?? scu_bm.lst
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472 3 return;
473 3 }
474 2
475 2 TI = 0;
476 2 TB8 = 1; // Set 'Command' bit
477 2 SBUF = Slave_ID;
478 2 }
479 1 else
480 1 {
481 2 // Message_byte_G is 1, send the data byte
482 2 Timeout = 0;
483 2 while ((++Timeout) && (TI == 0));
484 2
485 2 if (Timeout == 0)
486 2 {
487 3 // usart did not respond - error
488 3 Error_code_G = ERROR_USART_TI;
489 3 return;
C51 COMPILER V6.10 SCU_BM 04/19/2001 13:58:56 PAGE 9
490 3 }
491 2
492 2 TI = 0;
493 2 TB8 = 0;
494 2 SBUF = Tick_message_data_G[SLAVE_INDEX];
495 2 }
496 1
497 1 // Data sent - return
498 1 }
499
500
501 /*------------------------------------------------------------------*-
502
503 SCU_B_MASTER_Process_Ack()
504
505 Make sure the slave (SLAVE_ID) has acknowledged the previous
506 message that was sent. If it has, extract the message data
507 from the USART hardware: if not, call the appropriate error
508 handler.
509
510 Slave_index - The index of the slave.
511
512 RETURNS: RETURN_NORMAL - Ack received (data in Ack_message_data_G)
513 RETURN_ERROR - No ack received (-> no data)
514
515 -*------------------------------------------------------------------*/
516
517 bit SCU_B_MASTER_Process_Ack(const tByte Slave_index)
518 {
519 1 tByte Message_contents;
520 1 tByte Slave_ID;
521 1
522 1 // First time this is called there is no ack tick to check
523 1 // - we simply return 'OK'
524 1 if (First_ack_G)
525 1 {
526 2 First_ack_G = 0;
527 2 return RETURN_NORMAL;
528 2 }
529 1
530 1 // Find the slave ID for this slave
531 1 Slave_ID = (tByte) Current_Slave_IDs_G[Slave_index];
532 1
533 1 // Data should already be in the buffer
534 1 if (RI == 0)
535 1 {
536 2 // Slave has not replied to last tick message
537 2
538 2 // Set error LED
539 2 Network_error_pin = NETWORK_ERROR;
540 2
541 2 return RETURN_ERROR;
542 2 }
543 1
544 1 // There is data - get it
545 1 Message_contents = (tByte) SBUF;
546 1 RI = 0;
547 1
548 1 // This is the reply to the last message
549 1 // - reverse the message byte interpretation
550 1 if (Message_byte_G == 1)
551 1 {
C51 COMPILER V6.10 SCU_BM 04/19/2001 13:58:56 PAGE 10
552 2 // Check the 'command bit' is set
553 2 if (RB8 == 1)
554 2 {
555 3 // Check that the ID is correct
556 3 if (Slave_ID == (tByte) Message_contents)
557 3 {
558 4 // Required Ack message was received
559 4 return RETURN_NORMAL;
560 4 }
561 3 }
562 2
563 2 // Something is wrong...
564 2
565 2 // Set error LED
566 2 Network_error_pin = NETWORK_ERROR;
567 2
568 2 return RETURN_ERROR;
569 2 }
570 1 else
571 1 {
572 2 // There *ARE* data available
573 2 // Extract the data from the slave message
574 2 //
575 2 // NOTE: We *assume* these data are OK
576 2 // - you may wish to send crucial data twice, etc.
577 2 Ack_message_data_G[Slave_index] = Message_contents;
578 2
579 2 return RETURN_NORMAL; // return the slave data
580 2 }
581 1 }
582
583 /*------------------------------------------------------------------*-
584
585 SCU_B_MASTER_Reset_the_Network()
586
587 This function resets (that is, restarts) the whole network.
588
589 -*------------------------------------------------------------------*/
590 void SCU_B_MASTER_Reset_the_Network(void)
591 {
592 1 EA = 0; // Disable interrupts
593 1 while(1); // Watchdog will time out
594 1 }
595
596 /*------------------------------------------------------------------*-
597
598 SCU_B_MASTER_Shut_Down_the_Network()
599
600 This function shuts down the whole network.
601
602 -*------------------------------------------------------------------*/
603 void SCU_B_MASTER_Shut_Down_the_Network(void)
604 {
605 1 EA = 0; // Disable interrupts
606 1
607 1 Network_error_pin = NETWORK_ERROR;
608 1 SCH_Report_Status(); // Sch not running - do this manually
609 1
610 1 while(1)
611 1 {
612 2 SCU_B_MASTER_Watchdog_Refresh();
613 2 }
C51 COMPILER V6.10 SCU_BM 04/19/2001 13:58:56 PAGE 11
614 1 }
615
616
617 /*------------------------------------------------------------------*-
618
619 SCU_B_MASTER_Enter_Safe_State()
620
621 This is the state enterted by the system when:
622 (1) The node is powered up or reset
623 (2) The Master node cannot detect a slave
624 (3) The network has an error
625
626 Try to ensure that the system is in a 'safe' state in these
627 circumstances.
628
629 -*------------------------------------------------------------------*/
630 void SCU_B_MASTER_Enter_Safe_State(void)
631 {
632 1 // USER DEFINED - Edit as required
633 1 TRAFFIC_LIGHTS_Display_Safe_Output();
634 1 }
635
636 /*------------------------------------------------------------------*-
637
638 SCU_B_MASTER_Watchdog_Init()
639
640 This function sets up the watchdog timer.
641
642 If the Master fails (or other error develop),
643 no tick messages will arrive, and the scheduler
644 will stop.
645
646 To detect this situation, we have a (hardware) watchdog
647 running in the slave. This watchdog - which should be set to
648 overflow at around 100ms - is used to set the system into a
649 known (safe) state. The slave will then wait (indefinitely)
650 for the problem to be resolved.
651
652 NOTE: The slave will not be generating Ack messages in these
653 circumstances. The Master (if running) will therefore be aware
654 that there is a problem.
655
656 -*------------------------------------------------------------------*/
657 void SCU_B_MASTER_Watchdog_Init(void)
658 {
659 1 // INIT NOT REQUIRED FOR 1232 EXTERNAL WATCHDOG
660 1 // - May be required wwith different watchdog hardware
661 1 //
662 1 // Edit as required
663 1 }
664
665
666 /*------------------------------------------------------------------*-
667
668 SCU_B_MASTER_Watchdog_Refresh()
669
670 Feed the external (1232) watchdog.
671
672 Timeout is between ~60 and 250 ms (hardware dependent)
673
674 Assumes external 1232 watchdog
675
C51 COMPILER V6.10 SCU_BM 04/19/2001 13:58:56 PAGE 12
676 -*------------------------------------------------------------------*/
677 void SCU_B_MASTER_Watchdog_Refresh(void) reentrant
678 {
679 1 // Change the state of the watchdog pin
680 1 if (WATCHDOG_state_G == 1)
681 1 {
682 2 WATCHDOG_state_G = 0;
683 2 WATCHDOG_pin = 0;
684 2 }
685 1 else
686 1 {
687 2 WATCHDOG_state_G = 1;
688 2 WATCHDOG_pin = 1;
689 2 }
690 1 }
691
692
693 /*------------------------------------------------------------------*-
694 ---- END OF FILE -------------------------------------------------
695 -*------------------------------------------------------------------*/
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 779 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 15 15
IDATA SIZE = ---- ----
BIT SIZE = 3 2
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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