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b061230056
old: CCOMPARE timer triggers when CCOUNT increase to equal to CCOMPARE, then ISR will increase integer of "_xt_tick_divisor"
to CCOMPARE and wait for next interrupt triggering
now: CCOMPARE timer triggers when CCOUNT increase to equal to CCOMPARE, then ISR will reset CCOUNT to be 0 and reset CCOMPARE
to be integer of "_xt_tick_divisor", then wait for next interrupt triggering
Using the new method, we may get the CCOUNT value without considing if it has overflowed.
System running microseconds = g_os_ticks * microseconds per tick + CCOUNT.
Each real time kernel port consists of three files that contain the core kernel components and are common to every port, and one or more files that are specific to a particular microcontroller and or compiler. + The FreeRTOS/Source directory contains the three files that are common to every port - list.c, queue.c and tasks.c. The kernel is contained within these three files. croutine.c implements the optional co-routine functionality - which is normally only used on very memory limited systems. + The FreeRTOS/Source/Portable directory contains the files that are specific to a particular microcontroller and or compiler. + The FreeRTOS/Source/include directory contains the real time kernel header files. See the readme file in the FreeRTOS/Source/Portable directory for more information.