我用5501的McBSP1接口与射频芯片SX1257连接,5501的FSX1引脚接SX1257的片选信号,想请教一下怎样设置FSX引脚为高电平或者低电平从而选通SX1257芯片。另,我已将寄存器的FSXM和FSXP位都设成了1,让FSX为输出并且低电平有效。
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我用5501的McBSP1接口与射频芯片SX1257连接,5501的FSX1引脚接SX1257的片选信号,想请教一下怎样设置FSX引脚为高电平或者低电平从而选通SX1257芯片。另,我已将寄存器的FSXM和FSXP位都设成了1,让FSX为输出并且低电平有效。
请问你是要把FSX管脚作为GPIO功能么?
如果是的话,在下面的文档第190页上有配置表。看一下XRST,XIOEN有没有设置?
http://www.ti.com/lit/ug/spru592e/spru592e.pdf