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Printf() size, questions?

Ted Dubroff

How many bytes will printf() take up in a non debug-monitor
environment?

Also, is it easy to set up printf() to map to a second UART?
I will need control of the UART ISR so that I can handle receives
appropriately. How will this confict with printf()?

Parents
  • 0 in reply to aijun xu

    I'd write my own putchar() like this:

    char putchar(char outChar)
{
    TI   = 0;
    SBUF = outChar;
    while (!TI);
    return outChar;
}
    And the escaped version would escape any control chars like STX or DLE with DLE, which stands for Data Link Escape.
    void putFiltByte(U8 outByte)
{
    if (STX == outByte || DLE == outByte)
    {
        // Escape this data char.
        putchar(DLE);

        // Ensure this data char. is never an STX or DLE.
        outByte += ' ';
    }

    putchar(outByte);
}
    Now, on the receive end, when ever you see an STX you know it means Start of Transmission (of a new packet). And when ever you see a DLE you know to subtract ' ' (space) from the next char received.

    - Mark

Reply
  • 0 in reply to aijun xu

    I'd write my own putchar() like this:

    char putchar(char outChar)
{
    TI   = 0;
    SBUF = outChar;
    while (!TI);
    return outChar;
}
    And the escaped version would escape any control chars like STX or DLE with DLE, which stands for Data Link Escape.
    void putFiltByte(U8 outByte)
{
    if (STX == outByte || DLE == outByte)
    {
        // Escape this data char.
        putchar(DLE);

        // Ensure this data char. is never an STX or DLE.
        outByte += ' ';
    }

    putchar(outByte);
}
    Now, on the receive end, when ever you see an STX you know it means Start of Transmission (of a new packet). And when ever you see a DLE you know to subtract ' ' (space) from the next char received.

    - Mark

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