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定时器中断就是普通的硬件中断，一个器件会有很上百个硬件中断，HWI是中断矢量，一个器件每个核内部只有12个可灵活映射的HWI。sysBios对timer 外设进行了抽象，产生的中断会映射到某一个hwi。
只需将相应的event number(手册p167页可查询)映射到interrupt number(CPUINT4-CPUINT15)就可以了.建议您看一下以下的traning视频.
training.ti.com/ti-rtos-workshop-series-5-10-using-hwi
