📄 modbus.lst
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568 3
569 3 RX1_BufClear();
570 3 RX1_Ready = 0;
571 3 }
572 2 ///////////////////////////////////////////////////////////////////////////////////////////////////
-
573 2
574 2
575 2 //将打包的数据发往总控中心
576 2
577 2 if((addend==1 || addrnd==1))
578 2 {
579 3
580 3 while (!TX0_Ready) ; // wait for transmitter to be available
581 3 TX0_Ready = 0; // claim transmitter
582 3 TX0_ptr = ardata; // set TX buffer pointer to point to
583 3 SENDNUM0=packge;
584 3 TI0 = 1;
585 3
586 3 packge=0;
587 3
588 3 //设置相应标志位
589 3 //下一次打包开始
590 3 addend=0;
591 3 addrnd=0;
592 3
593 3 }
594 2
595 2
596 2
597 2 }
598 1
599 1
600 1 }
601
602
603
604
605
606 //-----------------------------------------------------------------------------
607 // Initialization Subroutines
608 //-----------------------------------------------------------------------------
609
610 //-----------------------------------------------------------------------------
C51 COMPILER V7.50 MODBUS 02/26/2006 22:47:28 PAGE 11
611 // SYSCLK_Init
612 //-----------------------------------------------------------------------------
613 //
614 // This routine initializes the system clock to use an 22.1184MHz crystal
615 // as its clock source.
616 //
617 void SYSCLK_Init (void)
618 {
619 1 int i; // delay counter
620 1
621 1 OSCXCN = 0x67; // start external oscillator with
622 1 // 22.1184MHz crystal
623 1
624 1 for (i=0; i < 256; i++) ; // wait for crystal osc. to start up
625 1
626 1 while (!(OSCXCN & 0x80)) ; // Wait for crystal osc. to settle
627 1
628 1 OSCICN = 0x88; // select external oscillator as SYSCLK
629 1 // source and enable missing clock
630 1 // detector
631 1 }
632
633 //-----------------------------------------------------------------------------
634 // PORT_Init
635 //-----------------------------------------------------------------------------
636 //
637 // Configure the Crossbar and GPIO ports
638 //
639 void PORT_Init (void)
640 {
641 1
642 1 XBR0 = 0x05; // Enable UART0
643 1 XBR1 = 0x00;
644 1 XBR2 = 0x44; // Enable crossbar and weak pull-ups
645 1 P0MDOUT |= 0x11; // enable TX0 as a push-pull output
646 1 P2MDOUT |= 0x03; // enable P2 as push-pull output
647 1
648 1 P74OUT |=0Xf4;
649 1 }
650
651 //-----------------------------------------------------------------------------
652 // UART1_Init
653 //-----------------------------------------------------------------------------
654 //
655 // Configure UART1 using Timer1, for <baudrate> and 8-N-1.
656 //
657 void modbusUART1_Init (void)
658 {
659 1 SCON1 |= 0xd0; // SCON1: mode 1, 8-bit UART, enable RX
660 1 T4CON |=0X30; // Stop Timer; clear int flags; enable
661 1 RCAP4H=0XFF;
662 1 RCAP4L=0XB8;
663 1 T4CON |=0X04; //
664 1
665 1 PCON |= 0x10; // SMOD1 = 1
666 1 EIE2 |= 0x40; // enable UART1 interrupts
667 1
668 1 TX1_Ready = 1; // indicate TX ready for transmit
669 1 RX1_Ready = 0; // indicate RX string not ready
670 1 TX1_ptr = NULL;
671 1
672 1 }
C51 COMPILER V7.50 MODBUS 02/26/2006 22:47:28 PAGE 12
673
674
675 //
676 void UART1_ISR (void) interrupt 20 using 3
677 {
678 1
679 1 static unsigned char TX1_index = 0; // send buffer index
680 1 unsigned char the_char;
681 1
682 1 if ((SCON1 & 0x01) == 0x01)
683 1 { // handle receive function
684 2 SCON1 &= ~0x01; // RI1 = 0; clear RX complete
685 2 if (RX1_Ready == 0) //可以接收
686 2 { the_char = SBUF1;
687 3
688 3 if(RX1_index == 0)
689 3 {
690 4 if(the_char==address)
691 4 {
692 5 RX1_Buf[RX1_index] = the_char;
693 5 RX1_index++;
694 5 RECEIVENUM1=1;
695 5 }
696 4 else
697 4 {
698 5 RX1_index=0;
699 5 }
700 4 }
701 3 else if(RX1_index == 1)
702 3 { if(the_char==0x03)
703 4 {
704 5 RX1_Buf[RX1_index] = the_char;
705 5 RX1_index++;
706 5 RECEIVENUM1=2;
707 5 }
708 4 else
709 4 {
710 5 RX1_index=0;
711 5 }
712 4 }
713 3 else if(RX1_index == 2)
714 3 {
715 4 RX1_Buf[RX1_index] = the_char;
716 4 RX1_index++;
717 4 RECEIVENUM1=3;
718 4 }
719 3 else if(RX1_index > 2)
720 3 {
721 4 if(RX1_index==4+ RX1_Buf[2])
722 4 {
723 5 RX1_Buf[RX1_index] = the_char;
724 5 RECEIVENUM1++;
725 5 RX1_index=0;
726 5 RX1_Ready = 1;
727 5 }
728 4 else
729 4 {
730 5 RX1_Buf[RX1_index] = the_char;
731 5 RX1_index++;
732 5 RECEIVENUM1++;
733 5 }
734 4 }
C51 COMPILER V7.50 MODBUS 02/26/2006 22:47:28 PAGE 13
735 3
736 3 }
737 2
738 2
739 2 }
740 1 else if ((SCON1 & 0x02) == 0x02)
741 1 {
742 2 SCON1 &= ~0x02; // TI1 = 0; clear TX complete
743 2 // indicator
744 2 the_char = *TX1_ptr; // read next character in string
745 2 if(TX1_index<SENDNUM1)
746 2 {
747 3 TX1_ptr++;
748 3 TX1_index++; // get ready for next character
749 3 if(even[the_char]==0)
750 3 SCON1 &= ~0x08;
751 3 else
752 3 SCON1|= 0x08;
753 3 SBUF1 = the_char; // transmit it
754 3
755 3 }
756 2 else
757 2 {
758 3 TX1_Ready = 1; // indicate ready for next TX
759 3 TX1_index=0;
760 3 RE485=0;
761 3 }
762 2 }
763 1 }
764
765
766
767
768
769 //定时器0初始化
770
771 void Timer0_Init (void)
772 {
773 1 TMOD |=0X01;
774 1 TH0=0XB8;
775 1 TL0=0X00;
776 1 ET0=1;
777 1
778 1 }
779
780
781 //---------------------------------------------------------------------------------------
782 //定时器T0溢出中断处理子程序
783 void Timer0_ISR(void) interrupt 1
784 {
785 1 tend=temp;
786 1 if(time>=tend)
787 1 {
788 2 TL0=0X00; //11.0592MHZ T0低8位初值：定时10ms
789 2 TH0=0XB8; //T0高8位初值
790 2 TR0=0; //终止定时器T0
791 2 sendinterval=1;
792 2 time=0;
793 2 }
794 1 else
795 1
796 1 {
C51 COMPILER V7.50 MODBUS 02/26/2006 22:47:28 PAGE 14
797 2
798 2 TL0=0X00; //T0低8位初值：定时50ms
799 2 TH0=0XB8; //T0高8位初值
800 2 time=time+1;
801 2 sendinterval=0;
802 2 }
803 1 }
804 //---------------------------------------------------------------------------------------
805
806
807
808 //-----------------------------------------------------------------------------
809 // UART0_Init
810 //-----------------------------------------------------------------------------
811 //
812 // Configure the UART0 using Timer1, for <baudrate> and 8-N-1.
813 //
814 void UART0_Init (void)
815 {
816 1 SCON0 = 0x50; // SCON0: mode 1, 8-bit UART, enable RX
817 1 TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit reload
818 1 TH1 = 0x6F; // set Timer1 reload value for baudrate
819 1 CKCON |= 0x10; // Timer1 uses SYSCLK as time base
820 1 PCON |= 0x90; // SMOD0 = 1
821 1 ES0 = 1; // enable UART0 interrupts
822 1 TI0 = 0; // Indicate TX0 ready
823 1 TR1 = 1; // start Timer1
824 1
825 1 TX0_Ready = 1; // indicate TX ready for transmit
826 1 RX0_Ready = 0; // indicate RX string not ready
827 1 TX0_ptr = NULL;
828 1 }
829
830
831
832 void UART0_ISR (void) interrupt 4
833 {
834 1
835 1 static unsigned int TX0_index = 0; // send buffer index
836 1 unsigned char the_char0;
837 1
838 1 if (RI0 == 1)
839 1 {
840 2 RI0 = 0;
841 2 if (RX0_Ready == 0) //可以接收
842 2 { the_char0 = SBUF0; // check to see if message pending
843 3 if(RX0_index >=RX0_LENGTH)
844 3 {
845 4 if (the_char0 == RX0_END) //是结束符
846 4 {
847 5 RX0_Buf[RX0_index] = the_char0; // NULL-terminate message
848 5 RX0_Ready = 1; // post message ready
849 5 RX0_index = 0; // reset RX message index
850 5 }
851 4 else //不是结束符
852 4 {
853 5 RX0_Ready =0; // post message ready
854 5 RX0_index = 0; // reset RX message index
855 5
856 5 }
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