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    • Redirecting printf with a custom, non-global, callback

    Posted by dautrevaux on 2020-01-23 10:04 France

    Hi,

    The simplest way to go is through __io_putchar that you can define, e.g. in the file in which you place the display initialization code, as it is declared as weak in syscalls.c. To print on your display you can write it as
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    int __io_putchar(char c) {
    return display_write(&board.display[displayA], c); 
}

    For this to work, of course, you must declare the board variable as a global static variable (not in the display initialization function) and move the display_init (and perhaps board_init) call in the display initialization function.

    Then any printf/write with go to your display

    HTH

    Bernard (Ac6)

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