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用mcbsp外接E1芯片，一共4路E1，每路E1 32个时隙
数据流 CPU->EDMA->McBsp->E1 E1->McBsp->EDMA->CPU
收发都使用ping pong方式处理
1、有没有这方面的例子可以参考？
2、按照20ms一个语言数据包的要求，发送buffer 16bits*128*160，接收buffer 32bits*128*160。
EDMA的通道里面的A B C大小应该怎么配置啊？
