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配置MCASP的时候，对XSTAT进行清零操作 mcasp->regs->XSTAT &= ~(0x00000020);发现没有效果。前后所做的操作是将一路数据收发增加到两路收发。
为什么之前可以操作的寄存器却变得无法操作了呢？
