STAT_RX_THLD
if (status & STAT_RX_THLD)
pio->enabled_irqs &= ~STAT_RX_THLD;
if (!(pio_reg_read(INTR_STATUS) & STAT_RX_THLD))
pio->enabled_irqs |= STAT_RX_THLD;
pio->enabled_irqs &= ~STAT_RX_THLD;