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请问官方是否有使用PRU实现模拟SPI接口协议的示例？
TI的PRU example里没有模拟SPI的例程。http://www.ti.com/tool/pru-swpkg
这里有更多例程，好像也没有SPI的。TI的SPI接口都是多片选的，还不够用吗？
http://processors.wiki.ti.com/index.php/PRU_Projects
