Hi Nick, Your "ADS8368_SELECT_CHANNEL_1 0x8x0" is the right address and data to write Manual Mode Register(address=04h) to select channel(e.g. 0x810 for Channel 1), but you did not show the detail about your Ads8638TxRx( ) function and I do not know how your function combine/create the final operation code and output on SDI, also I do not know what your ADC ADDRESS = 1000 is, please help to explain on these, thanks. Also, a timing plot (/CS,SCLK,DIN and DOUT) for a command writing will be very helpful to address the issue, thanks. Best regards Dale
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