text: /**
    ******************************************************************************
    * @file    stm32f1xx_it.c
    * @brief   Interrupt Service Routines.
    ******************************************************************************
    *
    * COPYRIGHT(c) 2022 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.
    *
    ******************************************************************************
    */
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f1xx_hal.h"
  #include "stm32f1xx.h"
  #include "stm32f1xx_it.h"
  
  /* USER CODE BEGIN 0 */
  
  #include "protocols.h"
  
  /* USER CODE END 0 */
  
  /* External variables --------------------------------------------------------*/
  extern PCD_HandleTypeDef hpcd_USB_FS;
  
  /******************************************************************************/
  /*            Cortex-M3 Processor Interruption and Exception Handlers         */ 
  /******************************************************************************/
  
  /**
  * @brief This function handles System tick timer.
  */
  void SysTick_Handler(void)
  {
    /* USER CODE BEGIN SysTick_IRQn 0 */
  
    /* USER CODE END SysTick_IRQn 0 */
    HAL_IncTick();
    HAL_SYSTICK_IRQHandler();
    /* USER CODE BEGIN SysTick_IRQn 1 */
  
    uint32_t time = HAL_GetTick();
    GPIO_PinState led;
  
    if(lastSentReportTime + 1000 < time)
      // more than 1sec since we have sent data
      // blink led
      led = (time>>9)&1;
    else
      // we have valid data - keep lit
      led = GPIO_PIN_RESET;
  
    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, led);
  
    /* USER CODE END SysTick_IRQn 1 */
  }
  
  /******************************************************************************/
  /* STM32F1xx 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_stm32f1xx.s).                    */
  /******************************************************************************/
  
  /**
  * @brief This function handles USB low priority or CAN RX0 interrupts.
  */
  void USB_LP_CAN1_RX0_IRQHandler(void)
  {
    /* USER CODE BEGIN USB_LP_CAN1_RX0_IRQn 0 */
  
    /* USER CODE END USB_LP_CAN1_RX0_IRQn 0 */
    HAL_PCD_IRQHandler(&hpcd_USB_FS);
    /* USER CODE BEGIN USB_LP_CAN1_RX0_IRQn 1 */
  
    /* USER CODE END USB_LP_CAN1_RX0_IRQn 1 */
  }
  
  /* USER CODE BEGIN 1 */
  
  void EXTI9_5_IRQHandler() {
    static volatile uint32_t *out_bsrr = &DATA_OUT_GPIO_Port->BSRR;
    static uint32_t out_reset = DATA_OUT_Pin << 16U;
    static volatile uint32_t *in_idr = &DATA_IN_GPIO_Port->IDR;
  
    __HAL_GPIO_EXTI_CLEAR_IT(DATA_IN_Pin);
  
    if(!(*in_idr & DATA_IN_Pin) ^ uartInvert)
      // reset
      *out_bsrr |= out_reset;
    else
      // set
      *out_bsrr |= DATA_OUT_Pin;
  }
  
  
  
  /* USER CODE END 1 */
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  