用FPGA实现的ADC采样器,用vhdl编写，spi总线-FPGA implementation using the ADC sampler, prepared using VHDL, spi bus

对AD0809进行操作，将AD转换后的结果直接对对8个发光二极管进行赋值，程序有详细的注释！-Operation of the AD0809 will be the result of AD conversion directly against eight light-emitting diodes for assignment, procedures detailed notes!