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28335-epwm启动adc采样，在一个pwm周期内中断触发ad之后，那么软件触发之后在这个pwm周期结束前ad是采样一次还是在周期结束前一直采样（epwm设置增计数模式），谢谢！！！
每次触发都采样一次，不会一直采样到周期结束。
一次触发只采样一次，采样值为采样中断时刻的实时值
