实验的结果(查看中断是否产生)
/teset/irq # cat /proc/interrupts
CPU0
1: 3295 AIC at91_tick, atmel_serial
10: 0 AIC at91_udc
20: 0 AIC ohci_hcd:usb1
21: 1801 AIC eth0
37: 1 GPIO kirq
101: 1 GPIO at91_udc
Err: 0四 其他设备的调用就直接用request_irq(IRQ_NUMBER,…)
