if (beep == 0) {
lpc_ct32b1.tcr = ((0 << LPC_CT32B_TCR_CEN) |
(1 << LPC_CT32B_TCR_CRST));
- lpc_scb.sysahbclkctrl &= ~(1 << LPC_SCB_SYSAHBCLKCTRL_CT32B1);
+ lpc_scb.sysahbclkctrl &= ~(1UL << LPC_SCB_SYSAHBCLKCTRL_CT32B1);
} else {
lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_CT32B1);