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CC2340R5: sem_wait的tick單位

Part Number: CC2340R5
Other Parts Discussed in Thread: CC2640

想問一下 我想讓sem_wait()等待30ms之後就跳出來 我該怎麼設定?
我看了一下原本是semaphorePend(obj->sem, portMAX_DELAY);
#define portMAX_DELAY 0xffffffffUL
這是以 System Clock 1/48M 去算的嗎?