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bb black spi



大家好:

我使用的bb black 的开发板,由于需要使用到spi接口,于是使用内核自带的spi测试文件,将收和发管教短接起来,发现可以自发自收,但是片选信号一直为高电平,这个是啥原因啊?有没有遇到相似的情况?请大神帮帮忙.