Posted on September 23, 2017 at 16:27
When is the ISPR register used?
ISPR [0] | = 0x00000001 << 6;
// (EXTI0 Position)
Does this code convert the EXTI0 interrupt into the pending state so that the EXTI0 interrupt should not be executed?
But the interrupts work well
Did I misunderstand?
This is my sorce code
int main(void)
{/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit *//* Initialize all configured peripherals */
/* USER CODE BEGIN 2 */
//NVIC Register init NVIC->ISER[0] |= 0x01<<6; //EXTI0 vect enable //SYSCFG Register init SYSCFG->EXTICR[0] |=0x00000000; //PA0 interrupt enable //RCC Register init __IO uint32_t tmpreg = 0x00U; //__IO = volatile RCC->AHB1ENR |= 0x00000041; //GPIOG, GPIOA AHB1ENR //RCC->APB2ENR |= 0x00000001 << 14; //SYSCFG ENABLE: APB2 clock is EXTI /* Delay after an RCC peripheral clock enabling */ tmpreg = 1; // UNUSED(tmpreg); // //GPIO Register init GPIOA->PUPDR |= 0x00000002; //GPIOA_PIN0 PULL DOWN SET GPIOG->MODER |= 0x04000000; //GPIOG_PIN_13 OUTPUT MODE GPIOG->OTYPER |= 0x00000000; //GPIOG PORT Push-Pull GPIOG->OSPEEDR |= 0x0C000000; //GPIOG_PIN_13 HIGH SPEED GPIOG->PUPDR |= 0x0000000; //no pullup no pulldown //EXTI Register init EXTI->IMR |= 0x00000001; //EXTI0 enable EXTI->RTSR |= 0x00000001;//EXTI0 rising edge enable NVIC->ISPR[0] = 0x00000001<<6; /* USER CODE END 2 *//* Infinite loop */
/* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE *//* USER CODE BEGIN 3 */
} /* USER CODE END 3 */}
