Freescale 9S12 系列单片机应用笔记（SCI）3

2. if(pbuf->RingBufTxOutPtr==&pbuf->if(pbuf->RingBufTxOutPtr==&pbuf->RingBufTx[SCI_TX_BUF_SIZE]){/*WrapOUTpointer*/
3. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
4. }
5. (void)OSSemPost(pbuf->RingBufTxSem);/*Indicatethatcharacterwillbesent*/
6. *err=SCI_NO_ERR;
7. return(c);/*Charactersarestillavailable*/
8. }else{
9. *err=SCI_TX_EMPTY;
10. return(NUL);/*Bufferisempty*/
11. }
12. }

13. voidSCI0_ISR_Handler(void)
14. {
15. charstatus;
16. chardata;
17. unsignedcharerr;
19. status=SCI0SR1;

    if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag

20. {
21. //Seeifwehavesomekindoferror
22. //Clearinterrupt(donothingaboutit!)
23. data=SCI0DRL;
24. }
25. elseif(status&0x20)//ReceiveDataRegFullFlag
26. {
27. data=SCI0DRL;
28. SCIPutRxChar(SCI0,data);//Insertreceivedcharacterintobuffer
29. }
30. elseif(status&0x80)
31. {
32. data=SCIGetTxChar(SCI0,&err);//Getnextcharactertosend.
33. if(err==SCI_TX_EMPTY)
34. {//Dowehaveanymorecharacterstosend?
35. //No,DisableTxinterrupts
36. SCIDisTxInt(SCI0);
37. }
38. else
39. {
40. SCI0DRL=data;//Yes,Sendcharacter
41. }
42. }
43. }

44. voidSCI1_ISR_Handler(void)
45. {
46. charstatus;
47. chardata;
48. unsignedcharerr;
50. status=SCI1SR1;

    if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag

51. {
52. //Seeifwehavesomekindoferror
53. //Clearinterrupt(donothingaboutit!)
54. data=SCI1DRL;
55. }
56. elseif(status&0x20)//ReceiveDataRegFullFlag
57. {
58. data=SCI1DRL;
59. SCIPutRxChar(SCI1,data);//Insertreceivedcharacterintobuffer
60. }
61. elseif(status&0x80)
62. {
63. data=SCIGetTxChar(SCI1,&err);//Getnextcharactertosend.
64. if(err==SCI_TX_EMPTY)
65. {//Dowehaveanymorecharacterstosend?
66. //No,DisableTxinterrupts
67. SCIDisTxInt(SCI1);
68. }
69. else
70. {
71. SCI1DRL=data;//Yes,Sendcharacter
72. }
73. }
74. }

    #pragmaCODE_SEGNON_BANKED

75. interruptVectorNumber_Vsci0voidSCI0_ISR(void)
76. {

    #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

77. __asmldaaPPAGE;//3~,GetcurrentvalueofPPAGEregister
78. __asmpsha;//2~,PushPPAGEregisterontocurrenttasksstack
79. #endif
81. __asmincOSIntNesting;//OSIntNesting++;

    //if(OSIntNesting==1)

82. //{
83. //OSTCBCur->OSTCBStkPtr=StackPointer;
84. //}
85. __asm
86. {
87. ldabOSIntNesting
88. cmpb#$01
89. bneSCI0ISR1

    ldxOSTCBCur

90. sts0,x
91. SCI0ISR1:
92. }

    #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

93. __asmcallSCI0_ISR_Handler;
94. __asmcallOSIntExit;
95. #else
96. __asmjsrSCI0_ISR_Handler;
97. __asmjsrOSIntExit;
98. #endif

    #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

99. __asmpula;//3~,GetvalueofPPAGEregister
100. __asmstaaPPAGE;//3~,StoreintoCPUsPPAGEregister
101. #endif

     }

     interruptVectorNumber_Vsci1voidSCI1_ISR(void)

102. {

     #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

103. __asmldaaPPAGE;//3~,GetcurrentvalueofPPAGEregister
104. __asmpsha;//2~,PushPPAGEregisterontocurrenttasksstack
105. #endif
107. __asmincOSIntNesting;//OSIntNesting++;

     //if(OSIntNesting==1)

108. //{
109. //OSTCBCur->OSTCBStkPtr=StackPointer;
110. //}
111. __asm
112. {
113. ldabOSIntNesting
114. cmpb#$01
115. bneSCI1ISR1

     ldxOSTCBCur

116. sts0,x
117. SCI1ISR1:
118. }

     #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

119. __asmcallSCI1_ISR_Handler;
120. __asmcallOSIntExit;
121. #else
122. __asmjsrSCI1_ISR_Handler;
123. __asmjsrOSIntExit;
124. #endif

     #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)

125. __asmpula;//3~,GetvalueofPPAGEregister
126. __asmstaaPPAGE;//3~,StoreintoCPUsPPAGEregister
127. #endif

     }

下面给个简单的例子：

1. #include/*commondefinesandmacros*/

2. #include"derivative.h"/*derivative-specificdefinitions*/

   #include"INCLUDES.H"

3. #include"crg.h"
4. #include"sci.h"
5. #include"sci_rtos.h"

   OS_STKAppStartTaskStk[64];

   staticvoidAppStartTask(void*pdata);

   voidmain(void)

6. {
7. /*putyourowncodehere*/
8. OS_CPU_SRcpu_sr;

   CRGInit();

9. CRGSetRTIFreqency(0x54);//200Hz

   EnableInterrupts;

11. OS_ENTER_CRITICAL();
12. SCIInit(SCI0);
13. SCIInit(SCI1);
14. OS_EXIT_CRITICAL();
16. OSInit();
18. SCISetIEBit(SCI0,SCI_RIE);
19. SCISetIEBit(SCI1,SCI_RIE);
20. SCIBufferInit();
22. (void)OSTaskCreate(AppStartTask,(void*)0x4321,(void*)&AppStartTaskStk[63],0);
23. (void)OSStart();
25. for(;;)
26. {
27. _FEED_COP();/*feedsthedog*/
28. }/*loopforever*/
30. /*pleasemakesurethatyouneverleavemain*/
31. }

    staticvoidAppStartTask(void*pdata)

32. {
33. INT8Uerr;
34. charC;
35. (void)pdata;
36. for(;;)
37. {
38. C=SCIGetCharB