/**
  ******************************************************************************
  * @file    Project/STM32F4xx_StdPeriph_Templates/stm32f4xx_it.c
  * @author  MCD Application Team
  * @version V1.6.1
  * @date    21-October-2015
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"
/** @addtogroup Template_Project
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/******************************************************************************/
/*            Cortex-M4 Processor Exceptions Handlers                         */
/******************************************************************************/

/**
  * @brief  This function handles NMI exception.
  * @param  None
  * @retval None
  */
void NMI_Handler(void)
{
}

#pragma GCC diagnostic ignored "-Wunused-but-set-variable"

/**
 * @see http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html
 */
void prvGetRegistersFromStack(uint32_t *pulFaultStackAddress)
{
	/* These are volatile to try and prevent the compiler/linker optimising them
	away as the variables never actually get used. If the debugger won't show the
	values of the variables, make them global my moving their declaration outside
	of this function. */
	volatile uint32_t r0;
	volatile uint32_t r1;
	volatile uint32_t r2;
	volatile uint32_t r3;
	volatile uint32_t r12;
	volatile uint32_t lr; /* Link register. */
	volatile uint32_t pc; /* Program counter. */
	volatile uint32_t psr;/* Program status register. */

	r0 = pulFaultStackAddress[0];
	r1 = pulFaultStackAddress[1];
	r2 = pulFaultStackAddress[2];
	r3 = pulFaultStackAddress[3];

	r12 = pulFaultStackAddress[4];
	lr = pulFaultStackAddress[5];
	pc = pulFaultStackAddress[6];
	psr = pulFaultStackAddress[7];

	/* Trigger break point here, so that the debugger stops at this line. */
	__ASM volatile("BKPT #02");
}

#pragma GCC diagnostic pop

void HardFault_Handler(void)
{
	__asm volatile (
	    " tst lr, #4                                                \n"
	    " ite eq                                                    \n"
	    " mrseq r0, msp                                             \n"
	    " mrsne r0, psp                                             \n"
	    " ldr r1, [r0, #24]                                         \n"
	    " ldr r2, handler2_address_const                            \n"
	    " bx r2                                                     \n"
	    " handler2_address_const: .word prvGetRegistersFromStack    \n"
	);
}

/**
  * @brief  This function handles Memory Manage exception.
  * @param  None
  * @retval None
  */
void MemManage_Handler(void)
{
	/* Go to infinite loop when Memory Manage exception occurs */
	while (1) {
	}
}

/**
  * @brief  This function handles Bus Fault exception.
  * @param  None
  * @retval None
  */
void BusFault_Handler(void)
{
	/* Go to infinite loop when Bus Fault exception occurs */
	while (1) {
	}
}

/**
  * @brief  This function handles Usage Fault exception.
  * @param  None
  * @retval None
  */
void UsageFault_Handler(void)
{
	/* Go to infinite loop when Usage Fault exception occurs */
	while (1) {
	}
}

/**
  * @brief  This function handles Debug Monitor exception.
  * @param  None
  * @retval None
  */
void DebugMon_Handler(void)
{
}

/******************************************************************************/
/*                 STM32F4xx Peripherals Interrupt Handlers                   */
/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
/*  available peripheral interrupt handler's name please refer to the startup */
/*  file (startup_stm32f4xx.s).                                               */
/******************************************************************************/

/**
  * @brief  This function handles PPP interrupt request.
  * @param  None
  * @retval None
  */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
