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请教28335的ADC触发源

各位:

        想请教一个问题,就是28335的ADC触发源可以设置为EPWM或者XINT2,现在是想在程序运行过程中通过按键在这两种触发源之间更改,以便适应多种采样方式,请问直接修改寄存器使能或者禁止能达到效果么,为什么我写了不管用,时钟保持在上电开始的配置触发源,该如何实现请各位指教!