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ADS7223的spi时序问题

Other Parts Discussed in Thread: ADS7223

1、ADS7223用的是spi协议,要往寄存器里面写值,在第20个spi clk加RD信号,将SDI数据读入寄存器中,可是spi 的clk是一直存在的,那该怎么判断第20个时钟到来的时刻呢?

2、有什么好的办法可以解决这个时序问题?有没有ADS7223的驱动代码可以参考?

谢谢!