.syntax unified
.global initIRQ
//Taste an PC13
initIRQ:
	ldr	r1,=0x40010400	//EXTI Base Address
	//EXTI13 config
	mov.w	r2,#0x2000
	str	r2,[r1,#0x00]	//maskregister
	str r2,[r1,#0x0c]	//falling edge register
	str r2,[r1,#0x14]	//clear pending register (EXTI_PR)
	ldr r1,=0x40023800	//rcc base address
	ldr r2,[r1,#0x20]	//APB2 peripheral clock enable register
	add r2,#0x00000001	//SYSCFGEN: System configuration controller clock enable
	str r2,[r1,#0x20]

	ldr r1,=0x40010000	//SysCFG Base Address
	mov.w r2,#0x0020	//PCx - Pin als Interruptquelle
	strh r2,[r1,#0x14]	//SYSCFG external interrupt configuration register 4
	//NVIC config
	bx lr


