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How the os_wait function work for delay ?

Nantian Gumo

Using rtx51tny in a at89s52 system,
xtal :24MHz
INT_CLOCK : 10000 cycles (tick period : 5ms)

In a delay sub take os_wait ( K_TMO , 1, 0);.When simulator ,firstly the function take 0.0047005sec(sim to 5ms) for running,secondly,thirdly the function take 0.002962sec & 0.002963sec ,and so on.when changed paramat as os_wait ( K_TMO , 300, 0);,the function take 0.2217675sec to finish. why does the function os_wait ( K_TMO , 1, 0); not take 5ms?

  • 0

    Note that the argument to os_wait cannot be greater than a byte (255 is therefore the maxium value.

    This therefore fails os_wait ( K_TMO , 300, 0);

    Also keep in mind that the execution is sychnonized with the hardware timer. os_wait ( K_TMO , 1, 0); effectively waits for the next timer tick (which might come instantly after the function call).