diff options
Diffstat (limited to 'nuttx/arch/arm/src/armv7-m/up_systemreset.c')
-rw-r--r-- | nuttx/arch/arm/src/armv7-m/up_systemreset.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/armv7-m/up_systemreset.c b/nuttx/arch/arm/src/armv7-m/up_systemreset.c new file mode 100644 index 000000000..0d7bd2736 --- /dev/null +++ b/nuttx/arch/arm/src/armv7-m/up_systemreset.c @@ -0,0 +1,79 @@ +/**************************************************************************** + * arch/arm/src/armv7-m/up_systemreset.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * Darcy Gong + * + * 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. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> + +#include "up_arch.h" +#include "nvic.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + + /**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public functions + ****************************************************************************/ + +void up_systemreset(void) +{ + uint32_t regval; + + /* Set up for the system reset, retaining the priority group from the + * the AIRCR register. + */ + + regval = getreg32(NVIC_AIRCR) & NVIC_AIRCR_PRIGROUP_MASK; + regval |= ((0x5fa << NVIC_AIRCR_VECTKEY_SHIFT) | NVIC_AIRCR_SYSRESETREQ); + putreg32(regval, NVIC_AIRCR); + + /* Ensure completion of memory accesses */ + + __asm volatile ("dsb"); + + /* Wait for the reset */ + + for (;;); +} |