Skip to content
  • Dave Hylands's avatar
    stmhal: Increase the priority of UART IRQ. · c8437f97
    Dave Hylands authored
    The UARTs have no FIFOs, so if interrupts are disabled
    for more than a character time (10 usec at 1 Mbit/sec)
    then characters get dropped.
    The overhead for handling a UART ISR is about 0.5 usec,
    so even at baud rates of 1 Mbit/sec this only corresponds
    to about 5% of the CPU. Lower baud rates will have less
    of an impact.