The hardware clock interface.
Clock scale 0 - off 1 - 32768 ticks/second 2 - 4096 ticks/second 3 - 1024 ticks/second 4 - 512 ticks/second 5 - 256 ticks/second 6 - 128 ticks/second 7 - 32 ticks/second
Interval is how many ticks per clock firing. For example, setRate(160,7) will result in an event every 160/32 seconds. See also: Clock.h for predefined macros:
Clock.h
interval scale result TOS_I1000PS TOS_S1000PS 1000 ticks/sec TOS_I100PS TOS_S100PS 100 ticks/sec TOS_I10PS TOS_S10PS 10 ticks/sec TOS_I4096PS TOS_S4096PS 4096 ticks/sec TOS_I2048PS TOS_S2048PS 2048 ticks/sec TOS_I1024PS TOS_S1024PS 1024 ticks/sec TOS_I512PS TOS_S512PS 512 ticks/sec TOS_I256PS TOS_S256PS 256 ticks/sec TOS_I128PS TOS_S128PS 128 ticks/sec TOS_I64PS TOS_S64PS 64 ticks/sec TOS_I32PS TOS_S32PS 32 ticks/sec TOS_I16PS TOS_S16PS 16 ticks/sec TOS_I8PS TOS_S8PS 8 ticks/sec TOS_I4PS TOS_S4PS 4 ticks/sec TOS_I2PS TOS_S2PS 2 ticks/sec TOS_I1PS TOS_S1PS 1 tick/sec TOS_I0PS TOS_S0PS 0 ticks/sec (clock off)