本例程包含了SST25VF016B的底层驱动函数, 演示将一段字符串写入SST25VF016B的1页中，然后读出并通过USART1传送出去，同时LED1亮。字符串：SPI SST25VF016B Example: This is SPI DEMO, 终端上出现这一行字，说明SST25VF016B的读写正常 -This routine contains the function of the underlying drivers of SST25VF016B demo takes a st