Wowbagger Posted November 24, 2020 Posted November 24, 2020 Attempting to connect ILI9341 LCD with XPT2046 Touch to NanoPi NEO Core2 and then migrate to NanoPi Duo2. The ILI9341 / XPT2046 peripheral board has shared SPI with a separate slave chip select for the screen and touch controllers. Starting with hardware datasheet for the H3 I see there is lots of support for different chip select implementations. This makes me think I am on good footing from a hardware perspective. What is not clear to me is how the register support for four slave chip selects translates into pin assignments. Reading through spi-sun6i.c., for example, static int sun6i_spi_transfer_one( ... ) uses SUN6I_TFR_CTL_CS_MANUAL which implies software control but I don't understand where the software control is actually done. I'm sure devtree helps configure the drivers but I'm a bit lost wrt hardware support of four slave devices. I suspect that SPI1 Slave 0 is the default mapping assigned to pin 23. Can the hardware default be changed with hardware support or is this always controlled through driver software? Any pointers would help. WoW
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