externe Interrupts

//----------------------------------------------------------------------
// Titel     : einfaches Beispiel für die INT-Programmierung des STM32F4
//----------------------------------------------------------------------
// Funktion  : der blaue UserButton schaltet die rote LED per extINT um
// Schaltung : UserButton an PA0, Blaue LED PD15
//----------------------------------------------------------------------
// Hardware  : STM32F4 Discovery
// MCU       : STM32F407VGT6
// Takt      : 168 MHz
// Sprache   : ARM C
// Datum     : 21.01.2013
// Version   : 1
// Autor     : Alexander Huwaldt
//----------------------------------------------------------------------
#include <stddef.h>
#include <stdlib.h>
#include "hardware.h"
 
#define BUTTON_USER (1<<0)
#define LED_BLUE 	(1<<15)
GPIO_InitTypeDef 	GPIO_InitStructure;
EXTI_InitTypeDef   	EXTI_InitStructure;
NVIC_InitTypeDef   	NVIC_InitStructure;
volatile bool mustToggle;
 
void initApplication()
{
	SysTick_Config(SystemCoreClock/100);
	// weitere Initialisierungen durchführen
 
	mustToggle=false;
 
	/* Enable the BUTTON Clock */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
	/* Configure Button pin as input */
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_InitStructure.GPIO_Pin = BUTTON_USER;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
 
	/* Enable SYSCFG clock */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
 
	/* Connect EXTI0 Line to PA0 pin */
	SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
	EXTI_InitStructure.EXTI_Line = EXTI_Line0;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);
 
	/* Enable and set Button EXTI Interrupt to the lowest priority */
	NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure); 
 
	/* Enable the LED Clock */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
 
	/* Configure red LED in output pushpull mode */
	GPIO_StructInit(&GPIO_InitStructure);	
	GPIO_InitStructure.GPIO_Pin = LED_BLUE;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOD, &GPIO_InitStructure);	
 
}
int main(void)
{
	SystemInit();
	initApplication();
	do
	{
 
		if (mustToggle)
		{
			GPIO_SetBits(GPIOD,LED_BLUE);
			waitMs(100);
			GPIO_ResetBits(GPIOD,LED_BLUE);
			waitMs(100);
		}
		else
			GPIO_ResetBits(GPIOD,LED_BLUE);
 
	}
	while (true);
	return 0;
}
 
extern "C" void SysTick_Handler(void)
{
	// Application SysTick
}
 
extern "C" void EXTI0_IRQHandler()
{
	if (mustToggle)
		mustToggle=false;
	else
		mustToggle=true;
 
	EXTI_ClearITPendingBit(EXTI_Line0);
}

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