ぱぱーんの日記

void
txput0(byte ch)
{
    // to reduce the cpu consumption,
    // venture to omit txn overflow check.
    // if programmed properly, such an overflow never occurs.
    // rxn(appears later) check is omitted as well.
    txbuf[txn++] = ch;
    txcrc = 0;
}


void
txput1(byte ch)
{
    txbuf[txn++] = ch;
    txcrc = crctbl[txcrc ^ ch];
}


void
txputcrc(boolean force_error)
{
    txput0((force_error) ? ++txcrc : txcrc);
}