time delay microseconds

tomaslipka — Tue, 02 Apr 2013 11:38:05 GMT

Hi, I need the MQX function for time delay in microseconds, I tried to modify the _time_delay () that is only for milliseconds, but without success. I'm using the TWR-PXN20 with CW10.2 + MQX3.8. do you know how to solve this problem? I need a similar function as _time_delay () but for a microsecond.

Here is my attempt to edit the function _time_delay :
The function works correctly when microseconds> = 1000. but when microsecond <1000 the function still behaves as if the delay was set to 1000US (1ms).

void _time_delay_mikro
    (
       / * [IN] the number of mikroseconds to delay * /
       register uint_32 mikroseconds
    )
{/ * Body * /
    register KERNEL_DATA_STRUCT_PTR kernel_data;
    register TD_STRUCT_PTR td_ptr_;
# if MQX_ENABLE_USER_MODE && MQX_ENABLE_USER_STDAPI
     if (MQX_RUN_IN_USER_MODE) {
         _usr_time_delay (mikroseconds);
         return;
     }
# endif

    _GET_KERNEL_DATA (Kernel_data);

    _KLOGE2 (KLOG_time_delay, mikroseconds);

    if (! mikroseconds) {
       _KLOGX1 (KLOG_time_delay);
       return;
    } / * Endif * /

    td_ptr_ = kernel_data-> ACTIVE_PTR;

    _int_disable ();
    / * PSP_TIME_TO_TICKS (& time, & td_ptr-> TIMEOUT); * /
    / / PSP_MILLISECONDS_TO_TICKS_QUICK (mikroseconds, & td_ptr-> TIMEOUT);
    PSP_MICROSECONDS_TO_TICKS (mikroseconds, & td_ptr_-> TIMEOUT);

    / * Calculate time to wake up the task * /
    PSP_ADD_TICKS (& td_ptr_-> TIMEOUT, & kernel_data-> TIME & td_ptr_-> TIMEOUT);

    _time_delay_internal (td_ptr_);

    _int_enable ();

    _KLOGX1 (KLOG_time_delay);

} / * Endbody * /

Thank you for your answers.

Re: time delay microseconds

c0170 — Tue, 02 Apr 2013 13:11:03 GMT

Hello Tomas Lipka,

this was already asked & answered here :

Delay in microsecond

Does it help you ? Share the result, thank you.

Regards,

0xc0170

Re: time delay microseconds

Monica — Tue, 09 Apr 2013 23:18:57 GMT

Hello Tomas!

Did that hint work?

Best regards!

Monica

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