以外部中斷0，管腳為pa0為例來進行配置
void sys_exti0init(void)
在startup_stm32l1xx_mdp.s 檔案中，中斷函式名如下定義：
; external interrupts
dcd wwdg_irqhandler ; window watchdog
dcd pvd_irqhandler ; pvd through exti line detect
dcd tamper_stamp_irqhandler ; tamper and time stamp
dcd rtc_wkup_irqhandler ; rtc wakeup
dcd flash_irqhandler ; flash
dcd rcc_irqhandler ; rcc
dcd exti0_irqhandler ; exti line
0 dcd exti1_irqhandler ; exti line
1 dcd exti2_irqhandler ; exti line
2 dcd exti3_irqhandler ; exti line
3 dcd exti4_irqhandler ; exti line
4 dcd dma1_channel1_irqhandler ; dma1 channel 1
dcd dma1_channel2_irqhandler ; dma1 channel 2
dcd dma1_channel3_irqhandler ; dma1 channel 3
dcd dma1_channel4_irqhandler ; dma1 channel 4
dcd dma1_channel5_irqhandler ; dma1 channel 5
dcd dma1_channel6_irqhandler ; dma1 channel 6
dcd dma1_channel7_irqhandler ; dma1 channel 7
dcd adc1_irqhandler ; adc1
dcd usb_hp_irqhandler ; usb high priority
dcd usb_lp_irqhandler ; usb low priority
dcd dac_irqhandler ; dac
dcd comp_irqhandler ; comp through exti line
dcd exti9_5_irqhandler ; exti line
9..5
dcd lcd_irqhandler ; lcd
dcd tim9_irqhandler ; tim9
dcd tim10_irqhandler ; tim10
dcd tim11_irqhandler ; tim11
dcd tim2_irqhandler ; tim2
dcd tim3_irqhandler ; tim3
dcd tim4_irqhandler ; tim4
dcd i2c1_ev_irqhandler ; i2c1 event
dcd i2c1_er_irqhandler ; i2c1 error
dcd i2c2_ev_irqhandler ; i2c2 event
dcd i2c2_er_irqhandler ; i2c2 error
dcd spi1_irqhandler ; spi1
dcd spi2_irqhandler ; spi2
dcd usart1_irqhandler ; usart1
dcd usart2_irqhandler ; usart2
dcd usart3_irqhandler ; usart3
dcd exti15_10_irqhandler ; exti line
15..10
dcd rtc_alarm_irqhandler ; rtc alarm through exti line
dcd usb_fs_wkup_irqhandler ; usb fs wakeup from suspend
dcd tim6_irqhandler ; tim6
dcd tim7_irqhandler ; tim7
dcd 0 ; reserved
dcd tim5_irqhandler ; tim5
dcd spi3_irqhandler ; spi3
dcd 0 ; reserved
dcd 0 ; reserved
dcd dma2_channel1_irqhandler ; dma2 channel 1
dcd dma2_channel2_irqhandler ; dma2 channel 2
dcd dma2_channel3_irqhandler ; dma2 channel 3
dcd dma2_channel4_irqhandler ; dma2 channel 4
dcd dma2_channel5_irqhandler ; dma2 channel 5
dcd aes_irqhandler ; aes
dcd comp_acq_irqhandler ; comparator channel acquisition
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