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您好，SPI时序应该是不对的，所以PGA113并未进行有效的SPI通讯，所以一直处于默认的增益状态，即为Gain=1.
正常情况下，CS从下降沿到CS上升沿来临前，必须是16个clock 的偶数倍数，您这里只有15个clock。
If there are not even-numbered increments of 16 clocks (that is, 16, 32, 64, and so forth) between CS going low
(falling edge) and CS going high (rising edge), the device takes no action
