ARM Cortex

代码说明：

ARM cortex-M3系列处理器的代码，包括正交编码器接口QEI、中断控制Interrupt、硬件类型定义hw_types。（IAR环境工程）-ARM cortex-M3 family of processors code, including quadrature encoder interface, QEI, interrupt control Interrupt, the hardware type definition hw_types. (IAR Environmental Engineering)