Hi Tao, [quote user="Tao Zhang"]It seems SPI_CS is not from the same SPI IP as other SPI signals. Is this correct?[/quote] Yes that is correct. [quote user="Tao Zhang"] Does SPI TI_RTOS driver supports SPI 4-wire option with CS? How to configure it?[/quote] No it does not. Please take a look at TI-RTOS 2.20 User's Guide - Texas Instruments section 5.11.7 Master/Slave Modes "Asserting on Chip Select". Regards, David
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