spi——HOST可以实现SPI的HOST 7:1 LVDS -this IS 7:1 LVDS transfer and SPI_host control

利用SPI控制数码管显示,SPI接收按键执行响应操作-Control digital control using SPI, SPI implementation of response actions to receive keys

SPI通信---pic18系列单片机编程实现使用MAX7219控制4位7段数码管显示数字：0 1 2 3。-SPI communication--- pic18 series microcontroller programming using the MAX7219 control four 7-segment LED display digits: 0123.