读取进程彼此竞争使用的通道，写入进程也一样。
Reading processes compete with each other to use the channel, as do writing processes.
可更改通道的范围来只读取使用中的管脚的值。
Change the range of channels to read only the pins you are using.
主线程把从通道读取的数据写到管道中。
The main thread writes bytes read from the channel into the pipe.
通道参数可以读取多次。
通道参数可以读取多次。
应用推荐