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有没有DSP 使用74LS165 SPI传输的相关例程?

Other Parts Discussed in Thread: ADS8332, TMS320F28335

目前在做一个和键盘相关的项目,键盘使用74LS165扩展8个按键使用SPI与DSP传输,请问有没有相关的SPI 74LS165通信的例程?为什么我配置了74LS165的SH/LD引脚,并且在主程序中进行高低电平切换等待按键值传输,但是键盘按下后SPI的RXFFST寄存器中一直显示0?