📄 os_mbox.lst
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435 *
436 * Description: This function sends a message to a mailbox
437 *
438 * Arguments : pevent is a pointer to the event control block associated with the desired mailbox
439 *
440 * pmsg is a pointer to the message to send. You MUST NOT send a NULL pointer.
441 *
442 * Returns : OS_ERR_NONE The call was successful and the message was sent
443 * OS_ERR_MBOX_FULL If the mailbox already contains a message. You can can only send one
444 * message at a time and thus, the message MUST be consumed before you
445 * are allowed to send another one.
446 * OS_ERR_EVENT_TYPE If you are attempting to post to a non mailbox.
447 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer
448 * OS_ERR_POST_NULL_PTR If you are attempting to post a NULL pointer
449 *
450 * Note(s) : 1) HPT means Highest Priority Task
451 *********************************************************************************************************
452 */
453
454 #if OS_MBOX_POST_EN > 0
\ In segment CODE, align 4, keep-with-next
455 INT8U OSMboxPost (OS_EVENT *pevent, void *pmsg)
456 {
\ OSMboxPost:
\ 00000000 70B5 PUSH {R4-R6,LR}
\ 00000002 0400 MOVS R4,R0
\ 00000004 0D00 MOVS R5,R1
457 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
458 OS_CPU_SR cpu_sr = 0;
459 #endif
460
461
462
463 #if OS_ARG_CHK_EN > 0
464 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
465 return (OS_ERR_PEVENT_NULL);
466 }
467 if (pmsg == (void *)0) { /* Make sure we are not posting a NULL pointer */
468 return (OS_ERR_POST_NULL_PTR);
469 }
470 #endif
471 if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
\ 00000006 2078 LDRB R0,[R4, #+0]
\ 00000008 0128 CMP R0,#+1
\ 0000000A 01D0 BEQ.N ??OSMboxPost_0
472 return (OS_ERR_EVENT_TYPE);
\ 0000000C 0120 MOVS R0,#+1
\ 0000000E 70BD POP {R4-R6,PC}
473 }
474 OS_ENTER_CRITICAL();
\ ??OSMboxPost_0:
\ 00000010 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rT
\ 00000014 0600 MOVS R6,R0
475 if (pevent->OSEventGrp != 0) { /* See if any task pending on mailbox */
\ 00000016 A07A LDRB R0,[R4, #+10]
\ 00000018 0028 CMP R0,#+0
\ 0000001A 0CD0 BEQ.N ??OSMboxPost_1
476 /* Ready HPT waiting on event */
477 (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
\ 0000001C 0023 MOVS R3,#+0
\ 0000001E 0222 MOVS R2,#+2
\ 00000020 2900 MOVS R1,R5
\ 00000022 2000 MOVS R0,R4
\ 00000024 ........ _BLF OS_EventTaskRdy,??OS_EventTaskRdy??rT
478 OS_EXIT_CRITICAL();
\ 00000028 3000 MOVS R0,R6
\ 0000002A ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
479 OS_Sched(); /* Find highest priority task ready to run */
\ 0000002E ........ _BLF OS_Sched,??OS_Sched??rT
480 return (OS_ERR_NONE);
\ 00000032 0020 MOVS R0,#+0
\ 00000034 70BD POP {R4-R6,PC}
481 }
482 if (pevent->OSEventPtr != (void *)0) { /* Make sure mailbox doesn't already have a msg */
\ ??OSMboxPost_1:
\ 00000036 6068 LDR R0,[R4, #+4]
\ 00000038 0028 CMP R0,#+0
\ 0000003A 04D0 BEQ.N ??OSMboxPost_2
483 OS_EXIT_CRITICAL();
\ 0000003C 3000 MOVS R0,R6
\ 0000003E ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
484 return (OS_ERR_MBOX_FULL);
\ 00000042 1420 MOVS R0,#+20
\ 00000044 70BD POP {R4-R6,PC}
485 }
486 pevent->OSEventPtr = pmsg; /* Place message in mailbox */
\ ??OSMboxPost_2:
\ 00000046 6560 STR R5,[R4, #+4]
487 OS_EXIT_CRITICAL();
\ 00000048 3000 MOVS R0,R6
\ 0000004A ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
488 return (OS_ERR_NONE);
\ 0000004E 0020 MOVS R0,#+0
\ 00000050 70BD POP {R4-R6,PC} ;; return
489 }
490 #endif
491
492 /*$PAGE*/
493 /*
494 *********************************************************************************************************
495 * POST MESSAGE TO A MAILBOX
496 *
497 * Description: This function sends a message to a mailbox
498 *
499 * Arguments : pevent is a pointer to the event control block associated with the desired mailbox
500 *
501 * pmsg is a pointer to the message to send. You MUST NOT send a NULL pointer.
502 *
503 * opt determines the type of POST performed:
504 * OS_POST_OPT_NONE POST to a single waiting task
505 * (Identical to OSMboxPost())
506 * OS_POST_OPT_BROADCAST POST to ALL tasks that are waiting on the mailbox
507 *
508 * OS_POST_OPT_NO_SCHED Indicates that the scheduler will NOT be invoked
509 *
510 * Returns : OS_ERR_NONE The call was successful and the message was sent
511 * OS_ERR_MBOX_FULL If the mailbox already contains a message. You can can only send one
512 * message at a time and thus, the message MUST be consumed before you
513 * are allowed to send another one.
514 * OS_ERR_EVENT_TYPE If you are attempting to post to a non mailbox.
515 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer
516 * OS_ERR_POST_NULL_PTR If you are attempting to post a NULL pointer
517 *
518 * Note(s) : 1) HPT means Highest Priority Task
519 *
520 * Warning : Interrupts can be disabled for a long time if you do a 'broadcast'. In fact, the
521 * interrupt disable time is proportional to the number of tasks waiting on the mailbox.
522 *********************************************************************************************************
523 */
524
525 #if OS_MBOX_POST_OPT_EN > 0
\ In segment CODE, align 4, keep-with-next
526 INT8U OSMboxPostOpt (OS_EVENT *pevent, void *pmsg, INT8U opt)
527 {
\ OSMboxPostOpt:
\ 00000000 F0B5 PUSH {R4-R7,LR}
\ 00000002 0400 MOVS R4,R0
\ 00000004 0D00 MOVS R5,R1
\ 00000006 1600 MOVS R6,R2
528 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
529 OS_CPU_SR cpu_sr = 0;
530 #endif
531
532
533
534 #if OS_ARG_CHK_EN > 0
535 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
536 return (OS_ERR_PEVENT_NULL);
537 }
538 if (pmsg == (void *)0) { /* Make sure we are not posting a NULL pointer */
539 return (OS_ERR_POST_NULL_PTR);
540 }
541 #endif
542 if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
\ 00000008 2078 LDRB R0,[R4, #+0]
\ 0000000A 0128 CMP R0,#+1
\ 0000000C 01D0 BEQ.N ??OSMboxPostOpt_0
543 return (OS_ERR_EVENT_TYPE);
\ 0000000E 0120 MOVS R0,#+1
\ 00000010 F0BD POP {R4-R7,PC}
544 }
545 OS_ENTER_CRITICAL();
\ ??OSMboxPostOpt_0:
\ 00000012 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rT
\ 00000016 0700 MOVS R7,R0
546 if (pevent->OSEventGrp != 0) { /* See if any task pending on mailbox */
\ 00000018 A07A LDRB R0,[R4, #+10]
\ 0000001A 0028 CMP R0,#+0
\ 0000001C 1AD0 BEQ.N ??OSMboxPostOpt_1
547 if ((opt & OS_POST_OPT_BROADCAST) != 0x00) { /* Do we need to post msg to ALL waiting tasks ? */
\ 0000001E F007 LSLS R0,R6,#+31
\ 00000020 09D5 BPL.N ??OSMboxPostOpt_2
548 while (pevent->OSEventGrp != 0) { /* Yes, Post to ALL tasks waiting on mailbox */
\ ??OSMboxPostOpt_3:
\ 00000022 A07A LDRB R0,[R4, #+10]
\ 00000024 0028 CMP R0,#+0
\ 00000026 0CD0 BEQ.N ??OSMboxPostOpt_4
549 (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
\ 00000028 0023 MOVS R3,#+0
\ 0000002A 0222 MOVS R2,#+2
\ 0000002C 2900 MOVS R1,R5
\ 0000002E 2000 MOVS R0,R4
\ 00000030 ........ _BLF OS_EventTaskRdy,??OS_EventTaskRdy??rT
\ 00000034 F5E7 B.N ??OSMboxPostOpt_3
550 }
551 } else { /* No, Post to HPT waiting on mbox */
552 (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
\ ??OSMboxPostOpt_2:
\ 00000036 0023 MOVS R3,#+0
\ 00000038 0222 MOVS R2,#+2
\ 0000003A 2900 MOVS R1,R5
\ 0000003C 2000 MOVS R0,R4
\ 0000003E ........ _BLF OS_EventTaskRdy,??OS_EventTaskRdy??rT
553 }
554 OS_EXIT_CRITICAL();
\ ??OSMboxPostOpt_4:
\ 00000042 3800 MOVS R0,R7
\ 00000044 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
555 if ((opt & OS_POST_OPT_NO_SCHED) == 0) { /* See if scheduler needs to be invoked */
\ 00000048 7007 ⌨️ 快捷键说明
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