FAP I/O board STM32 interrupt snippet

FAP_interrupt.c

void interrupt_activate(uint8_t vector)
{
  // put the interrupt vector on STM32-CPLD bus
  CPLD_DATA_PORT->ODR &= 0xff00;
  CPLD_DATA_PORT->ODR |= vector;
  // load the interrupt vector latch inside CPLD
  data_output();
  vect_load_activate();
  vect_load_deactivate();
  data_input();
  // start the Z80 interrupt
  HAL_GPIO_WritePin(Z80_INT_GPIO_Port, Z80_INT_Pin, GPIO_PIN_RESET);
}

// ...meanwhile in STM32 pin change ISR
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  // INTACK interrupt
  if(GPIO_Pin == INTACK_Pin)
    HAL_GPIO_WritePin(Z80_INT_GPIO_Port, Z80_INT_Pin, GPIO_PIN_SET); // turn off Z80 interrupt
}