/**
  ******************************************************************************
  * @file    stm32f4xx_it.c
  * @brief   Interrupt Service Routines.
  ******************************************************************************
  *
  * COPYRIGHT(c) 2015 STMicroelectronics
  *
  * 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 of STMicroelectronics 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 HOLDER 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.
  *
  ******************************************************************************
  *
  * Modifications by Robert Fisk
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
#include "stm32f4xx.h"
#include "interrupts.h"
#include "led.h"
#include "board_config.h"


/* External variables --------------------------------------------------------*/
extern HCD_HandleTypeDef hhcd_USB_OTG_FS;
extern DMA_HandleTypeDef hdma_spi1_rx;
extern DMA_HandleTypeDef hdma_spi1_tx;

extern volatile uint8_t UsbInterruptHasHappened;

uint8_t BusFaultAllowed = 0;


/******************************************************************************/
/*            Cortex-M4 Processor Interruption and Exception Handlers         */ 
/******************************************************************************/

/**
* @brief This function handles System tick timer.
*/
void SysTick_Handler(void)
{
  HAL_IncTick();
  LED_Tick();
}

/******************************************************************************/
/* STM32F4xx Peripheral Interrupt Handlers                                    */
/* Add here the Interrupt Handlers for the used peripherals.                  */
/* For the available peripheral interrupt handler names,                      */
/* please refer to the startup file (startup_stm32f4xx.s).                    */
/******************************************************************************/



void DMA2_Stream2_IRQHandler(void)
{
  HAL_DMA_IRQHandler(&hdma_spi1_rx);
}

void DMA2_Stream3_IRQHandler(void)
{
  HAL_DMA_IRQHandler(&hdma_spi1_tx);
}

void OTG_FS_IRQHandler(void)
{
    HAL_HCD_IRQHandler(&hhcd_USB_OTG_FS);
    UsbInterruptHasHappened = 1;
}


//This weird stuff is required when disabling flash writes.
//The deliberate flash lockout will cause a bus fault that we need to process.
void EnableOneBusFault(void)
{
    //It should not be enabled already!
    if (BusFaultAllowed)
    {
        while (1);
    }
    SCB->SHCSR = SCB_SHCSR_BUSFAULTENA_Msk;
    BusFaultAllowed = 1;
}

void BusFault_Handler(void)
{
    if (BusFaultAllowed)
    {
        BusFaultAllowed = 0;
        return;
    }
    while (1);
}


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