OS_TIMER specifies the on-chip timer used as a time-base
for the real-time system. It delivers a periodic interrupt that
wakes up a time-keeping system task. The user can choose which
timer serves this purpose:
ARM7/ARM9 library version
Use 0 for Timer 0, or 1 for Timer 1, etc.
Cortex-M library version
Use 0 for Core SysTick Timer, or 1 for alternate Peripheral
Timer.
#define OS_TIMER 1
OS_CLOCK specifies the input clock frequency for the
selected timer.
#define OS_CLOCK 15000000
OS_TICK specifies the timer tick interval in µsec.
Recommended values are 1000 to 100000. The resulting interval is
from 1 ms to 100 ms. Default configuration is for 10 ms.
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