/// read one character
uint8_t serial_popchar()
{
uint8_t c = 0;
// it's imperative that we check, because if the buffer is empty and we pop, we'll go through the whole buffer again
if (buf_canread(rx))
buf_pop(rx, c);
#ifdef XONXOFF
if ((flowflags & FLOWFLAG_STATE_XON) == 0 && buf_canread(rx) <= 16) {
// the buffer has (BUFSIZE - 16) free characters again, so send an XON
flowflags = FLOWFLAG_SEND_XON;
UCSR0B |= MASK(UDRIE0);
}
#endif
return c;
}
/*---------------------------------------------------------------------------*/
static void
acked(void)
{
buf_pop(&buf, s.numsent);
}
