[ThreadX, 6] system clock & timer

timer:

• application timer，與HW timer類似，但不同的地方在於，他們不能相互中斷。
• 範例:

/* Create an application timer that executes "my_timer_function" after 100 timer-ticks initially and then

after every 25 timer-ticks. This timer is specified to start immediately. */

status = tx_timer_create(&my_timer,"my_timer_name", my_timer_function, 0x1234, 100, 25, TX_AUTO_ACTIVATE);

• 假設多個timer時間周其設一樣，其執行順序會按照啟動順序。
• priority 0

system clock:

• 時間計算是以tick為單位(通常是10ms)。
• measure performance:

current_time  tx_time_get();

printf(“Current Time: %5lu Speedy_Thread finished cycle...\n”, current_time);