Dev GunwooYun

board : STM32F103RB + I/O board
clock : 64MHz
Prescaler : 6400-1
ARR : 10000-1

PC0:7 OUTPUT LED
Timer2: Internal Clock, no channel

Timer interrupt 발생 시, callback 함수 toggle

// Timer callback function, toggle led
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim);

// Timer base interrupt mode start
if((HAL_TIM_Base_Start_IT(&htim2) != HAL_OK)){
	Error_Handler();
    }

/*********************************************************/

/* USER CODE BEGIN 4 */
// Timer callback function, toggle led
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
	HAL_GPIO_TogglePin(GPIOC, 0x00ff);
}
/* USER CODE END 4 */

사용보드 : STM32F103RB + I/O board

interrupt callback 함수를 이용한 LED 출력

pc0:7 led output

pa8 switch1

pb4 switch2

sw1 을 누르면 led1->led8 순차적으로 high

sw2 을 누르면 반대로 high

flag 변수를 하나 만들고 interrupt callback 함수에서 플래그 변수를 바꾼다.

while에서 플래그에 따라 동작을 수행한다.

  while (1)
  {
	  /*Push PA8 (sw1) Button*/
	  if(flag_SW1 == 1){
		  HAL_GPIO_WritePin(GPIOC, led, 1);
		  HAL_Delay(200);
		  HAL_GPIO_WritePin(GPIOC, led, 0);
		  led <<= 1;
		  if(led > 0x0100) led = 0x0001;

	  }
	  /*Push PB4 (sw2) Button*/
	  if(flag_SW1 == 2){
		  HAL_GPIO_WritePin(GPIOC, led, 1);
		  HAL_Delay(200);
		  HAL_GPIO_WritePin(GPIOC, led, 0);
		  led >>= 1;
		  if(led < 0x0001) led = 0x0080;
	  	  }
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  
/*********************************************/

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	if(GPIO_Pin == GPIO_PIN_8) //PA8
		flag_SW1 = 1;
	if(GPIO_Pin == GPIO_PIN_4) // PB4
		flag_SW1 = 2;
}

사용보드 : STM32F103RB + I/O board

GPIO 입력 및 출력 : 스위치를 누르면 해당 LED ON, 1초 딜레이 후 OFF

PC0:7 OUTPUT LED
PA8 SWITCH 1
PB4 SWITCH 2
PB5 SWITCH 5
PB10 SWITCH 10

SW1 누르면 PC0:1 HIGH
SW2 누르면 PC2:3 HIGH
SW3 누르면 PC4:5 HIGH
SW4 누르면 PC6:7 HIGH

스위치가 pull-up 방식이므로 기본값은 high이다. 조건문에서 부정조건을 넣지 않으면 첫번째 단에서 계속 걸리게 되므로 부정문을 넣어 LOW일때 작동하도록 한다.

while (1)
  {
	  // switch default pull-up, value is 1
	  if(!HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_8))
		  HAL_GPIO_WritePin(GPIOC, 0x0001 | 0x0002, GPIO_PIN_SET); // PC0, PC1 HIGH
	  else if(!HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4))
	  		  HAL_GPIO_WritePin(GPIOC, 0x0004 | 0x0008, GPIO_PIN_SET); // PC2, PC3 HIGH
	  else if(!HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5))
	  		  HAL_GPIO_WritePin(GPIOC, 0x0010 | 0x0020, GPIO_PIN_SET); // PC4, PC5 HIGH
	  else if(!HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_10))
	  	  		  HAL_GPIO_WritePin(GPIOC, 0x0040 | 0x0080, GPIO_PIN_SET); // PC6, PC7 HIGH
	  HAL_Delay(1000); // delay 1 sec
	  HAL_GPIO_WritePin(GPIOC, 0x00FF, GPIO_PIN_RESET); // PC0:7 LOW
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }