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54x 系列 MCBSP的奇怪问题

Other Parts Discussed in Thread: TMS320VC5416

 用的tms320vc5416芯片   mcbsp配置的接收时钟和帧同步全是外部  一帧发送32个字节 一个字节8位  测试程序只开了一个发送中断  一直发送0x0023  用示波器量发送引脚  总是一帧有数据 一帧全是低电平  一直这样循环   不清楚是哪的问题   拜托分析一下可能出问题的地方