5508dc2afe
Previously the polarity was for TTL levels, which are the reverse of RS-232. Also add handling of the UART_PPS_INVERT_PULSE option bit in the sysctl value, the same as was recently added to uart(4), so that people using TTL level connections can request a logical inverting of the signal. Use the named constants from the new dev/uart/uart_ppstypes.h for the pps capture modes and option bits.