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ec7c93789a
- spi.h (spi_off), spi.c: disable the UART - spi.c (spi_initialized, spi_begin, spi_init): initialize the UART if necessary - board_app.c (gpio): call spi_off to disable the UART instead of open-coding the operation - board_app.c (gpio): don't explicitly re-enable the UART but defer it to the next communication