gistfile1.txt

void keys_init()
{
    // config gpio
	stm32f4_gpio_set_config(&io_key1);  // PA12
	stm32f4_gpio_set_config(&io_key2);
    stm32f4_gpio_set_config(&io_key3);
	stm32f4_gpio_set_config(&io_key4);
	
    
    //  SYSCFGEN and exit map
	(*(uint32_t*)0x40023844) |= 1<<14;
    
    SYSCFG_EXTICR3 = 0;
    SYSCFG_EXTICR4 = 0;
    
	
	
    // EXIT INIT
	EXTI_IMR |= (1<<12);
	EXTI_RTSR |= (1<<12);

    EXTI_IMR |= (1<<11);
	EXTI_RTSR |= (1<<11);

    EXTI_IMR |= (1<<10);
	EXTI_RTSR |= (1<<10);

    EXTI_IMR |= (1<<9);
	EXTI_RTSR |= (1<<9);


    //NVIC_Init
    //NVIC it group2
	
	SCB_AIRCR = 0x05FA0000 | 0x500;
	// ip Interrupt priority register x
	
	//(*(volatile uint8_t*)0xE000E417) = 0xe0;  //23
    //(*(volatile uint8_t*)0xE000E428) = 0xe0;  // 40
    (*(volatile uint8_t*)0xE000E417) = 0x50;  //23
    (*(volatile uint8_t*)0xE000E428) = 0x50;  // 40
    printf("nip 5 %08x\n", (*(volatile uint32_t*)0xE000E414));
	
	
	
	// 23 40 Interrupt set-enable register x (NVIC_ISERx)
    // nvic enable interrupter number
    // 0xE000E100
    (*(volatile uint32_t*)0xE000E100) |= (1<<23);
    (*(volatile uint32_t *)0xE000E104) |= (1<< (40%32));
}