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標題: GPIO控制led程序 [打印本頁]

作者: liuqq 時間: 2015-5-21 22:40
標題: GPIO控制led程序

const GPIO_PIN_ID Pin_LED[] = {
  { GPIOD, 12 },
  { GPIOD, 13 },
  { GPIOD, 14 },
  { GPIOD, 15 }
};

#define NUM_LEDS (sizeof(Pin_LED)/sizeof(GPIO_PIN_ID))

/*-----------------------------------------------------------------------------
*    LED_Initialize:  Initialize LEDs
*
* Parameters: (none)
* Return:    (none)
*----------------------------------------------------------------------------*/
void LED_Initialize (void) {
  uint32_t n;

  /* Configure pins: Push-pull Output Mode (50 MHz) with Pull-down resistors */
  for (n = 0; n < NUM_LEDS; n++) {
GPIO_PortClock (Pin_LED[n].port, true);
GPIO_PinWrite (Pin_LED[n].port, Pin_LED[n].num, 0);
GPIO_PinConfigure(Pin_LED[n].port, Pin_LED[n].num,
                  GPIO_MODE_OUTPUT,
                  GPIO_OUTPUT_PUSH_PULL,
                  GPIO_OUTPUT_SPEED_50MHz,
                  GPIO_PULL_DOWN);
  }
}

/*-----------------------------------------------------------------------------
*    LED_Uninitialize:  Uninitialize LEDs
*
* Parameters: (none)
* Return:    (none)
*----------------------------------------------------------------------------*/
void LED_Uninitialize (void) {
  uint32_t n;

  /* Configure pins: Input mode, without Pull-up/down resistors */
  for (n = 0; n < NUM_LEDS; n++) {
GPIO_PinConfigure(Pin_LED[n].port, Pin_LED[n].num,
                  GPIO_MODE_INPUT,
                  GPIO_OUTPUT_PUSH_PULL,
                  GPIO_OUTPUT_SPEED_2MHz,
                  GPIO_NO_PULL_UP_DOWN);
  }
}

/*-----------------------------------------------------------------------------
*    LED_On: Turns on requested LED
*
* Parameters:  num - LED number
* Return:    (none)
*----------------------------------------------------------------------------*/
void LED_On (uint32_t num) {
  GPIO_PinWrite(Pin_LED[num].port, Pin_LED[num].num, 1);
}

/*-----------------------------------------------------------------------------
*    LED_Off: Turns off requested LED
*
* Parameters:  num - LED number
* Return:    (none)
*----------------------------------------------------------------------------*/
void LED_Off (uint32_t num) {
  GPIO_PinWrite(Pin_LED[num].port, Pin_LED[num].num, 0);
}

/*-----------------------------------------------------------------------------
*    LED_Out: Write value to LEDs
*
* Parameters:  val - value to be displayed on LEDs
* Return:    (none)
*----------------------------------------------------------------------------*/
void LED_Out (uint32_t val) {
  uint32_t n;

  for (n = 0; n < NUM_LEDS; n++) {
if (val & (1<<n)) {
   LED_On (n);
} else {
   LED_Off(n);
}
  }
}

/*-----------------------------------------------------------------------------
*    LED_Num: Get number of available LEDs
*
* Parameters: (none)
* Return:    number of available LEDs
*----------------------------------------------------------------------------*/
uint32_t LED_Num (void) {
  return (NUM_LEDS);
}

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