By the way, there is another wiring thing you might like to confirm: (1) for UART wiring, we cross over one side of Tx to other side of Rx, and vice versa. (2) Now for SPI, not all developers/vendor follow this rule of thumb: they direct Tx to Tx, and Rx to Rx. Would you like to comment, or counter suggest anything? Please also read the little note at left bottom of the following schematic.