uint32_t *)ADDR_CPACR)) | |
/** | |
* \brief Enable FPU | |
*/ | |
__always_inline static void fpu_enable(void) | |
{ | |
irqflags_t flags; | |
flags = cpu_irq_save(); | |
REG_CPACR |= (0xFu << 20); | |
__DSB(); | |
__ISB(); | |
cpu_irq_restore(flags); | |
} | |
/** | |
* \brief Disable FPU | |
*/ | |
__always_inline static void fpu_disable(void) | |
{ | |
irqflags_t flags; | |
flags = cpu_irq_save(); | |
REG_CPACR &= ~(0xFu << 20); | |
__DSB(); | |
__ISB(); | |
cpu_irq_restore(flags); | |
} | |
/** | |
* \brief Check if FPU is enabled | |
* | |
* \return Return ture if FPU is enabled, otherwise return false. | |
*/ | |
__always_inline static bool fpu_is_enabled(void) | |
{ | |
return (REG_CPACR & (0xFu << 20)); | |
} | |
#endif /* _FPU_H_INCLUDED_ */ |