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M4中的通信接口的回环控制,怎么用?

现在在学M4的各种通信方式,想利用一下M4本身的回环模式。自己是了一下,结果都没成。有2点疑问,求指导。

1、使用回环模式时,还要配置各种IO口吗?

2、使用回环模式时,M4本身的类型怎么选?是选主器件还是从器件,如果两都选,好像没办法控制?