stm32f4xx_it.c

/**
  ******************************************************************************
  * @file    Touch_Panel/stm32f4xx_it.c 
  * @author  MCD Application Team
  * @version V1.0.1
  * @date    11-November-2013
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and 
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2013 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_it.h"
#include "stdint.h"  
#include "stm32f4xx.h"
  
/** @addtogroup STM32F429I_DISCOVERY_Examples
  * @{
  */

/** @addtogroup Touch_Panel
  * @{
  */

/* 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)
{
}

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

/**
  * @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 SVCall exception.
  * @param  None
  * @retval None
  */
extern void syscall_handler(int, uint32_t psp);
 __attribute__ ((naked)) void SVC_Handler(void)
{
    __asm__(
      "mrs r0, psp\n"
      "ldr r1, [r0, #0x18]\n"
      "ldr r1, [r1, #-2]\n"
      "bic r1, #0xFFFFFF00\n"
      "stmdb r0!, {r4, r5, r6, r7, r8, r9, r10, r11, lr}\n"
      "str r1, [r0, #-4]\n"
      "pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}\n"
      "msr psr_nzcvq, ip\n"
      "bx lr\n"
    );
}

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

/**
  * @brief  This function handles PendSVC exception.
  * @param  None
  * @retval None
  */
 __attribute__ ((naked)) void PendSV_Handler(void)
{
    __asm__(
      "mrs r0, psp\n"
      "stmdb r0!, {r4, r5, r6, r7, r8, r9, r10, r11, lr}\n"
      "mov r1, #0\n"
      "str r1, [r0, #-4]\n"
      "pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}\n"
      "msr psr_nzcvq, ip\n"
      "bx lr\n"
    );
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
extern void OnSysTick(void);
 __attribute__ ((naked)) void SysTick_Handler(void)
{
  
    __asm__(
      "ldr r1, =ticks_counter\n"
      "ldr r0, [r1]\n"
      "add r0, #1\n"
      "str r0, [r1]\n"
    );
    __asm__(
      "cmp lr, #0xFFFFFFFD\n"
      "it ne\n"
      "bxne lr\n");
    // raise pendsv
    SCB->ICSR |= SCB_ICSR_PENDSVSET_Msk;
    __asm__(
      "bx lr\n"
    );
}

void _exit(int code)
{
	while(42);
}

/******************************************************************************/
/*                 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_stm32f429_439xx.s).  */
/******************************************************************************/

/**
  * @}
  */ 

/**
  * @}
  */ 


/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/