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twai_flg
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Wait for eventflag (with timeout).
ER twai_flg (ID flgid, FLGPTN waiptn, MODE wfmode, FLGPTN *p_flgptn, TMO tmout);
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ID flgid;
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ID number of the eventflag to wait for.
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FLGPTN waiptn;
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MODE wfmode;
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TWF_ANDW: AND waiting condition.
TWF_ORW: OR waiting condition.
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FLGPTN *p_flgptn;
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Bit pattern causing a task to be released from waiting.
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TMO tmout;
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Specified timeout (unit:millisecond).
TMO_FEVR: Waiting forever.
Value: Specified timeout.
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This service call checks whether the bit pattern specified by parameter
waiptn and the bit pattern that satisfies the required condition specified by parameter
wfmode are set to the eventflag specified by parameter
flgid.
If a bit pattern that satisfies the required condition has been set for the target eventflag, the bit pattern of the target eventflag is stored in the area specified by parameter
p_flgptn.
If the bit pattern of the target eventflag does not satisfy the required condition when this service call is issued, the invoking task is queued to the target eventflag wait queue.
As a result, the invoking task is unlinked from the ready queue and is moved from the RUNNING state to the WAITING state (WAITING state for an eventflag).
The WAITING state for an eventflag is cancelled in the following cases, and then moved to the READY state.
WAITING State for an Eventflag Cancel Operation
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A bit pattern that satisfies the required condition was set to the target eventflag as a result of issuing set_flg.
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A bit pattern that satisfies the required condition was set to the target eventflag as a result of issuing iset_flg.
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Forced release from waiting (accept rel_wai while waiting).
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Forced release from waiting (accept irel_wai while waiting).
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Polling failure or timeout.
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The following shows the specification format of required condition
wfmode.
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wfmode = TWF_ANDW
Checks whether all of the bits to which 1 is set by parameter
waiptn are set as the target eventflag.
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wfmode = TWF_ORW
Checks which bit, among bits to which 1 is set by parameter
waiptn, is set as the target eventflag.
Note 1 With the RI850V4, whether to enable queuing of multiple tasks to the event flag wait queue is defined during configuration. If this service call is issued for the event flag (TW_WSGL attribute) to which a wait task is queued, therefore, "E_ILUSE" is returned regardless of whether the required condition is immediately satisfied.
TA_WSGL: Only one task is allowed to be in the WAITING state for the eventflag.
TA_WMUL: Multiple tasks are allowed to be in the WAITING state for the eventflag.
Note 2 Invoking tasks are queued to the target event flag (TA_WMUL attribute) wait queue in the order defined during configuration (FIFO order or priority order).
Note 3 The RI850V4 performs bit pattern clear processing (0x0 setting) when the required condition of the target eventflag (TA_CLR attribute) is satisfied.
Note 4 If the event flag wait state is cancelled because
rel_wai or
irel_wai was issued or the wait time elapsed, the contents in the area specified by parameter
p_flgptn become undefined.
Note 5 TMO_FEVR is specified for wait time
tmout, processing equivalent to
wai_flg will be executed. When TMO_POL is specified, processing equivalent to
pol_flg /
ipol_flg will be executed.
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- flgid > Maximum ID number
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- This service call was issued from a non-task.
- This service call was issued in the CPU locked state.
- This service call was issued in the dispatching disabled state.
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Illegal service call use.
- There is already a task waiting for an eventflag with the TA_WSGL attribute.
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- Specified eventflag is not registered.
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Forced release from the WAITING state.
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- Polling failure or timeout.
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