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ASC0 & ASC1 simultaneously using with PRINTF

Aw S

I want to use PRINTF function to send different data to ASC0 and ASC1 simultaneosly. If i change _getkey and putchar in LIB for ASC1, so PRINTF will send data to ASC1. How to write new PRINTF_1 for ASC1 while using PRINTF from stdio.h with ASC0?

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    If you can guarantee that in your application printf for ASC0 and ASC1 will not be called simultaneously (no reentrancy for printf), then you can do a simple trick:

    /* define a global flag somewhere */
bit asc_to_use = 0;

char putchar(char c)
{
    switch ( asc_to_use )
    {
    case 0:
        /* send byte using ASC0 */
        break;
    case 1:
        /* send byte using ASC1 */
    }
}
    then assign required asc_to_use channel before each call to printf.

    - mike

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  • 0

    If you can guarantee that in your application printf for ASC0 and ASC1 will not be called simultaneously (no reentrancy for printf), then you can do a simple trick:

    /* define a global flag somewhere */
bit asc_to_use = 0;

char putchar(char c)
{
    switch ( asc_to_use )
    {
    case 0:
        /* send byte using ASC0 */
        break;
    case 1:
        /* send byte using ASC1 */
    }
}
    then assign required asc_to_use channel before each call to printf.

    - mike

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