wiringPi其实和BCM2835 library类似,也是通过memmap, IOmap来实现在用户空间直接操作底层寄存器 wiringPi http://wiringpi.com/ WiringPi is a PIN based GPIO access library written in C for the BCM2835, BCM2836 and BCM2837 SoC devices used in all Raspberry Pi. versions. 在之前编译的系统中wirin