Freescale 9S12 系列单片机应用笔记（SCI）1

1. CI1
2. *@paramisEnable0disable1enable
3. */
4. voidSCIEnableRecv(unsignedcharport,unsignedcharisEnable);
6. /**
7. *Enable/DisableSCITransmitter
8. *@paramportportcanbeSCI0/SCI1
9. *@paramisEnable0disable1enable
10. */
11. voidSCIEnableTrans(unsignedcharport,unsignedcharisEnable);
13. /**
14. *SettheIdleLineType
15. *@paramportportcanbeSCI0/SCI1
16. *@paramtype0Idlecharbitcountbeginsafterstartbit
17. *1Idlecharbitcountbeginsafterstopbit
18. */
19. voidSCISetIdleLineType(unsignedcharport,unsignedchartype);
21. /**
22. *SettheWakeupCondition.
23. *@paramportportcanbeSCI0/SCI1
24. *@paramcondi0forIdlelinewakeup,1foraddressmarkwakeup
25. */
26. voidSCISetWakeupCondi(unsignedcharport,unsignedcharcondi);
28. /**
29. *Enable/DisableparityfunctionandsettheParitytype
30. *@paramportportcanbeSCI0/SCI1
31. *@paramisEnable0fordisableparityfunction,1forenable
32. *@paramtype0forEvenParity,1forOddParity
33. */
34. voidSCISetParity(unsignedcharport,unsignedcharisEnable,unsignedchartype);
36. /**
37. *SettheDataFormatModeBit
38. *@paramportportcanbeSCI0/SCI1
39. *@parambitsmustbe8or9
40. */
41. voidSCISetDataBit(unsignedcharport,unsignedcharbits);
43. /**
44. *Settheworkmodeofoperation
45. *@paramportportcanbeSCI0/SCI1
46. *@parammodemodecanbeNORMAL_MODE/LOOP_MODE/SING_WIRE_MODE
47. */
48. voidSCISetWorkMode(unsignedcharport,unsignedcharmode);
50. /**
51. *Enable/DisabletheSCIinwaitmode
52. *@paramportportcanbeSCI0/SCI1
53. *@parammodemodecanbeRUN_MODE/WAIT_MODE
54. */
55. voidSCISetPowerMode(unsignedcharport,unsignedcharmode);
57. /**
58. *SettheTXDIR(OnlyforSingleWireMODE)
59. *@paramportportcanbeSCI0/SCI1
60. *@paramdir0TXDusedasinput,1TXDusedasoutput
61. */
62. voidSCISetTXDIR(unsignedcharport,unsignedchardir);
64. /**
65. *SendacharthrounghSCImodule.
66. *@paramportportcanbeSCI0/SCI1
67. *@paramsthedatatobesent
68. */
69. voidSCIPutChar(unsignedcharport,unsignedchars);
71. /**
72. *ReceiveachardatafromSCImodule,noreply.
73. *@paramportportcanbeSCI0/SCI1
74. *@returnthereceivedchar
75. */
76. unsignedcharSCIGetChar(unsignedcharport);
78. /**
79. *Sendashortintvalue(BigEndian)throunghSCImodule.
80. *@paramportportcanbeSCI0/SCI1
81. *@paramithedatatobesent
82. */
83. voidSCIPutShortBigEndian(unsignedcharport,shorti);
85. /**
86. *Sendashortintvalue(LittleEndian)throunghSCImodule.
87. *@paramportportcanbeSCI0/SCI1
88. *@paramithedatatobesent
89. */
90. voidSCIPutShortLittleEndian(unsignedcharport,shorti);
92. /**
93. *Sendalongintvalue(BigEndian)throunghSCImodule.
94. *@paramportportcanbeSCI0/SCI1
95. *@paramithedatatobesent
96. */
97. voidSCIPutLongBigEndian(unsignedcharport,longi);
99. /**
100. *Sendalongintvalue(LittleEndian)throunghSCImodule.
101. *@paramportportcanbeSCI0/SCI1
102. *@paramithedatatobesent
103. */
104. voidSCIPutLongLittleEndian(unsignedcharport,longi);
106. /**
107. *SendacharstringthrounghSCImodule.
108. *@paramportportcanbeSCI0/SCI1
109. *@param*strthestringtobesent
110. */
111. voidSCIPutStr(unsignedcharport,unsignedchar*str);
114. /**
115. *SenddatathrounghSCImodule.
116. *@paramportportcanbeSCI0/SCI1
117. *@param*ppointertothedatatobesent
118. *@paramsizethesize(byte)ofthedata
119. */
120. voidSCIWrite(unsignedcharport,void*p,intsize);
122. #endif

下面给个简单的例子

1. #include/*commondefinesandmacros*/
2. #include"derivative.h"/*derivative-specificdefinitions*/
3. #include"sci.h"
5. voidmain(void)
6. {
7. charC;
8. EnableInterrupts;
10. SCISetWorkMode(SCI0,NORMAL_MODE);
11. SCISetPowerMode(SCI0,RUN_MODE);
12. SCISetBaudRate(SCI0,9600,16384000L);//16MClock
13. SCISetDataBit(SCI0,8);
14. SCISetParity(SCI0,0,0);
15. SCIEnableRecv(SCI0,1);
16. SCIEnableTrans(SCI0,1);
18. for(;;)
19. {
20. _FEED_COP();/*feedsthedog*/
21. C=SCIGetChar(SCI0);
22. SCIPutChar(SCI0,C);
23. }/*loopforever*/
25. /*pleasemakesurethatyouneverleavemain*/
26. }

先写这么多，剩下的明天继续。下一篇笔记中将给出如何利用串口的收发中断和环形缓冲区来实现较为完善的串口驱动。