Check that #define-d PIN combinations make sense at compile-time #204
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gh-raspberrypi/pico-sdk#204
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(as initially suggested in #192)
It might be nice to have a compile-time #error if you give an invalid combination of UART_DEFAULT settings? e.g. setting {PICO_DEFAULT_UART=0, PICO_DEFAULT_UART_TX_PIN=13} (invalid because GPIO13 is UART0 RX) or {PICO_DEFAULT_UART=1, PICO_DEFAULT_UART_TX_PIN=0} (invalid because GPIO0 is UART0 TX).
(with similar things being done for I2C and SPI pins too)
#1724 has been merged into develop