DSP算法 SMOOTH: CONVOLVES A MATRIX WITH A 3X3 GAUSSIAN FILTER KERNEL-DSP algorithm SMOOTH: CONVOLVES A MATRIX WITH A 3X3 GAUSSIAN FILTER KERNEL

28335中冠以如何利用3x3键盘的例程，可以参考一下，开发板带的，但是是根据TI官网例程改编的，通用性挺好-28335 in how to use the 3x3 keyboard dubbed routines, you can refer to, the development of the strip, but it is based on TI' s official website routines adaptation, good versatility

利用28335实现的按键扫描程序，能够实现3x3扫描按键，根据不同的按键，数码管显示相应的数字（利用了SPI）-Use 28335 to achieve key scanning procedure, it is possible to scan 3x3 key, depending on the button, digital display the corresponding number (use SPI)