SPI-ds1302

代码说明：

  spi协议，分为几个文件块，以供调用，采用时钟芯片ds1302做例子，进行协议的实现，是c程序方面阅读。(spi agreement, the document is divided into several blocks, calling for the use ds1302 clock chip as an example, for the realization of the agreement is c procedures reading.)