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STM32F10x 学习笔记6（USART实现串口通讯 2）

时间：11-20 来源：互联网 点击：

  1. _EMPTY;
  2. c=0;/*Bufferisempty,return0*/
  3. return(c);
  4. }
  5. }
  8. /************************************************************
  9. *function:COMPutCharB
  10. *parameter:charport,portcanbeCOM1/COM2
  11. *return:COMM_NO_ERRifthefunctionwassuccessful(thebufferwasnotfull)
  12. *COMM_TX_FULLifthebufferwasfull
  13. *COMM_BAD_CHifyouhavespecifiedanincorrectchannel
  15. *usage:Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
  16. *channel.ThecharactertosendisfirstinsertedintotheTxbufferandwillbesentby
  17. *theTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISRwillbe
  18. *enabled.IftheTxbufferisfull,thecharacterwillnotbesent(i.e.itwillbelost)
  19. *changelog:
  20. *1.firstimplimentedbyliyuan2010.11.5
  21. *************************************************************/
  22. unsignedcharCOMPutCharB(unsignedcharport,unsignedcharc)
  23. {
  24. //unsignedcharcpu_sr;
  26. COM_RING_BUF*pbuf;
  27. switch(port)
  28. {/*Obtainpointertocommunicationschannel*/
  29. caseCOM1:
  30. pbuf=&COM1Buf;
  31. break;
  33. caseCOM2:
  34. pbuf=&COM2Buf;
  35. break;
  37. default:
  38. return(COM_BAD_CH);
  39. }
  41. OS_ENTER_CRITICAL();
  42. if(pbuf->RingBufTxCtr
  43. pbuf->RingBufTxCtr++;/*No,incrementcharactercount*/
  44. *pbuf->RingBufTxInPtr++=c;/*Putcharacterintobuffer*/
  45. if(pbuf->RingBufTxInPtr==&pbuf->RingBufTx[COM_TX_BUF_SIZE]){/*WrapINpointer*/
  46. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
  47. }
  48. if(pbuf->RingBufTxCtr==1){/*Seeifthisisthefirstcharacter*/
  49. COMEnableTxInt(port);/*Yes,EnableTxinterrupts*/
  50. OS_EXIT_CRITICAL();
  51. }else{
  52. OS_EXIT_CRITICAL();
  53. }
  54. return(COM_NO_ERR);
  55. }else{
  56. OS_EXIT_CRITICAL();
  57. return(COM_TX_FULL);
  58. }
  59. }
  61. /************************************************************
  62. *function:COMBufferInit
  63. *parameter:
  64. *return:
  65. *usage:Thisfunctioniscalledbyyourapplicationtoinitializethecommunicationsmodule.You
  66. *mustcallthisfunctionbeforecallinganyotherfunctions.
  67. *changelog:
  68. *************************************************************/
  69. voidCOMBufferInit(void)
  70. {
  71. COM_RING_BUF*pbuf;
  73. pbuf=&COM1Buf;/*InitializetheringbufferforCOM0*/
  74. pbuf->RingBufRxCtr=0;
  75. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
  76. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
  77. pbuf->RingBufTxCtr=0;
  78. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
  79. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
  81. pbuf=&COM2Buf;/*InitializetheringbufferforCOM1*/
  82. pbuf->RingBufRxCtr=0;
  83. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
  84. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
  85. pbuf->RingBufTxCtr=0;
  86. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
  87. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
  88. }
  90. /************************************************************
  91. *function:COMBufferIsEmpty
  92. *parameter:charport,portcanbeCOM1/COM2
  93. *return:char
  94. *usage:Thisfunctioniscalledbyyourapplicationtosee
  95. *ifanycharacterisavailablefromthecommunicationschannel.
  96. *Ifatleastonecharacterisavailable,thefunctionreturns
  97. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
  98. *changelog:
  99. *************************************************************/
  100. unsignedcharCOMBufferIsEmpty(unsignedcharport)
  101. {
  102. //unsignedcharcpu_sr;
  104. unsignedcharempty;
  105. COM_RING_BUF*pbuf;
  106. switch(port)
  107. {/*Obtainpointertocommunicationschannel*/
  108. caseCOM1:
  109. pbuf=&COM1Buf;
  110. break;
  112. caseCOM2:
  113. pbuf=&COM2Buf;
  114. break;
  116. default:
  117. return(1);
  118. }
  119. OS_ENTER_CRITICAL();
  120. if(pbuf->RingBufRxCtr>0)
  121. {/*Seeifbufferisempty*/
  122. empty=0;/*BufferisNOTempty*/
  123. }
  124. else
  125. {
  126. empty=1;/*Bufferisempty*/
  127. }
  128. OS_EXIT_CRITICAL();
  129. return(empty);
  130. }
  133. /************************************************************
  134. *function:COMBufferIsFull
  135. *parameter:charport,portcanbeCOM1/COM2
  136. *return:char
  137. *usage:Thisfunctioniscalledbyyourapplicationtoseeifanymorecharacterscanbeplaced
  138. *intheTxbuffer.Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
  139. *Ifthebufferisfull,thefunctionreturnsTRUEotherwise,thefunctionreturnsFALSE.
  140. *changelog:
  141. *************************************************************/
  142. unsignedcharCOMBufferIsFull(unsignedcharport)
  143. {
  144. //unsignedcharcpu_sr;

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