9260 IO口模拟SPI驱动，适合xilinx FPGA固件的加载-9260 IO port analog SPI driver for Xilinx FPGA firmware loading

实现FPGA读取AD转换的数据，AD芯片我采用的是ADS7844，采用的是SPI通信方式-achieve the function of read the data from the AD transform chip.the communciation method is SPI.i have tested the code ,and it can work.

DM8127 串口通信，通过SPI与FPGA通信-DM8127 serial communication, and FPGA via SPI communication